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 | |
8696b40b JR |
100 | stream = consumer_stream_create(channel, channel->key, key, channel->name, |
101 | channel->relayd_id, channel->session_id, channel->trace_chunk, cpu, | |
102 | &alloc_ret, channel->type, channel->monitor, channel->trace_format); | |
ffe60014 DG |
103 | if (stream == NULL) { |
104 | switch (alloc_ret) { | |
105 | case -ENOENT: | |
106 | /* | |
107 | * We could not find the channel. Can happen if cpu hotplug | |
108 | * happens while tearing down. | |
109 | */ | |
110 | DBG3("Could not find channel"); | |
111 | break; | |
112 | case -ENOMEM: | |
113 | case -EINVAL: | |
114 | default: | |
115 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
116 | break; | |
117 | } | |
118 | goto error; | |
119 | } | |
120 | ||
d9a2e16e | 121 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
122 | |
123 | error: | |
124 | if (_alloc_ret) { | |
125 | *_alloc_ret = alloc_ret; | |
126 | } | |
127 | return stream; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Send the given stream pointer to the corresponding thread. | |
132 | * | |
133 | * Returns 0 on success else a negative value. | |
134 | */ | |
135 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
136 | struct lttng_consumer_local_data *ctx) | |
137 | { | |
dae10966 DG |
138 | int ret; |
139 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
140 | |
141 | /* Get the right pipe where the stream will be sent. */ | |
142 | if (stream->metadata_flag) { | |
66d583dc | 143 | consumer_add_metadata_stream(stream); |
dae10966 | 144 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 145 | } else { |
66d583dc | 146 | consumer_add_data_stream(stream); |
dae10966 | 147 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
148 | } |
149 | ||
5ab66908 MD |
150 | /* |
151 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
152 | * the channel and it becomes globally visible. Hence, remove it from |
153 | * the local stream list to prevent the stream from being both local and | |
154 | * global. | |
5ab66908 MD |
155 | */ |
156 | stream->globally_visible = 1; | |
5c5e3d71 | 157 | cds_list_del_init(&stream->send_node); |
5ab66908 | 158 | |
dae10966 | 159 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 160 | if (ret < 0) { |
dae10966 DG |
161 | ERR("Consumer write %s stream to pipe %d", |
162 | stream->metadata_flag ? "metadata" : "data", | |
163 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
164 | if (stream->metadata_flag) { |
165 | consumer_del_stream_for_metadata(stream); | |
166 | } else { | |
167 | consumer_del_stream_for_data(stream); | |
168 | } | |
a8086cf4 | 169 | goto error; |
ffe60014 | 170 | } |
a8086cf4 | 171 | |
5ab66908 | 172 | error: |
ffe60014 DG |
173 | return ret; |
174 | } | |
175 | ||
4628484a MD |
176 | static |
177 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
178 | { | |
45863397 | 179 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
180 | int ret; |
181 | ||
182 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
183 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 184 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
185 | if (ret < 0) { |
186 | PERROR("snprintf"); | |
4628484a MD |
187 | goto end; |
188 | } | |
189 | strncat(stream_shm_path, cpu_nr, | |
190 | PATH_MAX - strlen(stream_shm_path) - 1); | |
191 | ret = 0; | |
192 | end: | |
193 | return ret; | |
194 | } | |
195 | ||
d88aee68 DG |
196 | /* |
197 | * Create streams for the given channel using liblttng-ust-ctl. | |
d2956687 | 198 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
199 | * |
200 | * Return 0 on success else a negative value. | |
201 | */ | |
ffe60014 | 202 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
d2956687 | 203 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
204 | { |
205 | int ret, cpu = 0; | |
b623cb6a | 206 | struct lttng_ust_ctl_consumer_stream *ustream; |
ffe60014 | 207 | struct lttng_consumer_stream *stream; |
d2956687 | 208 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 | 209 | |
a0377dfe FD |
210 | LTTNG_ASSERT(channel); |
211 | LTTNG_ASSERT(ctx); | |
ffe60014 DG |
212 | |
213 | /* | |
214 | * While a stream is available from ustctl. When NULL is returned, we've | |
215 | * reached the end of the possible stream for the channel. | |
216 | */ | |
b623cb6a | 217 | while ((ustream = lttng_ust_ctl_create_stream(channel->uchan, cpu))) { |
ffe60014 | 218 | int wait_fd; |
04ef1097 | 219 | int ust_metadata_pipe[2]; |
ffe60014 | 220 | |
9ce5646a MD |
221 | health_code_update(); |
222 | ||
04ef1097 MD |
223 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
224 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
225 | if (ret < 0) { | |
226 | ERR("Create ust metadata poll pipe"); | |
227 | goto error; | |
228 | } | |
229 | wait_fd = ust_metadata_pipe[0]; | |
230 | } else { | |
b623cb6a | 231 | wait_fd = lttng_ust_ctl_stream_get_wait_fd(ustream); |
04ef1097 | 232 | } |
ffe60014 DG |
233 | |
234 | /* Allocate consumer stream object. */ | |
d2956687 | 235 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
236 | if (!stream) { |
237 | goto error_alloc; | |
238 | } | |
239 | stream->ustream = ustream; | |
240 | /* | |
241 | * Store it so we can save multiple function calls afterwards since | |
242 | * this value is used heavily in the stream threads. This is UST | |
243 | * specific so this is why it's done after allocation. | |
244 | */ | |
245 | stream->wait_fd = wait_fd; | |
246 | ||
b31398bb DG |
247 | /* |
248 | * Increment channel refcount since the channel reference has now been | |
249 | * assigned in the allocation process above. | |
250 | */ | |
10a50311 JD |
251 | if (stream->chan->monitor) { |
252 | uatomic_inc(&stream->chan->refcount); | |
253 | } | |
b31398bb | 254 | |
d2956687 JG |
255 | pthread_mutex_lock(&stream->lock); |
256 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
257 | /* |
258 | * Order is important this is why a list is used. On error, the caller | |
259 | * should clean this list. | |
260 | */ | |
261 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
262 | ||
b623cb6a | 263 | ret = lttng_ust_ctl_get_max_subbuf_size(stream->ustream, |
ffe60014 DG |
264 | &stream->max_sb_size); |
265 | if (ret < 0) { | |
b623cb6a | 266 | ERR("lttng_ust_ctl_get_max_subbuf_size failed for stream %s", |
ffe60014 DG |
267 | stream->name); |
268 | goto error; | |
269 | } | |
270 | ||
271 | /* Do actions once stream has been received. */ | |
272 | if (ctx->on_recv_stream) { | |
273 | ret = ctx->on_recv_stream(stream); | |
274 | if (ret < 0) { | |
275 | goto error; | |
276 | } | |
277 | } | |
278 | ||
d88aee68 | 279 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
280 | stream->name, stream->key, stream->relayd_stream_id); |
281 | ||
282 | /* Set next CPU stream. */ | |
283 | channel->streams.count = ++cpu; | |
d88aee68 DG |
284 | |
285 | /* Keep stream reference when creating metadata. */ | |
286 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
287 | channel->metadata_stream = stream; | |
8de4f941 JG |
288 | if (channel->monitor) { |
289 | /* Set metadata poll pipe if we created one */ | |
290 | memcpy(stream->ust_metadata_poll_pipe, | |
291 | ust_metadata_pipe, | |
292 | sizeof(ust_metadata_pipe)); | |
293 | } | |
d88aee68 | 294 | } |
d2956687 JG |
295 | pthread_mutex_unlock(&stream->lock); |
296 | current_stream_lock = NULL; | |
ffe60014 DG |
297 | } |
298 | ||
299 | return 0; | |
300 | ||
301 | error: | |
302 | error_alloc: | |
d2956687 JG |
303 | if (current_stream_lock) { |
304 | pthread_mutex_unlock(current_stream_lock); | |
305 | } | |
ffe60014 DG |
306 | return ret; |
307 | } | |
308 | ||
d2956687 JG |
309 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
310 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
311 | { |
312 | char shm_path[PATH_MAX]; | |
313 | int ret; | |
314 | ||
315 | if (!channel->shm_path[0]) { | |
b7fc068d | 316 | return shm_create_anonymous("ust-consumer"); |
4628484a MD |
317 | } |
318 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
319 | if (ret) { | |
320 | goto error_shm_path; | |
321 | } | |
322 | return run_as_open(shm_path, | |
323 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
ff588497 JR |
324 | lttng_credentials_get_uid(session_credentials), |
325 | lttng_credentials_get_gid(session_credentials)); | |
4628484a MD |
326 | |
327 | error_shm_path: | |
328 | return -1; | |
329 | } | |
330 | ||
ffe60014 DG |
331 | /* |
332 | * Create an UST channel with the given attributes and send it to the session | |
333 | * daemon using the ust ctl API. | |
334 | * | |
335 | * Return 0 on success or else a negative value. | |
336 | */ | |
4628484a | 337 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
b623cb6a MJ |
338 | struct lttng_ust_ctl_consumer_channel_attr *attr, |
339 | struct lttng_ust_ctl_consumer_channel **ust_chanp) | |
ffe60014 | 340 | { |
4628484a MD |
341 | int ret, nr_stream_fds, i, j; |
342 | int *stream_fds; | |
b623cb6a | 343 | struct lttng_ust_ctl_consumer_channel *ust_channel; |
ffe60014 | 344 | |
a0377dfe FD |
345 | LTTNG_ASSERT(channel); |
346 | LTTNG_ASSERT(attr); | |
347 | LTTNG_ASSERT(ust_chanp); | |
348 | LTTNG_ASSERT(channel->buffer_credentials.is_set); | |
ffe60014 DG |
349 | |
350 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
351 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
352 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
353 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
354 | attr->num_subbuf, attr->switch_timer_interval, | |
355 | attr->read_timer_interval, attr->output, attr->type); | |
356 | ||
4628484a MD |
357 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
358 | nr_stream_fds = 1; | |
359 | else | |
b623cb6a | 360 | nr_stream_fds = lttng_ust_ctl_get_nr_stream_per_channel(); |
64803277 | 361 | stream_fds = calloc<int>(nr_stream_fds); |
4628484a MD |
362 | if (!stream_fds) { |
363 | ret = -1; | |
364 | goto error_alloc; | |
365 | } | |
366 | for (i = 0; i < nr_stream_fds; i++) { | |
d2956687 JG |
367 | stream_fds[i] = open_ust_stream_fd(channel, i, |
368 | &channel->buffer_credentials.value); | |
4628484a MD |
369 | if (stream_fds[i] < 0) { |
370 | ret = -1; | |
371 | goto error_open; | |
372 | } | |
373 | } | |
b623cb6a | 374 | ust_channel = lttng_ust_ctl_create_channel(attr, stream_fds, nr_stream_fds); |
4628484a | 375 | if (!ust_channel) { |
ffe60014 DG |
376 | ret = -1; |
377 | goto error_create; | |
378 | } | |
4628484a MD |
379 | channel->nr_stream_fds = nr_stream_fds; |
380 | channel->stream_fds = stream_fds; | |
381 | *ust_chanp = ust_channel; | |
ffe60014 DG |
382 | |
383 | return 0; | |
384 | ||
385 | error_create: | |
4628484a MD |
386 | error_open: |
387 | for (j = i - 1; j >= 0; j--) { | |
388 | int closeret; | |
389 | ||
390 | closeret = close(stream_fds[j]); | |
391 | if (closeret) { | |
392 | PERROR("close"); | |
393 | } | |
394 | if (channel->shm_path[0]) { | |
395 | char shm_path[PATH_MAX]; | |
396 | ||
397 | closeret = get_stream_shm_path(shm_path, | |
398 | channel->shm_path, j); | |
399 | if (closeret) { | |
400 | ERR("Cannot get stream shm path"); | |
401 | } | |
402 | closeret = run_as_unlink(shm_path, | |
ff588497 JR |
403 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
404 | channel->buffer_credentials)), | |
405 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
406 | channel->buffer_credentials))); | |
4628484a | 407 | if (closeret) { |
4628484a MD |
408 | PERROR("unlink %s", shm_path); |
409 | } | |
410 | } | |
411 | } | |
412 | /* Try to rmdir all directories under shm_path root. */ | |
413 | if (channel->root_shm_path[0]) { | |
602766ec | 414 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
ff588497 JR |
415 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
416 | channel->buffer_credentials)), | |
417 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
418 | channel->buffer_credentials)), | |
f75c5439 | 419 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
4628484a MD |
420 | } |
421 | free(stream_fds); | |
422 | error_alloc: | |
ffe60014 DG |
423 | return ret; |
424 | } | |
425 | ||
d88aee68 DG |
426 | /* |
427 | * Send a single given stream to the session daemon using the sock. | |
428 | * | |
429 | * Return 0 on success else a negative value. | |
430 | */ | |
ffe60014 DG |
431 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
432 | { | |
433 | int ret; | |
434 | ||
a0377dfe FD |
435 | LTTNG_ASSERT(stream); |
436 | LTTNG_ASSERT(sock >= 0); | |
ffe60014 | 437 | |
3eb914c0 | 438 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
439 | |
440 | /* Send stream to session daemon. */ | |
b623cb6a | 441 | ret = lttng_ust_ctl_send_stream_to_sessiond(sock, stream->ustream); |
ffe60014 DG |
442 | if (ret < 0) { |
443 | goto error; | |
444 | } | |
445 | ||
ffe60014 DG |
446 | error: |
447 | return ret; | |
448 | } | |
449 | ||
450 | /* | |
a3a86f35 | 451 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 452 | * |
d88aee68 | 453 | * Return 0 on success or else a negative value. |
ffe60014 | 454 | */ |
a3a86f35 | 455 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
456 | struct lttng_consumer_channel *channel, |
457 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
458 | { | |
0c759fc9 | 459 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 460 | struct lttng_consumer_stream *stream; |
a4baae1b | 461 | uint64_t net_seq_idx = -1ULL; |
ffe60014 | 462 | |
a0377dfe FD |
463 | LTTNG_ASSERT(channel); |
464 | LTTNG_ASSERT(ctx); | |
465 | LTTNG_ASSERT(sock >= 0); | |
ffe60014 DG |
466 | |
467 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
468 | ||
62285ea4 DG |
469 | if (channel->relayd_id != (uint64_t) -1ULL) { |
470 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
471 | |
472 | health_code_update(); | |
473 | ||
62285ea4 | 474 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
475 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
476 | stream->key, channel->name); | |
62285ea4 DG |
477 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
478 | if (ret < 0) { | |
479 | /* | |
480 | * Flag that the relayd was the problem here probably due to a | |
481 | * communicaton error on the socket. | |
482 | */ | |
483 | if (relayd_error) { | |
484 | *relayd_error = 1; | |
485 | } | |
725d28b2 | 486 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 487 | } |
a4baae1b JD |
488 | if (net_seq_idx == -1ULL) { |
489 | net_seq_idx = stream->net_seq_idx; | |
490 | } | |
491 | } | |
f2a444f1 | 492 | } |
ffe60014 | 493 | |
f2a444f1 DG |
494 | /* Inform sessiond that we are about to send channel and streams. */ |
495 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 496 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
497 | /* |
498 | * Either the session daemon is not responding or the relayd died so we | |
499 | * stop now. | |
500 | */ | |
501 | goto error; | |
502 | } | |
503 | ||
504 | /* Send channel to sessiond. */ | |
b623cb6a | 505 | ret = lttng_ust_ctl_send_channel_to_sessiond(sock, channel->uchan); |
f2a444f1 DG |
506 | if (ret < 0) { |
507 | goto error; | |
508 | } | |
509 | ||
b623cb6a | 510 | ret = lttng_ust_ctl_channel_close_wakeup_fd(channel->uchan); |
f2a444f1 DG |
511 | if (ret < 0) { |
512 | goto error; | |
513 | } | |
514 | ||
515 | /* The channel was sent successfully to the sessiond at this point. */ | |
516 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
517 | |
518 | health_code_update(); | |
519 | ||
ffe60014 DG |
520 | /* Send stream to session daemon. */ |
521 | ret = send_sessiond_stream(sock, stream); | |
522 | if (ret < 0) { | |
523 | goto error; | |
524 | } | |
525 | } | |
526 | ||
527 | /* Tell sessiond there is no more stream. */ | |
b623cb6a | 528 | ret = lttng_ust_ctl_send_stream_to_sessiond(sock, NULL); |
ffe60014 DG |
529 | if (ret < 0) { |
530 | goto error; | |
531 | } | |
532 | ||
533 | DBG("UST consumer NULL stream sent to sessiond"); | |
534 | ||
535 | return 0; | |
536 | ||
