Commit | Line | Data |
---|---|---|
3bd1e081 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca> |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3bd1e081 | 5 | * |
ab5be9fa | 6 | * SPDX-License-Identifier: GPL-2.0-only |
3bd1e081 | 7 | * |
3bd1e081 MD |
8 | */ |
9 | ||
6c1c0768 | 10 | #define _LGPL_SOURCE |
3bd1e081 | 11 | #include <assert.h> |
f02e1e8a | 12 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
13 | #include <poll.h> |
14 | #include <pthread.h> | |
15 | #include <stdlib.h> | |
16 | #include <string.h> | |
17 | #include <sys/mman.h> | |
18 | #include <sys/socket.h> | |
dbb5dfe6 | 19 | #include <sys/stat.h> |
3bd1e081 | 20 | #include <sys/types.h> |
77c7c900 | 21 | #include <inttypes.h> |
3bd1e081 | 22 | #include <unistd.h> |
ffe60014 | 23 | #include <urcu/list.h> |
331744e3 | 24 | #include <signal.h> |
02d02e31 | 25 | #include <stdbool.h> |
6f9449c2 | 26 | #include <stdint.h> |
0857097f | 27 | |
51a9e1c7 | 28 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 29 | #include <common/common.h> |
10a8a223 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 31 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 32 | #include <common/compat/fcntl.h> |
f263b7fd | 33 | #include <common/compat/endian.h> |
c8fea79c JR |
34 | #include <common/consumer/consumer-metadata-cache.h> |
35 | #include <common/consumer/consumer-stream.h> | |
36 | #include <common/consumer/consumer-timer.h> | |
fe4477ee | 37 | #include <common/utils.h> |
309167d2 | 38 | #include <common/index/index.h> |
6f9449c2 | 39 | #include <common/consumer/consumer.h> |
b7fc068d | 40 | #include <common/shm.h> |
f5ba75b4 | 41 | #include <common/optional.h> |
10a8a223 DG |
42 | |
43 | #include "ust-consumer.h" | |
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 MD |
49 | |
50 | /* | |
ffe60014 DG |
51 | * Free channel object and all streams associated with it. This MUST be used |
52 | * only and only if the channel has _NEVER_ been added to the global channel | |
53 | * hash table. | |
3bd1e081 | 54 | */ |
ffe60014 | 55 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 56 | { |
ffe60014 DG |
57 | struct lttng_consumer_stream *stream, *stmp; |
58 | ||
59 | assert(channel); | |
60 | ||
61 | DBG("UST consumer cleaning stream list"); | |
62 | ||
63 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
64 | send_node) { | |
9ce5646a MD |
65 | |
66 | health_code_update(); | |
67 | ||
ffe60014 DG |
68 | cds_list_del(&stream->send_node); |
69 | ustctl_destroy_stream(stream->ustream); | |
d2956687 | 70 | lttng_trace_chunk_put(stream->trace_chunk); |
ffe60014 DG |
71 | free(stream); |
72 | } | |
73 | ||
74 | /* | |
75 | * If a channel is available meaning that was created before the streams | |
76 | * were, delete it. | |
77 | */ | |
78 | if (channel->uchan) { | |
79 | lttng_ustconsumer_del_channel(channel); | |
b83e03c4 | 80 | lttng_ustconsumer_free_channel(channel); |
ffe60014 | 81 | } |
88ebf5a7 JR |
82 | |
83 | if (channel->trace_chunk) { | |
84 | lttng_trace_chunk_put(channel->trace_chunk); | |
85 | } | |
86 | ||
ffe60014 DG |
87 | free(channel); |
88 | } | |
3bd1e081 MD |
89 | |
90 | /* | |
ffe60014 | 91 | * Add channel to internal consumer state. |
3bd1e081 | 92 | * |
ffe60014 | 93 | * Returns 0 on success or else a negative value. |
3bd1e081 | 94 | */ |
ffe60014 DG |
95 | static int add_channel(struct lttng_consumer_channel *channel, |
96 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
97 | { |
98 | int ret = 0; | |
99 | ||
ffe60014 DG |
100 | assert(channel); |
101 | assert(ctx); | |
102 | ||
103 | if (ctx->on_recv_channel != NULL) { | |
104 | ret = ctx->on_recv_channel(channel); | |
105 | if (ret == 0) { | |
d8ef542d | 106 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
107 | } else if (ret < 0) { |
108 | /* Most likely an ENOMEM. */ | |
109 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
110 | goto error; | |
111 | } | |
112 | } else { | |
d8ef542d | 113 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
114 | } |
115 | ||
d88aee68 | 116 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
117 | |
118 | error: | |
3bd1e081 MD |
119 | return ret; |
120 | } | |
121 | ||
ffe60014 DG |
122 | /* |
123 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
124 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 125 | * |
ffe60014 | 126 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 127 | */ |
ffe60014 DG |
128 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
129 | struct lttng_consumer_channel *channel, | |
d2956687 | 130 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
ffe60014 DG |
131 | { |
132 | int alloc_ret; | |
133 | struct lttng_consumer_stream *stream = NULL; | |
134 | ||
135 | assert(channel); | |
136 | assert(ctx); | |
137 | ||
6f9449c2 | 138 | stream = consumer_stream_create( |
49f45573 JG |
139 | channel, |
140 | channel->key, | |
ffe60014 | 141 | key, |
ffe60014 | 142 | channel->name, |
ffe60014 DG |
143 | channel->relayd_id, |
144 | channel->session_id, | |
d2956687 | 145 | channel->trace_chunk, |
ffe60014 DG |
146 | cpu, |
147 | &alloc_ret, | |
4891ece8 | 148 | channel->type, |
d2956687 | 149 | channel->monitor); |
ffe60014 DG |
150 | if (stream == NULL) { |
151 | switch (alloc_ret) { | |
152 | case -ENOENT: | |
153 | /* | |
154 | * We could not find the channel. Can happen if cpu hotplug | |
155 | * happens while tearing down. | |
156 | */ | |
157 | DBG3("Could not find channel"); | |
158 | break; | |
159 | case -ENOMEM: | |
160 | case -EINVAL: | |
161 | default: | |
162 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
163 | break; | |
164 | } | |
165 | goto error; | |
166 | } | |
167 | ||
d9a2e16e | 168 | consumer_stream_update_channel_attributes(stream, channel); |
ffe60014 DG |
169 | |
170 | error: | |
171 | if (_alloc_ret) { | |
172 | *_alloc_ret = alloc_ret; | |
173 | } | |
174 | return stream; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Send the given stream pointer to the corresponding thread. | |
179 | * | |
180 | * Returns 0 on success else a negative value. | |
181 | */ | |
182 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
183 | struct lttng_consumer_local_data *ctx) | |
184 | { | |
dae10966 DG |
185 | int ret; |
186 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
187 | |
188 | /* Get the right pipe where the stream will be sent. */ | |
189 | if (stream->metadata_flag) { | |
66d583dc | 190 | consumer_add_metadata_stream(stream); |
dae10966 | 191 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 192 | } else { |
66d583dc | 193 | consumer_add_data_stream(stream); |
dae10966 | 194 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
195 | } |
196 | ||
5ab66908 MD |
197 | /* |
198 | * From this point on, the stream's ownership has been moved away from | |
a8086cf4 JR |
199 | * the channel and it becomes globally visible. Hence, remove it from |
200 | * the local stream list to prevent the stream from being both local and | |
201 | * global. | |
5ab66908 MD |
202 | */ |
203 | stream->globally_visible = 1; | |
a8086cf4 | 204 | cds_list_del(&stream->send_node); |
5ab66908 | 205 | |
dae10966 | 206 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 207 | if (ret < 0) { |
dae10966 DG |
208 | ERR("Consumer write %s stream to pipe %d", |
209 | stream->metadata_flag ? "metadata" : "data", | |
210 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
211 | if (stream->metadata_flag) { |
212 | consumer_del_stream_for_metadata(stream); | |
213 | } else { | |
214 | consumer_del_stream_for_data(stream); | |
215 | } | |
a8086cf4 | 216 | goto error; |
ffe60014 | 217 | } |
a8086cf4 | 218 | |
5ab66908 | 219 | error: |
ffe60014 DG |
220 | return ret; |
221 | } | |
222 | ||
4628484a MD |
223 | static |
224 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) | |
225 | { | |
45863397 | 226 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
4628484a MD |
227 | int ret; |
228 | ||
229 | strncpy(stream_shm_path, shm_path, PATH_MAX); | |
230 | stream_shm_path[PATH_MAX - 1] = '\0'; | |
45863397 | 231 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
67f8cb8d MD |
232 | if (ret < 0) { |
233 | PERROR("snprintf"); | |
4628484a MD |
234 | goto end; |
235 | } | |
236 | strncat(stream_shm_path, cpu_nr, | |
237 | PATH_MAX - strlen(stream_shm_path) - 1); | |
238 | ret = 0; | |
239 | end: | |
240 | return ret; | |
241 | } | |
242 | ||
d88aee68 DG |
243 | /* |
244 | * Create streams for the given channel using liblttng-ust-ctl. | |
d2956687 | 245 | * The channel lock must be acquired by the caller. |
d88aee68 DG |
246 | * |
247 | * Return 0 on success else a negative value. | |
248 | */ | |
ffe60014 | 249 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
d2956687 | 250 | struct lttng_consumer_local_data *ctx) |
ffe60014 DG |
251 | { |
252 | int ret, cpu = 0; | |
253 | struct ustctl_consumer_stream *ustream; | |
254 | struct lttng_consumer_stream *stream; | |
d2956687 | 255 | pthread_mutex_t *current_stream_lock = NULL; |
ffe60014 DG |
256 | |
257 | assert(channel); | |
258 | assert(ctx); | |
259 | ||
260 | /* | |
261 | * While a stream is available from ustctl. When NULL is returned, we've | |
262 | * reached the end of the possible stream for the channel. | |
263 | */ | |
264 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
265 | int wait_fd; | |
04ef1097 | 266 | int ust_metadata_pipe[2]; |
ffe60014 | 267 | |
9ce5646a MD |
268 | health_code_update(); |
269 | ||
04ef1097 MD |
270 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
271 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
272 | if (ret < 0) { | |
273 | ERR("Create ust metadata poll pipe"); | |
274 | goto error; | |
275 | } | |
276 | wait_fd = ust_metadata_pipe[0]; | |
277 | } else { | |
278 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
279 | } | |
ffe60014 DG |
280 | |
281 | /* Allocate consumer stream object. */ | |
d2956687 | 282 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
ffe60014 DG |
283 | if (!stream) { |
284 | goto error_alloc; | |
285 | } | |
286 | stream->ustream = ustream; | |
287 | /* | |
288 | * Store it so we can save multiple function calls afterwards since | |
289 | * this value is used heavily in the stream threads. This is UST | |
290 | * specific so this is why it's done after allocation. | |
291 | */ | |
292 | stream->wait_fd = wait_fd; | |
293 | ||
b31398bb DG |
294 | /* |
295 | * Increment channel refcount since the channel reference has now been | |
296 | * assigned in the allocation process above. | |
297 | */ | |
10a50311 JD |
298 | if (stream->chan->monitor) { |
299 | uatomic_inc(&stream->chan->refcount); | |
300 | } | |
b31398bb | 301 | |
d2956687 JG |
302 | pthread_mutex_lock(&stream->lock); |
303 | current_stream_lock = &stream->lock; | |
ffe60014 DG |
304 | /* |
305 | * Order is important this is why a list is used. On error, the caller | |
306 | * should clean this list. | |
307 | */ | |
308 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
309 | ||
310 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
311 | &stream->max_sb_size); | |
312 | if (ret < 0) { | |
313 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
314 | stream->name); | |
315 | goto error; | |
316 | } | |
317 | ||
318 | /* Do actions once stream has been received. */ | |
319 | if (ctx->on_recv_stream) { | |
320 | ret = ctx->on_recv_stream(stream); | |
321 | if (ret < 0) { | |
322 | goto error; | |
323 | } | |
324 | } | |
325 | ||
d88aee68 | 326 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
327 | stream->name, stream->key, stream->relayd_stream_id); |
328 | ||
329 | /* Set next CPU stream. */ | |
330 | channel->streams.count = ++cpu; | |
d88aee68 DG |
331 | |
332 | /* Keep stream reference when creating metadata. */ | |
333 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
334 | channel->metadata_stream = stream; | |
8de4f941 JG |
335 | if (channel->monitor) { |
336 | /* Set metadata poll pipe if we created one */ | |
337 | memcpy(stream->ust_metadata_poll_pipe, | |
338 | ust_metadata_pipe, | |
339 | sizeof(ust_metadata_pipe)); | |
340 | } | |
d88aee68 | 341 | } |
d2956687 JG |
342 | pthread_mutex_unlock(&stream->lock); |
343 | current_stream_lock = NULL; | |
ffe60014 DG |
344 | } |
345 | ||
346 | return 0; | |
347 | ||
348 | error: | |
349 | error_alloc: | |
d2956687 JG |
350 | if (current_stream_lock) { |
351 | pthread_mutex_unlock(current_stream_lock); | |
352 | } | |
ffe60014 DG |
353 | return ret; |
354 | } | |
355 | ||
d2956687 JG |
356 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, int cpu, |
357 | const struct lttng_credentials *session_credentials) | |
4628484a MD |
358 | { |
359 | char shm_path[PATH_MAX]; | |
360 | int ret; | |
361 | ||
362 | if (!channel->shm_path[0]) { | |
b7fc068d | 363 | return shm_create_anonymous("ust-consumer"); |
4628484a MD |
364 | } |
365 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); | |
366 | if (ret) { | |
367 | goto error_shm_path; | |
368 | } | |
369 | return run_as_open(shm_path, | |
370 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, | |
ff588497 JR |
371 | lttng_credentials_get_uid(session_credentials), |
372 | lttng_credentials_get_gid(session_credentials)); | |
4628484a MD |
373 | |
374 | error_shm_path: | |
375 | return -1; | |
376 | } | |
377 | ||
ffe60014 DG |
378 | /* |
379 | * Create an UST channel with the given attributes and send it to the session | |
380 | * daemon using the ust ctl API. | |
381 | * | |
382 | * Return 0 on success or else a negative value. | |
383 | */ | |
4628484a MD |
384 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
385 | struct ustctl_consumer_channel_attr *attr, | |
386 | struct ustctl_consumer_channel **ust_chanp) | |
ffe60014 | 387 | { |
4628484a MD |
388 | int ret, nr_stream_fds, i, j; |
389 | int *stream_fds; | |
390 | struct ustctl_consumer_channel *ust_channel; | |
ffe60014 | 391 | |
4628484a | 392 | assert(channel); |
ffe60014 | 393 | assert(attr); |
4628484a | 394 | assert(ust_chanp); |
d2956687 | 395 | assert(channel->buffer_credentials.is_set); |
ffe60014 DG |
396 | |
397 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
398 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
399 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
400 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
401 | attr->num_subbuf, attr->switch_timer_interval, | |
402 | attr->read_timer_interval, attr->output, attr->type); | |
403 | ||
4628484a MD |
404 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
405 | nr_stream_fds = 1; | |
406 | else | |
407 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); | |
408 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); | |
409 | if (!stream_fds) { | |
410 | ret = -1; | |
411 | goto error_alloc; | |
412 | } | |
413 | for (i = 0; i < nr_stream_fds; i++) { | |
d2956687 JG |
414 | stream_fds[i] = open_ust_stream_fd(channel, i, |
415 | &channel->buffer_credentials.value); | |
4628484a MD |
416 | if (stream_fds[i] < 0) { |
417 | ret = -1; | |
418 | goto error_open; | |
419 | } | |
420 | } | |
421 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); | |
422 | if (!ust_channel) { | |
ffe60014 DG |
423 | ret = -1; |
424 | goto error_create; | |
425 | } | |
4628484a MD |
426 | channel->nr_stream_fds = nr_stream_fds; |
427 | channel->stream_fds = stream_fds; | |
428 | *ust_chanp = ust_channel; | |
ffe60014 DG |
429 | |
430 | return 0; | |
431 | ||
432 | error_create: | |
4628484a MD |
433 | error_open: |
434 | for (j = i - 1; j >= 0; j--) { | |
435 | int closeret; | |
436 | ||
437 | closeret = close(stream_fds[j]); | |
438 | if (closeret) { | |
439 | PERROR("close"); | |
440 | } | |
441 | if (channel->shm_path[0]) { | |
442 | char shm_path[PATH_MAX]; | |
443 | ||
444 | closeret = get_stream_shm_path(shm_path, | |
445 | channel->shm_path, j); | |
446 | if (closeret) { | |
447 | ERR("Cannot get stream shm path"); | |
448 | } | |
449 | closeret = run_as_unlink(shm_path, | |
ff588497 JR |
