Commit | Line | Data |
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3bd1e081 MD |
1 | /* |
2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
3bd1e081 MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
3bd1e081 MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <assert.h> | |
f02e1e8a | 21 | #include <lttng/ust-ctl.h> |
3bd1e081 MD |
22 | #include <poll.h> |
23 | #include <pthread.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/mman.h> | |
27 | #include <sys/socket.h> | |
dbb5dfe6 | 28 | #include <sys/stat.h> |
3bd1e081 | 29 | #include <sys/types.h> |
77c7c900 | 30 | #include <inttypes.h> |
3bd1e081 | 31 | #include <unistd.h> |
ffe60014 | 32 | #include <urcu/list.h> |
331744e3 | 33 | #include <signal.h> |
0857097f | 34 | |
51a9e1c7 | 35 | #include <bin/lttng-consumerd/health-consumerd.h> |
990570ed | 36 | #include <common/common.h> |
10a8a223 | 37 | #include <common/sessiond-comm/sessiond-comm.h> |
00e2e675 | 38 | #include <common/relayd/relayd.h> |
dbb5dfe6 | 39 | #include <common/compat/fcntl.h> |
331744e3 | 40 | #include <common/consumer-metadata-cache.h> |
10a50311 | 41 | #include <common/consumer-stream.h> |
331744e3 | 42 | #include <common/consumer-timer.h> |
fe4477ee | 43 | #include <common/utils.h> |
309167d2 | 44 | #include <common/index/index.h> |
10a8a223 DG |
45 | |
46 | #include "ust-consumer.h" | |
3bd1e081 MD |
47 | |
48 | extern struct lttng_consumer_global_data consumer_data; | |
49 | extern int consumer_poll_timeout; | |
50 | extern volatile int consumer_quit; | |
51 | ||
52 | /* | |
ffe60014 DG |
53 | * Free channel object and all streams associated with it. This MUST be used |
54 | * only and only if the channel has _NEVER_ been added to the global channel | |
55 | * hash table. | |
3bd1e081 | 56 | */ |
ffe60014 | 57 | static void destroy_channel(struct lttng_consumer_channel *channel) |
3bd1e081 | 58 | { |
ffe60014 DG |
59 | struct lttng_consumer_stream *stream, *stmp; |
60 | ||
61 | assert(channel); | |
62 | ||
63 | DBG("UST consumer cleaning stream list"); | |
64 | ||
65 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
66 | send_node) { | |
9ce5646a MD |
67 | |
68 | health_code_update(); | |
69 | ||
ffe60014 DG |
70 | cds_list_del(&stream->send_node); |
71 | ustctl_destroy_stream(stream->ustream); | |
72 | free(stream); | |
73 | } | |
74 | ||
75 | /* | |
76 | * If a channel is available meaning that was created before the streams | |
77 | * were, delete it. | |
78 | */ | |
79 | if (channel->uchan) { | |
80 | lttng_ustconsumer_del_channel(channel); | |
81 | } | |
82 | free(channel); | |
83 | } | |
3bd1e081 MD |
84 | |
85 | /* | |
ffe60014 | 86 | * Add channel to internal consumer state. |
3bd1e081 | 87 | * |
ffe60014 | 88 | * Returns 0 on success or else a negative value. |
3bd1e081 | 89 | */ |
ffe60014 DG |
90 | static int add_channel(struct lttng_consumer_channel *channel, |
91 | struct lttng_consumer_local_data *ctx) | |
3bd1e081 MD |
92 | { |
93 | int ret = 0; | |
94 | ||
ffe60014 DG |
95 | assert(channel); |
96 | assert(ctx); | |
97 | ||
98 | if (ctx->on_recv_channel != NULL) { | |
99 | ret = ctx->on_recv_channel(channel); | |
100 | if (ret == 0) { | |
d8ef542d | 101 | ret = consumer_add_channel(channel, ctx); |
ffe60014 DG |
102 | } else if (ret < 0) { |
103 | /* Most likely an ENOMEM. */ | |
104 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
105 | goto error; | |
106 | } | |
107 | } else { | |
d8ef542d | 108 | ret = consumer_add_channel(channel, ctx); |
3bd1e081 MD |
109 | } |
110 | ||
d88aee68 | 111 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
ffe60014 DG |
112 | |
113 | error: | |
3bd1e081 MD |
114 | return ret; |
115 | } | |
116 | ||
117 | /* | |
ffe60014 DG |
118 | * Allocate and return a consumer channel object. |
119 | */ | |
120 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, | |
121 | const char *pathname, const char *name, uid_t uid, gid_t gid, | |