537 | error: | |
0c759fc9 | 538 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
539 | ret = -1; |
540 | } | |
ffe60014 DG |
541 | return ret; |
542 | } | |
543 | ||
544 | /* | |
545 | * Creates a channel and streams and add the channel it to the channel internal | |
546 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
547 | * received. | |
548 | * | |
549 | * Return 0 on success or else, a negative value is returned and the channel | |
550 | * MUST be destroyed by consumer_del_channel(). | |
551 | */ | |
75cfe9e6 | 552 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 553 | struct lttng_consumer_channel *channel, |
b623cb6a | 554 | struct lttng_ust_ctl_consumer_channel_attr *attr) |
3bd1e081 MD |
555 | { |
556 | int ret; | |
557 | ||
a0377dfe FD |
558 | LTTNG_ASSERT(ctx); |
559 | LTTNG_ASSERT(channel); | |
560 | LTTNG_ASSERT(attr); | |
ffe60014 DG |
561 | |
562 | /* | |
563 | * This value is still used by the kernel consumer since for the kernel, | |
564 | * the stream ownership is not IN the consumer so we need to have the | |
565 | * number of left stream that needs to be initialized so we can know when | |
566 | * to delete the channel (see consumer.c). | |
567 | * | |
568 | * As for the user space tracer now, the consumer creates and sends the | |
569 | * stream to the session daemon which only sends them to the application | |
570 | * once every stream of a channel is received making this value useless | |
571 | * because we they will be added to the poll thread before the application | |
572 | * receives them. This ensures that a stream can not hang up during | |
573 | * initilization of a channel. | |
574 | */ | |
575 | channel->nb_init_stream_left = 0; | |
576 | ||
577 | /* The reply msg status is handled in the following call. */ | |
4628484a | 578 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 579 | if (ret < 0) { |
10a50311 | 580 | goto end; |
3bd1e081 MD |
581 | } |
582 | ||
b623cb6a | 583 | channel->wait_fd = lttng_ust_ctl_channel_get_wait_fd(channel->uchan); |
d8ef542d | 584 | |
10a50311 JD |
585 | /* |
586 | * For the snapshots (no monitor), we create the metadata streams | |
587 | * on demand, not during the channel creation. | |
588 | */ | |
589 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
590 | ret = 0; | |
591 | goto end; | |
592 | } | |
593 | ||
ffe60014 | 594 | /* Open all streams for this channel. */ |
d2956687 JG |
595 | pthread_mutex_lock(&channel->lock); |
596 | ret = create_ust_streams(channel, ctx); | |
597 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 598 | if (ret < 0) { |
10a50311 | 599 | goto end; |
ffe60014 DG |
600 | } |
601 | ||
10a50311 | 602 | end: |
3bd1e081 MD |
603 | return ret; |
604 | } | |
605 | ||
d88aee68 DG |
606 | /* |
607 | * Send all stream of a channel to the right thread handling it. | |
608 | * | |
609 | * On error, return a negative value else 0 on success. | |
610 | */ | |
611 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
612 | struct lttng_consumer_local_data *ctx) | |
613 | { | |
614 | int ret = 0; | |
615 | struct lttng_consumer_stream *stream, *stmp; | |
616 | ||
a0377dfe FD |
617 | LTTNG_ASSERT(channel); |
618 | LTTNG_ASSERT(ctx); | |
d88aee68 DG |
619 | |
620 | /* Send streams to the corresponding thread. */ | |
621 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
622 | send_node) { | |
9ce5646a MD |
623 | |
624 | health_code_update(); | |
625 | ||
d88aee68 DG |
626 | /* Sending the stream to the thread. */ |
627 | ret = send_stream_to_thread(stream, ctx); | |
628 | if (ret < 0) { | |
629 | /* | |
630 | * If we are unable to send the stream to the thread, there is | |
631 | * a big problem so just stop everything. | |
632 | */ | |
633 | goto error; | |
634 | } | |
d88aee68 DG |
635 | } |
636 | ||
637 | error: | |
638 | return ret; | |
639 | } | |
640 | ||
7972aab2 DG |
641 | /* |
642 | * Flush channel's streams using the given key to retrieve the channel. | |
643 | * | |
644 | * Return 0 on success else an LTTng error code. | |
645 | */ | |
646 | static int flush_channel(uint64_t chan_key) | |
647 | { | |
648 | int ret = 0; | |
649 | struct lttng_consumer_channel *channel; | |
650 | struct lttng_consumer_stream *stream; | |
651 | struct lttng_ht *ht; | |
652 | struct lttng_ht_iter iter; | |
653 | ||
8fd623e0 | 654 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 655 | |
a500c257 | 656 | rcu_read_lock(); |
7972aab2 DG |
657 | channel = consumer_find_channel(chan_key); |
658 | if (!channel) { | |
8fd623e0 | 659 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
660 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
661 | goto error; | |
662 | } | |
663 | ||
fa29bfbf | 664 | ht = the_consumer_data.stream_per_chan_id_ht; |
7972aab2 DG |
665 | |
666 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
667 | cds_lfht_for_each_entry_duplicate(ht->ht, |
668 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
669 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
670 | |
671 | health_code_update(); | |
672 | ||
0dd01979 | 673 | pthread_mutex_lock(&stream->lock); |
5cfcab67 JR |
674 | |
675 | /* | |
676 | * Protect against concurrent teardown of a stream. | |
677 | */ | |
678 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
679 | goto next; | |
680 | } | |
681 | ||
0dd01979 | 682 | if (!stream->quiescent) { |
881fc67f MD |
683 | ret = lttng_ust_ctl_flush_buffer(stream->ustream, 0); |
684 | if (ret) { | |
685 | ERR("Failed to flush buffer while flushing channel: channel key = %" PRIu64 ", channel name = '%s'", | |
686 | chan_key, channel->name); | |
687 | ret = LTTNG_ERR_BUFFER_FLUSH_FAILED; | |
688 | pthread_mutex_unlock(&stream->lock); | |
689 | goto error; | |
690 | } | |
0dd01979 MD |
691 | stream->quiescent = true; |
692 | } | |
5cfcab67 | 693 | next: |
0dd01979 MD |
694 | pthread_mutex_unlock(&stream->lock); |
695 | } | |
9cc4ae91 JG |
696 | |
697 | /* | |
698 | * Send one last buffer statistics update to the session daemon. This | |
699 | * ensures that the session daemon gets at least one statistics update | |
700 | * per channel even in the case of short-lived channels, such as when a | |
701 | * short-lived app is traced in per-pid mode. | |
702 | */ | |
703 | sample_and_send_channel_buffer_stats(channel); | |
0dd01979 MD |
704 | error: |
705 | rcu_read_unlock(); | |
706 | return ret; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Clear quiescent state from channel's streams using the given key to | |
711 | * retrieve the channel. | |
712 | * | |
713 | * Return 0 on success else an LTTng error code. | |
714 | */ | |
715 | static int clear_quiescent_channel(uint64_t chan_key) | |
716 | { | |
717 | int ret = 0; | |
718 | struct lttng_consumer_channel *channel; | |
719 | struct lttng_consumer_stream *stream; | |
720 | struct lttng_ht *ht; | |
721 | struct lttng_ht_iter iter; | |
722 | ||
723 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
724 | ||
725 | rcu_read_lock(); | |
726 | channel = consumer_find_channel(chan_key); | |
727 | if (!channel) { | |
728 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
729 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
730 | goto error; | |
731 | } | |
732 | ||
fa29bfbf | 733 | ht = the_consumer_data.stream_per_chan_id_ht; |
0dd01979 MD |
734 | |
735 | /* For each stream of the channel id, clear quiescent state. */ | |
736 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
737 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
738 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
739 | ||
740 | health_code_update(); | |
741 | ||
742 | pthread_mutex_lock(&stream->lock); | |
743 | stream->quiescent = false; | |
744 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 745 | } |
7972aab2 | 746 | error: |
a500c257 | 747 | rcu_read_unlock(); |
7972aab2 DG |
748 | return ret; |
749 | } | |
750 | ||
d88aee68 DG |
751 | /* |
752 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
753 | * | |
754 | * Return 0 on success else an LTTng error code. | |
755 | */ | |
756 | static int close_metadata(uint64_t chan_key) | |
757 | { | |
ea88ca2a | 758 | int ret = 0; |
d88aee68 | 759 | struct lttng_consumer_channel *channel; |
f65a74be | 760 | unsigned int channel_monitor; |
d88aee68 | 761 | |
8fd623e0 | 762 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
763 | |
764 | channel = consumer_find_channel(chan_key); | |
765 | if (!channel) { | |
84cc9aa0 DG |
766 | /* |
767 | * This is possible if the metadata thread has issue a delete because | |
768 | * the endpoint point of the stream hung up. There is no way the | |
769 | * session daemon can know about it thus use a DBG instead of an actual | |
770 | * error. | |
771 | */ | |
772 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
773 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
774 | goto error; | |
775 | } | |
776 | ||
fa29bfbf | 777 | pthread_mutex_lock(&the_consumer_data.lock); |
a9838785 | 778 | pthread_mutex_lock(&channel->lock); |
f65a74be | 779 | channel_monitor = channel->monitor; |
73811ecc DG |
780 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
781 | goto error_unlock; | |
782 | } | |
783 | ||
6d574024 | 784 | lttng_ustconsumer_close_metadata(channel); |
f65a74be | 785 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 786 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 | 787 | |
f65a74be JG |
788 | /* |
789 | * The ownership of a metadata channel depends on the type of | |
790 | * session to which it belongs. In effect, the monitor flag is checked | |
791 | * to determine if this metadata channel is in "snapshot" mode or not. | |
792 | * | |
793 | * In the non-snapshot case, the metadata channel is created along with | |
794 | * a single stream which will remain present until the metadata channel | |
795 | * is destroyed (on the destruction of its session). In this case, the | |
796 | * metadata stream in "monitored" by the metadata poll thread and holds | |
797 | * the ownership of its channel. | |
798 | * | |
799 | * Closing the metadata will cause the metadata stream's "metadata poll | |
800 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
801 | * thread which will teardown the metadata stream which, in return, | |
802 | * deletes the metadata channel. | |
803 | * | |
804 | * In the snapshot case, the metadata stream is created and destroyed | |
805 | * on every snapshot record. Since the channel doesn't have an owner | |
806 | * other than the session daemon, it is safe to destroy it immediately | |
807 | * on reception of the CLOSE_METADATA command. | |
808 | */ | |
809 | if (!channel_monitor) { | |
810 | /* | |
811 | * The channel and consumer_data locks must be | |
812 | * released before this call since consumer_del_channel | |
813 | * re-acquires the channel and consumer_data locks to teardown | |
814 | * the channel and queue its reclamation by the "call_rcu" | |
815 | * worker thread. | |
816 | */ | |
817 | consumer_del_channel(channel); | |
818 | } | |
819 | ||
820 | return ret; | |
ea88ca2a | 821 | error_unlock: |
a9838785 | 822 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 823 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 DG |
824 | error: |
825 | return ret; | |
826 | } | |
827 | ||
828 | /* | |
829 | * RCU read side lock MUST be acquired before calling this function. | |
830 | * | |
831 | * Return 0 on success else an LTTng error code. | |
832 | */ | |
833 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
834 | { | |
835 | int ret; | |
836 | struct lttng_consumer_channel *metadata; | |
837 | ||
48b7cdc2 FD |
838 | ASSERT_RCU_READ_LOCKED(); |
839 | ||
8fd623e0 | 840 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
841 | |
842 | metadata = consumer_find_channel(key); | |
843 | if (!metadata) { | |
844 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
845 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
846 | goto end; |
847 | } | |
848 | ||
849 | /* | |
850 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
851 | * ownership transfer to the metadata thread. | |
852 | */ | |
853 | if (!metadata->monitor) { | |
854 | DBG("Metadata channel in no monitor"); | |
855 | ret = 0; | |
856 | goto end; | |
d88aee68 DG |
857 | } |
858 | ||
859 | /* | |
860 | * Send metadata stream to relayd if one available. Availability is | |
861 | * known if the stream is still in the list of the channel. | |
862 | */ | |
863 | if (cds_list_empty(&metadata->streams.head)) { | |
864 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
865 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 866 | goto error_no_stream; |
d88aee68 DG |
867 | } |
868 | ||
869 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
870 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
871 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
872 | metadata->pathname); | |
873 | if (ret < 0) { | |
874 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
875 | goto error; | |
876 | } | |
601262d6 JD |
877 | ret = consumer_send_relayd_streams_sent( |
878 | metadata->metadata_stream->net_seq_idx); | |
879 | if (ret < 0) { | |
880 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
881 | goto error; | |
882 | } | |
d88aee68 DG |
883 | } |
884 | ||
a8086cf4 JR |
885 | /* |
886 | * Ownership of metadata stream is passed along. Freeing is handled by | |
887 | * the callee. | |
888 | */ | |
d88aee68 DG |
889 | ret = send_streams_to_thread(metadata, ctx); |
890 | if (ret < 0) { | |
891 | /* | |
892 | * If we are unable to send the stream to the thread, there is | |
893 | * a big problem so just stop everything. | |
894 | */ | |
895 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 896 | goto send_streams_error; |
d88aee68 DG |
897 | } |
898 | /* List MUST be empty after or else it could be reused. */ | |
a0377dfe | 899 | LTTNG_ASSERT(cds_list_empty(&metadata->streams.head)); |
d88aee68 | 900 | |
10a50311 JD |
901 | ret = 0; |
902 | goto end; | |
d88aee68 DG |
903 | |
904 | error: | |
f2a444f1 DG |
905 | /* |
906 | * Delete metadata channel on error. At this point, the metadata stream can | |
907 | * NOT be monitored by the metadata thread thus having the guarantee that | |
908 | * the stream is still in the local stream list of the channel. This call | |
909 | * will make sure to clean that list. | |
910 | */ | |
f5a0c9cf | 911 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 | 912 | metadata->metadata_stream = NULL; |
a8086cf4 | 913 | send_streams_error: |
f5a0c9cf | 914 | error_no_stream: |
10a50311 JD |
915 | end: |
916 | return ret; | |
917 | } | |
918 | ||
919 | /* | |
920 | * Snapshot the whole metadata. | |
d2956687 | 921 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
922 | * |
923 | * Returns 0 on success, < 0 on error | |
924 | */ | |
3eb928aa MD |
925 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
926 | uint64_t key, char *path, uint64_t relayd_id, | |
d2956687 | 927 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
928 | { |
929 | int ret = 0; | |
10a50311 JD |
930 | struct lttng_consumer_stream *metadata_stream; |
931 | ||
a0377dfe FD |
932 | LTTNG_ASSERT(path); |
933 | LTTNG_ASSERT(ctx); | |
48b7cdc2 | 934 | ASSERT_RCU_READ_LOCKED(); |
10a50311 JD |
935 | |
936 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
937 | key, path); | |
938 | ||
939 | rcu_read_lock(); | |
940 | ||
a0377dfe | 941 | LTTNG_ASSERT(!metadata_channel->monitor); |
10a50311 | 942 | |
9ce5646a MD |
943 | health_code_update(); |
944 | ||
10a50311 JD |
945 | /* |
946 | * Ask the sessiond if we have new metadata waiting and update the | |
947 | * consumer metadata cache. | |
948 | */ | |
94d49140 | 949 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
950 | if (ret < 0) { |
951 | goto error; | |
952 | } | |
953 | ||
9ce5646a MD |
954 | health_code_update(); |
955 | ||
10a50311 JD |
956 | /* |
957 | * The metadata stream is NOT created in no monitor mode when the channel | |
958 | * is created on a sessiond ask channel command. | |