450 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
451 | channel->buffer_credentials)), | |
452 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
453 | channel->buffer_credentials))); | |
4628484a | 454 | if (closeret) { |
4628484a MD |
455 | PERROR("unlink %s", shm_path); |
456 | } | |
457 | } | |
458 | } | |
459 | /* Try to rmdir all directories under shm_path root. */ | |
460 | if (channel->root_shm_path[0]) { | |
602766ec | 461 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
ff588497 JR |
462 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
463 | channel->buffer_credentials)), | |
464 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
465 | channel->buffer_credentials)), | |
f75c5439 | 466 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
4628484a MD |
467 | } |
468 | free(stream_fds); | |
469 | error_alloc: | |
ffe60014 DG |
470 | return ret; |
471 | } | |
472 | ||
d88aee68 DG |
473 | /* |
474 | * Send a single given stream to the session daemon using the sock. | |
475 | * | |
476 | * Return 0 on success else a negative value. | |
477 | */ | |
ffe60014 DG |
478 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
479 | { | |
480 | int ret; | |
481 | ||
482 | assert(stream); | |
483 | assert(sock >= 0); | |
484 | ||
3eb914c0 | 485 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
486 | |
487 | /* Send stream to session daemon. */ | |
488 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
489 | if (ret < 0) { | |
490 | goto error; | |
491 | } | |
492 | ||
ffe60014 DG |
493 | error: |
494 | return ret; | |
495 | } | |
496 | ||
497 | /* | |
a3a86f35 | 498 | * Send channel to sessiond and relayd if applicable. |
ffe60014 | 499 | * |
d88aee68 | 500 | * Return 0 on success or else a negative value. |
ffe60014 | 501 | */ |
a3a86f35 | 502 | static int send_channel_to_sessiond_and_relayd(int sock, |
ffe60014 DG |
503 | struct lttng_consumer_channel *channel, |
504 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
505 | { | |
0c759fc9 | 506 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
ffe60014 | 507 | struct lttng_consumer_stream *stream; |
a4baae1b | 508 | uint64_t net_seq_idx = -1ULL; |
ffe60014 DG |
509 | |
510 | assert(channel); | |
511 | assert(ctx); | |
512 | assert(sock >= 0); | |
513 | ||
514 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
515 | ||
62285ea4 DG |
516 | if (channel->relayd_id != (uint64_t) -1ULL) { |
517 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
518 | |
519 | health_code_update(); | |
520 | ||
62285ea4 | 521 | /* Try to send the stream to the relayd if one is available. */ |
a3a86f35 JG |
522 | DBG("Sending stream %" PRIu64 " of channel \"%s\" to relayd", |
523 | stream->key, channel->name); | |
62285ea4 DG |
524 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
525 | if (ret < 0) { | |
526 | /* | |
527 | * Flag that the relayd was the problem here probably due to a | |
528 | * communicaton error on the socket. | |
529 | */ | |
530 | if (relayd_error) { | |
531 | *relayd_error = 1; | |
532 | } | |
725d28b2 | 533 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
ffe60014 | 534 | } |
a4baae1b JD |
535 | if (net_seq_idx == -1ULL) { |
536 | net_seq_idx = stream->net_seq_idx; | |
537 | } | |
538 | } | |
f2a444f1 | 539 | } |
ffe60014 | 540 | |
f2a444f1 DG |
541 | /* Inform sessiond that we are about to send channel and streams. */ |
542 | ret = consumer_send_status_msg(sock, ret_code); | |
0c759fc9 | 543 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
544 | /* |
545 | * Either the session daemon is not responding or the relayd died so we | |
546 | * stop now. | |
547 | */ | |
548 | goto error; | |
549 | } | |
550 | ||
551 | /* Send channel to sessiond. */ | |
552 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
553 | if (ret < 0) { | |
554 | goto error; | |
555 | } | |
556 | ||
557 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
558 | if (ret < 0) { | |
559 | goto error; | |
560 | } | |
561 | ||
562 | /* The channel was sent successfully to the sessiond at this point. */ | |
563 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
564 | |
565 | health_code_update(); | |
566 | ||
ffe60014 DG |
567 | /* Send stream to session daemon. */ |
568 | ret = send_sessiond_stream(sock, stream); | |
569 | if (ret < 0) { | |
570 | goto error; | |
571 | } | |
572 | } | |
573 | ||
574 | /* Tell sessiond there is no more stream. */ | |
575 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
576 | if (ret < 0) { | |
577 | goto error; | |
578 | } | |
579 | ||
580 | DBG("UST consumer NULL stream sent to sessiond"); | |
581 | ||
582 | return 0; | |
583 | ||
584 | error: | |
0c759fc9 | 585 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
f2a444f1 DG |
586 | ret = -1; |
587 | } | |
ffe60014 DG |
588 | return ret; |
589 | } | |
590 | ||
591 | /* | |
592 | * Creates a channel and streams and add the channel it to the channel internal | |
593 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
594 | * received. | |
595 | * | |
596 | * Return 0 on success or else, a negative value is returned and the channel | |
597 | * MUST be destroyed by consumer_del_channel(). | |
598 | */ | |
75cfe9e6 | 599 | static int ask_channel(struct lttng_consumer_local_data *ctx, |
ffe60014 | 600 | struct lttng_consumer_channel *channel, |
d2956687 | 601 | struct ustctl_consumer_channel_attr *attr) |
3bd1e081 MD |
602 | { |
603 | int ret; | |
604 | ||
ffe60014 DG |
605 | assert(ctx); |
606 | assert(channel); | |
607 | assert(attr); | |
608 | ||
609 | /* | |
610 | * This value is still used by the kernel consumer since for the kernel, | |
611 | * the stream ownership is not IN the consumer so we need to have the | |
612 | * number of left stream that needs to be initialized so we can know when | |
613 | * to delete the channel (see consumer.c). | |
614 | * | |
615 | * As for the user space tracer now, the consumer creates and sends the | |
616 | * stream to the session daemon which only sends them to the application | |
617 | * once every stream of a channel is received making this value useless | |
618 | * because we they will be added to the poll thread before the application | |
619 | * receives them. This ensures that a stream can not hang up during | |
620 | * initilization of a channel. | |
621 | */ | |
622 | channel->nb_init_stream_left = 0; | |
623 | ||
624 | /* The reply msg status is handled in the following call. */ | |
4628484a | 625 | ret = create_ust_channel(channel, attr, &channel->uchan); |
ffe60014 | 626 | if (ret < 0) { |
10a50311 | 627 | goto end; |
3bd1e081 MD |
628 | } |
629 | ||
d8ef542d MD |
630 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
631 | ||
10a50311 JD |
632 | /* |
633 | * For the snapshots (no monitor), we create the metadata streams | |
634 | * on demand, not during the channel creation. | |
635 | */ | |
636 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
637 | ret = 0; | |
638 | goto end; | |
639 | } | |
640 | ||
ffe60014 | 641 | /* Open all streams for this channel. */ |
d2956687 JG |
642 | pthread_mutex_lock(&channel->lock); |
643 | ret = create_ust_streams(channel, ctx); | |
644 | pthread_mutex_unlock(&channel->lock); | |
ffe60014 | 645 | if (ret < 0) { |
10a50311 | 646 | goto end; |
ffe60014 DG |
647 | } |
648 | ||
10a50311 | 649 | end: |
3bd1e081 MD |
650 | return ret; |
651 | } | |
652 | ||
d88aee68 DG |
653 | /* |
654 | * Send all stream of a channel to the right thread handling it. | |
655 | * | |
656 | * On error, return a negative value else 0 on success. | |
657 | */ | |
658 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
659 | struct lttng_consumer_local_data *ctx) | |
660 | { | |
661 | int ret = 0; | |
662 | struct lttng_consumer_stream *stream, *stmp; | |
663 | ||
664 | assert(channel); | |
665 | assert(ctx); | |
666 | ||
667 | /* Send streams to the corresponding thread. */ | |
668 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
669 | send_node) { | |
9ce5646a MD |
670 | |
671 | health_code_update(); | |
672 | ||
d88aee68 DG |
673 | /* Sending the stream to the thread. */ |
674 | ret = send_stream_to_thread(stream, ctx); | |
675 | if (ret < 0) { | |
676 | /* | |
677 | * If we are unable to send the stream to the thread, there is | |
678 | * a big problem so just stop everything. | |
679 | */ | |
680 | goto error; | |
681 | } | |
d88aee68 DG |
682 | } |
683 | ||
684 | error: | |
685 | return ret; | |
686 | } | |
687 | ||
7972aab2 DG |
688 | /* |
689 | * Flush channel's streams using the given key to retrieve the channel. | |
690 | * | |
691 | * Return 0 on success else an LTTng error code. | |
692 | */ | |
693 | static int flush_channel(uint64_t chan_key) | |
694 | { | |
695 | int ret = 0; | |
696 | struct lttng_consumer_channel *channel; | |
697 | struct lttng_consumer_stream *stream; | |
698 | struct lttng_ht *ht; | |
699 | struct lttng_ht_iter iter; | |
700 | ||
8fd623e0 | 701 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 702 | |
a500c257 | 703 | rcu_read_lock(); |
7972aab2 DG |
704 | channel = consumer_find_channel(chan_key); |
705 | if (!channel) { | |
8fd623e0 | 706 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
707 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
708 | goto error; | |
709 | } | |
710 | ||
fa29bfbf | 711 | ht = the_consumer_data.stream_per_chan_id_ht; |
7972aab2 DG |
712 | |
713 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
714 | cds_lfht_for_each_entry_duplicate(ht->ht, |
715 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
716 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
717 | |
718 | health_code_update(); | |
719 | ||
0dd01979 | 720 | pthread_mutex_lock(&stream->lock); |
5cfcab67 JR |
721 | |
722 | /* | |
723 | * Protect against concurrent teardown of a stream. | |
724 | */ | |
725 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
726 | goto next; | |
727 | } | |
728 | ||
0dd01979 MD |
729 | if (!stream->quiescent) { |
730 | ustctl_flush_buffer(stream->ustream, 0); | |
731 | stream->quiescent = true; | |
732 | } | |
5cfcab67 | 733 | next: |
0dd01979 MD |
734 | pthread_mutex_unlock(&stream->lock); |
735 | } | |
736 | error: | |
737 | rcu_read_unlock(); | |
738 | return ret; | |
739 | } | |
740 | ||
741 | /* | |
742 | * Clear quiescent state from channel's streams using the given key to | |
743 | * retrieve the channel. | |
744 | * | |
745 | * Return 0 on success else an LTTng error code. | |
746 | */ | |
747 | static int clear_quiescent_channel(uint64_t chan_key) | |
748 | { | |
749 | int ret = 0; | |
750 | struct lttng_consumer_channel *channel; | |
751 | struct lttng_consumer_stream *stream; | |
752 | struct lttng_ht *ht; | |
753 | struct lttng_ht_iter iter; | |
754 | ||
755 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); | |
756 | ||
757 | rcu_read_lock(); | |
758 | channel = consumer_find_channel(chan_key); | |
759 | if (!channel) { | |
760 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); | |
761 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
762 | goto error; | |
763 | } | |
764 | ||
fa29bfbf | 765 | ht = the_consumer_data.stream_per_chan_id_ht; |
0dd01979 MD |
766 | |
767 | /* For each stream of the channel id, clear quiescent state. */ | |
768 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
769 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
770 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
771 | ||
772 | health_code_update(); | |
773 | ||
774 | pthread_mutex_lock(&stream->lock); | |
775 | stream->quiescent = false; | |
776 | pthread_mutex_unlock(&stream->lock); | |
7972aab2 | 777 | } |
7972aab2 | 778 | error: |
a500c257 | 779 | rcu_read_unlock(); |
7972aab2 DG |
780 | return ret; |
781 | } | |
782 | ||
d88aee68 DG |
783 | /* |
784 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
785 | * | |
786 | * Return 0 on success else an LTTng error code. | |
787 | */ | |
788 | static int close_metadata(uint64_t chan_key) | |
789 | { | |
ea88ca2a | 790 | int ret = 0; |
d88aee68 | 791 | struct lttng_consumer_channel *channel; |
f65a74be | 792 | unsigned int channel_monitor; |
d88aee68 | 793 | |
8fd623e0 | 794 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
795 | |
796 | channel = consumer_find_channel(chan_key); | |
797 | if (!channel) { | |
84cc9aa0 DG |
798 | /* |
799 | * This is possible if the metadata thread has issue a delete because | |
800 | * the endpoint point of the stream hung up. There is no way the | |
801 | * session daemon can know about it thus use a DBG instead of an actual | |
802 | * error. | |
803 | */ | |
804 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
805 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
806 | goto error; | |
807 | } | |
808 | ||
fa29bfbf | 809 | pthread_mutex_lock(&the_consumer_data.lock); |
a9838785 | 810 | pthread_mutex_lock(&channel->lock); |
f65a74be | 811 | channel_monitor = channel->monitor; |
73811ecc DG |
812 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
813 | goto error_unlock; | |
814 | } | |
815 | ||
6d574024 | 816 | lttng_ustconsumer_close_metadata(channel); |
f65a74be | 817 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 818 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 | 819 | |
f65a74be JG |
820 | /* |
821 | * The ownership of a metadata channel depends on the type of | |
822 | * session to which it belongs. In effect, the monitor flag is checked | |
823 | * to determine if this metadata channel is in "snapshot" mode or not. | |
824 | * | |
825 | * In the non-snapshot case, the metadata channel is created along with | |
826 | * a single stream which will remain present until the metadata channel | |
827 | * is destroyed (on the destruction of its session). In this case, the | |
828 | * metadata stream in "monitored" by the metadata poll thread and holds | |
829 | * the ownership of its channel. | |
830 | * | |
831 | * Closing the metadata will cause the metadata stream's "metadata poll | |
832 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll | |
833 | * thread which will teardown the metadata stream which, in return, | |
834 | * deletes the metadata channel. | |
835 | * | |
836 | * In the snapshot case, the metadata stream is created and destroyed | |
837 | * on every snapshot record. Since the channel doesn't have an owner | |
838 | * other than the session daemon, it is safe to destroy it immediately | |
839 | * on reception of the CLOSE_METADATA command. | |
840 | */ | |
841 | if (!channel_monitor) { | |
842 | /* | |
843 | * The channel and consumer_data locks must be | |
844 | * released before this call since consumer_del_channel | |
845 | * re-acquires the channel and consumer_data locks to teardown | |
846 | * the channel and queue its reclamation by the "call_rcu" | |
847 | * worker thread. | |
848 | */ | |
849 | consumer_del_channel(channel); | |
850 | } | |
851 | ||
852 | return ret; | |
ea88ca2a | 853 | error_unlock: |
a9838785 | 854 | pthread_mutex_unlock(&channel->lock); |
fa29bfbf | 855 | pthread_mutex_unlock(&the_consumer_data.lock); |
d88aee68 DG |
856 | error: |
857 | return ret; | |
858 | } | |
859 | ||
860 | /* | |
861 | * RCU read side lock MUST be acquired before calling this function. | |
862 | * | |
863 | * Return 0 on success else an LTTng error code. | |
864 | */ | |
865 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
866 | { | |
867 | int ret; | |
868 | struct lttng_consumer_channel *metadata; | |
869 | ||
8fd623e0 | 870 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
871 | |
872 | metadata = consumer_find_channel(key); | |
873 | if (!metadata) { | |
874 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
875 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
876 | goto end; |
877 | } | |
878 | ||
879 | /* | |
880 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
881 | * ownership transfer to the metadata thread. | |
882 | */ | |
883 | if (!metadata->monitor) { | |
884 | DBG("Metadata channel in no monitor"); | |
885 | ret = 0; | |
886 | goto end; | |