da009f2c | 122 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
2bba9e53 | 123 | uint64_t tracefile_size, uint64_t tracefile_count, |
ecc48a90 JD |
124 | uint64_t session_id_per_pid, unsigned int monitor, |
125 | unsigned int live_timer_interval) | |
ffe60014 DG |
126 | { |
127 | assert(pathname); | |
128 | assert(name); | |
129 | ||
1950109e JD |
130 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
131 | gid, relayd_id, output, tracefile_size, | |
ecc48a90 | 132 | tracefile_count, session_id_per_pid, monitor, live_timer_interval); |
ffe60014 DG |
133 | } |
134 | ||
135 | /* | |
136 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the | |
137 | * error value if applicable is set in it else it is kept untouched. | |
3bd1e081 | 138 | * |
ffe60014 | 139 | * Return NULL on error else the newly allocated stream object. |
3bd1e081 | 140 | */ |
ffe60014 DG |
141 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
142 | struct lttng_consumer_channel *channel, | |
143 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) | |
144 | { | |
145 | int alloc_ret; | |
146 | struct lttng_consumer_stream *stream = NULL; | |
147 | ||
148 | assert(channel); | |
149 | assert(ctx); | |
150 | ||
151 | stream = consumer_allocate_stream(channel->key, | |
152 | key, | |
153 | LTTNG_CONSUMER_ACTIVE_STREAM, | |
154 | channel->name, | |
155 | channel->uid, | |
156 | channel->gid, | |
157 | channel->relayd_id, | |
158 | channel->session_id, | |
159 | cpu, | |
160 | &alloc_ret, | |
4891ece8 DG |
161 | channel->type, |
162 | channel->monitor); | |
ffe60014 DG |
163 | if (stream == NULL) { |
164 | switch (alloc_ret) { | |
165 | case -ENOENT: | |
166 | /* | |
167 | * We could not find the channel. Can happen if cpu hotplug | |
168 | * happens while tearing down. | |
169 | */ | |
170 | DBG3("Could not find channel"); | |
171 | break; | |
172 | case -ENOMEM: | |
173 | case -EINVAL: | |
174 | default: | |
175 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); | |
176 | break; | |
177 | } | |
178 | goto error; | |
179 | } | |
180 | ||
181 | stream->chan = channel; | |
182 | ||
183 | error: | |
184 | if (_alloc_ret) { | |
185 | *_alloc_ret = alloc_ret; | |
186 | } | |
187 | return stream; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Send the given stream pointer to the corresponding thread. | |
192 | * | |
193 | * Returns 0 on success else a negative value. | |
194 | */ | |
195 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, | |
196 | struct lttng_consumer_local_data *ctx) | |
197 | { | |
dae10966 DG |
198 | int ret; |
199 | struct lttng_pipe *stream_pipe; | |
ffe60014 DG |
200 | |
201 | /* Get the right pipe where the stream will be sent. */ | |
202 | if (stream->metadata_flag) { | |
5ab66908 MD |
203 | ret = consumer_add_metadata_stream(stream); |
204 | if (ret) { | |
205 | ERR("Consumer add metadata stream %" PRIu64 " failed.", | |
206 | stream->key); | |
207 | goto error; | |
208 | } | |
dae10966 | 209 | stream_pipe = ctx->consumer_metadata_pipe; |
ffe60014 | 210 | } else { |
5ab66908 MD |
211 | ret = consumer_add_data_stream(stream); |
212 | if (ret) { | |
213 | ERR("Consumer add stream %" PRIu64 " failed.", | |
214 | stream->key); | |
215 | goto error; | |
216 | } | |
dae10966 | 217 | stream_pipe = ctx->consumer_data_pipe; |
ffe60014 DG |
218 | } |
219 | ||
5ab66908 MD |
220 | /* |
221 | * From this point on, the stream's ownership has been moved away from | |
222 | * the channel and becomes globally visible. | |
223 | */ | |
224 | stream->globally_visible = 1; | |
225 | ||
dae10966 | 226 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
ffe60014 | 227 | if (ret < 0) { |
dae10966 DG |
228 | ERR("Consumer write %s stream to pipe %d", |
229 | stream->metadata_flag ? "metadata" : "data", | |
230 | lttng_pipe_get_writefd(stream_pipe)); | |
5ab66908 MD |
231 | if (stream->metadata_flag) { |
232 | consumer_del_stream_for_metadata(stream); | |
233 | } else { | |