959 | */ | |
d2956687 | 960 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
961 | if (ret < 0) { |
962 | goto error; | |
963 | } | |
964 | ||
965 | metadata_stream = metadata_channel->metadata_stream; | |
a0377dfe | 966 | LTTNG_ASSERT(metadata_stream); |
10a50311 | 967 | |
947bd097 | 968 | metadata_stream->read_subbuffer_ops.lock(metadata_stream); |
10a50311 JD |
969 | if (relayd_id != (uint64_t) -1ULL) { |
970 | metadata_stream->net_seq_idx = relayd_id; | |
971 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 972 | } else { |
d2956687 JG |
973 | ret = consumer_stream_create_output_files(metadata_stream, |
974 | false); | |
975 | } | |
d2956687 JG |
976 | if (ret < 0) { |
977 | goto error_stream; | |
10a50311 JD |
978 | } |
979 | ||
04ef1097 | 980 | do { |
9ce5646a | 981 | health_code_update(); |
6f9449c2 | 982 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 983 | if (ret < 0) { |
94d49140 | 984 | goto error_stream; |
10a50311 | 985 | } |
04ef1097 | 986 | } while (ret > 0); |
10a50311 | 987 | |
10a50311 | 988 | error_stream: |
947bd097 | 989 | metadata_stream->read_subbuffer_ops.unlock(metadata_stream); |
10a50311 | 990 | /* |
947bd097 JR |
991 | * Clean up the stream completely because the next snapshot will use a |
992 | * new metadata stream. | |
10a50311 | 993 | */ |
10a50311 JD |
994 | consumer_stream_destroy(metadata_stream, NULL); |
995 | metadata_channel->metadata_stream = NULL; | |
996 | ||
997 | error: | |
998 | rcu_read_unlock(); | |
999 | return ret; | |
1000 | } | |
1001 | ||
128708c3 JG |
1002 | static |
1003 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1004 | const char **addr) | |
1005 | { | |
1006 | int ret; | |
1007 | unsigned long mmap_offset; | |
1008 | const char *mmap_base; | |
1009 | ||
97535efa | 1010 | mmap_base = (const char *) lttng_ust_ctl_get_mmap_base(stream->ustream); |
128708c3 JG |
1011 | if (!mmap_base) { |
1012 | ERR("Failed to get mmap base for stream `%s`", | |
1013 | stream->name); | |
1014 | ret = -EPERM; | |
1015 | goto error; | |
1016 | } | |
1017 | ||
b623cb6a | 1018 | ret = lttng_ust_ctl_get_mmap_read_offset(stream->ustream, &mmap_offset); |
128708c3 JG |
1019 | if (ret != 0) { |
1020 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1021 | ret = -EINVAL; | |
1022 | goto error; | |
1023 | } | |
1024 | ||
1025 | *addr = mmap_base + mmap_offset; | |
1026 | error: | |
1027 | return ret; | |
1028 | ||
1029 | } | |
1030 | ||
10a50311 JD |
1031 | /* |
1032 | * Take a snapshot of all the stream of a channel. | |
d2956687 | 1033 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1034 | * |
1035 | * Returns 0 on success, < 0 on error | |
1036 | */ | |
3eb928aa MD |
1037 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1038 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1039 | uint64_t nb_packets_per_stream, |
1040 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1041 | { |
1042 | int ret; | |
1043 | unsigned use_relayd = 0; | |
1044 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1045 | struct lttng_consumer_stream *stream; |
1046 | ||
a0377dfe FD |
1047 | LTTNG_ASSERT(path); |
1048 | LTTNG_ASSERT(ctx); | |
48b7cdc2 | 1049 | ASSERT_RCU_READ_LOCKED(); |
10a50311 JD |
1050 | |
1051 | rcu_read_lock(); | |
1052 | ||
1053 | if (relayd_id != (uint64_t) -1ULL) { | |
1054 | use_relayd = 1; | |
1055 | } | |
1056 | ||
a0377dfe | 1057 | LTTNG_ASSERT(!channel->monitor); |
6a00837f | 1058 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1059 | |
1060 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1061 | health_code_update(); |
1062 | ||
10a50311 JD |
1063 | /* Lock stream because we are about to change its state. */ |
1064 | pthread_mutex_lock(&stream->lock); | |
a0377dfe | 1065 | LTTNG_ASSERT(channel->trace_chunk); |
d2956687 JG |
1066 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { |
1067 | /* | |
1068 | * Can't happen barring an internal error as the channel | |
1069 | * holds a reference to the trace chunk. | |
1070 | */ | |
1071 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1072 | ret = -1; | |
1073 | goto error_unlock; | |
1074 | } | |
a0377dfe | 1075 | LTTNG_ASSERT(!stream->trace_chunk); |
d2956687 JG |
1076 | stream->trace_chunk = channel->trace_chunk; |
1077 | ||
10a50311 JD |
1078 | stream->net_seq_idx = relayd_id; |
1079 | ||
1080 | if (use_relayd) { | |
1081 | ret = consumer_send_relayd_stream(stream, path); | |
1082 | if (ret < 0) { | |
1083 | goto error_unlock; | |
1084 | } | |
1085 | } else { | |
d2956687 JG |
1086 | ret = consumer_stream_create_output_files(stream, |
1087 | false); | |
10a50311 JD |
1088 | if (ret < 0) { |
1089 | goto error_unlock; | |
1090 | } | |
d2956687 JG |
1091 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1092 | stream->key); | |
10a50311 JD |
1093 | } |
1094 | ||
d4d80f77 MD |
1095 | /* |
1096 | * If tracing is active, we want to perform a "full" buffer flush. | |
1097 | * Else, if quiescent, it has already been done by the prior stop. | |
1098 | */ | |
1099 | if (!stream->quiescent) { | |
881fc67f MD |
1100 | ret = lttng_ust_ctl_flush_buffer(stream->ustream, 0); |
1101 | if (ret < 0) { | |
1102 | ERR("Failed to flush buffer during snapshot of channel: channel key = %" PRIu64 ", channel name = '%s'", | |
1103 | channel->key, channel->name); | |
1104 | goto error_unlock; | |
1105 | } | |
d4d80f77 | 1106 | } |
10a50311 JD |
1107 | |
1108 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1109 | if (ret < 0) { | |
1110 | ERR("Taking UST snapshot"); | |
1111 | goto error_unlock; | |
1112 | } | |
1113 | ||
1114 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1115 | if (ret < 0) { | |
1116 | ERR("Produced UST snapshot position"); | |
1117 | goto error_unlock; | |
1118 | } | |
1119 | ||
1120 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1121 | if (ret < 0) { | |
1122 | ERR("Consumerd UST snapshot position"); | |
1123 | goto error_unlock; | |
1124 | } | |
1125 | ||
5c786ded JD |
1126 | /* |
1127 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1128 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1129 | * daemon should never send a maximum stream size that is lower than |
1130 | * subbuffer size. | |
1131 | */ | |
d07ceecd MD |
1132 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1133 | produced_pos, nb_packets_per_stream, | |
1134 | stream->max_sb_size); | |
5c786ded | 1135 | |
9377d830 | 1136 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1137 | ssize_t read_len; |
1138 | unsigned long len, padded_len; | |
128708c3 | 1139 | const char *subbuf_addr; |
fd424d99 | 1140 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1141 | |
9ce5646a MD |
1142 | health_code_update(); |
1143 | ||
10a50311 JD |
1144 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1145 | ||
b623cb6a | 1146 | ret = lttng_ust_ctl_get_subbuf(stream->ustream, &consumed_pos); |
10a50311 JD |
1147 | if (ret < 0) { |
1148 | if (ret != -EAGAIN) { | |
b623cb6a | 1149 | PERROR("lttng_ust_ctl_get_subbuf snapshot"); |
10a50311 JD |
1150 | goto error_close_stream; |
1151 | } | |
1152 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1153 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1154 | stream->chan->lost_packets++; |
10a50311 JD |
1155 | continue; |
1156 | } | |
1157 | ||
b623cb6a | 1158 | ret = lttng_ust_ctl_get_subbuf_size(stream->ustream, &len); |
10a50311 | 1159 | if (ret < 0) { |
b623cb6a | 1160 | ERR("Snapshot lttng_ust_ctl_get_subbuf_size"); |
10a50311 JD |
1161 | goto error_put_subbuf; |
1162 | } | |
1163 | ||
b623cb6a | 1164 | ret = lttng_ust_ctl_get_padded_subbuf_size(stream->ustream, &padded_len); |
10a50311 | 1165 | if (ret < 0) { |
b623cb6a | 1166 | ERR("Snapshot lttng_ust_ctl_get_padded_subbuf_size"); |
10a50311 JD |
1167 | goto error_put_subbuf; |
1168 | } | |
1169 | ||
128708c3 JG |
1170 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1171 | if (ret) { | |
1172 | goto error_put_subbuf; | |
1173 | } | |
1174 | ||
fd424d99 JG |
1175 | subbuf_view = lttng_buffer_view_init( |
1176 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 1177 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
6f9449c2 | 1178 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1179 | if (use_relayd) { |
1180 | if (read_len != len) { | |
56591bac | 1181 | ret = -EPERM; |
10a50311 JD |
1182 | goto error_put_subbuf; |
1183 | } | |
1184 | } else { | |
1185 | if (read_len != padded_len) { | |
56591bac | 1186 | ret = -EPERM; |
10a50311 JD |
1187 | goto error_put_subbuf; |
1188 | } | |
1189 | } | |
1190 | ||
b623cb6a | 1191 | ret = lttng_ust_ctl_put_subbuf(stream->ustream); |
10a50311 | 1192 | if (ret < 0) { |
b623cb6a | 1193 | ERR("Snapshot lttng_ust_ctl_put_subbuf"); |
10a50311 JD |
1194 | goto error_close_stream; |
1195 | } | |
1196 | consumed_pos += stream->max_sb_size; | |
1197 | } | |
1198 | ||
1199 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1200 | consumer_stream_close(stream); | |
1201 | pthread_mutex_unlock(&stream->lock); | |
1202 | } | |
1203 | ||
1204 | rcu_read_unlock(); | |
1205 | return 0; | |
1206 | ||
1207 | error_put_subbuf: | |
b623cb6a MJ |
1208 | if (lttng_ust_ctl_put_subbuf(stream->ustream) < 0) { |
1209 | ERR("Snapshot lttng_ust_ctl_put_subbuf"); | |
10a50311 JD |
1210 | } |
1211 | error_close_stream: | |
1212 | consumer_stream_close(stream); | |
1213 | error_unlock: | |
1214 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1215 | rcu_read_unlock(); |
d88aee68 DG |
1216 | return ret; |
1217 | } | |
1218 | ||
b1316da1 JG |
1219 | static |
1220 | void metadata_stream_reset_cache_consumed_position( | |
1221 | struct lttng_consumer_stream *stream) | |
1222 | { | |
1223 | ASSERT_LOCKED(stream->lock); | |
1224 | ||
1225 | DBG("Reset metadata cache of session %" PRIu64, | |
1226 | stream->chan->session_id); | |
1227 | stream->ust_metadata_pushed = 0; | |
1228 | } | |
1229 | ||
331744e3 | 1230 | /* |
c585821b MD |
1231 | * Receive the metadata updates from the sessiond. Supports receiving |
1232 | * overlapping metadata, but is needs to always belong to a contiguous | |
1233 | * range starting from 0. | |
1234 | * Be careful about the locks held when calling this function: it needs | |
1235 | * the metadata cache flush to concurrently progress in order to | |
1236 | * complete. | |
331744e3 JD |
1237 | */ |
1238 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1239 | uint64_t len, uint64_t version, |
1240 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1241 | { |
0c759fc9 | 1242 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 | 1243 | char *metadata_str; |
b1316da1 | 1244 | enum consumer_metadata_cache_write_status cache_write_status; |
331744e3 | 1245 | |
8fd623e0 | 1246 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 | 1247 | |
64803277 | 1248 | metadata_str = calloc<char>(len); |
331744e3 JD |
1249 | if (!metadata_str) { |
1250 | PERROR("zmalloc metadata string"); | |
1251 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1252 | goto end; | |
1253 | } | |
1254 | ||
9ce5646a MD |
1255 | health_code_update(); |
1256 | ||
331744e3 JD |
1257 | /* Receive metadata string. */ |
1258 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1259 | if (ret < 0) { | |
1260 | /* Session daemon is dead so return gracefully. */ | |
1261 | ret_code = ret; | |
1262 | goto end_free; | |
1263 | } | |
1264 | ||
9ce5646a MD |
1265 | health_code_update(); |
1266 | ||
331744e3 | 1267 | pthread_mutex_lock(&channel->metadata_cache->lock); |
b1316da1 | 1268 | cache_write_status = consumer_metadata_cache_write( |
a25d34bc JG |
1269 | channel->metadata_cache, offset, len, version, |
1270 | metadata_str); | |
3bdc49f3 | 1271 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
b1316da1 JG |
1272 | switch (cache_write_status) { |
1273 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE: | |
1274 | /* | |
1275 | * The write entirely overlapped with existing contents of the | |
1276 | * same metadata version (same content); there is nothing to do. | |
1277 | */ | |
1278 | break; | |
1279 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED: | |
1280 | /* | |
1281 | * The metadata cache was invalidated (previously pushed | |
1282 | * content has been overwritten). Reset the stream's consumed | |
1283 | * metadata position to ensure the metadata poll thread consumes | |
1284 | * the whole cache. | |
1285 | */ | |
947bd097 JR |
1286 | |
1287 | /* | |
1288 | * channel::metadata_stream can be null when the metadata | |
1289 | * channel is under a snapshot session type. No need to update | |
1290 | * the stream position in that scenario. | |
1291 | */ | |
1292 | if (channel->metadata_stream != NULL) { | |
1293 | pthread_mutex_lock(&channel->metadata_stream->lock); | |
1294 | metadata_stream_reset_cache_consumed_position( | |
1295 | channel->metadata_stream); | |
1296 | pthread_mutex_unlock(&channel->metadata_stream->lock); | |
1297 | } else { | |
1298 | /* Validate we are in snapshot mode. */ | |
1299 | LTTNG_ASSERT(!channel->monitor); | |
1300 | } | |
b1316da1 JG |
1301 | /* Fall-through. */ |
1302 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT: | |
1303 | /* | |
1304 | * In both cases, the metadata poll thread has new data to | |
1305 | * consume. | |
1306 | */ | |
1307 | ret = consumer_metadata_wakeup_pipe(channel); | |
1308 | if (ret) { | |
1309 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
1310 | goto end_free; | |
1311 | } | |
1312 | break; | |
1313 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR: | |
331744e3 JD |
1314 | /* Unable to handle metadata. Notify session daemon. */ |
1315 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1316 | /* |
1317 | * Skip metadata flush on write error since the offset and len might | |
1318 | * not have been updated which could create an infinite loop below when | |
1319 | * waiting for the metadata cache to be flushed. | |
1320 | */ | |
a32bd775 | 1321 | goto end_free; |
b1316da1 JG |
1322 | default: |
1323 | abort(); | |
331744e3 | 1324 | } |
331744e3 | 1325 | |
94d49140 JD |
1326 | if (!wait) { |
1327 | goto end_free; | |
1328 | } | |
5e41ebe1 | 1329 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1330 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1331 | |
1332 | health_code_update(); | |
1333 | ||
331744e3 JD |
1334 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1335 | } | |
1336 | ||
1337 | end_free: | |
1338 | free(metadata_str); | |
1339 | end: | |
1340 | return ret_code; | |
1341 | } | |
1342 | ||
4cbc1a04 DG |
1343 | /* |
1344 | * Receive command from session daemon and process it. | |
1345 | * | |
1346 | * Return 1 on success else a negative value or 0. | |
1347 | */ | |
3bd1e081 MD |
1348 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1349 | int sock, struct pollfd *consumer_sockpoll) | |
1350 | { | |
594c7c00 | 1351 | int ret_func; |
0c759fc9 | 1352 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1353 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1354 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1355 | |
9ce5646a MD |
1356 | health_code_update(); |
1357 | ||
594c7c00 SM |
1358 | { |
1359 | ssize_t ret_recv; | |
1360 | ||
1361 | ret_recv = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
1362 | if (ret_recv != sizeof(msg)) { | |
1363 | DBG("Consumer received unexpected message size %zd (expects %zu)", | |
1364 | ret_recv, sizeof(msg)); | |
1365 | /* | |
1366 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1367 | * since the caller handles this. | |
1368 | */ | |
1369 | if (ret_recv > 0) { | |
1370 | lttng_consumer_send_error(ctx, | |
1371 | LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
1372 | ret_recv = -1; | |
1373 | } | |
1374 | return ret_recv; | |
489f70e9 | 1375 | } |
3bd1e081 | 1376 | } |
9ce5646a MD |
1377 | |
1378 | health_code_update(); | |
1379 | ||
84382d49 | 1380 | /* deprecated */ |
a0377dfe | 1381 | LTTNG_ASSERT(msg.cmd_type != LTTNG_CONSUMER_STOP); |
3bd1e081 | 1382 | |
9ce5646a MD |
1383 | health_code_update(); |
1384 | ||