d88aee68 DG |
887 | } |
888 | ||
889 | /* | |
890 | * Send metadata stream to relayd if one available. Availability is | |
891 | * known if the stream is still in the list of the channel. | |
892 | */ | |
893 | if (cds_list_empty(&metadata->streams.head)) { | |
894 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
895 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 896 | goto error_no_stream; |
d88aee68 DG |
897 | } |
898 | ||
899 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
900 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
901 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
902 | metadata->pathname); | |
903 | if (ret < 0) { | |
904 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
905 | goto error; | |
906 | } | |
601262d6 JD |
907 | ret = consumer_send_relayd_streams_sent( |
908 | metadata->metadata_stream->net_seq_idx); | |
909 | if (ret < 0) { | |
910 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; | |
911 | goto error; | |
912 | } | |
d88aee68 DG |
913 | } |
914 | ||
a8086cf4 JR |
915 | /* |
916 | * Ownership of metadata stream is passed along. Freeing is handled by | |
917 | * the callee. | |
918 | */ | |
d88aee68 DG |
919 | ret = send_streams_to_thread(metadata, ctx); |
920 | if (ret < 0) { | |
921 | /* | |
922 | * If we are unable to send the stream to the thread, there is | |
923 | * a big problem so just stop everything. | |
924 | */ | |
925 | ret = LTTCOMM_CONSUMERD_FATAL; | |
a8086cf4 | 926 | goto send_streams_error; |
d88aee68 DG |
927 | } |
928 | /* List MUST be empty after or else it could be reused. */ | |
929 | assert(cds_list_empty(&metadata->streams.head)); | |
930 | ||
10a50311 JD |
931 | ret = 0; |
932 | goto end; | |
d88aee68 DG |
933 | |
934 | error: | |
f2a444f1 DG |
935 | /* |
936 | * Delete metadata channel on error. At this point, the metadata stream can | |
937 | * NOT be monitored by the metadata thread thus having the guarantee that | |
938 | * the stream is still in the local stream list of the channel. This call | |
939 | * will make sure to clean that list. | |
940 | */ | |
f5a0c9cf | 941 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
212d67a2 DG |
942 | cds_list_del(&metadata->metadata_stream->send_node); |
943 | metadata->metadata_stream = NULL; | |
a8086cf4 | 944 | send_streams_error: |
f5a0c9cf | 945 | error_no_stream: |
10a50311 JD |
946 | end: |
947 | return ret; | |
948 | } | |
949 | ||
950 | /* | |
951 | * Snapshot the whole metadata. | |
d2956687 | 952 | * RCU read-side lock must be held by the caller. |
10a50311 JD |
953 | * |
954 | * Returns 0 on success, < 0 on error | |
955 | */ | |
3eb928aa MD |
956 | static int snapshot_metadata(struct lttng_consumer_channel *metadata_channel, |
957 | uint64_t key, char *path, uint64_t relayd_id, | |
d2956687 | 958 | struct lttng_consumer_local_data *ctx) |
10a50311 JD |
959 | { |
960 | int ret = 0; | |
10a50311 JD |
961 | struct lttng_consumer_stream *metadata_stream; |
962 | ||
963 | assert(path); | |
964 | assert(ctx); | |
965 | ||
966 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
967 | key, path); | |
968 | ||
969 | rcu_read_lock(); | |
970 | ||
10a50311 JD |
971 | assert(!metadata_channel->monitor); |
972 | ||
9ce5646a MD |
973 | health_code_update(); |
974 | ||
10a50311 JD |
975 | /* |
976 | * Ask the sessiond if we have new metadata waiting and update the | |
977 | * consumer metadata cache. | |
978 | */ | |
94d49140 | 979 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
980 | if (ret < 0) { |
981 | goto error; | |
982 | } | |
983 | ||
9ce5646a MD |
984 | health_code_update(); |
985 | ||
10a50311 JD |
986 | /* |
987 | * The metadata stream is NOT created in no monitor mode when the channel | |
988 | * is created on a sessiond ask channel command. | |
989 | */ | |
d2956687 | 990 | ret = create_ust_streams(metadata_channel, ctx); |
10a50311 JD |
991 | if (ret < 0) { |
992 | goto error; | |
993 | } | |
994 | ||
995 | metadata_stream = metadata_channel->metadata_stream; | |
996 | assert(metadata_stream); | |
997 | ||
d2956687 | 998 | pthread_mutex_lock(&metadata_stream->lock); |
10a50311 JD |
999 | if (relayd_id != (uint64_t) -1ULL) { |
1000 | metadata_stream->net_seq_idx = relayd_id; | |
1001 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
10a50311 | 1002 | } else { |
d2956687 JG |
1003 | ret = consumer_stream_create_output_files(metadata_stream, |
1004 | false); | |
1005 | } | |
1006 | pthread_mutex_unlock(&metadata_stream->lock); | |
1007 | if (ret < 0) { | |
1008 | goto error_stream; | |
10a50311 JD |
1009 | } |
1010 | ||
04ef1097 | 1011 | do { |
9ce5646a MD |
1012 | health_code_update(); |
1013 | ||
6f9449c2 | 1014 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx, true); |
10a50311 | 1015 | if (ret < 0) { |
94d49140 | 1016 | goto error_stream; |
10a50311 | 1017 | } |
04ef1097 | 1018 | } while (ret > 0); |
10a50311 | 1019 | |
10a50311 JD |
1020 | error_stream: |
1021 | /* | |
1022 | * Clean up the stream completly because the next snapshot will use a new | |
1023 | * metadata stream. | |
1024 | */ | |
10a50311 | 1025 | consumer_stream_destroy(metadata_stream, NULL); |
212d67a2 | 1026 | cds_list_del(&metadata_stream->send_node); |
10a50311 JD |
1027 | metadata_channel->metadata_stream = NULL; |
1028 | ||
1029 | error: | |
1030 | rcu_read_unlock(); | |
1031 | return ret; | |
1032 | } | |
1033 | ||
128708c3 JG |
1034 | static |
1035 | int get_current_subbuf_addr(struct lttng_consumer_stream *stream, | |
1036 | const char **addr) | |
1037 | { | |
1038 | int ret; | |
1039 | unsigned long mmap_offset; | |
1040 | const char *mmap_base; | |
1041 | ||
1042 | mmap_base = ustctl_get_mmap_base(stream->ustream); | |
1043 | if (!mmap_base) { | |
1044 | ERR("Failed to get mmap base for stream `%s`", | |
1045 | stream->name); | |
1046 | ret = -EPERM; | |
1047 | goto error; | |
1048 | } | |
1049 | ||
1050 | ret = ustctl_get_mmap_read_offset(stream->ustream, &mmap_offset); | |
1051 | if (ret != 0) { | |
1052 | ERR("Failed to get mmap offset for stream `%s`", stream->name); | |
1053 | ret = -EINVAL; | |
1054 | goto error; | |
1055 | } | |
1056 | ||
1057 | *addr = mmap_base + mmap_offset; | |
1058 | error: | |
1059 | return ret; | |
1060 | ||
1061 | } | |
1062 | ||
10a50311 JD |
1063 | /* |
1064 | * Take a snapshot of all the stream of a channel. | |
d2956687 | 1065 | * RCU read-side lock and the channel lock must be held by the caller. |
10a50311 JD |
1066 | * |
1067 | * Returns 0 on success, < 0 on error | |
1068 | */ | |
3eb928aa MD |
1069 | static int snapshot_channel(struct lttng_consumer_channel *channel, |
1070 | uint64_t key, char *path, uint64_t relayd_id, | |
e098433c JG |
1071 | uint64_t nb_packets_per_stream, |
1072 | struct lttng_consumer_local_data *ctx) | |
10a50311 JD |
1073 | { |
1074 | int ret; | |
1075 | unsigned use_relayd = 0; | |
1076 | unsigned long consumed_pos, produced_pos; | |
10a50311 JD |
1077 | struct lttng_consumer_stream *stream; |
1078 | ||
1079 | assert(path); | |
1080 | assert(ctx); | |
1081 | ||
1082 | rcu_read_lock(); | |
1083 | ||
1084 | if (relayd_id != (uint64_t) -1ULL) { | |
1085 | use_relayd = 1; | |
1086 | } | |
1087 | ||
10a50311 | 1088 | assert(!channel->monitor); |
6a00837f | 1089 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
1090 | |
1091 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
1092 | health_code_update(); |
1093 | ||
10a50311 JD |
1094 | /* Lock stream because we are about to change its state. */ |
1095 | pthread_mutex_lock(&stream->lock); | |
d2956687 JG |
1096 | assert(channel->trace_chunk); |
1097 | if (!lttng_trace_chunk_get(channel->trace_chunk)) { | |
1098 | /* | |
1099 | * Can't happen barring an internal error as the channel | |
1100 | * holds a reference to the trace chunk. | |
1101 | */ | |
1102 | ERR("Failed to acquire reference to channel's trace chunk"); | |
1103 | ret = -1; | |
1104 | goto error_unlock; | |
1105 | } | |
1106 | assert(!stream->trace_chunk); | |
1107 | stream->trace_chunk = channel->trace_chunk; | |
1108 | ||
10a50311 JD |
1109 | stream->net_seq_idx = relayd_id; |
1110 | ||
1111 | if (use_relayd) { | |
1112 | ret = consumer_send_relayd_stream(stream, path); | |
1113 | if (ret < 0) { | |
1114 | goto error_unlock; | |
1115 | } | |
1116 | } else { | |
d2956687 JG |
1117 | ret = consumer_stream_create_output_files(stream, |
1118 | false); | |
10a50311 JD |
1119 | if (ret < 0) { |
1120 | goto error_unlock; | |
1121 | } | |
d2956687 JG |
1122 | DBG("UST consumer snapshot stream (%" PRIu64 ")", |
1123 | stream->key); | |
10a50311 JD |
1124 | } |
1125 | ||
d4d80f77 MD |
1126 | /* |
1127 | * If tracing is active, we want to perform a "full" buffer flush. | |
1128 | * Else, if quiescent, it has already been done by the prior stop. | |
1129 | */ | |
1130 | if (!stream->quiescent) { | |
1131 | ustctl_flush_buffer(stream->ustream, 0); | |
1132 | } | |
10a50311 JD |
1133 | |
1134 | ret = lttng_ustconsumer_take_snapshot(stream); | |
1135 | if (ret < 0) { | |
1136 | ERR("Taking UST snapshot"); | |
1137 | goto error_unlock; | |
1138 | } | |
1139 | ||
1140 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
1141 | if (ret < 0) { | |
1142 | ERR("Produced UST snapshot position"); | |
1143 | goto error_unlock; | |
1144 | } | |
1145 | ||
1146 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
1147 | if (ret < 0) { | |
1148 | ERR("Consumerd UST snapshot position"); | |
1149 | goto error_unlock; | |
1150 | } | |
1151 | ||
5c786ded JD |
1152 | /* |
1153 | * The original value is sent back if max stream size is larger than | |
d07ceecd | 1154 | * the possible size of the snapshot. Also, we assume that the session |
5c786ded JD |
1155 | * daemon should never send a maximum stream size that is lower than |
1156 | * subbuffer size. | |
1157 | */ | |
d07ceecd MD |
1158 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
1159 | produced_pos, nb_packets_per_stream, | |
1160 | stream->max_sb_size); | |
5c786ded | 1161 | |
9377d830 | 1162 | while ((long) (consumed_pos - produced_pos) < 0) { |
10a50311 JD |
1163 | ssize_t read_len; |
1164 | unsigned long len, padded_len; | |
128708c3 | 1165 | const char *subbuf_addr; |
fd424d99 | 1166 | struct lttng_buffer_view subbuf_view; |
10a50311 | 1167 | |
9ce5646a MD |
1168 | health_code_update(); |
1169 | ||
10a50311 JD |
1170 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
1171 | ||
1172 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
1173 | if (ret < 0) { | |
1174 | if (ret != -EAGAIN) { | |
1175 | PERROR("ustctl_get_subbuf snapshot"); | |
1176 | goto error_close_stream; | |
1177 | } | |
1178 | DBG("UST consumer get subbuf failed. Skipping it."); | |
1179 | consumed_pos += stream->max_sb_size; | |
ddc93ee4 | 1180 | stream->chan->lost_packets++; |
10a50311 JD |
1181 | continue; |
1182 | } | |
1183 | ||
1184 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
1185 | if (ret < 0) { | |
1186 | ERR("Snapshot ustctl_get_subbuf_size"); | |
1187 | goto error_put_subbuf; | |
1188 | } | |
1189 | ||
1190 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
1191 | if (ret < 0) { | |
1192 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1193 | goto error_put_subbuf; | |
1194 | } | |
1195 | ||
128708c3 JG |
1196 | ret = get_current_subbuf_addr(stream, &subbuf_addr); |
1197 | if (ret) { | |
1198 | goto error_put_subbuf; | |
1199 | } | |
1200 | ||
fd424d99 JG |
1201 | subbuf_view = lttng_buffer_view_init( |
1202 | subbuf_addr, 0, padded_len); | |
f5ba75b4 | 1203 | read_len = lttng_consumer_on_read_subbuffer_mmap( |
6f9449c2 | 1204 | stream, &subbuf_view, padded_len - len); |
10a50311 JD |
1205 | if (use_relayd) { |
1206 | if (read_len != len) { | |
56591bac | 1207 | ret = -EPERM; |
10a50311 JD |
1208 | goto error_put_subbuf; |
1209 | } | |
1210 | } else { | |
1211 | if (read_len != padded_len) { | |
56591bac | 1212 | ret = -EPERM; |
10a50311 JD |
1213 | goto error_put_subbuf; |
1214 | } | |
1215 | } | |
1216 | ||
1217 | ret = ustctl_put_subbuf(stream->ustream); | |
1218 | if (ret < 0) { | |
1219 | ERR("Snapshot ustctl_put_subbuf"); | |
1220 | goto error_close_stream; | |
1221 | } | |
1222 | consumed_pos += stream->max_sb_size; | |
1223 | } | |
1224 | ||
1225 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1226 | consumer_stream_close(stream); | |
1227 | pthread_mutex_unlock(&stream->lock); | |
1228 | } | |
1229 | ||
1230 | rcu_read_unlock(); | |
1231 | return 0; | |
1232 | ||
1233 | error_put_subbuf: | |
1234 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1235 | ERR("Snapshot ustctl_put_subbuf"); | |
1236 | } | |
1237 | error_close_stream: | |
1238 | consumer_stream_close(stream); | |
1239 | error_unlock: | |
1240 | pthread_mutex_unlock(&stream->lock); | |
10a50311 | 1241 | rcu_read_unlock(); |
d88aee68 DG |
1242 | return ret; |
1243 | } | |
1244 | ||
b1316da1 JG |
1245 | static |
1246 | void metadata_stream_reset_cache_consumed_position( | |
1247 | struct lttng_consumer_stream *stream) | |
1248 | { | |
1249 | ASSERT_LOCKED(stream->lock); | |
1250 | ||
1251 | DBG("Reset metadata cache of session %" PRIu64, | |
1252 | stream->chan->session_id); | |
1253 | stream->ust_metadata_pushed = 0; | |
1254 | } | |
1255 | ||
331744e3 | 1256 | /* |
c585821b MD |
1257 | * Receive the metadata updates from the sessiond. Supports receiving |
1258 | * overlapping metadata, but is needs to always belong to a contiguous | |
1259 | * range starting from 0. | |
1260 | * Be careful about the locks held when calling this function: it needs | |
1261 | * the metadata cache flush to concurrently progress in order to | |
1262 | * complete. | |
331744e3 JD |
1263 | */ |
1264 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
93ec662e JD |
1265 | uint64_t len, uint64_t version, |
1266 | struct lttng_consumer_channel *channel, int timer, int wait) | |
331744e3 | 1267 | { |
0c759fc9 | 1268 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
331744e3 | 1269 | char *metadata_str; |
b1316da1 | 1270 | enum consumer_metadata_cache_write_status cache_write_status; |
331744e3 | 1271 | |
8fd623e0 | 1272 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1273 | |
1274 | metadata_str = zmalloc(len * sizeof(char)); | |
1275 | if (!metadata_str) { | |
1276 | PERROR("zmalloc metadata string"); | |
1277 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1278 | goto end; | |
1279 | } | |
1280 | ||
9ce5646a MD |
1281 | health_code_update(); |
1282 | ||
331744e3 JD |
1283 | /* Receive metadata string. */ |
1284 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1285 | if (ret < 0) { | |
1286 | /* Session daemon is dead so return gracefully. */ | |
1287 | ret_code = ret; | |
1288 | goto end_free; | |
1289 | } | |
1290 | ||
9ce5646a MD |
1291 | health_code_update(); |
1292 | ||
331744e3 | 1293 | pthread_mutex_lock(&channel->metadata_cache->lock); |
b1316da1 | 1294 | cache_write_status = consumer_metadata_cache_write( |
a25d34bc JG |
1295 | channel->metadata_cache, offset, len, version, |
1296 | metadata_str); | |
3bdc49f3 | 1297 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
b1316da1 JG |
1298 | switch (cache_write_status) { |
1299 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE: | |
1300 | /* | |
1301 | * The write entirely overlapped with existing contents of the | |
1302 | * same metadata version (same content); there is nothing to do. | |
1303 | */ | |
1304 | break; | |
1305 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED: | |
1306 | /* | |
1307 | * The metadata cache was invalidated (previously pushed | |
1308 | * content has been overwritten). Reset the stream's consumed | |
1309 | * metadata position to ensure the metadata poll thread consumes | |
1310 | * the whole cache. | |
1311 | */ | |
1312 | pthread_mutex_lock(&channel->metadata_stream->lock); | |
1313 | metadata_stream_reset_cache_consumed_position( | |
1314 | channel->metadata_stream); | |
1315 | pthread_mutex_unlock(&channel->metadata_stream->lock); | |
1316 | /* Fall-through. */ | |