234 | consumer_del_stream_for_data(stream); | |
235 | } | |
ffe60014 | 236 | } |
5ab66908 | 237 | error: |
ffe60014 DG |
238 | return ret; |
239 | } | |
240 | ||
d88aee68 DG |
241 | /* |
242 | * Create streams for the given channel using liblttng-ust-ctl. | |
243 | * | |
244 | * Return 0 on success else a negative value. | |
245 | */ | |
ffe60014 DG |
246 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
247 | struct lttng_consumer_local_data *ctx) | |
248 | { | |
249 | int ret, cpu = 0; | |
250 | struct ustctl_consumer_stream *ustream; | |
251 | struct lttng_consumer_stream *stream; | |
252 | ||
253 | assert(channel); | |
254 | assert(ctx); | |
255 | ||
256 | /* | |
257 | * While a stream is available from ustctl. When NULL is returned, we've | |
258 | * reached the end of the possible stream for the channel. | |
259 | */ | |
260 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { | |
261 | int wait_fd; | |
04ef1097 | 262 | int ust_metadata_pipe[2]; |
ffe60014 | 263 | |
9ce5646a MD |
264 | health_code_update(); |
265 | ||
04ef1097 MD |
266 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
267 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); | |
268 | if (ret < 0) { | |
269 | ERR("Create ust metadata poll pipe"); | |
270 | goto error; | |
271 | } | |
272 | wait_fd = ust_metadata_pipe[0]; | |
273 | } else { | |
274 | wait_fd = ustctl_stream_get_wait_fd(ustream); | |
275 | } | |
ffe60014 DG |
276 | |
277 | /* Allocate consumer stream object. */ | |
278 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); | |
279 | if (!stream) { | |
280 | goto error_alloc; | |
281 | } | |
282 | stream->ustream = ustream; | |
283 | /* | |
284 | * Store it so we can save multiple function calls afterwards since | |
285 | * this value is used heavily in the stream threads. This is UST | |
286 | * specific so this is why it's done after allocation. | |
287 | */ | |
288 | stream->wait_fd = wait_fd; | |
289 | ||
b31398bb DG |
290 | /* |
291 | * Increment channel refcount since the channel reference has now been | |
292 | * assigned in the allocation process above. | |
293 | */ | |
10a50311 JD |
294 | if (stream->chan->monitor) { |
295 | uatomic_inc(&stream->chan->refcount); | |
296 | } | |
b31398bb | 297 | |
ffe60014 DG |
298 | /* |
299 | * Order is important this is why a list is used. On error, the caller | |
300 | * should clean this list. | |
301 | */ | |
302 | cds_list_add_tail(&stream->send_node, &channel->streams.head); | |
303 | ||
304 | ret = ustctl_get_max_subbuf_size(stream->ustream, | |
305 | &stream->max_sb_size); | |
306 | if (ret < 0) { | |
307 | ERR("ustctl_get_max_subbuf_size failed for stream %s", | |
308 | stream->name); | |
309 | goto error; | |
310 | } | |
311 | ||
312 | /* Do actions once stream has been received. */ | |
313 | if (ctx->on_recv_stream) { | |
314 | ret = ctx->on_recv_stream(stream); | |
315 | if (ret < 0) { | |
316 | goto error; | |
317 | } | |
318 | } | |
319 | ||
d88aee68 | 320 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
ffe60014 DG |
321 | stream->name, stream->key, stream->relayd_stream_id); |
322 | ||
323 | /* Set next CPU stream. */ | |
324 | channel->streams.count = ++cpu; | |
d88aee68 DG |
325 | |
326 | /* Keep stream reference when creating metadata. */ | |
327 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { | |
328 | channel->metadata_stream = stream; | |
04ef1097 MD |
329 | stream->ust_metadata_poll_pipe[0] = ust_metadata_pipe[0]; |
330 | stream->ust_metadata_poll_pipe[1] = ust_metadata_pipe[1]; | |
d88aee68 | 331 | } |
ffe60014 DG |
332 | } |
333 | ||
334 | return 0; | |
335 | ||
336 | error: | |
337 | error_alloc: | |
338 | return ret; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Create an UST channel with the given attributes and send it to the session | |
343 | * daemon using the ust ctl API. | |
344 | * | |
345 | * Return 0 on success or else a negative value. | |
346 | */ | |