3f8e211f | 1385 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1386 | rcu_read_lock(); |
1387 | ||
3bd1e081 | 1388 | switch (msg.cmd_type) { |
00e2e675 DG |
1389 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1390 | { | |
4222116f JR |
1391 | uint32_t major = msg.u.relayd_sock.major; |
1392 | uint32_t minor = msg.u.relayd_sock.minor; | |
1393 | enum lttcomm_sock_proto protocol = | |
1394 | (enum lttcomm_sock_proto) msg.u.relayd_sock | |
1395 | .relayd_socket_protocol; | |
1396 | ||
f50f23d9 | 1397 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1398 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
4222116f JR |
1399 | msg.u.relayd_sock.type, ctx, sock, |
1400 | consumer_sockpoll, msg.u.relayd_sock.session_id, | |
1401 | msg.u.relayd_sock.relayd_session_id, major, | |
1402 | minor, protocol); | |
00e2e675 DG |
1403 | goto end_nosignal; |
1404 | } | |
173af62f DG |
1405 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1406 | { | |
a6ba4fe1 | 1407 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1408 | struct consumer_relayd_sock_pair *relayd; |
1409 | ||
a6ba4fe1 | 1410 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1411 | |
1412 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1413 | relayd = consumer_find_relayd(index); |
173af62f | 1414 | if (relayd == NULL) { |
3448e266 | 1415 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1416 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1417 | } |
1418 | ||
a6ba4fe1 DG |
1419 | /* |
1420 | * Each relayd socket pair has a refcount of stream attached to it | |
1421 | * which tells if the relayd is still active or not depending on the | |
1422 | * refcount value. | |
1423 | * | |
1424 | * This will set the destroy flag of the relayd object and destroy it | |
1425 | * if the refcount reaches zero when called. | |
1426 | * | |
1427 | * The destroy can happen either here or when a stream fd hangs up. | |
1428 | */ | |
f50f23d9 DG |
1429 | if (relayd) { |
1430 | consumer_flag_relayd_for_destroy(relayd); | |
1431 | } | |
1432 | ||
d88aee68 | 1433 | goto end_msg_sessiond; |
173af62f | 1434 | } |
3bd1e081 MD |
1435 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1436 | { | |
3f8e211f | 1437 | rcu_read_unlock(); |
7ad0a0cb | 1438 | return -ENOSYS; |
3bd1e081 | 1439 | } |
6d805429 | 1440 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1441 | { |
594c7c00 SM |
1442 | int is_data_pending; |
1443 | ssize_t ret_send; | |
6d805429 | 1444 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1445 | |
6d805429 | 1446 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1447 | |
3be74084 | 1448 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1449 | |
1450 | /* Send back returned value to session daemon */ | |
594c7c00 | 1451 | ret_send = lttcomm_send_unix_sock(sock, &is_data_pending, |
3be74084 | 1452 | sizeof(is_data_pending)); |
594c7c00 SM |
1453 | if (ret_send < 0) { |
1454 | DBG("Error when sending the data pending ret code: %zd", | |
1455 | ret_send); | |
489f70e9 | 1456 | goto error_fatal; |
ca22feea | 1457 | } |
f50f23d9 DG |
1458 | |
1459 | /* | |
1460 | * No need to send back a status message since the data pending | |
1461 | * returned value is the response. | |
1462 | */ | |
ca22feea | 1463 | break; |
53632229 | 1464 | } |
ffe60014 DG |
1465 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1466 | { | |
594c7c00 | 1467 | int ret_ask_channel, ret_add_channel, ret_send; |
b623cb6a | 1468 | struct lttng_ust_ctl_consumer_channel_attr attr; |
d2956687 JG |
1469 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1470 | const struct lttng_credentials buffer_credentials = { | |
ff588497 JR |
1471 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.uid), |
1472 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.gid), | |
d2956687 | 1473 | }; |
ffe60014 DG |
1474 | |
1475 | /* Create a plain object and reserve a channel key. */ | |
8696b40b | 1476 | channel = consumer_allocate_channel(msg.u.ask_channel.key, |
a2814ea7 | 1477 | msg.u.ask_channel.session_id, |
8696b40b JR |
1478 | msg.u.ask_channel.chunk_id.is_set ? &chunk_id : NULL, |
1479 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
d2956687 | 1480 | msg.u.ask_channel.relayd_id, |
1624d5b7 | 1481 | (enum lttng_event_output) msg.u.ask_channel.output, |
8696b40b JR |
1482 | msg.u.ask_channel.tracefile_size, msg.u.ask_channel.tracefile_count, |
1483 | msg.u.ask_channel.session_id_per_pid, msg.u.ask_channel.monitor, | |
1484 | msg.u.ask_channel.live_timer_interval, msg.u.ask_channel.is_live, | |
1485 | msg.u.ask_channel.root_shm_path, msg.u.ask_channel.shm_path, | |
1486 | msg.u.ask_channel.trace_format); | |
ffe60014 DG |
1487 | if (!channel) { |
1488 | goto end_channel_error; | |
1489 | } | |
1490 | ||
d2956687 JG |
1491 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1492 | buffer_credentials); | |
1493 | ||
567eb353 DG |
1494 | /* |
1495 | * Assign UST application UID to the channel. This value is ignored for | |
1496 | * per PID buffers. This is specific to UST thus setting this after the | |
1497 | * allocation. | |
1498 | */ | |
1499 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1500 | ||
ffe60014 DG |
1501 | /* Build channel attributes from received message. */ |
1502 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1503 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1504 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1505 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1506 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1507 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1508 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1509 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1510 | |
0c759fc9 DG |
1511 | /* Match channel buffer type to the UST abi. */ |
1512 | switch (msg.u.ask_channel.output) { | |
1513 | case LTTNG_EVENT_MMAP: | |
1514 | default: | |
fc4b93fa | 1515 | attr.output = LTTNG_UST_ABI_MMAP; |
0c759fc9 DG |
1516 | break; |
1517 | } | |
1518 | ||
ffe60014 DG |
1519 | /* Translate and save channel type. */ |
1520 | switch (msg.u.ask_channel.type) { | |
fc4b93fa | 1521 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
ffe60014 | 1522 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
fc4b93fa | 1523 | attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; |
8633d6e3 MD |
1524 | /* |
1525 | * Set refcount to 1 for owner. Below, we will | |
1526 | * pass ownership to the | |
1527 | * consumer_thread_channel_poll() thread. | |
1528 | */ | |
1529 | channel->refcount = 1; | |
ffe60014 | 1530 | break; |
fc4b93fa | 1531 | case LTTNG_UST_ABI_CHAN_METADATA: |
ffe60014 | 1532 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
fc4b93fa | 1533 | attr.type = LTTNG_UST_ABI_CHAN_METADATA; |
ffe60014 DG |
1534 | break; |
1535 | default: | |
a0377dfe | 1536 | abort(); |
ffe60014 DG |
1537 | goto error_fatal; |
1538 | }; | |
1539 | ||
9ce5646a MD |
1540 | health_code_update(); |
1541 | ||
594c7c00 SM |
1542 | ret_ask_channel = ask_channel(ctx, channel, &attr); |
1543 | if (ret_ask_channel < 0) { | |
ffe60014 DG |
1544 | goto end_channel_error; |
1545 | } | |
1546 | ||
fc4b93fa | 1547 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
594c7c00 SM |
1548 | int ret_allocate; |
1549 | ||
1550 | ret_allocate = consumer_metadata_cache_allocate( | |
1551 | channel); | |
1552 | if (ret_allocate < 0) { | |
fc643247 MD |
1553 | ERR("Allocating metadata cache"); |
1554 | goto end_channel_error; | |
1555 | } | |
1556 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1557 | attr.switch_timer_interval = 0; | |
94d49140 | 1558 | } else { |
e9404c27 JG |
1559 | int monitor_start_ret; |
1560 | ||
94d49140 JD |
1561 | consumer_timer_live_start(channel, |
1562 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1563 | monitor_start_ret = consumer_timer_monitor_start( |
1564 | channel, | |
1565 | msg.u.ask_channel.monitor_timer_interval); | |
1566 | if (monitor_start_ret < 0) { | |
1567 | ERR("Starting channel monitoring timer failed"); | |
1568 | goto end_channel_error; | |
1569 | } | |
fc643247 MD |
1570 | } |
1571 | ||
9ce5646a MD |
1572 | health_code_update(); |
1573 | ||
ffe60014 DG |
1574 | /* |
1575 | * Add the channel to the internal state AFTER all streams were created | |
1576 | * and successfully sent to session daemon. This way, all streams must | |
1577 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1578 | * If add_channel succeeds, ownership of the channel is |
1579 | * passed to consumer_thread_channel_poll(). | |
ffe60014 | 1580 | */ |
594c7c00 SM |
1581 | ret_add_channel = add_channel(channel, ctx); |
1582 | if (ret_add_channel < 0) { | |
fc4b93fa | 1583 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
ea88ca2a MD |
1584 | if (channel->switch_timer_enabled == 1) { |
1585 | consumer_timer_switch_stop(channel); | |
1586 | } | |
1587 | consumer_metadata_cache_destroy(channel); | |
1588 | } | |
d3e2ba59 JD |
1589 | if (channel->live_timer_enabled == 1) { |
1590 | consumer_timer_live_stop(channel); | |
1591 | } | |
e9404c27 JG |
1592 | if (channel->monitor_timer_enabled == 1) { |
1593 | consumer_timer_monitor_stop(channel); | |
1594 | } | |
ffe60014 DG |
1595 | goto end_channel_error; |
1596 | } | |
1597 | ||
9ce5646a MD |
1598 | health_code_update(); |
1599 | ||
ffe60014 DG |
1600 | /* |
1601 | * Channel and streams are now created. Inform the session daemon that | |
1602 | * everything went well and should wait to receive the channel and | |
1603 | * streams with ustctl API. | |
1604 | */ | |
594c7c00 SM |
1605 | ret_send = consumer_send_status_channel(sock, channel); |
1606 | if (ret_send < 0) { | |
ffe60014 | 1607 | /* |
489f70e9 | 1608 | * There is probably a problem on the socket. |
ffe60014 | 1609 | */ |
489f70e9 | 1610 | goto error_fatal; |
ffe60014 DG |
1611 | } |
1612 | ||
1613 | break; | |
1614 | } | |
1615 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1616 | { | |
1617 | int ret, relayd_err = 0; | |
d88aee68 | 1618 | uint64_t key = msg.u.get_channel.key; |
594c7c00 | 1619 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1620 | |
594c7c00 SM |
1621 | found_channel = consumer_find_channel(key); |
1622 | if (!found_channel) { | |
8fd623e0 | 1623 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1624 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
f3a1fc7b | 1625 | goto end_get_channel; |
ffe60014 DG |
1626 | } |
1627 | ||
9ce5646a MD |
1628 | health_code_update(); |
1629 | ||
a3a86f35 | 1630 | /* Send the channel to sessiond (and relayd, if applicable). */ |
594c7c00 SM |
1631 | ret = send_channel_to_sessiond_and_relayd( |
1632 | sock, found_channel, ctx, &relayd_err); | |
ffe60014 DG |
1633 | if (ret < 0) { |
1634 | if (relayd_err) { | |
1635 | /* | |
1636 | * We were unable to send to the relayd the stream so avoid | |
1637 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1638 | * and the consumer can continue its work. The above call |
1639 | * has sent the error status message to the sessiond. | |
ffe60014 | 1640 | */ |
f3a1fc7b | 1641 | goto end_get_channel_nosignal; |
ffe60014 DG |
1642 | } |
1643 | /* | |
1644 | * The communicaton was broken hence there is a bad state between | |
1645 | * the consumer and sessiond so stop everything. | |
1646 | */ | |
f3a1fc7b | 1647 | goto error_get_channel_fatal; |
ffe60014 DG |
1648 | } |
1649 | ||
9ce5646a MD |
1650 | health_code_update(); |
1651 | ||
10a50311 JD |
1652 | /* |
1653 | * In no monitor mode, the streams ownership is kept inside the channel | |
1654 | * so don't send them to the data thread. | |
1655 | */ | |
594c7c00 | 1656 | if (!found_channel->monitor) { |
f3a1fc7b | 1657 | goto end_get_channel; |
10a50311 JD |
1658 | } |
1659 | ||
594c7c00 | 1660 | ret = send_streams_to_thread(found_channel, ctx); |
d88aee68 DG |
1661 | if (ret < 0) { |
1662 | /* | |
1663 | * If we are unable to send the stream to the thread, there is | |
1664 | * a big problem so just stop everything. | |
1665 | */ | |
f3a1fc7b | 1666 | goto error_get_channel_fatal; |
ffe60014 | 1667 | } |
ffe60014 | 1668 | /* List MUST be empty after or else it could be reused. */ |
a0377dfe | 1669 | LTTNG_ASSERT(cds_list_empty(&found_channel->streams.head)); |
f3a1fc7b | 1670 | end_get_channel: |
d88aee68 | 1671 | goto end_msg_sessiond; |
f3a1fc7b JG |
1672 | error_get_channel_fatal: |
1673 | goto error_fatal; | |
1674 | end_get_channel_nosignal: | |
1675 | goto end_nosignal; | |
d88aee68 DG |
1676 | } |
1677 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1678 | { | |
1679 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1680 | |
a0cbdd2e MD |
1681 | /* |
1682 | * Only called if streams have not been sent to stream | |
1683 | * manager thread. However, channel has been sent to | |
1684 | * channel manager thread. | |
1685 | */ | |
1686 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1687 | goto end_msg_sessiond; |
ffe60014 | 1688 | } |
d88aee68 DG |
1689 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1690 | { | |
1691 | int ret; | |
1692 | ||
1693 | ret = close_metadata(msg.u.close_metadata.key); | |
1694 | if (ret != 0) { | |
97535efa | 1695 | ret_code = (lttcomm_return_code) ret; |
d88aee68 DG |
1696 | } |
1697 | ||
1698 | goto end_msg_sessiond; | |
1699 | } | |
7972aab2 DG |
1700 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1701 | { | |
1702 | int ret; | |
1703 | ||
1704 | ret = flush_channel(msg.u.flush_channel.key); | |
1705 | if (ret != 0) { | |
97535efa | 1706 | ret_code = (lttcomm_return_code) ret; |
7972aab2 DG |
1707 | } |
1708 | ||
1709 | goto end_msg_sessiond; | |
1710 | } | |
0dd01979 MD |
1711 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1712 | { | |
1713 | int ret; | |
1714 | ||
1715 | ret = clear_quiescent_channel( | |
1716 | msg.u.clear_quiescent_channel.key); | |
1717 | if (ret != 0) { | |
97535efa | 1718 | ret_code = (lttcomm_return_code) ret; |
0dd01979 MD |
1719 | } |
1720 | ||
1721 | goto end_msg_sessiond; | |
1722 | } | |
d88aee68 | 1723 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1724 | { |
1725 | int ret; | |
d88aee68 | 1726 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1727 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1728 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1729 | uint64_t version = msg.u.push_metadata.version; |
594c7c00 | 1730 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1731 | |
8fd623e0 DG |
1732 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1733 | len); | |
ffe60014 | 1734 | |
594c7c00 SM |
1735 | found_channel = consumer_find_channel(key); |
1736 | if (!found_channel) { | |
000baf6a DG |
1737 | /* |
1738 | * This is possible if the metadata creation on the consumer side | |
1739 | * is in flight vis-a-vis a concurrent push metadata from the | |
1740 | * session daemon. Simply return that the channel failed and the | |
1741 | * session daemon will handle that message correctly considering | |
1742 | * that this race is acceptable thus the DBG() statement here. | |
1743 | */ | |
1744 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1745 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
a8ffe244 | 1746 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1747 | } |
1748 | ||
9ce5646a MD |
1749 | health_code_update(); |
1750 | ||
c585821b MD |
1751 | if (!len) { |
1752 | /* | |
1753 | * There is nothing to receive. We have simply | |
1754 | * checked whether the channel can be found. | |
1755 | */ | |
1756 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
a8ffe244 | 1757 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1758 | } |
1759 | ||
d88aee68 | 1760 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1761 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1762 | if (ret < 0) { |
1763 | /* Somehow, the session daemon is not responding anymore. */ | |
a8ffe244 | 1764 | goto error_push_metadata_fatal; |
d88aee68 DG |
1765 | } |
1766 | ||
9ce5646a MD |
1767 | health_code_update(); |
1768 | ||