1317 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT: | |
1318 | /* | |
1319 | * In both cases, the metadata poll thread has new data to | |
1320 | * consume. | |
1321 | */ | |
1322 | ret = consumer_metadata_wakeup_pipe(channel); | |
1323 | if (ret) { | |
1324 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
1325 | goto end_free; | |
1326 | } | |
1327 | break; | |
1328 | case CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR: | |
331744e3 JD |
1329 | /* Unable to handle metadata. Notify session daemon. */ |
1330 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1331 | /* |
1332 | * Skip metadata flush on write error since the offset and len might | |
1333 | * not have been updated which could create an infinite loop below when | |
1334 | * waiting for the metadata cache to be flushed. | |
1335 | */ | |
a32bd775 | 1336 | goto end_free; |
b1316da1 JG |
1337 | default: |
1338 | abort(); | |
331744e3 | 1339 | } |
331744e3 | 1340 | |
94d49140 JD |
1341 | if (!wait) { |
1342 | goto end_free; | |
1343 | } | |
5e41ebe1 | 1344 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1345 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1346 | |
1347 | health_code_update(); | |
1348 | ||
331744e3 JD |
1349 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1350 | } | |
1351 | ||
1352 | end_free: | |
1353 | free(metadata_str); | |
1354 | end: | |
1355 | return ret_code; | |
1356 | } | |
1357 | ||
4cbc1a04 DG |
1358 | /* |
1359 | * Receive command from session daemon and process it. | |
1360 | * | |
1361 | * Return 1 on success else a negative value or 0. | |
1362 | */ | |
3bd1e081 MD |
1363 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1364 | int sock, struct pollfd *consumer_sockpoll) | |
1365 | { | |
594c7c00 | 1366 | int ret_func; |
0c759fc9 | 1367 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
3bd1e081 | 1368 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1369 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1370 | |
9ce5646a MD |
1371 | health_code_update(); |
1372 | ||
594c7c00 SM |
1373 | { |
1374 | ssize_t ret_recv; | |
1375 | ||
1376 | ret_recv = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); | |
1377 | if (ret_recv != sizeof(msg)) { | |
1378 | DBG("Consumer received unexpected message size %zd (expects %zu)", | |
1379 | ret_recv, sizeof(msg)); | |
1380 | /* | |
1381 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1382 | * since the caller handles this. | |
1383 | */ | |
1384 | if (ret_recv > 0) { | |
1385 | lttng_consumer_send_error(ctx, | |
1386 | LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
1387 | ret_recv = -1; | |
1388 | } | |
1389 | return ret_recv; | |
489f70e9 | 1390 | } |
3bd1e081 | 1391 | } |
9ce5646a MD |
1392 | |
1393 | health_code_update(); | |
1394 | ||
84382d49 MD |
1395 | /* deprecated */ |
1396 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); | |
3bd1e081 | 1397 | |
9ce5646a MD |
1398 | health_code_update(); |
1399 | ||
3f8e211f | 1400 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1401 | rcu_read_lock(); |
1402 | ||
3bd1e081 | 1403 | switch (msg.cmd_type) { |
00e2e675 DG |
1404 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1405 | { | |
f50f23d9 | 1406 | /* Session daemon status message are handled in the following call. */ |
2527bf85 | 1407 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
7735ef9e | 1408 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
d3e2ba59 JD |
1409 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1410 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1411 | goto end_nosignal; |
1412 | } | |
173af62f DG |
1413 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1414 | { | |
a6ba4fe1 | 1415 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1416 | struct consumer_relayd_sock_pair *relayd; |
1417 | ||
a6ba4fe1 | 1418 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1419 | |
1420 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1421 | relayd = consumer_find_relayd(index); |
173af62f | 1422 | if (relayd == NULL) { |
3448e266 | 1423 | DBG("Unable to find relayd %" PRIu64, index); |
e462382a | 1424 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
173af62f DG |
1425 | } |
1426 | ||
a6ba4fe1 DG |
1427 | /* |
1428 | * Each relayd socket pair has a refcount of stream attached to it | |
1429 | * which tells if the relayd is still active or not depending on the | |
1430 | * refcount value. | |
1431 | * | |
1432 | * This will set the destroy flag of the relayd object and destroy it | |
1433 | * if the refcount reaches zero when called. | |
1434 | * | |
1435 | * The destroy can happen either here or when a stream fd hangs up. | |
1436 | */ | |
f50f23d9 DG |
1437 | if (relayd) { |
1438 | consumer_flag_relayd_for_destroy(relayd); | |
1439 | } | |
1440 | ||
d88aee68 | 1441 | goto end_msg_sessiond; |
173af62f | 1442 | } |
3bd1e081 MD |
1443 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1444 | { | |
3f8e211f | 1445 | rcu_read_unlock(); |
7ad0a0cb | 1446 | return -ENOSYS; |
3bd1e081 | 1447 | } |
6d805429 | 1448 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1449 | { |
594c7c00 SM |
1450 | int is_data_pending; |
1451 | ssize_t ret_send; | |
6d805429 | 1452 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1453 | |
6d805429 | 1454 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1455 | |
3be74084 | 1456 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1457 | |
1458 | /* Send back returned value to session daemon */ | |
594c7c00 | 1459 | ret_send = lttcomm_send_unix_sock(sock, &is_data_pending, |
3be74084 | 1460 | sizeof(is_data_pending)); |
594c7c00 SM |
1461 | if (ret_send < 0) { |
1462 | DBG("Error when sending the data pending ret code: %zd", | |
1463 | ret_send); | |
489f70e9 | 1464 | goto error_fatal; |
ca22feea | 1465 | } |
f50f23d9 DG |
1466 | |
1467 | /* | |
1468 | * No need to send back a status message since the data pending | |
1469 | * returned value is the response. | |
1470 | */ | |
ca22feea | 1471 | break; |
53632229 | 1472 | } |
ffe60014 DG |
1473 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1474 | { | |
594c7c00 | 1475 | int ret_ask_channel, ret_add_channel, ret_send; |
ffe60014 | 1476 | struct ustctl_consumer_channel_attr attr; |
d2956687 JG |
1477 | const uint64_t chunk_id = msg.u.ask_channel.chunk_id.value; |
1478 | const struct lttng_credentials buffer_credentials = { | |
ff588497 JR |
1479 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.uid), |
1480 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.ask_channel.buffer_credentials.gid), | |
d2956687 | 1481 | }; |
ffe60014 DG |
1482 | |
1483 | /* Create a plain object and reserve a channel key. */ | |
a2814ea7 JG |
1484 | channel = consumer_allocate_channel( |
1485 | msg.u.ask_channel.key, | |
1486 | msg.u.ask_channel.session_id, | |
d2956687 JG |
1487 | msg.u.ask_channel.chunk_id.is_set ? |
1488 | &chunk_id : NULL, | |
1489 | msg.u.ask_channel.pathname, | |
1490 | msg.u.ask_channel.name, | |
1491 | msg.u.ask_channel.relayd_id, | |
1624d5b7 JD |
1492 | (enum lttng_event_output) msg.u.ask_channel.output, |
1493 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1494 | msg.u.ask_channel.tracefile_count, |
1950109e | 1495 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 | 1496 | msg.u.ask_channel.monitor, |
d7ba1388 | 1497 | msg.u.ask_channel.live_timer_interval, |
a2814ea7 | 1498 | msg.u.ask_channel.is_live, |
3d071855 | 1499 | msg.u.ask_channel.root_shm_path, |
d7ba1388 | 1500 | msg.u.ask_channel.shm_path); |
ffe60014 DG |
1501 | if (!channel) { |
1502 | goto end_channel_error; | |
1503 | } | |
1504 | ||
d2956687 JG |
1505 | LTTNG_OPTIONAL_SET(&channel->buffer_credentials, |
1506 | buffer_credentials); | |
1507 | ||
567eb353 DG |
1508 | /* |
1509 | * Assign UST application UID to the channel. This value is ignored for | |
1510 | * per PID buffers. This is specific to UST thus setting this after the | |
1511 | * allocation. | |
1512 | */ | |
1513 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1514 | ||
ffe60014 DG |
1515 | /* Build channel attributes from received message. */ |
1516 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1517 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1518 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1519 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1520 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1521 | attr.chan_id = msg.u.ask_channel.chan_id; |
ffe60014 | 1522 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
491d1539 | 1523 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
ffe60014 | 1524 | |
0c759fc9 DG |
1525 | /* Match channel buffer type to the UST abi. */ |
1526 | switch (msg.u.ask_channel.output) { | |
1527 | case LTTNG_EVENT_MMAP: | |
1528 | default: | |
fc4b93fa | 1529 | attr.output = LTTNG_UST_ABI_MMAP; |
0c759fc9 DG |
1530 | break; |
1531 | } | |
1532 | ||
ffe60014 DG |
1533 | /* Translate and save channel type. */ |
1534 | switch (msg.u.ask_channel.type) { | |
fc4b93fa | 1535 | case LTTNG_UST_ABI_CHAN_PER_CPU: |
ffe60014 | 1536 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
fc4b93fa | 1537 | attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; |
8633d6e3 MD |
1538 | /* |
1539 | * Set refcount to 1 for owner. Below, we will | |
1540 | * pass ownership to the | |
1541 | * consumer_thread_channel_poll() thread. | |
1542 | */ | |
1543 | channel->refcount = 1; | |
ffe60014 | 1544 | break; |
fc4b93fa | 1545 | case LTTNG_UST_ABI_CHAN_METADATA: |
ffe60014 | 1546 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
fc4b93fa | 1547 | attr.type = LTTNG_UST_ABI_CHAN_METADATA; |
ffe60014 DG |
1548 | break; |
1549 | default: | |
1550 | assert(0); | |
1551 | goto error_fatal; | |
1552 | }; | |
1553 | ||
9ce5646a MD |
1554 | health_code_update(); |
1555 | ||
594c7c00 SM |
1556 | ret_ask_channel = ask_channel(ctx, channel, &attr); |
1557 | if (ret_ask_channel < 0) { | |
ffe60014 DG |
1558 | goto end_channel_error; |
1559 | } | |
1560 | ||
fc4b93fa | 1561 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
594c7c00 SM |
1562 | int ret_allocate; |
1563 | ||
1564 | ret_allocate = consumer_metadata_cache_allocate( | |
1565 | channel); | |
1566 | if (ret_allocate < 0) { | |
fc643247 MD |
1567 | ERR("Allocating metadata cache"); |
1568 | goto end_channel_error; | |
1569 | } | |
1570 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1571 | attr.switch_timer_interval = 0; | |
94d49140 | 1572 | } else { |
e9404c27 JG |
1573 | int monitor_start_ret; |
1574 | ||
94d49140 JD |
1575 | consumer_timer_live_start(channel, |
1576 | msg.u.ask_channel.live_timer_interval); | |
e9404c27 JG |
1577 | monitor_start_ret = consumer_timer_monitor_start( |
1578 | channel, | |
1579 | msg.u.ask_channel.monitor_timer_interval); | |
1580 | if (monitor_start_ret < 0) { | |
1581 | ERR("Starting channel monitoring timer failed"); | |
1582 | goto end_channel_error; | |
1583 | } | |
fc643247 MD |
1584 | } |
1585 | ||
9ce5646a MD |
1586 | health_code_update(); |
1587 | ||
ffe60014 DG |
1588 | /* |
1589 | * Add the channel to the internal state AFTER all streams were created | |
1590 | * and successfully sent to session daemon. This way, all streams must | |
1591 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1592 | * If add_channel succeeds, ownership of the channel is |
1593 | * passed to consumer_thread_channel_poll(). | |
ffe60014 | 1594 | */ |
594c7c00 SM |
1595 | ret_add_channel = add_channel(channel, ctx); |
1596 | if (ret_add_channel < 0) { | |
fc4b93fa | 1597 | if (msg.u.ask_channel.type == LTTNG_UST_ABI_CHAN_METADATA) { |
ea88ca2a MD |
1598 | if (channel->switch_timer_enabled == 1) { |
1599 | consumer_timer_switch_stop(channel); | |
1600 | } | |
1601 | consumer_metadata_cache_destroy(channel); | |
1602 | } | |
d3e2ba59 JD |
1603 | if (channel->live_timer_enabled == 1) { |
1604 | consumer_timer_live_stop(channel); | |
1605 | } | |
e9404c27 JG |
1606 | if (channel->monitor_timer_enabled == 1) { |
1607 | consumer_timer_monitor_stop(channel); | |
1608 | } | |
ffe60014 DG |
1609 | goto end_channel_error; |
1610 | } | |
1611 | ||
9ce5646a MD |
1612 | health_code_update(); |
1613 | ||
ffe60014 DG |
1614 | /* |
1615 | * Channel and streams are now created. Inform the session daemon that | |
1616 | * everything went well and should wait to receive the channel and | |
1617 | * streams with ustctl API. | |
1618 | */ | |
594c7c00 SM |
1619 | ret_send = consumer_send_status_channel(sock, channel); |
1620 | if (ret_send < 0) { | |
ffe60014 | 1621 | /* |
489f70e9 | 1622 | * There is probably a problem on the socket. |
ffe60014 | 1623 | */ |
489f70e9 | 1624 | goto error_fatal; |
ffe60014 DG |
1625 | } |
1626 | ||
1627 | break; | |
1628 | } | |
1629 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1630 | { | |
1631 | int ret, relayd_err = 0; | |
d88aee68 | 1632 | uint64_t key = msg.u.get_channel.key; |
594c7c00 | 1633 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1634 | |
594c7c00 SM |
1635 | found_channel = consumer_find_channel(key); |
1636 | if (!found_channel) { | |
8fd623e0 | 1637 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
e462382a | 1638 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
f3a1fc7b | 1639 | goto end_get_channel; |
ffe60014 DG |
1640 | } |
1641 | ||
9ce5646a MD |
1642 | health_code_update(); |
1643 | ||
a3a86f35 | 1644 | /* Send the channel to sessiond (and relayd, if applicable). */ |
594c7c00 SM |
1645 | ret = send_channel_to_sessiond_and_relayd( |
1646 | sock, found_channel, ctx, &relayd_err); | |
ffe60014 DG |
1647 | if (ret < 0) { |
1648 | if (relayd_err) { | |
1649 | /* | |
1650 | * We were unable to send to the relayd the stream so avoid | |
1651 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1652 | * and the consumer can continue its work. The above call |
1653 | * has sent the error status message to the sessiond. | |
ffe60014 | 1654 | */ |
f3a1fc7b | 1655 | goto end_get_channel_nosignal; |
ffe60014 DG |
1656 | } |
1657 | /* | |
1658 | * The communicaton was broken hence there is a bad state between | |
1659 | * the consumer and sessiond so stop everything. | |
1660 | */ | |
f3a1fc7b | 1661 | goto error_get_channel_fatal; |
ffe60014 DG |
1662 | } |
1663 | ||
9ce5646a MD |
1664 | health_code_update(); |
1665 | ||
10a50311 JD |
1666 | /* |
1667 | * In no monitor mode, the streams ownership is kept inside the channel | |
1668 | * so don't send them to the data thread. | |
1669 | */ | |
594c7c00 | 1670 | if (!found_channel->monitor) { |
f3a1fc7b | 1671 | goto end_get_channel; |
10a50311 JD |
1672 | } |
1673 | ||
594c7c00 | 1674 | ret = send_streams_to_thread(found_channel, ctx); |
d88aee68 DG |
1675 | if (ret < 0) { |
1676 | /* | |
1677 | * If we are unable to send the stream to the thread, there is | |
1678 | * a big problem so just stop everything. | |
1679 | */ | |
f3a1fc7b | 1680 | goto error_get_channel_fatal; |
ffe60014 | 1681 | } |
ffe60014 | 1682 | /* List MUST be empty after or else it could be reused. */ |
594c7c00 | 1683 | assert(cds_list_empty(&found_channel->streams.head)); |
f3a1fc7b | 1684 | end_get_channel: |
d88aee68 | 1685 | goto end_msg_sessiond; |
f3a1fc7b JG |
1686 | error_get_channel_fatal: |
1687 | goto error_fatal; | |
1688 | end_get_channel_nosignal: | |
1689 | goto end_nosignal; | |
d88aee68 DG |
1690 | } |
1691 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1692 | { | |
1693 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1694 | |
a0cbdd2e MD |
1695 | /* |
1696 | * Only called if streams have not been sent to stream | |
1697 | * manager thread. However, channel has been sent to | |
1698 | * channel manager thread. | |
1699 | */ | |
1700 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1701 | goto end_msg_sessiond; |
ffe60014 | 1702 | } |
d88aee68 DG |
1703 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1704 | { | |
1705 | int ret; | |
1706 | ||
1707 | ret = close_metadata(msg.u.close_metadata.key); | |
1708 | if (ret != 0) { | |