347 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, | |
348 | struct ustctl_consumer_channel **chanp) | |
349 | { | |
350 | int ret; | |
351 | struct ustctl_consumer_channel *channel; | |
352 | ||
353 | assert(attr); | |
354 | assert(chanp); | |
355 | ||
356 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " | |
357 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " | |
358 | "switch_timer_interval: %u, read_timer_interval: %u, " | |
359 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, | |
360 | attr->num_subbuf, attr->switch_timer_interval, | |
361 | attr->read_timer_interval, attr->output, attr->type); | |
362 | ||
363 | channel = ustctl_create_channel(attr); | |
364 | if (!channel) { | |
365 | ret = -1; | |
366 | goto error_create; | |
367 | } | |
368 | ||
369 | *chanp = channel; | |
370 | ||
371 | return 0; | |
372 | ||
373 | error_create: | |
374 | return ret; | |
375 | } | |
376 | ||
d88aee68 DG |
377 | /* |
378 | * Send a single given stream to the session daemon using the sock. | |
379 | * | |
380 | * Return 0 on success else a negative value. | |
381 | */ | |
ffe60014 DG |
382 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
383 | { | |
384 | int ret; | |
385 | ||
386 | assert(stream); | |
387 | assert(sock >= 0); | |
388 | ||
3eb914c0 | 389 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
ffe60014 DG |
390 | |
391 | /* Send stream to session daemon. */ | |
392 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); | |
393 | if (ret < 0) { | |
394 | goto error; | |
395 | } | |
396 | ||
ffe60014 DG |
397 | error: |
398 | return ret; | |
399 | } | |
400 | ||
401 | /* | |
402 | * Send channel to sessiond. | |
403 | * | |
d88aee68 | 404 | * Return 0 on success or else a negative value. |
ffe60014 DG |
405 | */ |
406 | static int send_sessiond_channel(int sock, | |
407 | struct lttng_consumer_channel *channel, | |
408 | struct lttng_consumer_local_data *ctx, int *relayd_error) | |
409 | { | |
f2a444f1 | 410 | int ret, ret_code = LTTNG_OK; |
ffe60014 DG |
411 | struct lttng_consumer_stream *stream; |
412 | ||
413 | assert(channel); | |
414 | assert(ctx); | |
415 | assert(sock >= 0); | |
416 | ||
417 | DBG("UST consumer sending channel %s to sessiond", channel->name); | |
418 | ||
62285ea4 DG |
419 | if (channel->relayd_id != (uint64_t) -1ULL) { |
420 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
421 | |
422 | health_code_update(); | |
423 | ||
62285ea4 DG |
424 | /* Try to send the stream to the relayd if one is available. */ |
425 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); | |
426 | if (ret < 0) { | |
427 | /* | |
428 | * Flag that the relayd was the problem here probably due to a | |
429 | * communicaton error on the socket. | |
430 | */ | |
431 | if (relayd_error) { | |
432 | *relayd_error = 1; | |
433 | } | |
434 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; | |
ffe60014 | 435 | } |
ffe60014 | 436 | } |
f2a444f1 | 437 | } |
ffe60014 | 438 | |
f2a444f1 DG |
439 | /* Inform sessiond that we are about to send channel and streams. */ |
440 | ret = consumer_send_status_msg(sock, ret_code); | |
441 | if (ret < 0 || ret_code != LTTNG_OK) { | |
442 | /* | |
443 | * Either the session daemon is not responding or the relayd died so we | |
444 | * stop now. | |
445 | */ | |
446 | goto error; | |
447 | } | |
448 | ||
449 | /* Send channel to sessiond. */ | |
450 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); | |
451 | if (ret < 0) { | |
452 | goto error; | |
453 | } | |
454 | ||
455 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); | |
456 | if (ret < 0) { | |
457 | goto error; | |
458 | } | |
459 | ||
460 | /* The channel was sent successfully to the sessiond at this point. */ | |
461 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
462 | |
463 | health_code_update(); | |
464 | ||
ffe60014 DG |
465 | /* Send stream to session daemon. */ |
466 | ret = send_sessiond_stream(sock, stream); | |