d88aee68 | 1769 | /* Wait for more data. */ |
9ce5646a MD |
1770 | health_poll_entry(); |
1771 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1772 | health_poll_exit(); | |
84382d49 | 1773 | if (ret) { |
a8ffe244 | 1774 | goto error_push_metadata_fatal; |
d88aee68 DG |
1775 | } |
1776 | ||
9ce5646a MD |
1777 | health_code_update(); |
1778 | ||
594c7c00 SM |
1779 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, len, |
1780 | version, found_channel, 0, 1); | |
d88aee68 | 1781 | if (ret < 0) { |
331744e3 | 1782 | /* error receiving from sessiond */ |
a8ffe244 | 1783 | goto error_push_metadata_fatal; |
331744e3 | 1784 | } else { |
97535efa | 1785 | ret_code = (lttcomm_return_code) ret; |
a8ffe244 | 1786 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1787 | } |
a8ffe244 JG |
1788 | end_push_metadata_msg_sessiond: |
1789 | goto end_msg_sessiond; | |
1790 | error_push_metadata_fatal: | |
1791 | goto error_fatal; | |
d88aee68 DG |
1792 | } |
1793 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1794 | { | |
1795 | int ret; | |
1796 | ||
1797 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1798 | if (ret) { | |
97535efa | 1799 | ret_code = (lttcomm_return_code) ret; |
d88aee68 DG |
1800 | } |
1801 | goto end_msg_sessiond; | |
ffe60014 | 1802 | } |
6dc3064a DG |
1803 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1804 | { | |
594c7c00 | 1805 | struct lttng_consumer_channel *found_channel; |
3eb928aa | 1806 | uint64_t key = msg.u.snapshot_channel.key; |
594c7c00 | 1807 | int ret_send; |
3eb928aa | 1808 | |
594c7c00 SM |
1809 | found_channel = consumer_find_channel(key); |
1810 | if (!found_channel) { | |
3eb928aa MD |
1811 | DBG("UST snapshot channel not found for key %" PRIu64, key); |
1812 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1813 | } else { |
3eb928aa | 1814 | if (msg.u.snapshot_channel.metadata) { |
594c7c00 SM |
1815 | int ret_snapshot; |
1816 | ||
1817 | ret_snapshot = snapshot_metadata(found_channel, | |
1818 | key, | |
3eb928aa MD |
1819 | msg.u.snapshot_channel.pathname, |
1820 | msg.u.snapshot_channel.relayd_id, | |
d2956687 | 1821 | ctx); |
594c7c00 | 1822 | if (ret_snapshot < 0) { |
3eb928aa MD |
1823 | ERR("Snapshot metadata failed"); |
1824 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1825 | } | |
1826 | } else { | |
594c7c00 SM |
1827 | int ret_snapshot; |
1828 | ||
1829 | ret_snapshot = snapshot_channel(found_channel, | |
1830 | key, | |
3eb928aa MD |
1831 | msg.u.snapshot_channel.pathname, |
1832 | msg.u.snapshot_channel.relayd_id, | |
594c7c00 SM |
1833 | msg.u.snapshot_channel |
1834 | .nb_packets_per_stream, | |
3eb928aa | 1835 | ctx); |
594c7c00 | 1836 | if (ret_snapshot < 0) { |
3eb928aa MD |
1837 | ERR("Snapshot channel failed"); |
1838 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1839 | } | |
10a50311 JD |
1840 | } |
1841 | } | |
9ce5646a | 1842 | health_code_update(); |
594c7c00 SM |
1843 | ret_send = consumer_send_status_msg(sock, ret_code); |
1844 | if (ret_send < 0) { | |
6dc3064a DG |
1845 | /* Somehow, the session daemon is not responding anymore. */ |
1846 | goto end_nosignal; | |
1847 | } | |
9ce5646a | 1848 | health_code_update(); |
6dc3064a DG |
1849 | break; |
1850 | } | |
fb83fe64 JD |
1851 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1852 | { | |
beb59458 MJ |
1853 | int ret = 0; |
1854 | uint64_t discarded_events; | |
fb83fe64 JD |
1855 | struct lttng_ht_iter iter; |
1856 | struct lttng_ht *ht; | |
1857 | struct lttng_consumer_stream *stream; | |
1858 | uint64_t id = msg.u.discarded_events.session_id; | |
1859 | uint64_t key = msg.u.discarded_events.channel_key; | |
1860 | ||
1861 | DBG("UST consumer discarded events command for session id %" | |
1862 | PRIu64, id); | |
1863 | rcu_read_lock(); | |
fa29bfbf | 1864 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1865 | |
fa29bfbf | 1866 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1867 | |
1868 | /* | |
1869 | * We only need a reference to the channel, but they are not | |
1870 | * directly indexed, so we just use the first matching stream | |
1871 | * to extract the information we need, we default to 0 if not | |
1872 | * found (no events are dropped if the channel is not yet in | |
1873 | * use). | |
1874 | */ | |
beb59458 | 1875 | discarded_events = 0; |
fb83fe64 JD |
1876 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1877 | ht->hash_fct(&id, lttng_ht_seed), | |
1878 | ht->match_fct, &id, | |
1879 | &iter.iter, stream, node_session_id.node) { | |
1880 | if (stream->chan->key == key) { | |
beb59458 | 1881 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1882 | break; |
1883 | } | |
1884 | } | |
fa29bfbf | 1885 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1886 | rcu_read_unlock(); |
1887 | ||
1888 | DBG("UST consumer discarded events command for session id %" | |
1889 | PRIu64 ", channel key %" PRIu64, id, key); | |
1890 | ||
1891 | health_code_update(); | |
1892 | ||
1893 | /* Send back returned value to session daemon */ | |
beb59458 | 1894 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1895 | if (ret < 0) { |
1896 | PERROR("send discarded events"); | |
1897 | goto error_fatal; | |
1898 | } | |
1899 | ||
1900 | break; | |
1901 | } | |
1902 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1903 | { | |
9a06e8d4 JG |
1904 | int ret; |
1905 | uint64_t lost_packets; | |
fb83fe64 JD |
1906 | struct lttng_ht_iter iter; |
1907 | struct lttng_ht *ht; | |
1908 | struct lttng_consumer_stream *stream; | |
1909 | uint64_t id = msg.u.lost_packets.session_id; | |
1910 | uint64_t key = msg.u.lost_packets.channel_key; | |
1911 | ||
1912 | DBG("UST consumer lost packets command for session id %" | |
1913 | PRIu64, id); | |
1914 | rcu_read_lock(); | |
fa29bfbf | 1915 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1916 | |
fa29bfbf | 1917 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1918 | |
1919 | /* | |
1920 | * We only need a reference to the channel, but they are not | |
1921 | * directly indexed, so we just use the first matching stream | |
1922 | * to extract the information we need, we default to 0 if not | |
1923 | * found (no packets lost if the channel is not yet in use). | |
1924 | */ | |
9a06e8d4 | 1925 | lost_packets = 0; |
fb83fe64 JD |
1926 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1927 | ht->hash_fct(&id, lttng_ht_seed), | |
1928 | ht->match_fct, &id, | |
1929 | &iter.iter, stream, node_session_id.node) { | |
1930 | if (stream->chan->key == key) { | |
9a06e8d4 | 1931 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1932 | break; |
1933 | } | |
1934 | } | |
fa29bfbf | 1935 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1936 | rcu_read_unlock(); |
1937 | ||
1938 | DBG("UST consumer lost packets command for session id %" | |
1939 | PRIu64 ", channel key %" PRIu64, id, key); | |
1940 | ||
1941 | health_code_update(); | |
1942 | ||
1943 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1944 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1945 | sizeof(lost_packets)); | |
fb83fe64 JD |
1946 | if (ret < 0) { |
1947 | PERROR("send lost packets"); | |
1948 | goto error_fatal; | |
1949 | } | |
1950 | ||
1951 | break; | |
1952 | } | |
b3530820 JG |
1953 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1954 | { | |
594c7c00 SM |
1955 | int channel_monitor_pipe, ret_send, |
1956 | ret_set_channel_monitor_pipe; | |
1957 | ssize_t ret_recv; | |
b3530820 JG |
1958 | |
1959 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1960 | /* Successfully received the command's type. */ | |
594c7c00 SM |
1961 | ret_send = consumer_send_status_msg(sock, ret_code); |
1962 | if (ret_send < 0) { | |
b3530820 JG |
1963 | goto error_fatal; |
1964 | } | |
1965 | ||
594c7c00 SM |
1966 | ret_recv = lttcomm_recv_fds_unix_sock( |
1967 | sock, &channel_monitor_pipe, 1); | |
1968 | if (ret_recv != sizeof(channel_monitor_pipe)) { | |
b3530820 JG |
1969 | ERR("Failed to receive channel monitor pipe"); |
1970 | goto error_fatal; | |
1971 | } | |
1972 | ||
1973 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
594c7c00 SM |
1974 | ret_set_channel_monitor_pipe = |
1975 | consumer_timer_thread_set_channel_monitor_pipe( | |
1976 | channel_monitor_pipe); | |
1977 | if (!ret_set_channel_monitor_pipe) { | |
b3530820 | 1978 | int flags; |
594c7c00 | 1979 | int ret_fcntl; |
b3530820 JG |
1980 | |
1981 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1982 | /* Set the pipe as non-blocking. */ | |
594c7c00 SM |
1983 | ret_fcntl = fcntl(channel_monitor_pipe, F_GETFL, 0); |
1984 | if (ret_fcntl == -1) { | |
b3530820 JG |
1985 | PERROR("fcntl get flags of the channel monitoring pipe"); |
1986 | goto error_fatal; | |
1987 | } | |
594c7c00 | 1988 | flags = ret_fcntl; |
b3530820 | 1989 | |
594c7c00 | 1990 | ret_fcntl = fcntl(channel_monitor_pipe, F_SETFL, |
b3530820 | 1991 | flags | O_NONBLOCK); |
594c7c00 | 1992 | if (ret_fcntl == -1) { |
b3530820 JG |
1993 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
1994 | goto error_fatal; | |
1995 | } | |
1996 | DBG("Channel monitor pipe set as non-blocking"); | |
1997 | } else { | |
1998 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
1999 | } | |
2000 | goto end_msg_sessiond; | |
2001 | } | |
b99a8d42 JD |
2002 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
2003 | { | |
594c7c00 | 2004 | struct lttng_consumer_channel *found_channel; |
92b7a7f8 | 2005 | uint64_t key = msg.u.rotate_channel.key; |
594c7c00 | 2006 | int ret_send_status; |
b99a8d42 | 2007 | |
594c7c00 SM |
2008 | found_channel = consumer_find_channel(key); |
2009 | if (!found_channel) { | |
92b7a7f8 MD |
2010 | DBG("Channel %" PRIu64 " not found", key); |
2011 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2012 | } else { | |
594c7c00 SM |
2013 | int rotate_channel; |
2014 | ||
92b7a7f8 MD |
2015 | /* |
2016 | * Sample the rotate position of all the streams in | |
2017 | * this channel. | |
2018 | */ | |
594c7c00 SM |
2019 | rotate_channel = lttng_consumer_rotate_channel( |
2020 | found_channel, key, | |
f46376a1 | 2021 | msg.u.rotate_channel.relayd_id); |
594c7c00 | 2022 | if (rotate_channel < 0) { |
92b7a7f8 MD |
2023 | ERR("Rotate channel failed"); |
2024 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2025 | } | |
b99a8d42 | 2026 | |
92b7a7f8 MD |
2027 | health_code_update(); |
2028 | } | |
594c7c00 SM |
2029 | |
2030 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2031 | if (ret_send_status < 0) { | |
b99a8d42 | 2032 | /* Somehow, the session daemon is not responding anymore. */ |
41c7a76d | 2033 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2034 | } |
2035 | ||
2036 | /* | |
2037 | * Rotate the streams that are ready right now. | |
2038 | * FIXME: this is a second consecutive iteration over the | |
2039 | * streams in a channel, there is probably a better way to | |
2040 | * handle this, but it needs to be after the | |
2041 | * consumer_send_status_msg() call. | |
2042 | */ | |
594c7c00 SM |
2043 | if (found_channel) { |
2044 | int ret_rotate_read_streams; | |
2045 | ||
2046 | ret_rotate_read_streams = | |
2047 | lttng_consumer_rotate_ready_streams( | |
f46376a1 | 2048 | found_channel, key); |
594c7c00 | 2049 | if (ret_rotate_read_streams < 0) { |
92b7a7f8 MD |
2050 | ERR("Rotate channel failed"); |
2051 | } | |
b99a8d42 JD |
2052 | } |
2053 | break; | |
41c7a76d JG |
2054 | end_rotate_channel_nosignal: |
2055 | goto end_nosignal; | |
b99a8d42 | 2056 | } |
5f3aff8b MD |
2057 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
2058 | { | |
594c7c00 | 2059 | struct lttng_consumer_channel *found_channel; |
5f3aff8b | 2060 | uint64_t key = msg.u.clear_channel.key; |
594c7c00 | 2061 | int ret_send_status; |
5f3aff8b | 2062 | |
594c7c00 SM |
2063 | found_channel = consumer_find_channel(key); |
2064 | if (!found_channel) { | |
5f3aff8b MD |
2065 | DBG("Channel %" PRIu64 " not found", key); |
2066 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2067 | } else { | |
594c7c00 SM |
2068 | int ret_clear_channel; |
2069 | ||
2070 | ret_clear_channel = lttng_consumer_clear_channel( | |
2071 | found_channel); | |
2072 | if (ret_clear_channel) { | |
5f3aff8b | 2073 | ERR("Clear channel failed key %" PRIu64, key); |
97535efa | 2074 | ret_code = (lttcomm_return_code) ret_clear_channel; |
5f3aff8b MD |
2075 | } |
2076 | ||
2077 | health_code_update(); | |
2078 | } | |
594c7c00 SM |
2079 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2080 | if (ret_send_status < 0) { | |
5f3aff8b MD |
2081 | /* Somehow, the session daemon is not responding anymore. */ |
2082 | goto end_nosignal; | |
2083 | } | |
2084 | break; | |
2085 | } | |
d2956687 | 2086 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2087 | { |
594c7c00 | 2088 | int ret_send_status; |
328c2fe7 | 2089 | lttng_uuid sessiond_uuid; |
594c7c00 | 2090 | |
328c2fe7 JG |
2091 | std::copy(std::begin(msg.u.init.sessiond_uuid), std::end(msg.u.init.sessiond_uuid), |
2092 | sessiond_uuid.begin()); | |
2093 | ret_code = lttng_consumer_init_command(ctx, sessiond_uuid); | |
d88744a4 | 2094 | health_code_update(); |
594c7c00 SM |
2095 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2096 | if (ret_send_status < 0) { | |
d88744a4 JD |
2097 | /* Somehow, the session daemon is not responding anymore. */ |
2098 | goto end_nosignal; | |
2099 | } | |
2100 | break; | |
2101 | } | |
d2956687 | 2102 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2103 | { |
d2956687 | 2104 | const struct lttng_credentials credentials = { |
ff588497 JR |
2105 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.uid), |
2106 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.gid), | |
d2956687 JG |
2107 | }; |
2108 | const bool is_local_trace = | |
2109 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2110 | const uint64_t relayd_id = | |
2111 | msg.u.create_trace_chunk.relayd_id.value; | |
2112 | const char *chunk_override_name = | |
2113 | *msg.u.create_trace_chunk.override_name ? | |
2114 | msg.u.create_trace_chunk.override_name : | |
2115 | NULL; | |
cbf53d23 | 2116 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 2117 | |
d2956687 JG |
2118 | /* |
2119 | * The session daemon will only provide a chunk directory file | |
2120 | * descriptor for local traces. | |
2121 | */ | |
2122 | if (is_local_trace) { | |
2123 | int chunk_dirfd; | |
594c7c00 SM |
2124 | int ret_send_status; |
2125 | ssize_t ret_recv; | |
19990ed5 | 2126 | |
d2956687 | 2127 | /* Acnowledge the reception of the command. */ |
594c7c00 SM |
2128 | ret_send_status = consumer_send_status_msg( |
2129 | sock, LTTCOMM_CONSUMERD_SUCCESS); | |
2130 | if (ret_send_status < 0) { | |
d2956687 JG |
2131 | /* Somehow, the session daemon is not responding anymore. */ |
2132 | goto end_nosignal; | |
2133 | } | |
92816cc3 | 2134 | |
5da88b0f MD |
2135 | /* |
2136 | * Receive trace chunk domain dirfd. | |
2137 | */ | |
594c7c00 SM |
2138 | ret_recv = lttcomm_recv_fds_unix_sock( |
2139 | sock, &chunk_dirfd, 1); | |
2140 | if (ret_recv != sizeof(chunk_dirfd)) { | |
5da88b0f | 2141 | ERR("Failed to receive trace chunk domain directory file descriptor"); |
d2956687 JG |
2142 | goto error_fatal; |
2143 | } | |
92816cc3 | 2144 | |
5da88b0f | 2145 | DBG("Received trace chunk domain directory fd (%d)", |
d2956687 | 2146 | chunk_dirfd); |
cbf53d23 | 2147 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 2148 | chunk_dirfd); |
cbf53d23 | 2149 | if (!chunk_directory_handle) { |
5da88b0f | 2150 | ERR("Failed to initialize chunk domain directory handle from directory file descriptor"); |
d2956687 JG |
2151 | if (close(chunk_dirfd)) { |
2152 | PERROR("Failed to close chunk directory file descriptor"); | |
2153 | } | |
2154 | goto error_fatal; | |
2155 | } | |
92816cc3 JG |
2156 | } |
2157 | ||
d2956687 JG |
2158 | ret_code = lttng_consumer_create_trace_chunk( |
2159 | !is_local_trace ? &relayd_id : NULL, | |
2160 | msg.u.create_trace_chunk.session_id, | |
2161 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