1709 | ret_code = ret; | |
1710 | } | |
1711 | ||
1712 | goto end_msg_sessiond; | |
1713 | } | |
7972aab2 DG |
1714 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1715 | { | |
1716 | int ret; | |
1717 | ||
1718 | ret = flush_channel(msg.u.flush_channel.key); | |
1719 | if (ret != 0) { | |
1720 | ret_code = ret; | |
1721 | } | |
1722 | ||
1723 | goto end_msg_sessiond; | |
1724 | } | |
0dd01979 MD |
1725 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
1726 | { | |
1727 | int ret; | |
1728 | ||
1729 | ret = clear_quiescent_channel( | |
1730 | msg.u.clear_quiescent_channel.key); | |
1731 | if (ret != 0) { | |
1732 | ret_code = ret; | |
1733 | } | |
1734 | ||
1735 | goto end_msg_sessiond; | |
1736 | } | |
d88aee68 | 1737 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1738 | { |
1739 | int ret; | |
d88aee68 | 1740 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1741 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1742 | uint64_t offset = msg.u.push_metadata.target_offset; |
93ec662e | 1743 | uint64_t version = msg.u.push_metadata.version; |
594c7c00 | 1744 | struct lttng_consumer_channel *found_channel; |
ffe60014 | 1745 | |
8fd623e0 DG |
1746 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1747 | len); | |
ffe60014 | 1748 | |
594c7c00 SM |
1749 | found_channel = consumer_find_channel(key); |
1750 | if (!found_channel) { | |
000baf6a DG |
1751 | /* |
1752 | * This is possible if the metadata creation on the consumer side | |
1753 | * is in flight vis-a-vis a concurrent push metadata from the | |
1754 | * session daemon. Simply return that the channel failed and the | |
1755 | * session daemon will handle that message correctly considering | |
1756 | * that this race is acceptable thus the DBG() statement here. | |
1757 | */ | |
1758 | DBG("UST consumer push metadata %" PRIu64 " not found", key); | |
1759 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; | |
a8ffe244 | 1760 | goto end_push_metadata_msg_sessiond; |
d88aee68 DG |
1761 | } |
1762 | ||
9ce5646a MD |
1763 | health_code_update(); |
1764 | ||
c585821b MD |
1765 | if (!len) { |
1766 | /* | |
1767 | * There is nothing to receive. We have simply | |
1768 | * checked whether the channel can be found. | |
1769 | */ | |
1770 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
a8ffe244 | 1771 | goto end_push_metadata_msg_sessiond; |
c585821b MD |
1772 | } |
1773 | ||
d88aee68 | 1774 | /* Tell session daemon we are ready to receive the metadata. */ |
0c759fc9 | 1775 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
ffe60014 DG |
1776 | if (ret < 0) { |
1777 | /* Somehow, the session daemon is not responding anymore. */ | |
a8ffe244 | 1778 | goto error_push_metadata_fatal; |
d88aee68 DG |
1779 | } |
1780 | ||
9ce5646a MD |
1781 | health_code_update(); |
1782 | ||
d88aee68 | 1783 | /* Wait for more data. */ |
9ce5646a MD |
1784 | health_poll_entry(); |
1785 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1786 | health_poll_exit(); | |
84382d49 | 1787 | if (ret) { |
a8ffe244 | 1788 | goto error_push_metadata_fatal; |
d88aee68 DG |
1789 | } |
1790 | ||
9ce5646a MD |
1791 | health_code_update(); |
1792 | ||
594c7c00 SM |
1793 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, len, |
1794 | version, found_channel, 0, 1); | |
d88aee68 | 1795 | if (ret < 0) { |
331744e3 | 1796 | /* error receiving from sessiond */ |
a8ffe244 | 1797 | goto error_push_metadata_fatal; |
331744e3 JD |
1798 | } else { |
1799 | ret_code = ret; | |
a8ffe244 | 1800 | goto end_push_metadata_msg_sessiond; |
d88aee68 | 1801 | } |
a8ffe244 JG |
1802 | end_push_metadata_msg_sessiond: |
1803 | goto end_msg_sessiond; | |
1804 | error_push_metadata_fatal: | |
1805 | goto error_fatal; | |
d88aee68 DG |
1806 | } |
1807 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1808 | { | |
1809 | int ret; | |
1810 | ||
1811 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1812 | if (ret) { | |
1813 | ret_code = ret; | |
1814 | } | |
1815 | goto end_msg_sessiond; | |
ffe60014 | 1816 | } |
6dc3064a DG |
1817 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1818 | { | |
594c7c00 | 1819 | struct lttng_consumer_channel *found_channel; |
3eb928aa | 1820 | uint64_t key = msg.u.snapshot_channel.key; |
594c7c00 | 1821 | int ret_send; |
3eb928aa | 1822 | |
594c7c00 SM |
1823 | found_channel = consumer_find_channel(key); |
1824 | if (!found_channel) { | |
3eb928aa MD |
1825 | DBG("UST snapshot channel not found for key %" PRIu64, key); |
1826 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
10a50311 | 1827 | } else { |
3eb928aa | 1828 | if (msg.u.snapshot_channel.metadata) { |
594c7c00 SM |
1829 | int ret_snapshot; |
1830 | ||
1831 | ret_snapshot = snapshot_metadata(found_channel, | |
1832 | key, | |
3eb928aa MD |
1833 | msg.u.snapshot_channel.pathname, |
1834 | msg.u.snapshot_channel.relayd_id, | |
d2956687 | 1835 | ctx); |
594c7c00 | 1836 | if (ret_snapshot < 0) { |
3eb928aa MD |
1837 | ERR("Snapshot metadata failed"); |
1838 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1839 | } | |
1840 | } else { | |
594c7c00 SM |
1841 | int ret_snapshot; |
1842 | ||
1843 | ret_snapshot = snapshot_channel(found_channel, | |
1844 | key, | |
3eb928aa MD |
1845 | msg.u.snapshot_channel.pathname, |
1846 | msg.u.snapshot_channel.relayd_id, | |
594c7c00 SM |
1847 | msg.u.snapshot_channel |
1848 | .nb_packets_per_stream, | |
3eb928aa | 1849 | ctx); |
594c7c00 | 1850 | if (ret_snapshot < 0) { |
3eb928aa MD |
1851 | ERR("Snapshot channel failed"); |
1852 | ret_code = LTTCOMM_CONSUMERD_SNAPSHOT_FAILED; | |
1853 | } | |
10a50311 JD |
1854 | } |
1855 | } | |
9ce5646a | 1856 | health_code_update(); |
594c7c00 SM |
1857 | ret_send = consumer_send_status_msg(sock, ret_code); |
1858 | if (ret_send < 0) { | |
6dc3064a DG |
1859 | /* Somehow, the session daemon is not responding anymore. */ |
1860 | goto end_nosignal; | |
1861 | } | |
9ce5646a | 1862 | health_code_update(); |
6dc3064a DG |
1863 | break; |
1864 | } | |
fb83fe64 JD |
1865 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
1866 | { | |
beb59458 MJ |
1867 | int ret = 0; |
1868 | uint64_t discarded_events; | |
fb83fe64 JD |
1869 | struct lttng_ht_iter iter; |
1870 | struct lttng_ht *ht; | |
1871 | struct lttng_consumer_stream *stream; | |
1872 | uint64_t id = msg.u.discarded_events.session_id; | |
1873 | uint64_t key = msg.u.discarded_events.channel_key; | |
1874 | ||
1875 | DBG("UST consumer discarded events command for session id %" | |
1876 | PRIu64, id); | |
1877 | rcu_read_lock(); | |
fa29bfbf | 1878 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1879 | |
fa29bfbf | 1880 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1881 | |
1882 | /* | |
1883 | * We only need a reference to the channel, but they are not | |
1884 | * directly indexed, so we just use the first matching stream | |
1885 | * to extract the information we need, we default to 0 if not | |
1886 | * found (no events are dropped if the channel is not yet in | |
1887 | * use). | |
1888 | */ | |
beb59458 | 1889 | discarded_events = 0; |
fb83fe64 JD |
1890 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1891 | ht->hash_fct(&id, lttng_ht_seed), | |
1892 | ht->match_fct, &id, | |
1893 | &iter.iter, stream, node_session_id.node) { | |
1894 | if (stream->chan->key == key) { | |
beb59458 | 1895 | discarded_events = stream->chan->discarded_events; |
fb83fe64 JD |
1896 | break; |
1897 | } | |
1898 | } | |
fa29bfbf | 1899 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1900 | rcu_read_unlock(); |
1901 | ||
1902 | DBG("UST consumer discarded events command for session id %" | |
1903 | PRIu64 ", channel key %" PRIu64, id, key); | |
1904 | ||
1905 | health_code_update(); | |
1906 | ||
1907 | /* Send back returned value to session daemon */ | |
beb59458 | 1908 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
fb83fe64 JD |
1909 | if (ret < 0) { |
1910 | PERROR("send discarded events"); | |
1911 | goto error_fatal; | |
1912 | } | |
1913 | ||
1914 | break; | |
1915 | } | |
1916 | case LTTNG_CONSUMER_LOST_PACKETS: | |
1917 | { | |
9a06e8d4 JG |
1918 | int ret; |
1919 | uint64_t lost_packets; | |
fb83fe64 JD |
1920 | struct lttng_ht_iter iter; |
1921 | struct lttng_ht *ht; | |
1922 | struct lttng_consumer_stream *stream; | |
1923 | uint64_t id = msg.u.lost_packets.session_id; | |
1924 | uint64_t key = msg.u.lost_packets.channel_key; | |
1925 | ||
1926 | DBG("UST consumer lost packets command for session id %" | |
1927 | PRIu64, id); | |
1928 | rcu_read_lock(); | |
fa29bfbf | 1929 | pthread_mutex_lock(&the_consumer_data.lock); |
fb83fe64 | 1930 | |
fa29bfbf | 1931 | ht = the_consumer_data.stream_list_ht; |
fb83fe64 JD |
1932 | |
1933 | /* | |
1934 | * We only need a reference to the channel, but they are not | |
1935 | * directly indexed, so we just use the first matching stream | |
1936 | * to extract the information we need, we default to 0 if not | |
1937 | * found (no packets lost if the channel is not yet in use). | |
1938 | */ | |
9a06e8d4 | 1939 | lost_packets = 0; |
fb83fe64 JD |
1940 | cds_lfht_for_each_entry_duplicate(ht->ht, |
1941 | ht->hash_fct(&id, lttng_ht_seed), | |
1942 | ht->match_fct, &id, | |
1943 | &iter.iter, stream, node_session_id.node) { | |
1944 | if (stream->chan->key == key) { | |
9a06e8d4 | 1945 | lost_packets = stream->chan->lost_packets; |
fb83fe64 JD |
1946 | break; |
1947 | } | |
1948 | } | |
fa29bfbf | 1949 | pthread_mutex_unlock(&the_consumer_data.lock); |
fb83fe64 JD |
1950 | rcu_read_unlock(); |
1951 | ||
1952 | DBG("UST consumer lost packets command for session id %" | |
1953 | PRIu64 ", channel key %" PRIu64, id, key); | |
1954 | ||
1955 | health_code_update(); | |
1956 | ||
1957 | /* Send back returned value to session daemon */ | |
9a06e8d4 JG |
1958 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
1959 | sizeof(lost_packets)); | |
fb83fe64 JD |
1960 | if (ret < 0) { |
1961 | PERROR("send lost packets"); | |
1962 | goto error_fatal; | |
1963 | } | |
1964 | ||
1965 | break; | |
1966 | } | |
b3530820 JG |
1967 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
1968 | { | |
594c7c00 SM |
1969 | int channel_monitor_pipe, ret_send, |
1970 | ret_set_channel_monitor_pipe; | |
1971 | ssize_t ret_recv; | |
b3530820 JG |
1972 | |
1973 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1974 | /* Successfully received the command's type. */ | |
594c7c00 SM |
1975 | ret_send = consumer_send_status_msg(sock, ret_code); |
1976 | if (ret_send < 0) { | |
b3530820 JG |
1977 | goto error_fatal; |
1978 | } | |
1979 | ||
594c7c00 SM |
1980 | ret_recv = lttcomm_recv_fds_unix_sock( |
1981 | sock, &channel_monitor_pipe, 1); | |
1982 | if (ret_recv != sizeof(channel_monitor_pipe)) { | |
b3530820 JG |
1983 | ERR("Failed to receive channel monitor pipe"); |
1984 | goto error_fatal; | |
1985 | } | |
1986 | ||
1987 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); | |
594c7c00 SM |
1988 | ret_set_channel_monitor_pipe = |
1989 | consumer_timer_thread_set_channel_monitor_pipe( | |
1990 | channel_monitor_pipe); | |
1991 | if (!ret_set_channel_monitor_pipe) { | |
b3530820 | 1992 | int flags; |
594c7c00 | 1993 | int ret_fcntl; |
b3530820 JG |
1994 | |
1995 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; | |
1996 | /* Set the pipe as non-blocking. */ | |
594c7c00 SM |
1997 | ret_fcntl = fcntl(channel_monitor_pipe, F_GETFL, 0); |
1998 | if (ret_fcntl == -1) { | |
b3530820 JG |
1999 | PERROR("fcntl get flags of the channel monitoring pipe"); |
2000 | goto error_fatal; | |
2001 | } | |
594c7c00 | 2002 | flags = ret_fcntl; |
b3530820 | 2003 | |
594c7c00 | 2004 | ret_fcntl = fcntl(channel_monitor_pipe, F_SETFL, |
b3530820 | 2005 | flags | O_NONBLOCK); |
594c7c00 | 2006 | if (ret_fcntl == -1) { |
b3530820 JG |
2007 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
2008 | goto error_fatal; | |
2009 | } | |
2010 | DBG("Channel monitor pipe set as non-blocking"); | |
2011 | } else { | |
2012 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; | |
2013 | } | |
2014 | goto end_msg_sessiond; | |
2015 | } | |
b99a8d42 JD |
2016 | case LTTNG_CONSUMER_ROTATE_CHANNEL: |
2017 | { | |
594c7c00 | 2018 | struct lttng_consumer_channel *found_channel; |
92b7a7f8 | 2019 | uint64_t key = msg.u.rotate_channel.key; |
594c7c00 | 2020 | int ret_send_status; |
b99a8d42 | 2021 | |
594c7c00 SM |
2022 | found_channel = consumer_find_channel(key); |
2023 | if (!found_channel) { | |
92b7a7f8 MD |
2024 | DBG("Channel %" PRIu64 " not found", key); |
2025 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2026 | } else { | |
594c7c00 SM |
2027 | int rotate_channel; |
2028 | ||
92b7a7f8 MD |
2029 | /* |
2030 | * Sample the rotate position of all the streams in | |
2031 | * this channel. | |
2032 | */ | |
594c7c00 SM |
2033 | rotate_channel = lttng_consumer_rotate_channel( |
2034 | found_channel, key, | |
92b7a7f8 | 2035 | msg.u.rotate_channel.relayd_id, |
594c7c00 SM |
2036 | msg.u.rotate_channel.metadata, ctx); |
2037 | if (rotate_channel < 0) { | |
92b7a7f8 MD |
2038 | ERR("Rotate channel failed"); |
2039 | ret_code = LTTCOMM_CONSUMERD_ROTATION_FAIL; | |
2040 | } | |
b99a8d42 | 2041 | |
92b7a7f8 MD |
2042 | health_code_update(); |
2043 | } | |
594c7c00 SM |
2044 | |
2045 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2046 | if (ret_send_status < 0) { | |
b99a8d42 | 2047 | /* Somehow, the session daemon is not responding anymore. */ |
41c7a76d | 2048 | goto end_rotate_channel_nosignal; |
b99a8d42 JD |
2049 | } |
2050 | ||
2051 | /* | |
2052 | * Rotate the streams that are ready right now. | |
2053 | * FIXME: this is a second consecutive iteration over the | |
2054 | * streams in a channel, there is probably a better way to | |
2055 | * handle this, but it needs to be after the | |
2056 | * consumer_send_status_msg() call. | |
2057 | */ | |
594c7c00 SM |
2058 | if (found_channel) { |
2059 | int ret_rotate_read_streams; | |
2060 | ||
2061 | ret_rotate_read_streams = | |
2062 | lttng_consumer_rotate_ready_streams( | |
2063 | found_channel, key, | |
2064 | ctx); | |
2065 | if (ret_rotate_read_streams < 0) { | |
92b7a7f8 MD |
2066 | ERR("Rotate channel failed"); |
2067 | } | |
b99a8d42 JD |
2068 | } |
2069 | break; | |
41c7a76d JG |
2070 | end_rotate_channel_nosignal: |
2071 | goto end_nosignal; | |
b99a8d42 | 2072 | } |
5f3aff8b MD |
2073 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
2074 | { | |
594c7c00 | 2075 | struct lttng_consumer_channel *found_channel; |
5f3aff8b | 2076 | uint64_t key = msg.u.clear_channel.key; |
594c7c00 | 2077 | int ret_send_status; |
5f3aff8b | 2078 | |
594c7c00 SM |
2079 | found_channel = consumer_find_channel(key); |
2080 | if (!found_channel) { | |
5f3aff8b MD |
2081 | DBG("Channel %" PRIu64 " not found", key); |
2082 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2083 | } else { | |
594c7c00 SM |
2084 | int ret_clear_channel; |
2085 | ||
2086 | ret_clear_channel = lttng_consumer_clear_channel( | |
2087 | found_channel); | |
2088 | if (ret_clear_channel) { | |
5f3aff8b | 2089 | ERR("Clear channel failed key %" PRIu64, key); |
594c7c00 | 2090 | ret_code = ret_clear_channel; |
5f3aff8b MD |
2091 | } |
2092 | ||
2093 | health_code_update(); | |
2094 | } | |
594c7c00 SM |
2095 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2096 | if (ret_send_status < 0) { | |
5f3aff8b MD |
2097 | /* Somehow, the session daemon is not responding anymore. */ |
2098 | goto end_nosignal; | |
2099 | } | |
2100 | break; | |
2101 | } | |
d2956687 | 2102 | case LTTNG_CONSUMER_INIT: |
00fb02ac | 2103 | { |
594c7c00 SM |
2104 | int ret_send_status; |
2105 | ||
d2956687 JG |
2106 | ret_code = lttng_consumer_init_command(ctx, |
2107 | msg.u.init.sessiond_uuid); | |
d88744a4 | 2108 | health_code_update(); |
594c7c00 SM |
2109 | ret_send_status = consumer_send_status_msg(sock, ret_code); |
2110 | if (ret_send_status < 0) { | |
d88744a4 JD |
2111 | /* Somehow, the session daemon is not responding anymore. */ |
2112 | goto end_nosignal; | |
2113 | } | |