467 | if (ret < 0) { | |
468 | goto error; | |
469 | } | |
470 | } | |
471 | ||
472 | /* Tell sessiond there is no more stream. */ | |
473 | ret = ustctl_send_stream_to_sessiond(sock, NULL); | |
474 | if (ret < 0) { | |
475 | goto error; | |
476 | } | |
477 | ||
478 | DBG("UST consumer NULL stream sent to sessiond"); | |
479 | ||
480 | return 0; | |
481 | ||
482 | error: | |
f2a444f1 DG |
483 | if (ret_code != LTTNG_OK) { |
484 | ret = -1; | |
485 | } | |
ffe60014 DG |
486 | return ret; |
487 | } | |
488 | ||
489 | /* | |
490 | * Creates a channel and streams and add the channel it to the channel internal | |
491 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is | |
492 | * received. | |
493 | * | |
494 | * Return 0 on success or else, a negative value is returned and the channel | |
495 | * MUST be destroyed by consumer_del_channel(). | |
496 | */ | |
497 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, | |
498 | struct lttng_consumer_channel *channel, | |
499 | struct ustctl_consumer_channel_attr *attr) | |
3bd1e081 MD |
500 | { |
501 | int ret; | |
502 | ||
ffe60014 DG |
503 | assert(ctx); |
504 | assert(channel); | |
505 | assert(attr); | |
506 | ||
507 | /* | |
508 | * This value is still used by the kernel consumer since for the kernel, | |
509 | * the stream ownership is not IN the consumer so we need to have the | |
510 | * number of left stream that needs to be initialized so we can know when | |
511 | * to delete the channel (see consumer.c). | |
512 | * | |
513 | * As for the user space tracer now, the consumer creates and sends the | |
514 | * stream to the session daemon which only sends them to the application | |
515 | * once every stream of a channel is received making this value useless | |
516 | * because we they will be added to the poll thread before the application | |
517 | * receives them. This ensures that a stream can not hang up during | |
518 | * initilization of a channel. | |
519 | */ | |
520 | channel->nb_init_stream_left = 0; | |
521 | ||
522 | /* The reply msg status is handled in the following call. */ | |
523 | ret = create_ust_channel(attr, &channel->uchan); | |
524 | if (ret < 0) { | |
10a50311 | 525 | goto end; |
3bd1e081 MD |
526 | } |
527 | ||
d8ef542d MD |
528 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
529 | ||
10a50311 JD |
530 | /* |
531 | * For the snapshots (no monitor), we create the metadata streams | |
532 | * on demand, not during the channel creation. | |
533 | */ | |
534 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { | |
535 | ret = 0; | |
536 | goto end; | |
537 | } | |
538 | ||
ffe60014 DG |
539 | /* Open all streams for this channel. */ |
540 | ret = create_ust_streams(channel, ctx); | |
541 | if (ret < 0) { | |
10a50311 | 542 | goto end; |
ffe60014 DG |
543 | } |
544 | ||
10a50311 | 545 | end: |
3bd1e081 MD |
546 | return ret; |
547 | } | |
548 | ||
d88aee68 DG |
549 | /* |
550 | * Send all stream of a channel to the right thread handling it. | |
551 | * | |
552 | * On error, return a negative value else 0 on success. | |
553 | */ | |
554 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, | |
555 | struct lttng_consumer_local_data *ctx) | |
556 | { | |
557 | int ret = 0; | |
558 | struct lttng_consumer_stream *stream, *stmp; | |
559 | ||
560 | assert(channel); | |
561 | assert(ctx); | |
562 | ||
563 | /* Send streams to the corresponding thread. */ | |
564 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, | |
565 | send_node) { | |
9ce5646a MD |
566 | |
567 | health_code_update(); | |
568 | ||
d88aee68 DG |
569 | /* Sending the stream to the thread. */ |
570 | ret = send_stream_to_thread(stream, ctx); | |
571 | if (ret < 0) { | |
572 | /* | |
573 | * If we are unable to send the stream to the thread, there is | |
574 | * a big problem so just stop everything. | |
575 | */ | |
5ab66908 MD |
576 | /* Remove node from the channel stream list. */ |