2162 | (time_t) msg.u.create_trace_chunk |
2163 | .creation_timestamp, | |
d2956687 | 2164 | chunk_override_name, |
e5add6d0 JG |
2165 | msg.u.create_trace_chunk.credentials.is_set ? |
2166 | &credentials : | |
2167 | NULL, | |
cbf53d23 JG |
2168 | chunk_directory_handle); |
2169 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 2170 | goto end_msg_sessiond; |
00fb02ac | 2171 | } |
d2956687 | 2172 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2173 | { |
bbc4768c | 2174 | enum lttng_trace_chunk_command_type close_command = |
97535efa | 2175 | (lttng_trace_chunk_command_type) |
bbc4768c | 2176 | msg.u.close_trace_chunk.close_command.value; |
d2956687 JG |
2177 | const uint64_t relayd_id = |
2178 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f | 2179 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
d00fb490 | 2180 | char closed_trace_chunk_path[LTTNG_PATH_MAX] = {}; |
ecd1a12f | 2181 | int ret; |
d2956687 JG |
2182 | |
2183 | ret_code = lttng_consumer_close_trace_chunk( | |
2184 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
2185 | &relayd_id : |
2186 | NULL, | |
d2956687 JG |
2187 | msg.u.close_trace_chunk.session_id, |
2188 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
2189 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2190 | msg.u.close_trace_chunk.close_command.is_set ? | |
2191 | &close_command : | |
ecd1a12f MD |
2192 | NULL, closed_trace_chunk_path); |
2193 | reply.ret_code = ret_code; | |
2194 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2195 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2196 | if (ret != sizeof(reply)) { | |
2197 | goto error_fatal; | |
2198 | } | |
2199 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2200 | reply.path_length); | |
2201 | if (ret != reply.path_length) { | |
2202 | goto error_fatal; | |
2203 | } | |
2204 | goto end_nosignal; | |
a1ae2ea5 | 2205 | } |
d2956687 | 2206 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 2207 | { |
d2956687 JG |
2208 | const uint64_t relayd_id = |
2209 | msg.u.trace_chunk_exists.relayd_id.value; | |
2210 | ||
2211 | ret_code = lttng_consumer_trace_chunk_exists( | |
2212 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2213 | &relayd_id : NULL, | |
2214 | msg.u.trace_chunk_exists.session_id, | |
2215 | msg.u.trace_chunk_exists.chunk_id); | |
2216 | goto end_msg_sessiond; | |
04ed9e10 JG |
2217 | } |
2218 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: | |
2219 | { | |
2220 | const uint64_t key = msg.u.open_channel_packets.key; | |
594c7c00 | 2221 | struct lttng_consumer_channel *found_channel = |
04ed9e10 JG |
2222 | consumer_find_channel(key); |
2223 | ||
594c7c00 SM |
2224 | if (found_channel) { |
2225 | pthread_mutex_lock(&found_channel->lock); | |
2226 | ret_code = lttng_consumer_open_channel_packets( | |
2227 | found_channel); | |
2228 | pthread_mutex_unlock(&found_channel->lock); | |
04ed9e10 JG |
2229 | } else { |
2230 | /* | |
2231 | * The channel could have disappeared in per-pid | |
2232 | * buffering mode. | |
2233 | */ | |
2234 | DBG("Channel %" PRIu64 " not found", key); | |
2235 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2236 | } | |
2237 | ||
2238 | health_code_update(); | |
2239 | goto end_msg_sessiond; | |
3654ed19 | 2240 | } |
3bd1e081 MD |
2241 | default: |
2242 | break; | |
2243 | } | |
3f8e211f | 2244 | |
3bd1e081 | 2245 | end_nosignal: |
4cbc1a04 DG |
2246 | /* |
2247 | * Return 1 to indicate success since the 0 value can be a socket | |
2248 | * shutdown during the recv() or send() call. | |
2249 | */ | |
594c7c00 | 2250 | ret_func = 1; |
f3a1fc7b | 2251 | goto end; |
ffe60014 DG |
2252 | |
2253 | end_msg_sessiond: | |
2254 | /* | |
2255 | * The returned value here is not useful since either way we'll return 1 to | |
2256 | * the caller because the session daemon socket management is done | |
2257 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2258 | */ | |
594c7c00 SM |
2259 | { |
2260 | int ret_send_status; | |
2261 | ||
2262 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2263 | if (ret_send_status < 0) { | |
2264 | goto error_fatal; | |
2265 | } | |
489f70e9 | 2266 | } |
594c7c00 SM |
2267 | |
2268 | ret_func = 1; | |
f3a1fc7b | 2269 | goto end; |
9ce5646a | 2270 | |
ffe60014 DG |
2271 | end_channel_error: |
2272 | if (channel) { | |
a00932c8 | 2273 | consumer_del_channel(channel); |
ffe60014 DG |
2274 | } |
2275 | /* We have to send a status channel message indicating an error. */ | |
594c7c00 SM |
2276 | { |
2277 | int ret_send_status; | |
2278 | ||
2279 | ret_send_status = consumer_send_status_channel(sock, NULL); | |
2280 | if (ret_send_status < 0) { | |
2281 | /* Stop everything if session daemon can not be notified. */ | |
2282 | goto error_fatal; | |
2283 | } | |
ffe60014 | 2284 | } |
594c7c00 SM |
2285 | |
2286 | ret_func = 1; | |
f3a1fc7b | 2287 | goto end; |
9ce5646a | 2288 | |
ffe60014 | 2289 | error_fatal: |
ffe60014 | 2290 | /* This will issue a consumer stop. */ |
594c7c00 | 2291 | ret_func = -1; |
f3a1fc7b JG |
2292 | goto end; |
2293 | ||
2294 | end: | |
2295 | rcu_read_unlock(); | |
2296 | health_code_update(); | |
594c7c00 | 2297 | return ret_func; |
3bd1e081 MD |
2298 | } |
2299 | ||
881fc67f MD |
2300 | int lttng_ust_flush_buffer(struct lttng_consumer_stream *stream, |
2301 | int producer_active) | |
fc6d7a51 | 2302 | { |
a0377dfe FD |
2303 | LTTNG_ASSERT(stream); |
2304 | LTTNG_ASSERT(stream->ustream); | |
fc6d7a51 | 2305 | |
881fc67f | 2306 | return lttng_ust_ctl_flush_buffer(stream->ustream, producer_active); |
fc6d7a51 JD |
2307 | } |
2308 | ||
ffe60014 | 2309 | /* |
e9404c27 | 2310 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2311 | * |
2312 | * Returns 0 on success, < 0 on error | |
2313 | */ | |
2314 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2315 | { |
a0377dfe FD |
2316 | LTTNG_ASSERT(stream); |
2317 | LTTNG_ASSERT(stream->ustream); | |
ffe60014 | 2318 | |
b623cb6a | 2319 | return lttng_ust_ctl_snapshot(stream->ustream); |
3bd1e081 MD |
2320 | } |
2321 | ||
e9404c27 JG |
2322 | /* |
2323 | * Sample consumed and produced positions for a specific stream. | |
2324 | * | |
2325 | * Returns 0 on success, < 0 on error. | |
2326 | */ | |
2327 | int lttng_ustconsumer_sample_snapshot_positions( | |
2328 | struct lttng_consumer_stream *stream) | |
2329 | { | |
a0377dfe FD |
2330 | LTTNG_ASSERT(stream); |
2331 | LTTNG_ASSERT(stream->ustream); | |
e9404c27 | 2332 | |
b623cb6a | 2333 | return lttng_ust_ctl_snapshot_sample_positions(stream->ustream); |
e9404c27 JG |
2334 | } |
2335 | ||
ffe60014 DG |
2336 | /* |
2337 | * Get the produced position | |
2338 | * | |
2339 | * Returns 0 on success, < 0 on error | |
2340 | */ | |
2341 | int lttng_ustconsumer_get_produced_snapshot( | |
2342 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2343 | { |
a0377dfe FD |
2344 | LTTNG_ASSERT(stream); |
2345 | LTTNG_ASSERT(stream->ustream); | |
2346 | LTTNG_ASSERT(pos); | |
7a57cf92 | 2347 | |
b623cb6a | 2348 | return lttng_ust_ctl_snapshot_get_produced(stream->ustream, pos); |
ffe60014 | 2349 | } |
7a57cf92 | 2350 | |
10a50311 JD |
2351 | /* |
2352 | * Get the consumed position | |
2353 | * | |
2354 | * Returns 0 on success, < 0 on error | |
2355 | */ | |
2356 | int lttng_ustconsumer_get_consumed_snapshot( | |
2357 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2358 | { | |
a0377dfe FD |
2359 | LTTNG_ASSERT(stream); |
2360 | LTTNG_ASSERT(stream->ustream); | |
2361 | LTTNG_ASSERT(pos); | |
10a50311 | 2362 | |
b623cb6a | 2363 | return lttng_ust_ctl_snapshot_get_consumed(stream->ustream, pos); |
10a50311 JD |
2364 | } |
2365 | ||
881fc67f | 2366 | int lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
84a182ce DG |
2367 | int producer) |
2368 | { | |
a0377dfe FD |
2369 | LTTNG_ASSERT(stream); |
2370 | LTTNG_ASSERT(stream->ustream); | |
84a182ce | 2371 | |
881fc67f | 2372 | return lttng_ust_ctl_flush_buffer(stream->ustream, producer); |
84a182ce DG |
2373 | } |
2374 | ||
881fc67f | 2375 | int lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
214f70e0 | 2376 | { |
a0377dfe FD |
2377 | LTTNG_ASSERT(stream); |
2378 | LTTNG_ASSERT(stream->ustream); | |
214f70e0 | 2379 | |
881fc67f | 2380 | return lttng_ust_ctl_clear_buffer(stream->ustream); |
214f70e0 JR |
2381 | } |
2382 | ||
84a182ce DG |
2383 | int lttng_ustconsumer_get_current_timestamp( |
2384 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2385 | { | |
a0377dfe FD |
2386 | LTTNG_ASSERT(stream); |
2387 | LTTNG_ASSERT(stream->ustream); | |
2388 | LTTNG_ASSERT(ts); | |
84a182ce | 2389 | |
b623cb6a | 2390 | return lttng_ust_ctl_get_current_timestamp(stream->ustream, ts); |
84a182ce DG |
2391 | } |
2392 | ||
fb83fe64 JD |
2393 | int lttng_ustconsumer_get_sequence_number( |
2394 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2395 | { | |
a0377dfe FD |
2396 | LTTNG_ASSERT(stream); |
2397 | LTTNG_ASSERT(stream->ustream); | |
2398 | LTTNG_ASSERT(seq); | |
fb83fe64 | 2399 | |
b623cb6a | 2400 | return lttng_ust_ctl_get_sequence_number(stream->ustream, seq); |
fb83fe64 JD |
2401 | } |
2402 | ||
ffe60014 | 2403 | /* |
0dd01979 | 2404 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2405 | */ |
2406 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2407 | { | |
a0377dfe FD |
2408 | LTTNG_ASSERT(stream); |
2409 | LTTNG_ASSERT(stream->ustream); | |
2c1dd183 | 2410 | |
0dd01979 MD |
2411 | pthread_mutex_lock(&stream->lock); |
2412 | if (!stream->quiescent) { | |
881fc67f MD |
2413 | if (lttng_ust_ctl_flush_buffer(stream->ustream, 0) < 0) { |
2414 | ERR("Failed to flush buffer on stream hang-up"); | |
2415 | } else { | |
2416 | stream->quiescent = true; | |
2417 | } | |
0dd01979 | 2418 | } |
d9ab8c66 | 2419 | |
ffe60014 | 2420 | stream->hangup_flush_done = 1; |
d9ab8c66 | 2421 | pthread_mutex_unlock(&stream->lock); |
ffe60014 | 2422 | } |
ee77a7b0 | 2423 | |
ffe60014 DG |
2424 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2425 | { | |
4628484a MD |
2426 | int i; |
2427 | ||
a0377dfe FD |
2428 | LTTNG_ASSERT(chan); |
2429 | LTTNG_ASSERT(chan->uchan); | |
2430 | LTTNG_ASSERT(chan->buffer_credentials.is_set); | |
e316aad5 | 2431 | |
ea88ca2a MD |
2432 | if (chan->switch_timer_enabled == 1) { |
2433 | consumer_timer_switch_stop(chan); | |
2434 | } | |
4628484a MD |
2435 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2436 | int ret; | |
2437 | ||
2438 | ret = close(chan->stream_fds[i]); | |
2439 | if (ret) { | |
2440 | PERROR("close"); | |
2441 | } | |
2442 | if (chan->shm_path[0]) { | |
2443 | char shm_path[PATH_MAX]; | |
2444 | ||
2445 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2446 | if (ret) { | |
2447 | ERR("Cannot get stream shm path"); | |
2448 | } | |
d2956687 | 2449 | ret = run_as_unlink(shm_path, |
ff588497 JR |
2450 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2451 | chan->buffer_credentials)), | |
2452 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2453 | chan->buffer_credentials))); | |
4628484a | 2454 | if (ret) { |
4628484a MD |
2455 | PERROR("unlink %s", shm_path); |
2456 | } | |
2457 | } | |
2458 | } | |
3bd1e081 MD |
2459 | } |
2460 | ||
b83e03c4 MD |
2461 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2462 | { | |
a0377dfe FD |
2463 | LTTNG_ASSERT(chan); |
2464 | LTTNG_ASSERT(chan->uchan); | |
2465 | LTTNG_ASSERT(chan->buffer_credentials.is_set); | |
b83e03c4 MD |
2466 | |
2467 | consumer_metadata_cache_destroy(chan); | |
b623cb6a | 2468 | lttng_ust_ctl_destroy_channel(chan->uchan); |
ea853771 JR |
2469 | /* Try to rmdir all directories under shm_path root. */ |
2470 | if (chan->root_shm_path[0]) { | |
602766ec | 2471 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
ff588497 JR |
2472 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2473 | chan->buffer_credentials)), | |
2474 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2475 | chan->buffer_credentials)), | |
f75c5439 | 2476 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
ea853771 | 2477 | } |
b83e03c4 MD |
2478 | free(chan->stream_fds); |
2479 | } | |
2480 | ||
3bd1e081 MD |
2481 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2482 | { | |
a0377dfe FD |
2483 | LTTNG_ASSERT(stream); |
2484 | LTTNG_ASSERT(stream->ustream); | |
d41f73b7 | 2485 | |
ea88ca2a MD |
2486 | if (stream->chan->switch_timer_enabled == 1) { |
2487 | consumer_timer_switch_stop(stream->chan); | |
2488 | } | |
b623cb6a | 2489 | lttng_ust_ctl_destroy_stream(stream->ustream); |
ffe60014 | 2490 | } |
d41f73b7 | 2491 | |
6d574024 DG |
2492 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2493 | { | |
a0377dfe FD |
2494 | LTTNG_ASSERT(stream); |
2495 | LTTNG_ASSERT(stream->ustream); | |
6d574024 | 2496 | |
b623cb6a | 2497 | return lttng_ust_ctl_stream_get_wakeup_fd(stream->ustream); |
6d574024 DG |
2498 | } |
2499 | ||
2500 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2501 | { | |
a0377dfe FD |
2502 | LTTNG_ASSERT(stream); |
2503 | LTTNG_ASSERT(stream->ustream); | |
6d574024 | 2504 | |
b623cb6a | 2505 | return lttng_ust_ctl_stream_close_wakeup_fd(stream->ustream); |
6d574024 DG |
2506 | } |
2507 | ||
94d49140 JD |
2508 | /* |
2509 | * Write up to one packet from the metadata cache to the channel. | |
2510 | * | |
577eea73 JG |
2511 | * Returns the number of bytes pushed from the cache into the ring buffer, or a |
2512 | * negative value on error. | |
94d49140 JD |
2513 | */ |
2514 | static | |
2515 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2516 | { | |
2517 | ssize_t write_len; | |
2518 | int ret; | |
2519 | ||
2520 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2521 | if (stream->chan->metadata_cache->contents.size == |
2522 | stream->ust_metadata_pushed) { | |
55954e07 JG |
2523 | /* |
2524 | * In the context of a user space metadata channel, a | |
2525 | * change in version can be detected in two ways: | |
2526 | * 1) During the pre-consume of the `read_subbuffer` loop, | |
2527 | * 2) When populating the metadata ring buffer (i.e. here). | |
2528 | * | |
2529 | * This function is invoked when there is no metadata | |
2530 | * available in the ring-buffer. If all data was consumed | |
2531 | * up to the size of the metadata cache, there is no metadata | |
2532 | * to insert in the ring-buffer. | |
2533 | * | |
2534 | * However, the metadata version could still have changed (a | |
2535 | * regeneration without any new data will yield the same cache | |
2536 | * size). | |
2537 | * | |
2538 | * The cache's version is checked for a version change and the | |
2539 | * consumed position is reset if one occurred. | |
2540 | * | |
2541 | * This check is only necessary for the user space domain as | |
2542 | * it has to manage the cache explicitly. If this reset was not | |
2543 | * performed, no metadata would be consumed (and no reset would | |
2544 | * occur as part of the pre-consume) until the metadata size | |
2545 | * exceeded the cache size. | |
2546 | */ | |
2547 | if (stream->metadata_version != | |
2548 | stream->chan->metadata_cache->version) { | |
2549 | metadata_stream_reset_cache_consumed_position(stream); | |
2550 | consumer_stream_metadata_set_version(stream, | |
2551 | stream->chan->metadata_cache->version); | |
2552 | } else { | |
2553 | ret = 0; | |
2554 | goto end; | |
2555 | } | |
94d49140 JD |
2556 | } |
2557 | ||
b623cb6a | 2558 | write_len = lttng_ust_ctl_write_one_packet_to_channel(stream->chan->uchan, |
9eac9828 JG |
2559 | &stream->chan->metadata_cache->contents.data[stream->ust_metadata_pushed], |
2560 | stream->chan->metadata_cache->contents.size - | |
2561 | stream->ust_metadata_pushed); | |
a0377dfe | 2562 | LTTNG_ASSERT(write_len != 0); |
94d49140 JD |
2563 | if (write_len < 0) { |
2564 | ERR("Writing one metadata packet"); | |
f5ba75b4 | 2565 | ret = write_len; |
94d49140 JD |
2566 | goto end; |
2567 | } | |
2568 | stream->ust_metadata_pushed += write_len; | |
2569 | ||
a0377dfe | 2570 | LTTNG_ASSERT(stream->chan->metadata_cache->contents.size >= |
94d49140 JD |
2571 | stream->ust_metadata_pushed); |
2572 | ret = write_len; | |