2114 | break; | |
2115 | } | |
d2956687 | 2116 | case LTTNG_CONSUMER_CREATE_TRACE_CHUNK: |
d88744a4 | 2117 | { |
d2956687 | 2118 | const struct lttng_credentials credentials = { |
ff588497 JR |
2119 | .uid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.uid), |
2120 | .gid = LTTNG_OPTIONAL_INIT_VALUE(msg.u.create_trace_chunk.credentials.value.gid), | |
d2956687 JG |
2121 | }; |
2122 | const bool is_local_trace = | |
2123 | !msg.u.create_trace_chunk.relayd_id.is_set; | |
2124 | const uint64_t relayd_id = | |
2125 | msg.u.create_trace_chunk.relayd_id.value; | |
2126 | const char *chunk_override_name = | |
2127 | *msg.u.create_trace_chunk.override_name ? | |
2128 | msg.u.create_trace_chunk.override_name : | |
2129 | NULL; | |
cbf53d23 | 2130 | struct lttng_directory_handle *chunk_directory_handle = NULL; |
d88744a4 | 2131 | |
d2956687 JG |
2132 | /* |
2133 | * The session daemon will only provide a chunk directory file | |
2134 | * descriptor for local traces. | |
2135 | */ | |
2136 | if (is_local_trace) { | |
2137 | int chunk_dirfd; | |
594c7c00 SM |
2138 | int ret_send_status; |
2139 | ssize_t ret_recv; | |
19990ed5 | 2140 | |
d2956687 | 2141 | /* Acnowledge the reception of the command. */ |
594c7c00 SM |
2142 | ret_send_status = consumer_send_status_msg( |
2143 | sock, LTTCOMM_CONSUMERD_SUCCESS); | |
2144 | if (ret_send_status < 0) { | |
d2956687 JG |
2145 | /* Somehow, the session daemon is not responding anymore. */ |
2146 | goto end_nosignal; | |
2147 | } | |
92816cc3 | 2148 | |
5da88b0f MD |
2149 | /* |
2150 | * Receive trace chunk domain dirfd. | |
2151 | */ | |
594c7c00 SM |
2152 | ret_recv = lttcomm_recv_fds_unix_sock( |
2153 | sock, &chunk_dirfd, 1); | |
2154 | if (ret_recv != sizeof(chunk_dirfd)) { | |
5da88b0f | 2155 | ERR("Failed to receive trace chunk domain directory file descriptor"); |
d2956687 JG |
2156 | goto error_fatal; |
2157 | } | |
92816cc3 | 2158 | |
5da88b0f | 2159 | DBG("Received trace chunk domain directory fd (%d)", |
d2956687 | 2160 | chunk_dirfd); |
cbf53d23 | 2161 | chunk_directory_handle = lttng_directory_handle_create_from_dirfd( |
d2956687 | 2162 | chunk_dirfd); |
cbf53d23 | 2163 | if (!chunk_directory_handle) { |
5da88b0f | 2164 | ERR("Failed to initialize chunk domain directory handle from directory file descriptor"); |
d2956687 JG |
2165 | if (close(chunk_dirfd)) { |
2166 | PERROR("Failed to close chunk directory file descriptor"); | |
2167 | } | |
2168 | goto error_fatal; | |
2169 | } | |
92816cc3 JG |
2170 | } |
2171 | ||
d2956687 JG |
2172 | ret_code = lttng_consumer_create_trace_chunk( |
2173 | !is_local_trace ? &relayd_id : NULL, | |
2174 | msg.u.create_trace_chunk.session_id, | |
2175 | msg.u.create_trace_chunk.chunk_id, | |
e5add6d0 JG |
2176 | (time_t) msg.u.create_trace_chunk |
2177 | .creation_timestamp, | |
d2956687 | 2178 | chunk_override_name, |
e5add6d0 JG |
2179 | msg.u.create_trace_chunk.credentials.is_set ? |
2180 | &credentials : | |
2181 | NULL, | |
cbf53d23 JG |
2182 | chunk_directory_handle); |
2183 | lttng_directory_handle_put(chunk_directory_handle); | |
d2956687 | 2184 | goto end_msg_sessiond; |
00fb02ac | 2185 | } |
d2956687 | 2186 | case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK: |
a1ae2ea5 | 2187 | { |
bbc4768c JG |
2188 | enum lttng_trace_chunk_command_type close_command = |
2189 | msg.u.close_trace_chunk.close_command.value; | |
d2956687 JG |
2190 | const uint64_t relayd_id = |
2191 | msg.u.close_trace_chunk.relayd_id.value; | |
ecd1a12f MD |
2192 | struct lttcomm_consumer_close_trace_chunk_reply reply; |
2193 | char closed_trace_chunk_path[LTTNG_PATH_MAX]; | |
2194 | int ret; | |
d2956687 JG |
2195 | |
2196 | ret_code = lttng_consumer_close_trace_chunk( | |
2197 | msg.u.close_trace_chunk.relayd_id.is_set ? | |
bbc4768c JG |
2198 | &relayd_id : |
2199 | NULL, | |
d2956687 JG |
2200 | msg.u.close_trace_chunk.session_id, |
2201 | msg.u.close_trace_chunk.chunk_id, | |
bbc4768c JG |
2202 | (time_t) msg.u.close_trace_chunk.close_timestamp, |
2203 | msg.u.close_trace_chunk.close_command.is_set ? | |
2204 | &close_command : | |
ecd1a12f MD |
2205 | NULL, closed_trace_chunk_path); |
2206 | reply.ret_code = ret_code; | |
2207 | reply.path_length = strlen(closed_trace_chunk_path) + 1; | |
2208 | ret = lttcomm_send_unix_sock(sock, &reply, sizeof(reply)); | |
2209 | if (ret != sizeof(reply)) { | |
2210 | goto error_fatal; | |
2211 | } | |
2212 | ret = lttcomm_send_unix_sock(sock, closed_trace_chunk_path, | |
2213 | reply.path_length); | |
2214 | if (ret != reply.path_length) { | |
2215 | goto error_fatal; | |
2216 | } | |
2217 | goto end_nosignal; | |
a1ae2ea5 | 2218 | } |
d2956687 | 2219 | case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS: |
3654ed19 | 2220 | { |
d2956687 JG |
2221 | const uint64_t relayd_id = |
2222 | msg.u.trace_chunk_exists.relayd_id.value; | |
2223 | ||
2224 | ret_code = lttng_consumer_trace_chunk_exists( | |
2225 | msg.u.trace_chunk_exists.relayd_id.is_set ? | |
2226 | &relayd_id : NULL, | |
2227 | msg.u.trace_chunk_exists.session_id, | |
2228 | msg.u.trace_chunk_exists.chunk_id); | |
2229 | goto end_msg_sessiond; | |
04ed9e10 JG |
2230 | } |
2231 | case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS: | |
2232 | { | |
2233 | const uint64_t key = msg.u.open_channel_packets.key; | |
594c7c00 | 2234 | struct lttng_consumer_channel *found_channel = |
04ed9e10 JG |
2235 | consumer_find_channel(key); |
2236 | ||
594c7c00 SM |
2237 | if (found_channel) { |
2238 | pthread_mutex_lock(&found_channel->lock); | |
2239 | ret_code = lttng_consumer_open_channel_packets( | |
2240 | found_channel); | |
2241 | pthread_mutex_unlock(&found_channel->lock); | |
04ed9e10 JG |
2242 | } else { |
2243 | /* | |
2244 | * The channel could have disappeared in per-pid | |
2245 | * buffering mode. | |
2246 | */ | |
2247 | DBG("Channel %" PRIu64 " not found", key); | |
2248 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; | |
2249 | } | |
2250 | ||
2251 | health_code_update(); | |
2252 | goto end_msg_sessiond; | |
3654ed19 | 2253 | } |
3bd1e081 MD |
2254 | default: |
2255 | break; | |
2256 | } | |
3f8e211f | 2257 | |
3bd1e081 | 2258 | end_nosignal: |
4cbc1a04 DG |
2259 | /* |
2260 | * Return 1 to indicate success since the 0 value can be a socket | |
2261 | * shutdown during the recv() or send() call. | |
2262 | */ | |
594c7c00 | 2263 | ret_func = 1; |
f3a1fc7b | 2264 | goto end; |
ffe60014 DG |
2265 | |
2266 | end_msg_sessiond: | |
2267 | /* | |
2268 | * The returned value here is not useful since either way we'll return 1 to | |
2269 | * the caller because the session daemon socket management is done | |
2270 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
2271 | */ | |
594c7c00 SM |
2272 | { |
2273 | int ret_send_status; | |
2274 | ||
2275 | ret_send_status = consumer_send_status_msg(sock, ret_code); | |
2276 | if (ret_send_status < 0) { | |
2277 | goto error_fatal; | |
2278 | } | |
489f70e9 | 2279 | } |
594c7c00 SM |
2280 | |
2281 | ret_func = 1; | |
f3a1fc7b | 2282 | goto end; |
9ce5646a | 2283 | |
ffe60014 DG |
2284 | end_channel_error: |
2285 | if (channel) { | |
2286 | /* | |
2287 | * Free channel here since no one has a reference to it. We don't | |
2288 | * free after that because a stream can store this pointer. | |
2289 | */ | |
2290 | destroy_channel(channel); | |
2291 | } | |
2292 | /* We have to send a status channel message indicating an error. */ | |
594c7c00 SM |
2293 | { |
2294 | int ret_send_status; | |
2295 | ||
2296 | ret_send_status = consumer_send_status_channel(sock, NULL); | |
2297 | if (ret_send_status < 0) { | |
2298 | /* Stop everything if session daemon can not be notified. */ | |
2299 | goto error_fatal; | |
2300 | } | |
ffe60014 | 2301 | } |
594c7c00 SM |
2302 | |
2303 | ret_func = 1; | |
f3a1fc7b | 2304 | goto end; |
9ce5646a | 2305 | |
ffe60014 | 2306 | error_fatal: |
ffe60014 | 2307 | /* This will issue a consumer stop. */ |
594c7c00 | 2308 | ret_func = -1; |
f3a1fc7b JG |
2309 | goto end; |
2310 | ||
2311 | end: | |
2312 | rcu_read_unlock(); | |
2313 | health_code_update(); | |
594c7c00 | 2314 | return ret_func; |
3bd1e081 MD |
2315 | } |
2316 | ||
fc6d7a51 JD |
2317 | void lttng_ustctl_flush_buffer(struct lttng_consumer_stream *stream, |
2318 | int producer_active) | |
2319 | { | |
2320 | assert(stream); | |
2321 | assert(stream->ustream); | |
2322 | ||
2323 | ustctl_flush_buffer(stream->ustream, producer_active); | |
2324 | } | |
2325 | ||
ffe60014 | 2326 | /* |
e9404c27 | 2327 | * Take a snapshot for a specific stream. |
ffe60014 DG |
2328 | * |
2329 | * Returns 0 on success, < 0 on error | |
2330 | */ | |
2331 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 2332 | { |
ffe60014 DG |
2333 | assert(stream); |
2334 | assert(stream->ustream); | |
2335 | ||
2336 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
2337 | } |
2338 | ||
e9404c27 JG |
2339 | /* |
2340 | * Sample consumed and produced positions for a specific stream. | |
2341 | * | |
2342 | * Returns 0 on success, < 0 on error. | |
2343 | */ | |
2344 | int lttng_ustconsumer_sample_snapshot_positions( | |
2345 | struct lttng_consumer_stream *stream) | |
2346 | { | |
2347 | assert(stream); | |
2348 | assert(stream->ustream); | |
2349 | ||
2350 | return ustctl_snapshot_sample_positions(stream->ustream); | |
2351 | } | |
2352 | ||
ffe60014 DG |
2353 | /* |
2354 | * Get the produced position | |
2355 | * | |
2356 | * Returns 0 on success, < 0 on error | |
2357 | */ | |
2358 | int lttng_ustconsumer_get_produced_snapshot( | |
2359 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 2360 | { |
ffe60014 DG |
2361 | assert(stream); |
2362 | assert(stream->ustream); | |
2363 | assert(pos); | |
7a57cf92 | 2364 | |
ffe60014 DG |
2365 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
2366 | } | |
7a57cf92 | 2367 | |
10a50311 JD |
2368 | /* |
2369 | * Get the consumed position | |
2370 | * | |
2371 | * Returns 0 on success, < 0 on error | |
2372 | */ | |
2373 | int lttng_ustconsumer_get_consumed_snapshot( | |
2374 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
2375 | { | |
2376 | assert(stream); | |
2377 | assert(stream->ustream); | |
2378 | assert(pos); | |
2379 | ||
2380 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
2381 | } | |
2382 | ||
84a182ce DG |
2383 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
2384 | int producer) | |
2385 | { | |
2386 | assert(stream); | |
2387 | assert(stream->ustream); | |
2388 | ||
2389 | ustctl_flush_buffer(stream->ustream, producer); | |
2390 | } | |
2391 | ||
214f70e0 JR |
2392 | void lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
2393 | { | |
2394 | assert(stream); | |
2395 | assert(stream->ustream); | |
2396 | ||
2397 | ustctl_clear_buffer(stream->ustream); | |
2398 | } | |
2399 | ||
84a182ce DG |
2400 | int lttng_ustconsumer_get_current_timestamp( |
2401 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
2402 | { | |
2403 | assert(stream); | |
2404 | assert(stream->ustream); | |
2405 | assert(ts); | |
2406 | ||
2407 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
2408 | } | |
2409 | ||
fb83fe64 JD |
2410 | int lttng_ustconsumer_get_sequence_number( |
2411 | struct lttng_consumer_stream *stream, uint64_t *seq) | |
2412 | { | |
2413 | assert(stream); | |
2414 | assert(stream->ustream); | |
2415 | assert(seq); | |
2416 | ||
2417 | return ustctl_get_sequence_number(stream->ustream, seq); | |
2418 | } | |
2419 | ||
ffe60014 | 2420 | /* |
0dd01979 | 2421 | * Called when the stream signals the consumer that it has hung up. |
ffe60014 DG |
2422 | */ |
2423 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
2424 | { | |
2425 | assert(stream); | |
2426 | assert(stream->ustream); | |
2c1dd183 | 2427 | |
0dd01979 MD |
2428 | pthread_mutex_lock(&stream->lock); |
2429 | if (!stream->quiescent) { | |
2430 | ustctl_flush_buffer(stream->ustream, 0); | |
2431 | stream->quiescent = true; | |
2432 | } | |
2433 | pthread_mutex_unlock(&stream->lock); | |
ffe60014 DG |
2434 | stream->hangup_flush_done = 1; |
2435 | } | |
ee77a7b0 | 2436 | |
ffe60014 DG |
2437 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
2438 | { | |
4628484a MD |
2439 | int i; |
2440 | ||
ffe60014 DG |
2441 | assert(chan); |
2442 | assert(chan->uchan); | |
d2956687 | 2443 | assert(chan->buffer_credentials.is_set); |
e316aad5 | 2444 | |
ea88ca2a MD |
2445 | if (chan->switch_timer_enabled == 1) { |
2446 | consumer_timer_switch_stop(chan); | |
2447 | } | |
4628484a MD |
2448 | for (i = 0; i < chan->nr_stream_fds; i++) { |
2449 | int ret; | |
2450 | ||
2451 | ret = close(chan->stream_fds[i]); | |
2452 | if (ret) { | |
2453 | PERROR("close"); | |
2454 | } | |
2455 | if (chan->shm_path[0]) { | |
2456 | char shm_path[PATH_MAX]; | |
2457 | ||
2458 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); | |
2459 | if (ret) { | |
2460 | ERR("Cannot get stream shm path"); | |
2461 | } | |
d2956687 | 2462 | ret = run_as_unlink(shm_path, |
ff588497 JR |
2463 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2464 | chan->buffer_credentials)), | |
2465 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2466 | chan->buffer_credentials))); | |
4628484a | 2467 | if (ret) { |
4628484a MD |
2468 | PERROR("unlink %s", shm_path); |
2469 | } | |
2470 | } | |
2471 | } | |
3bd1e081 MD |
2472 | } |
2473 | ||
b83e03c4 MD |
2474 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
2475 | { | |
2476 | assert(chan); | |
2477 | assert(chan->uchan); | |
d2956687 | 2478 | assert(chan->buffer_credentials.is_set); |
b83e03c4 MD |
2479 | |
2480 | consumer_metadata_cache_destroy(chan); | |
2481 | ustctl_destroy_channel(chan->uchan); | |
ea853771 JR |
2482 | /* Try to rmdir all directories under shm_path root. */ |
2483 | if (chan->root_shm_path[0]) { | |
602766ec | 2484 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
ff588497 JR |
2485 | lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR( |
2486 | chan->buffer_credentials)), | |
2487 | lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR( | |
2488 | chan->buffer_credentials)), | |
f75c5439 | 2489 | LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG); |
ea853771 | 2490 | } |
b83e03c4 MD |
2491 | free(chan->stream_fds); |
2492 | } | |
2493 | ||
3bd1e081 MD |
2494 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
2495 | { | |
ffe60014 DG |
2496 | assert(stream); |
2497 | assert(stream->ustream); | |
d41f73b7 | 2498 | |
ea88ca2a MD |
2499 | if (stream->chan->switch_timer_enabled == 1) { |
2500 | consumer_timer_switch_stop(stream->chan); | |
2501 | } | |
ffe60014 DG |
2502 | ustctl_destroy_stream(stream->ustream); |
2503 | } | |
d41f73b7 | 2504 | |
6d574024 DG |
2505 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
2506 | { | |
2507 | assert(stream); | |
2508 | assert(stream->ustream); | |
2509 | ||
2510 | return ustctl_stream_get_wakeup_fd(stream->ustream); | |
2511 | } | |
2512 | ||
2513 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) | |
2514 | { | |
2515 | assert(stream); | |
2516 | assert(stream->ustream); | |
2517 | ||
2518 | return ustctl_stream_close_wakeup_fd(stream->ustream); | |
2519 | } | |
2520 | ||
94d49140 JD |
2521 | /* |
2522 | * Write up to one packet from the metadata cache to the channel. | |
2523 | * | |
577eea73 JG |
2524 | * Returns the number of bytes pushed from the cache into the ring buffer, or a |
2525 | * negative value on error. | |
94d49140 JD |
2526 | */ |
2527 | static | |
2528 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
2529 | { | |
2530 | ssize_t write_len; | |
2531 | int ret; | |
2532 | ||
2533 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2534 | if (stream->chan->metadata_cache->contents.size == |
2535 | stream->ust_metadata_pushed) { | |
55954e07 JG |
2536 | /* |
2537 | * In the context of a user space metadata channel, a | |
2538 | * change in version can be detected in two ways: | |
2539 | * 1) During the pre-consume of the `read_subbuffer` loop, | |
2540 | * 2) When populating the metadata ring buffer (i.e. here). | |