577 | cds_list_del(&stream->send_node); | |
d88aee68 DG |
578 | goto error; |
579 | } | |
580 | ||
581 | /* Remove node from the channel stream list. */ | |
582 | cds_list_del(&stream->send_node); | |
4891ece8 | 583 | |
d88aee68 DG |
584 | } |
585 | ||
586 | error: | |
587 | return ret; | |
588 | } | |
589 | ||
7972aab2 DG |
590 | /* |
591 | * Flush channel's streams using the given key to retrieve the channel. | |
592 | * | |
593 | * Return 0 on success else an LTTng error code. | |
594 | */ | |
595 | static int flush_channel(uint64_t chan_key) | |
596 | { | |
597 | int ret = 0; | |
598 | struct lttng_consumer_channel *channel; | |
599 | struct lttng_consumer_stream *stream; | |
600 | struct lttng_ht *ht; | |
601 | struct lttng_ht_iter iter; | |
602 | ||
8fd623e0 | 603 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
7972aab2 | 604 | |
a500c257 | 605 | rcu_read_lock(); |
7972aab2 DG |
606 | channel = consumer_find_channel(chan_key); |
607 | if (!channel) { | |
8fd623e0 | 608 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
7972aab2 DG |
609 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
610 | goto error; | |
611 | } | |
612 | ||
613 | ht = consumer_data.stream_per_chan_id_ht; | |
614 | ||
615 | /* For each stream of the channel id, flush it. */ | |
7972aab2 DG |
616 | cds_lfht_for_each_entry_duplicate(ht->ht, |
617 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, | |
618 | &channel->key, &iter.iter, stream, node_channel_id.node) { | |
9ce5646a MD |
619 | |
620 | health_code_update(); | |
621 | ||
b8086166 | 622 | ustctl_flush_buffer(stream->ustream, 1); |
7972aab2 | 623 | } |
7972aab2 | 624 | error: |
a500c257 | 625 | rcu_read_unlock(); |
7972aab2 DG |
626 | return ret; |
627 | } | |
be2b50c7 DG |
628 | /* |
629 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
630 | * RCU read side lock MUST be acquired before calling this function. | |
631 | * | |
632 | * NOTE: This function does NOT take any channel nor stream lock. | |
633 | * | |
634 | * Return 0 on success else LTTng error code. | |
635 | */ | |
636 | static int _close_metadata(struct lttng_consumer_channel *channel) | |
637 | { | |
638 | int ret = LTTNG_OK; | |
639 | ||
640 | assert(channel); | |
641 | assert(channel->type == CONSUMER_CHANNEL_TYPE_METADATA); | |
642 | ||
643 | if (channel->switch_timer_enabled == 1) { | |
644 | DBG("Deleting timer on metadata channel"); | |
645 | consumer_timer_switch_stop(channel); | |
646 | } | |
647 | ||
648 | if (channel->metadata_stream) { | |
649 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); | |
650 | if (ret < 0) { | |
651 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); | |
652 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
653 | } | |
654 | ||
655 | if (channel->monitor) { | |
656 | /* Close the read-side in consumer_del_metadata_stream */ | |
657 | ret = close(channel->metadata_stream->ust_metadata_poll_pipe[1]); | |
658 | if (ret < 0) { | |
659 | PERROR("Close UST metadata write-side poll pipe"); | |
660 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
661 | } | |
662 | } | |
663 | } | |
664 | ||
665 | return ret; | |
666 | } | |
7972aab2 | 667 | |
d88aee68 DG |
668 | /* |
669 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. | |
a500c257 | 670 | * RCU read side lock MUST be acquired before calling this function. |
d88aee68 DG |
671 | * |
672 | * Return 0 on success else an LTTng error code. | |
673 | */ | |
674 | static int close_metadata(uint64_t chan_key) | |
675 | { | |
ea88ca2a | 676 | int ret = 0; |
d88aee68 DG |
677 | struct lttng_consumer_channel *channel; |
678 | ||
8fd623e0 | 679 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
d88aee68 DG |
680 | |
681 | channel = consumer_find_channel(chan_key); | |
682 | if (!channel) { | |
84cc9aa0 DG |
683 | /* |
684 | * This is possible if the metadata thread has issue a delete because | |
685 | * the endpoint point of the stream hung up. There is no way the | |