2573 | ||
0d88e046 JG |
2574 | /* |
2575 | * Switch packet (but don't open the next one) on every commit of | |
2576 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2577 | * if needed), the stream is "quiescent" after this commit. | |
2578 | */ | |
881fc67f | 2579 | if (lttng_ust_ctl_flush_buffer(stream->ustream, 1)) { |
edb555b5 | 2580 | ERR("Failed to flush buffer while committing one metadata packet"); |
881fc67f MD |
2581 | ret = -EIO; |
2582 | } else { | |
2583 | stream->quiescent = true; | |
2584 | } | |
94d49140 JD |
2585 | end: |
2586 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2587 | return ret; | |
2588 | } | |
2589 | ||
309167d2 | 2590 | |
94d49140 JD |
2591 | /* |
2592 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2593 | * metadata thread can consumer them. | |
2594 | * | |
c585821b MD |
2595 | * Metadata stream lock is held here, but we need to release it when |
2596 | * interacting with sessiond, else we cause a deadlock with live | |
2597 | * awaiting on metadata to be pushed out. | |
94d49140 | 2598 | * |
cdb72e4e | 2599 | * The RCU read side lock must be held by the caller. |
94d49140 | 2600 | */ |
577eea73 JG |
2601 | enum sync_metadata_status lttng_ustconsumer_sync_metadata( |
2602 | struct lttng_consumer_local_data *ctx, | |
cdb72e4e | 2603 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2604 | { |
2605 | int ret; | |
577eea73 | 2606 | enum sync_metadata_status status; |
cdb72e4e | 2607 | struct lttng_consumer_channel *metadata_channel; |
94d49140 | 2608 | |
a0377dfe FD |
2609 | LTTNG_ASSERT(ctx); |
2610 | LTTNG_ASSERT(metadata_stream); | |
48b7cdc2 | 2611 | ASSERT_RCU_READ_LOCKED(); |
94d49140 | 2612 | |
cdb72e4e JG |
2613 | metadata_channel = metadata_stream->chan; |
2614 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2615 | /* |
2616 | * Request metadata from the sessiond, but don't wait for the flush | |
2617 | * because we locked the metadata thread. | |
2618 | */ | |
cdb72e4e JG |
2619 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2620 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 | 2621 | if (ret < 0) { |
577eea73 | 2622 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
2623 | goto end; |
2624 | } | |
2625 | ||
cdb72e4e JG |
2626 | /* |
2627 | * The metadata stream and channel can be deleted while the | |
2628 | * metadata stream lock was released. The streamed is checked | |
2629 | * for deletion before we use it further. | |
2630 | * | |
2631 | * Note that it is safe to access a logically-deleted stream since its | |
2632 | * existence is still guaranteed by the RCU read side lock. However, | |
2633 | * it should no longer be used. The close/deletion of the metadata | |
2634 | * channel and stream already guarantees that all metadata has been | |
2635 | * consumed. Therefore, there is nothing left to do in this function. | |
2636 | */ | |
2637 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2638 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2639 | metadata_stream->key); | |
577eea73 | 2640 | status = SYNC_METADATA_STATUS_NO_DATA; |
cdb72e4e JG |
2641 | goto end; |
2642 | } | |
2643 | ||
2644 | ret = commit_one_metadata_packet(metadata_stream); | |
577eea73 JG |
2645 | if (ret < 0) { |
2646 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2647 | goto end; |
2648 | } else if (ret > 0) { | |
577eea73 JG |
2649 | status = SYNC_METADATA_STATUS_NEW_DATA; |
2650 | } else /* ret == 0 */ { | |
2651 | status = SYNC_METADATA_STATUS_NO_DATA; | |
2652 | goto end; | |
94d49140 JD |
2653 | } |
2654 | ||
b623cb6a | 2655 | ret = lttng_ust_ctl_snapshot(metadata_stream->ustream); |
94d49140 | 2656 | if (ret < 0) { |
577eea73 JG |
2657 | ERR("Failed to take a snapshot of the metadata ring-buffer positions, ret = %d", ret); |
2658 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2659 | goto end; |
2660 | } | |
2661 | ||
94d49140 | 2662 | end: |
577eea73 | 2663 | return status; |
94d49140 JD |
2664 | } |
2665 | ||
02b3d176 DG |
2666 | /* |
2667 | * Return 0 on success else a negative value. | |
2668 | */ | |
2669 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2670 | struct lttng_consumer_local_data *ctx) | |
2671 | { | |
2672 | int ret; | |
b623cb6a | 2673 | struct lttng_ust_ctl_consumer_stream *ustream; |
02b3d176 | 2674 | |
a0377dfe FD |
2675 | LTTNG_ASSERT(stream); |
2676 | LTTNG_ASSERT(ctx); | |
02b3d176 DG |
2677 | |
2678 | ustream = stream->ustream; | |
2679 | ||
2680 | /* | |
2681 | * First, we are going to check if there is a new subbuffer available | |
2682 | * before reading the stream wait_fd. | |
2683 | */ | |
2684 | /* Get the next subbuffer */ | |
b623cb6a | 2685 | ret = lttng_ust_ctl_get_next_subbuf(ustream); |
02b3d176 DG |
2686 | if (ret) { |
2687 | /* No more data found, flag the stream. */ | |
2688 | stream->has_data = 0; | |
2689 | ret = 0; | |
2690 | goto end; | |
2691 | } | |
2692 | ||
b623cb6a | 2693 | ret = lttng_ust_ctl_put_subbuf(ustream); |
a0377dfe | 2694 | LTTNG_ASSERT(!ret); |
02b3d176 DG |
2695 | |
2696 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2697 | stream->has_data = 1; | |
2698 | ||
2699 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2700 | ssize_t writelen; | |
2701 | ||
2702 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2703 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2704 | ret = writelen; | |
2705 | goto end; | |
2706 | } | |
2707 | ||
2708 | /* The wake up pipe has been notified. */ | |
2709 | ctx->has_wakeup = 1; | |
2710 | } | |
2711 | ret = 0; | |
2712 | ||
2713 | end: | |
2714 | return ret; | |
2715 | } | |
2716 | ||
6f9449c2 | 2717 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2718 | { |
6f9449c2 | 2719 | int ret = 0; |
fb83fe64 | 2720 | |
fb83fe64 | 2721 | /* |
6f9449c2 JG |
2722 | * We can consume the 1 byte written into the wait_fd by |
2723 | * UST. Don't trigger error if we cannot read this one byte | |
2724 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2725 | * | |
2726 | * This is only done when the stream is monitored by a thread, | |
2727 | * before the flush is done after a hangup and if the stream | |
2728 | * is not flagged with data since there might be nothing to | |
2729 | * consume in the wait fd but still have data available | |
2730 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2731 | */ |
6f9449c2 JG |
2732 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2733 | char dummy; | |
2734 | ssize_t readlen; | |
2735 | ||
2736 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2737 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2738 | ret = readlen; | |
2739 | } | |
fb83fe64 | 2740 | } |
fb83fe64 | 2741 | |
6f9449c2 JG |
2742 | return ret; |
2743 | } | |
2744 | ||
2745 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2746 | struct stream_subbuffer *subbuf) | |
2747 | { | |
2748 | int ret; | |
2749 | ||
b623cb6a | 2750 | ret = lttng_ust_ctl_get_subbuf_size( |
6f9449c2 JG |
2751 | stream->ustream, &subbuf->info.data.subbuf_size); |
2752 | if (ret) { | |
fb83fe64 JD |
2753 | goto end; |
2754 | } | |
6f9449c2 | 2755 | |
b623cb6a | 2756 | ret = lttng_ust_ctl_get_padded_subbuf_size( |
6f9449c2 JG |
2757 | stream->ustream, &subbuf->info.data.padded_subbuf_size); |
2758 | if (ret) { | |
2759 | goto end; | |
fb83fe64 | 2760 | } |
fb83fe64 JD |
2761 | |
2762 | end: | |
2763 | return ret; | |
2764 | } | |
2765 | ||
6f9449c2 JG |
2766 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2767 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2768 | { |
6f9449c2 | 2769 | int ret; |
ffe60014 | 2770 | |
6f9449c2 JG |
2771 | ret = extract_common_subbuffer_info(stream, subbuf); |
2772 | if (ret) { | |
2773 | goto end; | |
2774 | } | |
d41f73b7 | 2775 | |
55954e07 | 2776 | subbuf->info.metadata.version = stream->metadata_version; |
ffe60014 | 2777 | |
6f9449c2 JG |
2778 | end: |
2779 | return ret; | |
2780 | } | |
d41f73b7 | 2781 | |
6f9449c2 JG |
2782 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2783 | struct stream_subbuffer *subbuf) | |
2784 | { | |
2785 | int ret; | |
c617c0c6 | 2786 | |
6f9449c2 JG |
2787 | ret = extract_common_subbuffer_info(stream, subbuf); |
2788 | if (ret) { | |
2789 | goto end; | |
02d02e31 JD |
2790 | } |
2791 | ||
b623cb6a | 2792 | ret = lttng_ust_ctl_get_packet_size( |
6f9449c2 JG |
2793 | stream->ustream, &subbuf->info.data.packet_size); |
2794 | if (ret < 0) { | |
2795 | PERROR("Failed to get sub-buffer packet size"); | |
2796 | goto end; | |
2797 | } | |
04ef1097 | 2798 | |
b623cb6a | 2799 | ret = lttng_ust_ctl_get_content_size( |
6f9449c2 JG |
2800 | stream->ustream, &subbuf->info.data.content_size); |
2801 | if (ret < 0) { | |
2802 | PERROR("Failed to get sub-buffer content size"); | |
2803 | goto end; | |
d41f73b7 | 2804 | } |
309167d2 | 2805 | |
b623cb6a | 2806 | ret = lttng_ust_ctl_get_timestamp_begin( |
6f9449c2 JG |
2807 | stream->ustream, &subbuf->info.data.timestamp_begin); |
2808 | if (ret < 0) { | |
2809 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2810 | goto end; | |
2811 | } | |
fb83fe64 | 2812 | |
b623cb6a | 2813 | ret = lttng_ust_ctl_get_timestamp_end( |
6f9449c2 JG |
2814 | stream->ustream, &subbuf->info.data.timestamp_end); |
2815 | if (ret < 0) { | |
2816 | PERROR("Failed to get sub-buffer end timestamp"); | |
2817 | goto end; | |
2818 | } | |
2819 | ||
b623cb6a | 2820 | ret = lttng_ust_ctl_get_events_discarded( |
6f9449c2 JG |
2821 | stream->ustream, &subbuf->info.data.events_discarded); |
2822 | if (ret) { | |
2823 | PERROR("Failed to get sub-buffer events discarded count"); | |
2824 | goto end; | |
2825 | } | |
2826 | ||
b623cb6a | 2827 | ret = lttng_ust_ctl_get_sequence_number(stream->ustream, |
6f9449c2 JG |
2828 | &subbuf->info.data.sequence_number.value); |
2829 | if (ret) { | |
2830 | /* May not be supported by older LTTng-modules. */ | |
2831 | if (ret != -ENOTTY) { | |
2832 | PERROR("Failed to get sub-buffer sequence number"); | |
2833 | goto end; | |
fb83fe64 | 2834 | } |
1c20f0e2 | 2835 | } else { |
6f9449c2 | 2836 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2837 | } |
2838 | ||
b623cb6a | 2839 | ret = lttng_ust_ctl_get_stream_id( |
6f9449c2 JG |
2840 | stream->ustream, &subbuf->info.data.stream_id); |
2841 | if (ret < 0) { | |
2842 | PERROR("Failed to get stream id"); | |
2843 | goto end; | |
2844 | } | |
1d4dfdef | 2845 | |
b623cb6a | 2846 | ret = lttng_ust_ctl_get_instance_id(stream->ustream, |
6f9449c2 JG |
2847 | &subbuf->info.data.stream_instance_id.value); |
2848 | if (ret) { | |
2849 | /* May not be supported by older LTTng-modules. */ | |
2850 | if (ret != -ENOTTY) { | |
2851 | PERROR("Failed to get stream instance id"); | |
2852 | goto end; | |
2853 | } | |
2854 | } else { | |
2855 | subbuf->info.data.stream_instance_id.is_set = true; | |
2856 | } | |
2857 | end: | |
2858 | return ret; | |
2859 | } | |
1d4dfdef | 2860 | |
6f9449c2 JG |
2861 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2862 | struct stream_subbuffer *subbuffer) | |
2863 | { | |
2864 | int ret; | |
2865 | const char *addr; | |
1d4dfdef | 2866 | |
6f9449c2 JG |
2867 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2868 | stream, subbuffer); | |
2869 | if (ret) { | |
2870 | goto end; | |
2871 | } | |
02d02e31 | 2872 | |
6f9449c2 | 2873 | ret = get_current_subbuf_addr(stream, &addr); |
128708c3 | 2874 | if (ret) { |
6f9449c2 | 2875 | goto end; |
128708c3 JG |
2876 | } |
2877 | ||
6f9449c2 JG |
2878 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2879 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
a0377dfe | 2880 | LTTNG_ASSERT(subbuffer->buffer.buffer.data != NULL); |
6f9449c2 JG |
2881 | end: |
2882 | return ret; | |
2883 | } | |
fd424d99 | 2884 | |
b6797c8e JG |
2885 | static enum get_next_subbuffer_status get_next_subbuffer( |
2886 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
2887 | struct stream_subbuffer *subbuffer) |
2888 | { | |
2889 | int ret; | |
b6797c8e | 2890 | enum get_next_subbuffer_status status; |
331744e3 | 2891 | |
b623cb6a | 2892 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
b6797c8e JG |
2893 | switch (ret) { |
2894 | case 0: | |
2895 | status = GET_NEXT_SUBBUFFER_STATUS_OK; | |
2896 | break; | |
2897 | case -ENODATA: | |
2898 | case -EAGAIN: | |
2899 | /* | |
2900 | * The caller only expects -ENODATA when there is no data to | |
2901 | * read, but the kernel tracer returns -EAGAIN when there is | |
2902 | * currently no data for a non-finalized stream, and -ENODATA | |
2903 | * when there is no data for a finalized stream. Those can be | |
2904 | * combined into a -ENODATA return value. | |
2905 | */ | |
2906 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; | |
2907 | goto end; | |
2908 | default: | |
2909 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; | |
6f9449c2 | 2910 | goto end; |
02b3d176 DG |
2911 | } |
2912 | ||
6f9449c2 JG |
2913 | ret = get_next_subbuffer_common(stream, subbuffer); |
2914 | if (ret) { | |
b6797c8e | 2915 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
23d56598 | 2916 | goto end; |
1c20f0e2 | 2917 | } |
6f9449c2 | 2918 | end: |
b6797c8e | 2919 | return status; |
6f9449c2 | 2920 | } |
1c20f0e2 | 2921 | |
b6797c8e JG |
2922 | static enum get_next_subbuffer_status get_next_subbuffer_metadata( |
2923 | struct lttng_consumer_stream *stream, | |
6f9449c2 JG |
2924 | struct stream_subbuffer *subbuffer) |
2925 | { | |
2926 | int ret; | |
f5ba75b4 JG |
2927 | bool cache_empty; |
2928 | bool got_subbuffer; | |
2929 | bool coherent; | |
2930 | bool buffer_empty; | |
2931 | unsigned long consumed_pos, produced_pos; | |
b6797c8e | 2932 | enum get_next_subbuffer_status status; |
6f9449c2 | 2933 | |
f5ba75b4 | 2934 | do { |
b623cb6a | 2935 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
f5ba75b4 JG |
2936 | if (ret == 0) { |
2937 | got_subbuffer = true; | |
2938 | } else { | |
2939 | got_subbuffer = false; | |
2940 | if (ret != -EAGAIN) { | |
2941 | /* Fatal error. */ | |
b6797c8e | 2942 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2943 | goto end; |
2944 | } | |
c585821b MD |
2945 | } |
2946 | ||
f5ba75b4 JG |
2947 | /* |
2948 | * Determine if the cache is empty and ensure that a sub-buffer | |
2949 | * is made available if the cache is not empty. | |
2950 | */ | |
2951 | if (!got_subbuffer) { | |
2952 | ret = commit_one_metadata_packet(stream); | |
2953 | if (ret < 0 && ret != -ENOBUFS) { | |
b6797c8e | 2954 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2955 | goto end; |
2956 | } else if (ret == 0) { | |
2957 | /* Not an error, the cache is empty. */ | |
2958 | cache_empty = true; | |
b6797c8e | 2959 | status = GET_NEXT_SUBBUFFER_STATUS_NO_DATA; |
f5ba75b4 JG |
2960 | goto end; |
2961 | } else { | |
2962 | cache_empty = false; | |
2963 | } | |
2964 | } else { | |
2965 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2966 | cache_empty = stream->chan->metadata_cache->contents.size == |
2967 | stream->ust_metadata_pushed; | |
f5ba75b4 | 2968 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
94d49140 | 2969 | } |
f5ba75b4 | 2970 | } while (!got_subbuffer); |
94d49140 | 2971 | |
f5ba75b4 | 2972 | /* Populate sub-buffer infos and view. */ |
6f9449c2 JG |
2973 | ret = get_next_subbuffer_common(stream, subbuffer); |
2974 | if (ret) { | |
b6797c8e | 2975 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
6f9449c2 | 2976 | goto end; |
309167d2 | 2977 | } |
f5ba75b4 JG |
2978 | |
2979 | ret = lttng_ustconsumer_sample_snapshot_positions(stream); | |
2980 | if (ret < 0) { | |
2981 | /* | |
2982 | * -EAGAIN is not expected since we got a sub-buffer and haven't | |
2983 | * pushed the consumption position yet (on put_next). | |
2984 | */ | |
2985 | PERROR("Failed to take a snapshot of metadata buffer positions"); | |
b6797c8e | 2986 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2987 | goto end; |
2988 | } | |
2989 | ||
2990 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
2991 | if (ret) { | |
2992 | PERROR("Failed to get metadata consumed position"); | |