2541 | * | |
2542 | * This function is invoked when there is no metadata | |
2543 | * available in the ring-buffer. If all data was consumed | |
2544 | * up to the size of the metadata cache, there is no metadata | |
2545 | * to insert in the ring-buffer. | |
2546 | * | |
2547 | * However, the metadata version could still have changed (a | |
2548 | * regeneration without any new data will yield the same cache | |
2549 | * size). | |
2550 | * | |
2551 | * The cache's version is checked for a version change and the | |
2552 | * consumed position is reset if one occurred. | |
2553 | * | |
2554 | * This check is only necessary for the user space domain as | |
2555 | * it has to manage the cache explicitly. If this reset was not | |
2556 | * performed, no metadata would be consumed (and no reset would | |
2557 | * occur as part of the pre-consume) until the metadata size | |
2558 | * exceeded the cache size. | |
2559 | */ | |
2560 | if (stream->metadata_version != | |
2561 | stream->chan->metadata_cache->version) { | |
2562 | metadata_stream_reset_cache_consumed_position(stream); | |
2563 | consumer_stream_metadata_set_version(stream, | |
2564 | stream->chan->metadata_cache->version); | |
2565 | } else { | |
2566 | ret = 0; | |
2567 | goto end; | |
2568 | } | |
94d49140 JD |
2569 | } |
2570 | ||
2571 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
9eac9828 JG |
2572 | &stream->chan->metadata_cache->contents.data[stream->ust_metadata_pushed], |
2573 | stream->chan->metadata_cache->contents.size - | |
2574 | stream->ust_metadata_pushed); | |
94d49140 JD |
2575 | assert(write_len != 0); |
2576 | if (write_len < 0) { | |
2577 | ERR("Writing one metadata packet"); | |
f5ba75b4 | 2578 | ret = write_len; |
94d49140 JD |
2579 | goto end; |
2580 | } | |
2581 | stream->ust_metadata_pushed += write_len; | |
2582 | ||
9eac9828 | 2583 | assert(stream->chan->metadata_cache->contents.size >= |
94d49140 JD |
2584 | stream->ust_metadata_pushed); |
2585 | ret = write_len; | |
2586 | ||
0d88e046 JG |
2587 | /* |
2588 | * Switch packet (but don't open the next one) on every commit of | |
2589 | * a metadata packet. Since the subbuffer is fully filled (with padding, | |
2590 | * if needed), the stream is "quiescent" after this commit. | |
2591 | */ | |
2592 | ustctl_flush_buffer(stream->ustream, 1); | |
2593 | stream->quiescent = true; | |
94d49140 JD |
2594 | end: |
2595 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
2596 | return ret; | |
2597 | } | |
2598 | ||
309167d2 | 2599 | |
94d49140 JD |
2600 | /* |
2601 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
2602 | * metadata thread can consumer them. | |
2603 | * | |
c585821b MD |
2604 | * Metadata stream lock is held here, but we need to release it when |
2605 | * interacting with sessiond, else we cause a deadlock with live | |
2606 | * awaiting on metadata to be pushed out. | |
94d49140 | 2607 | * |
cdb72e4e | 2608 | * The RCU read side lock must be held by the caller. |
94d49140 | 2609 | */ |
577eea73 JG |
2610 | enum sync_metadata_status lttng_ustconsumer_sync_metadata( |
2611 | struct lttng_consumer_local_data *ctx, | |
cdb72e4e | 2612 | struct lttng_consumer_stream *metadata_stream) |
94d49140 JD |
2613 | { |
2614 | int ret; | |
577eea73 | 2615 | enum sync_metadata_status status; |
cdb72e4e | 2616 | struct lttng_consumer_channel *metadata_channel; |
94d49140 JD |
2617 | |
2618 | assert(ctx); | |
cdb72e4e | 2619 | assert(metadata_stream); |
94d49140 | 2620 | |
cdb72e4e JG |
2621 | metadata_channel = metadata_stream->chan; |
2622 | pthread_mutex_unlock(&metadata_stream->lock); | |
94d49140 JD |
2623 | /* |
2624 | * Request metadata from the sessiond, but don't wait for the flush | |
2625 | * because we locked the metadata thread. | |
2626 | */ | |
cdb72e4e JG |
2627 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 0); |
2628 | pthread_mutex_lock(&metadata_stream->lock); | |
94d49140 | 2629 | if (ret < 0) { |
577eea73 | 2630 | status = SYNC_METADATA_STATUS_ERROR; |
94d49140 JD |
2631 | goto end; |
2632 | } | |
2633 | ||
cdb72e4e JG |
2634 | /* |
2635 | * The metadata stream and channel can be deleted while the | |
2636 | * metadata stream lock was released. The streamed is checked | |
2637 | * for deletion before we use it further. | |
2638 | * | |
2639 | * Note that it is safe to access a logically-deleted stream since its | |
2640 | * existence is still guaranteed by the RCU read side lock. However, | |
2641 | * it should no longer be used. The close/deletion of the metadata | |
2642 | * channel and stream already guarantees that all metadata has been | |
2643 | * consumed. Therefore, there is nothing left to do in this function. | |
2644 | */ | |
2645 | if (consumer_stream_is_deleted(metadata_stream)) { | |
2646 | DBG("Metadata stream %" PRIu64 " was deleted during the metadata synchronization", | |
2647 | metadata_stream->key); | |
577eea73 | 2648 | status = SYNC_METADATA_STATUS_NO_DATA; |
cdb72e4e JG |
2649 | goto end; |
2650 | } | |
2651 | ||
2652 | ret = commit_one_metadata_packet(metadata_stream); | |
577eea73 JG |
2653 | if (ret < 0) { |
2654 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2655 | goto end; |
2656 | } else if (ret > 0) { | |
577eea73 JG |
2657 | status = SYNC_METADATA_STATUS_NEW_DATA; |
2658 | } else /* ret == 0 */ { | |
2659 | status = SYNC_METADATA_STATUS_NO_DATA; | |
2660 | goto end; | |
94d49140 JD |
2661 | } |
2662 | ||
cdb72e4e | 2663 | ret = ustctl_snapshot(metadata_stream->ustream); |
94d49140 | 2664 | if (ret < 0) { |
577eea73 JG |
2665 | ERR("Failed to take a snapshot of the metadata ring-buffer positions, ret = %d", ret); |
2666 | status = SYNC_METADATA_STATUS_ERROR; | |
94d49140 JD |
2667 | goto end; |
2668 | } | |
2669 | ||
94d49140 | 2670 | end: |
577eea73 | 2671 | return status; |
94d49140 JD |
2672 | } |
2673 | ||
02b3d176 DG |
2674 | /* |
2675 | * Return 0 on success else a negative value. | |
2676 | */ | |
2677 | static int notify_if_more_data(struct lttng_consumer_stream *stream, | |
2678 | struct lttng_consumer_local_data *ctx) | |
2679 | { | |
2680 | int ret; | |
2681 | struct ustctl_consumer_stream *ustream; | |
2682 | ||
2683 | assert(stream); | |
2684 | assert(ctx); | |
2685 | ||
2686 | ustream = stream->ustream; | |
2687 | ||
2688 | /* | |
2689 | * First, we are going to check if there is a new subbuffer available | |
2690 | * before reading the stream wait_fd. | |
2691 | */ | |
2692 | /* Get the next subbuffer */ | |
2693 | ret = ustctl_get_next_subbuf(ustream); | |
2694 | if (ret) { | |
2695 | /* No more data found, flag the stream. */ | |
2696 | stream->has_data = 0; | |
2697 | ret = 0; | |
2698 | goto end; | |
2699 | } | |
2700 | ||
5420e5db | 2701 | ret = ustctl_put_subbuf(ustream); |
02b3d176 DG |
2702 | assert(!ret); |
2703 | ||
2704 | /* This stream still has data. Flag it and wake up the data thread. */ | |
2705 | stream->has_data = 1; | |
2706 | ||
2707 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { | |
2708 | ssize_t writelen; | |
2709 | ||
2710 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); | |
2711 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2712 | ret = writelen; | |
2713 | goto end; | |
2714 | } | |
2715 | ||
2716 | /* The wake up pipe has been notified. */ | |
2717 | ctx->has_wakeup = 1; | |
2718 | } | |
2719 | ret = 0; | |
2720 | ||
2721 | end: | |
2722 | return ret; | |
2723 | } | |
2724 | ||
6f9449c2 | 2725 | static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream *stream) |
fb83fe64 | 2726 | { |
6f9449c2 | 2727 | int ret = 0; |
fb83fe64 | 2728 | |
fb83fe64 | 2729 | /* |
6f9449c2 JG |
2730 | * We can consume the 1 byte written into the wait_fd by |
2731 | * UST. Don't trigger error if we cannot read this one byte | |
2732 | * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
2733 | * | |
2734 | * This is only done when the stream is monitored by a thread, | |
2735 | * before the flush is done after a hangup and if the stream | |
2736 | * is not flagged with data since there might be nothing to | |
2737 | * consume in the wait fd but still have data available | |
2738 | * flagged by the consumer wake up pipe. | |
fb83fe64 | 2739 | */ |
6f9449c2 JG |
2740 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
2741 | char dummy; | |
2742 | ssize_t readlen; | |
2743 | ||
2744 | readlen = lttng_read(stream->wait_fd, &dummy, 1); | |
2745 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
2746 | ret = readlen; | |
2747 | } | |
fb83fe64 | 2748 | } |
fb83fe64 | 2749 | |
6f9449c2 JG |
2750 | return ret; |
2751 | } | |
2752 | ||
2753 | static int extract_common_subbuffer_info(struct lttng_consumer_stream *stream, | |
2754 | struct stream_subbuffer *subbuf) | |
2755 | { | |
2756 | int ret; | |
2757 | ||
2758 | ret = ustctl_get_subbuf_size( | |
2759 | stream->ustream, &subbuf->info.data.subbuf_size); | |
2760 | if (ret) { | |
fb83fe64 JD |
2761 | goto end; |
2762 | } | |
6f9449c2 JG |
2763 | |
2764 | ret = ustctl_get_padded_subbuf_size( | |
2765 | stream->ustream, &subbuf->info.data.padded_subbuf_size); | |
2766 | if (ret) { | |
2767 | goto end; | |
fb83fe64 | 2768 | } |
fb83fe64 JD |
2769 | |
2770 | end: | |
2771 | return ret; | |
2772 | } | |
2773 | ||
6f9449c2 JG |
2774 | static int extract_metadata_subbuffer_info(struct lttng_consumer_stream *stream, |
2775 | struct stream_subbuffer *subbuf) | |
d41f73b7 | 2776 | { |
6f9449c2 | 2777 | int ret; |
ffe60014 | 2778 | |
6f9449c2 JG |
2779 | ret = extract_common_subbuffer_info(stream, subbuf); |
2780 | if (ret) { | |
2781 | goto end; | |
2782 | } | |
d41f73b7 | 2783 | |
55954e07 | 2784 | subbuf->info.metadata.version = stream->metadata_version; |
ffe60014 | 2785 | |
6f9449c2 JG |
2786 | end: |
2787 | return ret; | |
2788 | } | |
d41f73b7 | 2789 | |
6f9449c2 JG |
2790 | static int extract_data_subbuffer_info(struct lttng_consumer_stream *stream, |
2791 | struct stream_subbuffer *subbuf) | |
2792 | { | |
2793 | int ret; | |
c617c0c6 | 2794 | |
6f9449c2 JG |
2795 | ret = extract_common_subbuffer_info(stream, subbuf); |
2796 | if (ret) { | |
2797 | goto end; | |
02d02e31 JD |
2798 | } |
2799 | ||
6f9449c2 JG |
2800 | ret = ustctl_get_packet_size( |
2801 | stream->ustream, &subbuf->info.data.packet_size); | |
2802 | if (ret < 0) { | |
2803 | PERROR("Failed to get sub-buffer packet size"); | |
2804 | goto end; | |
2805 | } | |
04ef1097 | 2806 | |
6f9449c2 JG |
2807 | ret = ustctl_get_content_size( |
2808 | stream->ustream, &subbuf->info.data.content_size); | |
2809 | if (ret < 0) { | |
2810 | PERROR("Failed to get sub-buffer content size"); | |
2811 | goto end; | |
d41f73b7 | 2812 | } |
309167d2 | 2813 | |
6f9449c2 JG |
2814 | ret = ustctl_get_timestamp_begin( |
2815 | stream->ustream, &subbuf->info.data.timestamp_begin); | |
2816 | if (ret < 0) { | |
2817 | PERROR("Failed to get sub-buffer begin timestamp"); | |
2818 | goto end; | |
2819 | } | |
fb83fe64 | 2820 | |
6f9449c2 JG |
2821 | ret = ustctl_get_timestamp_end( |
2822 | stream->ustream, &subbuf->info.data.timestamp_end); | |
2823 | if (ret < 0) { | |
2824 | PERROR("Failed to get sub-buffer end timestamp"); | |
2825 | goto end; | |
2826 | } | |
2827 | ||
2828 | ret = ustctl_get_events_discarded( | |
2829 | stream->ustream, &subbuf->info.data.events_discarded); | |
2830 | if (ret) { | |
2831 | PERROR("Failed to get sub-buffer events discarded count"); | |
2832 | goto end; | |
2833 | } | |
2834 | ||
2835 | ret = ustctl_get_sequence_number(stream->ustream, | |
2836 | &subbuf->info.data.sequence_number.value); | |
2837 | if (ret) { | |
2838 | /* May not be supported by older LTTng-modules. */ | |
2839 | if (ret != -ENOTTY) { | |
2840 | PERROR("Failed to get sub-buffer sequence number"); | |
2841 | goto end; | |
fb83fe64 | 2842 | } |
1c20f0e2 | 2843 | } else { |
6f9449c2 | 2844 | subbuf->info.data.sequence_number.is_set = true; |
309167d2 JD |
2845 | } |
2846 | ||
6f9449c2 JG |
2847 | ret = ustctl_get_stream_id( |
2848 | stream->ustream, &subbuf->info.data.stream_id); | |
2849 | if (ret < 0) { | |
2850 | PERROR("Failed to get stream id"); | |
2851 | goto end; | |
2852 | } | |
1d4dfdef | 2853 | |
6f9449c2 JG |
2854 | ret = ustctl_get_instance_id(stream->ustream, |
2855 | &subbuf->info.data.stream_instance_id.value); | |
2856 | if (ret) { | |
2857 | /* May not be supported by older LTTng-modules. */ | |
2858 | if (ret != -ENOTTY) { | |
2859 | PERROR("Failed to get stream instance id"); | |
2860 | goto end; | |
2861 | } | |
2862 | } else { | |
2863 | subbuf->info.data.stream_instance_id.is_set = true; | |
2864 | } | |
2865 | end: | |
2866 | return ret; | |
2867 | } | |
1d4dfdef | 2868 | |
6f9449c2 JG |
2869 | static int get_next_subbuffer_common(struct lttng_consumer_stream *stream, |
2870 | struct stream_subbuffer *subbuffer) | |
2871 | { | |
2872 | int ret; | |
2873 | const char *addr; | |
1d4dfdef | 2874 | |
6f9449c2 JG |
2875 | ret = stream->read_subbuffer_ops.extract_subbuffer_info( |
2876 | stream, subbuffer); | |
2877 | if (ret) { | |
2878 | goto end; | |
2879 | } | |
02d02e31 | 2880 | |
6f9449c2 | 2881 | ret = get_current_subbuf_addr(stream, &addr); |
128708c3 | 2882 | if (ret) { |
6f9449c2 | 2883 | goto end; |
128708c3 JG |
2884 | } |
2885 | ||
6f9449c2 JG |
2886 | subbuffer->buffer.buffer = lttng_buffer_view_init( |
2887 | addr, 0, subbuffer->info.data.padded_subbuf_size); | |
2888 | assert(subbuffer->buffer.buffer.data != NULL); | |
2889 | end: | |
2890 | return ret; | |
2891 | } | |
fd424d99 | 2892 | |
6f9449c2 JG |
2893 | static int get_next_subbuffer(struct lttng_consumer_stream *stream, |
2894 | struct stream_subbuffer *subbuffer) | |
2895 | { | |
2896 | int ret; | |
331744e3 | 2897 | |
6f9449c2 JG |
2898 | ret = ustctl_get_next_subbuf(stream->ustream); |
2899 | if (ret) { | |
2900 | goto end; | |
02b3d176 DG |
2901 | } |
2902 | ||
6f9449c2 JG |
2903 | ret = get_next_subbuffer_common(stream, subbuffer); |
2904 | if (ret) { | |
23d56598 | 2905 | goto end; |
1c20f0e2 | 2906 | } |
6f9449c2 JG |
2907 | end: |
2908 | return ret; | |
2909 | } | |
1c20f0e2 | 2910 | |
6f9449c2 JG |
2911 | static int get_next_subbuffer_metadata(struct lttng_consumer_stream *stream, |
2912 | struct stream_subbuffer *subbuffer) | |
2913 | { | |
2914 | int ret; | |
f5ba75b4 JG |
2915 | bool cache_empty; |
2916 | bool got_subbuffer; | |
2917 | bool coherent; | |
2918 | bool buffer_empty; | |
2919 | unsigned long consumed_pos, produced_pos; | |
6f9449c2 | 2920 | |
f5ba75b4 JG |
2921 | do { |
2922 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2923 | if (ret == 0) { | |
2924 | got_subbuffer = true; | |
2925 | } else { | |
2926 | got_subbuffer = false; | |
2927 | if (ret != -EAGAIN) { | |
2928 | /* Fatal error. */ | |
2929 | goto end; | |
2930 | } | |
c585821b MD |
2931 | } |
2932 | ||
f5ba75b4 JG |
2933 | /* |
2934 | * Determine if the cache is empty and ensure that a sub-buffer | |
2935 | * is made available if the cache is not empty. | |
2936 | */ | |
2937 | if (!got_subbuffer) { | |
2938 | ret = commit_one_metadata_packet(stream); | |
2939 | if (ret < 0 && ret != -ENOBUFS) { | |
2940 | goto end; | |
2941 | } else if (ret == 0) { | |
2942 | /* Not an error, the cache is empty. */ | |
2943 | cache_empty = true; | |
2944 | ret = -ENODATA; | |
2945 | goto end; | |
2946 | } else { | |
2947 | cache_empty = false; | |
2948 | } | |
2949 | } else { | |
2950 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
9eac9828 JG |
2951 | cache_empty = stream->chan->metadata_cache->contents.size == |
2952 | stream->ust_metadata_pushed; | |
f5ba75b4 | 2953 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
94d49140 | 2954 | } |
f5ba75b4 | 2955 | } while (!got_subbuffer); |
94d49140 | 2956 | |
f5ba75b4 | 2957 | /* Populate sub-buffer infos and view. */ |
6f9449c2 JG |
2958 | ret = get_next_subbuffer_common(stream, subbuffer); |
2959 | if (ret) { | |
2960 | goto end; | |
309167d2 | 2961 | } |
f5ba75b4 JG |
2962 | |
2963 | ret = lttng_ustconsumer_sample_snapshot_positions(stream); | |