686 | * session daemon can know about it thus use a DBG instead of an actual | |
687 | * error. | |
688 | */ | |
689 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); | |
d88aee68 DG |
690 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
691 | goto error; | |
692 | } | |
693 | ||
ea88ca2a | 694 | pthread_mutex_lock(&consumer_data.lock); |
a9838785 | 695 | pthread_mutex_lock(&channel->lock); |
73811ecc DG |
696 | |
697 | if (cds_lfht_is_node_deleted(&channel->node.node)) { | |
698 | goto error_unlock; | |
699 | } | |
700 | ||
be2b50c7 | 701 | ret = _close_metadata(channel); |
d88aee68 | 702 | |
ea88ca2a | 703 | error_unlock: |
a9838785 | 704 | pthread_mutex_unlock(&channel->lock); |
ea88ca2a | 705 | pthread_mutex_unlock(&consumer_data.lock); |
d88aee68 DG |
706 | error: |
707 | return ret; | |
708 | } | |
709 | ||
710 | /* | |
711 | * RCU read side lock MUST be acquired before calling this function. | |
712 | * | |
713 | * Return 0 on success else an LTTng error code. | |
714 | */ | |
715 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) | |
716 | { | |
717 | int ret; | |
718 | struct lttng_consumer_channel *metadata; | |
719 | ||
8fd623e0 | 720 | DBG("UST consumer setup metadata key %" PRIu64, key); |
d88aee68 DG |
721 | |
722 | metadata = consumer_find_channel(key); | |
723 | if (!metadata) { | |
724 | ERR("UST consumer push metadata %" PRIu64 " not found", key); | |
725 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; | |
10a50311 JD |
726 | goto end; |
727 | } | |
728 | ||
729 | /* | |
730 | * In no monitor mode, the metadata channel has no stream(s) so skip the | |
731 | * ownership transfer to the metadata thread. | |
732 | */ | |
733 | if (!metadata->monitor) { | |
734 | DBG("Metadata channel in no monitor"); | |
735 | ret = 0; | |
736 | goto end; | |
d88aee68 DG |
737 | } |
738 | ||
739 | /* | |
740 | * Send metadata stream to relayd if one available. Availability is | |
741 | * known if the stream is still in the list of the channel. | |
742 | */ | |
743 | if (cds_list_empty(&metadata->streams.head)) { | |
744 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); | |
745 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
f5a0c9cf | 746 | goto error_no_stream; |
d88aee68 DG |
747 | } |
748 | ||
749 | /* Send metadata stream to relayd if needed. */ | |
62285ea4 DG |
750 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
751 | ret = consumer_send_relayd_stream(metadata->metadata_stream, | |
752 | metadata->pathname); | |
753 | if (ret < 0) { | |
754 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
755 | goto error; | |
756 | } | |
d88aee68 DG |
757 | } |
758 | ||
759 | ret = send_streams_to_thread(metadata, ctx); | |
760 | if (ret < 0) { | |
761 | /* | |
762 | * If we are unable to send the stream to the thread, there is | |
763 | * a big problem so just stop everything. | |
764 | */ | |
765 | ret = LTTCOMM_CONSUMERD_FATAL; | |
766 | goto error; | |
767 | } | |
768 | /* List MUST be empty after or else it could be reused. */ | |
769 | assert(cds_list_empty(&metadata->streams.head)); | |
770 | ||
10a50311 JD |
771 | ret = 0; |
772 | goto end; | |
d88aee68 DG |
773 | |
774 | error: | |
f2a444f1 DG |
775 | /* |
776 | * Delete metadata channel on error. At this point, the metadata stream can | |
777 | * NOT be monitored by the metadata thread thus having the guarantee that | |
778 | * the stream is still in the local stream list of the channel. This call | |
779 | * will make sure to clean that list. | |
780 | */ | |
f5a0c9cf DG |
781 | cds_list_del(&metadata->metadata_stream->send_node); |
782 | consumer_stream_destroy(metadata->metadata_stream, NULL); | |
783 | error_no_stream: | |
10a50311 JD |
784 | end: |
785 | return ret; | |
786 | } | |
787 | ||
788 | /* | |
789 | * Snapshot the whole metadata. | |
790 | * | |
791 | * Returns 0 on success, < 0 on error | |
792 | */ | |