b6797c8e | 2993 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
2994 | goto end; |
2995 | } | |
2996 | ||
2997 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
2998 | if (ret) { | |
2999 | PERROR("Failed to get metadata produced position"); | |
b6797c8e | 3000 | status = GET_NEXT_SUBBUFFER_STATUS_ERROR; |
f5ba75b4 JG |
3001 | goto end; |
3002 | } | |
3003 | ||
3004 | /* Last sub-buffer of the ring buffer ? */ | |
3005 | buffer_empty = (consumed_pos + stream->max_sb_size) == produced_pos; | |
3006 | ||
3007 | /* | |
3008 | * The sessiond registry lock ensures that coherent units of metadata | |
3009 | * are pushed to the consumer daemon at once. Hence, if a sub-buffer is | |
3010 | * acquired, the cache is empty, and it is the only available sub-buffer | |
3011 | * available, it is safe to assume that it is "coherent". | |
3012 | */ | |
3013 | coherent = got_subbuffer && cache_empty && buffer_empty; | |
3014 | ||
3015 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
b6797c8e | 3016 | status = GET_NEXT_SUBBUFFER_STATUS_OK; |
23d56598 | 3017 | end: |
b6797c8e | 3018 | return status; |
d41f73b7 MD |
3019 | } |
3020 | ||
6f9449c2 | 3021 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
f46376a1 | 3022 | struct stream_subbuffer *subbuffer __attribute__((unused))) |
6f9449c2 | 3023 | { |
b623cb6a | 3024 | const int ret = lttng_ust_ctl_put_next_subbuf(stream->ustream); |
6f9449c2 | 3025 | |
a0377dfe | 3026 | LTTNG_ASSERT(ret == 0); |
6f9449c2 JG |
3027 | return ret; |
3028 | } | |
3029 | ||
3030 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
f46376a1 | 3031 | struct lttng_consumer_local_data *ctx __attribute__((unused))) |
6f9449c2 | 3032 | { |
8db3acaf | 3033 | ASSERT_LOCKED(stream->metadata_rdv_lock); |
6f9449c2 JG |
3034 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; |
3035 | } | |
3036 | ||
f5ba75b4 | 3037 | static int lttng_ustconsumer_set_stream_ops( |
6f9449c2 JG |
3038 | struct lttng_consumer_stream *stream) |
3039 | { | |
f5ba75b4 JG |
3040 | int ret = 0; |
3041 | ||
6f9449c2 JG |
3042 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; |
3043 | if (stream->metadata_flag) { | |
3044 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3045 | get_next_subbuffer_metadata; | |
3046 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3047 | extract_metadata_subbuffer_info; | |
3048 | stream->read_subbuffer_ops.reset_metadata = | |
55954e07 | 3049 | metadata_stream_reset_cache_consumed_position; |
f5ba75b4 JG |
3050 | if (stream->chan->is_live) { |
3051 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
3052 | ret = consumer_stream_enable_metadata_bucketization( | |
3053 | stream); | |
3054 | if (ret) { | |
3055 | goto end; | |
3056 | } | |
3057 | } | |
6f9449c2 JG |
3058 | } else { |
3059 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3060 | get_next_subbuffer; | |
3061 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3062 | extract_data_subbuffer_info; | |
3063 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
3064 | if (stream->chan->is_live) { | |
3065 | stream->read_subbuffer_ops.send_live_beacon = | |
3066 | consumer_flush_ust_index; | |
3067 | } | |
3068 | } | |
3069 | ||
3070 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
f5ba75b4 JG |
3071 | end: |
3072 | return ret; | |
6f9449c2 JG |
3073 | } |
3074 | ||
ffe60014 DG |
3075 | /* |
3076 | * Called when a stream is created. | |
fe4477ee JD |
3077 | * |
3078 | * Return 0 on success or else a negative value. | |
ffe60014 | 3079 | */ |
d41f73b7 MD |
3080 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
3081 | { | |
fe4477ee JD |
3082 | int ret; |
3083 | ||
a0377dfe | 3084 | LTTNG_ASSERT(stream); |
10a50311 | 3085 | |
d2956687 JG |
3086 | /* |
3087 | * Don't create anything if this is set for streaming or if there is | |
3088 | * no current trace chunk on the parent channel. | |
3089 | */ | |
3090 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
3091 | stream->chan->trace_chunk) { | |
3092 | ret = consumer_stream_create_output_files(stream, true); | |
3093 | if (ret) { | |
fe4477ee JD |
3094 | goto error; |
3095 | } | |
fe4477ee | 3096 | } |
6f9449c2 JG |
3097 | |
3098 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
3099 | ret = 0; |
3100 | ||
3101 | error: | |
3102 | return ret; | |
d41f73b7 | 3103 | } |
ca22feea DG |
3104 | |
3105 | /* | |
3106 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
3107 | * stream. Consumer data lock MUST be acquired before calling this function |
3108 | * and the stream lock. | |
ca22feea | 3109 | * |
6d805429 | 3110 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
3111 | * data is available for trace viewer reading. |
3112 | */ | |
6d805429 | 3113 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
3114 | { |
3115 | int ret; | |
3116 | ||
a0377dfe FD |
3117 | LTTNG_ASSERT(stream); |
3118 | LTTNG_ASSERT(stream->ustream); | |
b1316da1 | 3119 | ASSERT_LOCKED(stream->lock); |
ca22feea | 3120 | |
6d805429 | 3121 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 3122 | |
ca6b395f MD |
3123 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
3124 | ret = 0; | |
3125 | goto end; | |
3126 | } | |
3127 | ||
04ef1097 | 3128 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
3129 | uint64_t contiguous, pushed; |
3130 | ||
3131 | /* Ease our life a bit. */ | |
934ba8fd | 3132 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); |
9eac9828 | 3133 | contiguous = stream->chan->metadata_cache->contents.size; |
934ba8fd | 3134 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
e6ee4eab DG |
3135 | pushed = stream->ust_metadata_pushed; |
3136 | ||
04ef1097 MD |
3137 | /* |
3138 | * We can simply check whether all contiguously available data | |
3139 | * has been pushed to the ring buffer, since the push operation | |
3140 | * is performed within get_next_subbuf(), and because both | |
3141 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3142 | * thanks to the stream lock within | |
3143 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3144 | * whetnever ust_metadata_pushed is incremented, the associated | |
3145 | * metadata has been consumed from the metadata stream. | |
3146 | */ | |
3147 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3148 | contiguous, pushed); |
a0377dfe | 3149 | LTTNG_ASSERT(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3150 | if ((contiguous != pushed) || |
6acdf328 | 3151 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3152 | ret = 1; /* Data is pending */ |
3153 | goto end; | |
3154 | } | |
3155 | } else { | |
b623cb6a | 3156 | ret = lttng_ust_ctl_get_next_subbuf(stream->ustream); |
04ef1097 MD |
3157 | if (ret == 0) { |
3158 | /* | |
3159 | * There is still data so let's put back this | |
3160 | * subbuffer. | |
3161 | */ | |
b623cb6a | 3162 | ret = lttng_ust_ctl_put_subbuf(stream->ustream); |
a0377dfe | 3163 | LTTNG_ASSERT(ret == 0); |
04ef1097 MD |
3164 | ret = 1; /* Data is pending */ |
3165 | goto end; | |
3166 | } | |
ca22feea DG |
3167 | } |
3168 | ||
6d805429 DG |
3169 | /* Data is NOT pending so ready to be read. */ |
3170 | ret = 0; | |
ca22feea | 3171 | |
6efae65e DG |
3172 | end: |
3173 | return ret; | |
ca22feea | 3174 | } |
d88aee68 | 3175 | |
6d574024 DG |
3176 | /* |
3177 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3178 | * is the poll pipe of the metadata stream. | |
3179 | * | |
d2c82a5a | 3180 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3181 | */ |
3182 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3183 | { | |
3184 | int ret; | |
3185 | ||
a0377dfe FD |
3186 | LTTNG_ASSERT(metadata); |
3187 | LTTNG_ASSERT(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
6d574024 DG |
3188 | |
3189 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3190 | ||
3191 | if (metadata->switch_timer_enabled == 1) { | |
3192 | consumer_timer_switch_stop(metadata); | |
3193 | } | |
3194 | ||
3195 | if (!metadata->metadata_stream) { | |
3196 | goto end; | |
3197 | } | |
3198 | ||
3199 | /* | |
3200 | * Closing write side so the thread monitoring the stream wakes up if any | |
3201 | * and clean the metadata stream. | |
3202 | */ | |
3203 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3204 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3205 | if (ret < 0) { | |
3206 | PERROR("closing metadata pipe write side"); | |
3207 | } | |
3208 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3209 | } | |
3210 | ||
3211 | end: | |
3212 | return; | |
3213 | } | |
3214 | ||
d88aee68 DG |
3215 | /* |
3216 | * Close every metadata stream wait fd of the metadata hash table. This | |
3217 | * function MUST be used very carefully so not to run into a race between the | |
3218 | * metadata thread handling streams and this function closing their wait fd. | |
3219 | * | |
3220 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3221 | * producer so calling this is safe because we are assured that no state change | |
3222 | * can occur in the metadata thread for the streams in the hash table. | |
3223 | */ | |
6d574024 | 3224 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3225 | { |
d88aee68 DG |
3226 | struct lttng_ht_iter iter; |
3227 | struct lttng_consumer_stream *stream; | |
3228 | ||
a0377dfe FD |
3229 | LTTNG_ASSERT(metadata_ht); |
3230 | LTTNG_ASSERT(metadata_ht->ht); | |
d88aee68 DG |
3231 | |
3232 | DBG("UST consumer closing all metadata streams"); | |
3233 | ||
3234 | rcu_read_lock(); | |
3235 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3236 | node.node) { | |
9ce5646a MD |
3237 | |
3238 | health_code_update(); | |
3239 | ||
be2b50c7 | 3240 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3241 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3242 | pthread_mutex_unlock(&stream->chan->lock); |
3243 | ||
d88aee68 DG |
3244 | } |
3245 | rcu_read_unlock(); | |
3246 | } | |
d8ef542d MD |
3247 | |
3248 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3249 | { | |
3250 | int ret; | |
3251 | ||
b623cb6a | 3252 | ret = lttng_ust_ctl_stream_close_wakeup_fd(stream->ustream); |
d8ef542d MD |
3253 | if (ret < 0) { |
3254 | ERR("Unable to close wakeup fd"); | |
3255 | } | |
3256 | } | |
331744e3 | 3257 | |
f666ae70 MD |
3258 | /* |
3259 | * Please refer to consumer-timer.c before adding any lock within this | |
3260 | * function or any of its callees. Timers have a very strict locking | |
3261 | * semantic with respect to teardown. Failure to respect this semantic | |
3262 | * introduces deadlocks. | |
c585821b MD |
3263 | * |
3264 | * DON'T hold the metadata lock when calling this function, else this | |
3265 | * can cause deadlock involving consumer awaiting for metadata to be | |
3266 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3267 | */ |
331744e3 | 3268 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3269 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3270 | { |
3271 | struct lttcomm_metadata_request_msg request; | |
3272 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3273 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3274 | uint64_t len, key, offset, version; |
331744e3 JD |
3275 | int ret; |
3276 | ||
a0377dfe FD |
3277 | LTTNG_ASSERT(channel); |
3278 | LTTNG_ASSERT(channel->metadata_cache); | |
331744e3 | 3279 | |
53efb85a MD |
3280 | memset(&request, 0, sizeof(request)); |
3281 | ||
331744e3 | 3282 | /* send the metadata request to sessiond */ |
fa29bfbf | 3283 | switch (the_consumer_data.type) { |
331744e3 JD |
3284 | case LTTNG_CONSUMER64_UST: |
3285 | request.bits_per_long = 64; | |
3286 | break; | |
3287 | case LTTNG_CONSUMER32_UST: | |
3288 | request.bits_per_long = 32; | |
3289 | break; | |
3290 | default: | |
3291 | request.bits_per_long = 0; | |
3292 | break; | |
3293 | } | |
3294 | ||
3295 | request.session_id = channel->session_id; | |
1950109e | 3296 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3297 | /* |
3298 | * Request the application UID here so the metadata of that application can | |
3299 | * be sent back. The channel UID corresponds to the user UID of the session | |
3300 | * used for the rights on the stream file(s). | |
3301 | */ | |
3302 | request.uid = channel->ust_app_uid; | |
331744e3 | 3303 | request.key = channel->key; |
567eb353 | 3304 | |
1950109e | 3305 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3306 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3307 | request.session_id, request.session_id_per_pid, request.uid, |
3308 | request.key); | |
331744e3 | 3309 | |
75d83e50 | 3310 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3311 | |
3312 | health_code_update(); | |
3313 | ||
331744e3 JD |
3314 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3315 | sizeof(request)); | |
3316 | if (ret < 0) { | |
3317 | ERR("Asking metadata to sessiond"); | |
3318 | goto end; | |
3319 | } | |
3320 | ||
9ce5646a MD |
3321 | health_code_update(); |
3322 | ||
331744e3 JD |
3323 | /* Receive the metadata from sessiond */ |
3324 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3325 | sizeof(msg)); | |
3326 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3327 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3328 | ret, sizeof(msg)); |
3329 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3330 | /* | |
3331 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3332 | * since the caller handles this. | |
3333 | */ | |
3334 | goto end; | |
3335 | } | |
3336 | ||
9ce5646a MD |
3337 | health_code_update(); |
3338 | ||
331744e3 JD |
3339 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3340 | /* No registry found */ | |
3341 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3342 | ret_code); | |
3343 | ret = 0; | |
3344 | goto end; | |
3345 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3346 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3347 | ret = -1; | |
3348 | goto end; | |
3349 | } | |
3350 | ||
3351 | len = msg.u.push_metadata.len; | |
3352 | key = msg.u.push_metadata.key; | |
3353 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3354 | version = msg.u.push_metadata.version; |
331744e3 | 3355 | |
a0377dfe | 3356 | LTTNG_ASSERT(key == channel->key); |
331744e3 JD |
3357 | if (len == 0) { |
3358 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3359 | } | |
3360 | ||
9ce5646a MD |
3361 | health_code_update(); |
3362 | ||
331744e3 JD |
3363 | /* Tell session daemon we are ready to receive the metadata. */ |
3364 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3365 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3366 | if (ret < 0 || len == 0) { |
3367 | /* | |
3368 | * Somehow, the session daemon is not responding anymore or there is | |
3369 | * nothing to receive. | |
3370 | */ | |
3371 | goto end; | |
3372 | } | |
3373 | ||
9ce5646a MD |
3374 | health_code_update(); |
3375 | ||
1eb682be | 3376 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3377 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3378 | if (ret >= 0) { |
f2a444f1 DG |
3379 | /* |
3380 | * Only send the status msg if the sessiond is alive meaning a positive | |
3381 | * ret code. | |
3382 | */ | |
1eb682be | 3383 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3384 | } |
331744e3 JD |
3385 | ret = 0; |
3386 | ||
3387 | end: | |
9ce5646a MD |
3388 | health_code_update(); |
3389 | ||
75d83e50 | 3390 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3391 | return ret; |
3392 | } | |
70190e1c DG |
3393 | |
3394 | /* | |
3395 | * Return the ustctl call for the get stream id. | |
3396 | */ | |
3397 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3398 | uint64_t *stream_id) | |
3399 | { | |
a0377dfe FD |
3400 | LTTNG_ASSERT(stream); |
3401 | LTTNG_ASSERT(stream_id); | |
70190e1c | 3402 | |
b623cb6a | 3403 | return lttng_ust_ctl_get_stream_id(stream->ustream, stream_id); |
70190e1c | 3404 | } |
881fc67f MD |
3405 | |
3406 | void lttng_ustconsumer_sigbus_handle(void *addr) | |
3407 | { | |
3408 | lttng_ust_ctl_sigbus_handle(addr); | |
3409 | } |