2964 | if (ret < 0) { | |
2965 | /* | |
2966 | * -EAGAIN is not expected since we got a sub-buffer and haven't | |
2967 | * pushed the consumption position yet (on put_next). | |
2968 | */ | |
2969 | PERROR("Failed to take a snapshot of metadata buffer positions"); | |
2970 | goto end; | |
2971 | } | |
2972 | ||
2973 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
2974 | if (ret) { | |
2975 | PERROR("Failed to get metadata consumed position"); | |
2976 | goto end; | |
2977 | } | |
2978 | ||
2979 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
2980 | if (ret) { | |
2981 | PERROR("Failed to get metadata produced position"); | |
2982 | goto end; | |
2983 | } | |
2984 | ||
2985 | /* Last sub-buffer of the ring buffer ? */ | |
2986 | buffer_empty = (consumed_pos + stream->max_sb_size) == produced_pos; | |
2987 | ||
2988 | /* | |
2989 | * The sessiond registry lock ensures that coherent units of metadata | |
2990 | * are pushed to the consumer daemon at once. Hence, if a sub-buffer is | |
2991 | * acquired, the cache is empty, and it is the only available sub-buffer | |
2992 | * available, it is safe to assume that it is "coherent". | |
2993 | */ | |
2994 | coherent = got_subbuffer && cache_empty && buffer_empty; | |
2995 | ||
2996 | LTTNG_OPTIONAL_SET(&subbuffer->info.metadata.coherent, coherent); | |
23d56598 | 2997 | end: |
d41f73b7 MD |
2998 | return ret; |
2999 | } | |
3000 | ||
6f9449c2 JG |
3001 | static int put_next_subbuffer(struct lttng_consumer_stream *stream, |
3002 | struct stream_subbuffer *subbuffer) | |
3003 | { | |
3004 | const int ret = ustctl_put_next_subbuf(stream->ustream); | |
3005 | ||
3006 | assert(ret == 0); | |
3007 | return ret; | |
3008 | } | |
3009 | ||
3010 | static int signal_metadata(struct lttng_consumer_stream *stream, | |
3011 | struct lttng_consumer_local_data *ctx) | |
3012 | { | |
8db3acaf | 3013 | ASSERT_LOCKED(stream->metadata_rdv_lock); |
6f9449c2 JG |
3014 | return pthread_cond_broadcast(&stream->metadata_rdv) ? -errno : 0; |
3015 | } | |
3016 | ||
f5ba75b4 | 3017 | static int lttng_ustconsumer_set_stream_ops( |
6f9449c2 JG |
3018 | struct lttng_consumer_stream *stream) |
3019 | { | |
f5ba75b4 JG |
3020 | int ret = 0; |
3021 | ||
6f9449c2 JG |
3022 | stream->read_subbuffer_ops.on_wake_up = consumer_stream_ust_on_wake_up; |
3023 | if (stream->metadata_flag) { | |
3024 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3025 | get_next_subbuffer_metadata; | |
3026 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3027 | extract_metadata_subbuffer_info; | |
3028 | stream->read_subbuffer_ops.reset_metadata = | |
55954e07 | 3029 | metadata_stream_reset_cache_consumed_position; |
f5ba75b4 JG |
3030 | if (stream->chan->is_live) { |
3031 | stream->read_subbuffer_ops.on_sleep = signal_metadata; | |
3032 | ret = consumer_stream_enable_metadata_bucketization( | |
3033 | stream); | |
3034 | if (ret) { | |
3035 | goto end; | |
3036 | } | |
3037 | } | |
6f9449c2 JG |
3038 | } else { |
3039 | stream->read_subbuffer_ops.get_next_subbuffer = | |
3040 | get_next_subbuffer; | |
3041 | stream->read_subbuffer_ops.extract_subbuffer_info = | |
3042 | extract_data_subbuffer_info; | |
3043 | stream->read_subbuffer_ops.on_sleep = notify_if_more_data; | |
3044 | if (stream->chan->is_live) { | |
3045 | stream->read_subbuffer_ops.send_live_beacon = | |
3046 | consumer_flush_ust_index; | |
3047 | } | |
3048 | } | |
3049 | ||
3050 | stream->read_subbuffer_ops.put_next_subbuffer = put_next_subbuffer; | |
f5ba75b4 JG |
3051 | end: |
3052 | return ret; | |
6f9449c2 JG |
3053 | } |
3054 | ||
ffe60014 DG |
3055 | /* |
3056 | * Called when a stream is created. | |
fe4477ee JD |
3057 | * |
3058 | * Return 0 on success or else a negative value. | |
ffe60014 | 3059 | */ |
d41f73b7 MD |
3060 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
3061 | { | |
fe4477ee JD |
3062 | int ret; |
3063 | ||
10a50311 JD |
3064 | assert(stream); |
3065 | ||
d2956687 JG |
3066 | /* |
3067 | * Don't create anything if this is set for streaming or if there is | |
3068 | * no current trace chunk on the parent channel. | |
3069 | */ | |
3070 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor && | |
3071 | stream->chan->trace_chunk) { | |
3072 | ret = consumer_stream_create_output_files(stream, true); | |
3073 | if (ret) { | |
fe4477ee JD |
3074 | goto error; |
3075 | } | |
fe4477ee | 3076 | } |
6f9449c2 JG |
3077 | |
3078 | lttng_ustconsumer_set_stream_ops(stream); | |
fe4477ee JD |
3079 | ret = 0; |
3080 | ||
3081 | error: | |
3082 | return ret; | |
d41f73b7 | 3083 | } |
ca22feea DG |
3084 | |
3085 | /* | |
3086 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
3087 | * stream. Consumer data lock MUST be acquired before calling this function |
3088 | * and the stream lock. | |
ca22feea | 3089 | * |
6d805429 | 3090 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
3091 | * data is available for trace viewer reading. |
3092 | */ | |
6d805429 | 3093 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
3094 | { |
3095 | int ret; | |
3096 | ||
3097 | assert(stream); | |
ffe60014 | 3098 | assert(stream->ustream); |
b1316da1 | 3099 | ASSERT_LOCKED(stream->lock); |
ca22feea | 3100 | |
6d805429 | 3101 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 3102 | |
ca6b395f MD |
3103 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
3104 | ret = 0; | |
3105 | goto end; | |
3106 | } | |
3107 | ||
04ef1097 | 3108 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
3109 | uint64_t contiguous, pushed; |
3110 | ||
3111 | /* Ease our life a bit. */ | |
934ba8fd | 3112 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); |
9eac9828 | 3113 | contiguous = stream->chan->metadata_cache->contents.size; |
934ba8fd | 3114 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
e6ee4eab DG |
3115 | pushed = stream->ust_metadata_pushed; |
3116 | ||
04ef1097 MD |
3117 | /* |
3118 | * We can simply check whether all contiguously available data | |
3119 | * has been pushed to the ring buffer, since the push operation | |
3120 | * is performed within get_next_subbuf(), and because both | |
3121 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
3122 | * thanks to the stream lock within | |
3123 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
3124 | * whetnever ust_metadata_pushed is incremented, the associated | |
3125 | * metadata has been consumed from the metadata stream. | |
3126 | */ | |
3127 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 3128 | contiguous, pushed); |
aa01b94c | 3129 | assert(((int64_t) (contiguous - pushed)) >= 0); |
e6ee4eab | 3130 | if ((contiguous != pushed) || |
6acdf328 | 3131 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
3132 | ret = 1; /* Data is pending */ |
3133 | goto end; | |
3134 | } | |
3135 | } else { | |
3136 | ret = ustctl_get_next_subbuf(stream->ustream); | |
3137 | if (ret == 0) { | |
3138 | /* | |
3139 | * There is still data so let's put back this | |
3140 | * subbuffer. | |
3141 | */ | |
3142 | ret = ustctl_put_subbuf(stream->ustream); | |
3143 | assert(ret == 0); | |
3144 | ret = 1; /* Data is pending */ | |
3145 | goto end; | |
3146 | } | |
ca22feea DG |
3147 | } |
3148 | ||
6d805429 DG |
3149 | /* Data is NOT pending so ready to be read. */ |
3150 | ret = 0; | |
ca22feea | 3151 | |
6efae65e DG |
3152 | end: |
3153 | return ret; | |
ca22feea | 3154 | } |
d88aee68 | 3155 | |
6d574024 DG |
3156 | /* |
3157 | * Stop a given metadata channel timer if enabled and close the wait fd which | |
3158 | * is the poll pipe of the metadata stream. | |
3159 | * | |
d2c82a5a | 3160 | * This MUST be called with the metadata channel lock acquired. |
6d574024 DG |
3161 | */ |
3162 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) | |
3163 | { | |
3164 | int ret; | |
3165 | ||
3166 | assert(metadata); | |
3167 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
3168 | ||
3169 | DBG("Closing metadata channel key %" PRIu64, metadata->key); | |
3170 | ||
3171 | if (metadata->switch_timer_enabled == 1) { | |
3172 | consumer_timer_switch_stop(metadata); | |
3173 | } | |
3174 | ||
3175 | if (!metadata->metadata_stream) { | |
3176 | goto end; | |
3177 | } | |
3178 | ||
3179 | /* | |
3180 | * Closing write side so the thread monitoring the stream wakes up if any | |
3181 | * and clean the metadata stream. | |
3182 | */ | |
3183 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { | |
3184 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); | |
3185 | if (ret < 0) { | |
3186 | PERROR("closing metadata pipe write side"); | |
3187 | } | |
3188 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; | |
3189 | } | |
3190 | ||
3191 | end: | |
3192 | return; | |
3193 | } | |
3194 | ||
d88aee68 DG |
3195 | /* |
3196 | * Close every metadata stream wait fd of the metadata hash table. This | |
3197 | * function MUST be used very carefully so not to run into a race between the | |
3198 | * metadata thread handling streams and this function closing their wait fd. | |
3199 | * | |
3200 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
3201 | * producer so calling this is safe because we are assured that no state change | |
3202 | * can occur in the metadata thread for the streams in the hash table. | |
3203 | */ | |
6d574024 | 3204 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
d88aee68 | 3205 | { |
d88aee68 DG |
3206 | struct lttng_ht_iter iter; |
3207 | struct lttng_consumer_stream *stream; | |
3208 | ||
3209 | assert(metadata_ht); | |
3210 | assert(metadata_ht->ht); | |
3211 | ||
3212 | DBG("UST consumer closing all metadata streams"); | |
3213 | ||
3214 | rcu_read_lock(); | |
3215 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
3216 | node.node) { | |
9ce5646a MD |
3217 | |
3218 | health_code_update(); | |
3219 | ||
be2b50c7 | 3220 | pthread_mutex_lock(&stream->chan->lock); |
6d574024 | 3221 | lttng_ustconsumer_close_metadata(stream->chan); |
be2b50c7 DG |
3222 | pthread_mutex_unlock(&stream->chan->lock); |
3223 | ||
d88aee68 DG |
3224 | } |
3225 | rcu_read_unlock(); | |
3226 | } | |
d8ef542d MD |
3227 | |
3228 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
3229 | { | |
3230 | int ret; | |
3231 | ||
3232 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
3233 | if (ret < 0) { | |
3234 | ERR("Unable to close wakeup fd"); | |
3235 | } | |
3236 | } | |
331744e3 | 3237 | |
f666ae70 MD |
3238 | /* |
3239 | * Please refer to consumer-timer.c before adding any lock within this | |
3240 | * function or any of its callees. Timers have a very strict locking | |
3241 | * semantic with respect to teardown. Failure to respect this semantic | |
3242 | * introduces deadlocks. | |
c585821b MD |
3243 | * |
3244 | * DON'T hold the metadata lock when calling this function, else this | |
3245 | * can cause deadlock involving consumer awaiting for metadata to be | |
3246 | * pushed out due to concurrent interaction with the session daemon. | |
f666ae70 | 3247 | */ |
331744e3 | 3248 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 3249 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
3250 | { |
3251 | struct lttcomm_metadata_request_msg request; | |
3252 | struct lttcomm_consumer_msg msg; | |
0c759fc9 | 3253 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
93ec662e | 3254 | uint64_t len, key, offset, version; |
331744e3 JD |
3255 | int ret; |
3256 | ||
3257 | assert(channel); | |
3258 | assert(channel->metadata_cache); | |
3259 | ||
53efb85a MD |
3260 | memset(&request, 0, sizeof(request)); |
3261 | ||
331744e3 | 3262 | /* send the metadata request to sessiond */ |
fa29bfbf | 3263 | switch (the_consumer_data.type) { |
331744e3 JD |
3264 | case LTTNG_CONSUMER64_UST: |
3265 | request.bits_per_long = 64; | |
3266 | break; | |
3267 | case LTTNG_CONSUMER32_UST: | |
3268 | request.bits_per_long = 32; | |
3269 | break; | |
3270 | default: | |
3271 | request.bits_per_long = 0; | |
3272 | break; | |
3273 | } | |
3274 | ||
3275 | request.session_id = channel->session_id; | |
1950109e | 3276 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
3277 | /* |
3278 | * Request the application UID here so the metadata of that application can | |
3279 | * be sent back. The channel UID corresponds to the user UID of the session | |
3280 | * used for the rights on the stream file(s). | |
3281 | */ | |
3282 | request.uid = channel->ust_app_uid; | |
331744e3 | 3283 | request.key = channel->key; |
567eb353 | 3284 | |
1950109e | 3285 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
3e25d926 | 3286 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
567eb353 DG |
3287 | request.session_id, request.session_id_per_pid, request.uid, |
3288 | request.key); | |
331744e3 | 3289 | |
75d83e50 | 3290 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
3291 | |
3292 | health_code_update(); | |
3293 | ||
331744e3 JD |
3294 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
3295 | sizeof(request)); | |
3296 | if (ret < 0) { | |
3297 | ERR("Asking metadata to sessiond"); | |
3298 | goto end; | |
3299 | } | |
3300 | ||
9ce5646a MD |
3301 | health_code_update(); |
3302 | ||
331744e3 JD |
3303 | /* Receive the metadata from sessiond */ |
3304 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
3305 | sizeof(msg)); | |
3306 | if (ret != sizeof(msg)) { | |
8fd623e0 | 3307 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
3308 | ret, sizeof(msg)); |
3309 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
3310 | /* | |
3311 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
3312 | * since the caller handles this. | |
3313 | */ | |
3314 | goto end; | |
3315 | } | |
3316 | ||
9ce5646a MD |
3317 | health_code_update(); |
3318 | ||
331744e3 JD |
3319 | if (msg.cmd_type == LTTNG_ERR_UND) { |
3320 | /* No registry found */ | |
3321 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
3322 | ret_code); | |
3323 | ret = 0; | |
3324 | goto end; | |
3325 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
3326 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
3327 | ret = -1; | |
3328 | goto end; | |
3329 | } | |
3330 | ||
3331 | len = msg.u.push_metadata.len; | |
3332 | key = msg.u.push_metadata.key; | |
3333 | offset = msg.u.push_metadata.target_offset; | |
93ec662e | 3334 | version = msg.u.push_metadata.version; |
331744e3 JD |
3335 | |
3336 | assert(key == channel->key); | |
3337 | if (len == 0) { | |
3338 | DBG("No new metadata to receive for key %" PRIu64, key); | |
3339 | } | |
3340 | ||
9ce5646a MD |
3341 | health_code_update(); |
3342 | ||
331744e3 JD |
3343 | /* Tell session daemon we are ready to receive the metadata. */ |
3344 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
0c759fc9 | 3345 | LTTCOMM_CONSUMERD_SUCCESS); |
331744e3 JD |
3346 | if (ret < 0 || len == 0) { |
3347 | /* | |
3348 | * Somehow, the session daemon is not responding anymore or there is | |
3349 | * nothing to receive. | |
3350 | */ | |
3351 | goto end; | |
3352 | } | |
3353 | ||
9ce5646a MD |
3354 | health_code_update(); |
3355 | ||
1eb682be | 3356 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
93ec662e | 3357 | key, offset, len, version, channel, timer, wait); |
1eb682be | 3358 | if (ret >= 0) { |
f2a444f1 DG |
3359 | /* |
3360 | * Only send the status msg if the sessiond is alive meaning a positive | |
3361 | * ret code. | |
3362 | */ | |
1eb682be | 3363 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
f2a444f1 | 3364 | } |
331744e3 JD |
3365 | ret = 0; |
3366 | ||
3367 | end: | |
9ce5646a MD |
3368 | health_code_update(); |
3369 | ||
75d83e50 | 3370 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
3371 | return ret; |
3372 | } | |
70190e1c DG |
3373 | |
3374 | /* | |
3375 | * Return the ustctl call for the get stream id. | |
3376 | */ | |
3377 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, | |
3378 | uint64_t *stream_id) | |
3379 | { | |
3380 | assert(stream); | |
3381 | assert(stream_id); | |
3382 | ||
3383 | return ustctl_get_stream_id(stream->ustream, stream_id); | |
3384 | } |