793 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, | |
794 | struct lttng_consumer_local_data *ctx) | |
795 | { | |
796 | int ret = 0; | |
10a50311 JD |
797 | struct lttng_consumer_channel *metadata_channel; |
798 | struct lttng_consumer_stream *metadata_stream; | |
799 | ||
800 | assert(path); | |
801 | assert(ctx); | |
802 | ||
803 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", | |
804 | key, path); | |
805 | ||
806 | rcu_read_lock(); | |
807 | ||
808 | metadata_channel = consumer_find_channel(key); | |
809 | if (!metadata_channel) { | |
6a00837f MD |
810 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
811 | key); | |
10a50311 JD |
812 | ret = -1; |
813 | goto error; | |
814 | } | |
815 | assert(!metadata_channel->monitor); | |
816 | ||
9ce5646a MD |
817 | health_code_update(); |
818 | ||
10a50311 JD |
819 | /* |
820 | * Ask the sessiond if we have new metadata waiting and update the | |
821 | * consumer metadata cache. | |
822 | */ | |
94d49140 | 823 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
10a50311 JD |
824 | if (ret < 0) { |
825 | goto error; | |
826 | } | |
827 | ||
9ce5646a MD |
828 | health_code_update(); |
829 | ||
10a50311 JD |
830 | /* |
831 | * The metadata stream is NOT created in no monitor mode when the channel | |
832 | * is created on a sessiond ask channel command. | |
833 | */ | |
834 | ret = create_ust_streams(metadata_channel, ctx); | |
835 | if (ret < 0) { | |
836 | goto error; | |
837 | } | |
838 | ||
839 | metadata_stream = metadata_channel->metadata_stream; | |
840 | assert(metadata_stream); | |
841 | ||
842 | if (relayd_id != (uint64_t) -1ULL) { | |
843 | metadata_stream->net_seq_idx = relayd_id; | |
844 | ret = consumer_send_relayd_stream(metadata_stream, path); | |
845 | if (ret < 0) { | |
846 | goto error_stream; | |
847 | } | |
848 | } else { | |
849 | ret = utils_create_stream_file(path, metadata_stream->name, | |
850 | metadata_stream->chan->tracefile_size, | |
851 | metadata_stream->tracefile_count_current, | |
309167d2 | 852 | metadata_stream->uid, metadata_stream->gid, NULL); |
10a50311 JD |
853 | if (ret < 0) { |
854 | goto error_stream; | |
855 | } | |
856 | metadata_stream->out_fd = ret; | |
857 | metadata_stream->tracefile_size_current = 0; | |
858 | } | |
859 | ||
04ef1097 | 860 | do { |
9ce5646a MD |
861 | health_code_update(); |
862 | ||
10a50311 JD |
863 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
864 | if (ret < 0) { | |
94d49140 | 865 | goto error_stream; |
10a50311 | 866 | } |
04ef1097 | 867 | } while (ret > 0); |
10a50311 | 868 | |
10a50311 JD |
869 | error_stream: |
870 | /* | |
871 | * Clean up the stream completly because the next snapshot will use a new | |
872 | * metadata stream. | |
873 | */ | |
874 | cds_list_del(&metadata_stream->send_node); | |
875 | consumer_stream_destroy(metadata_stream, NULL); | |
876 | metadata_channel->metadata_stream = NULL; | |
877 | ||
878 | error: | |
879 | rcu_read_unlock(); | |
880 | return ret; | |
881 | } | |
882 | ||
883 | /* | |
884 | * Take a snapshot of all the stream of a channel. | |
885 | * | |
886 | * Returns 0 on success, < 0 on error | |
887 | */ | |
888 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, | |
5c786ded | 889 | uint64_t max_stream_size, struct lttng_consumer_local_data *ctx) |
10a50311 JD |
890 | { |
891 | int ret; | |
892 | unsigned use_relayd = 0; | |
893 | unsigned long consumed_pos, produced_pos; | |
894 | struct lttng_consumer_channel *channel; | |
895 | struct lttng_consumer_stream *stream; | |
896 | ||
897 | assert(path); | |
898 | assert(ctx); | |
899 | ||
900 | rcu_read_lock(); | |
901 | ||
902 | if (relayd_id != (uint64_t) -1ULL) { | |
903 | use_relayd = 1; | |
904 | } | |
905 | ||
906 | channel = consumer_find_channel(key); | |
907 | if (!channel) { | |
6a00837f | 908 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
10a50311 JD |
909 | ret = -1; |
910 | goto error; | |
911 | } | |
912 | assert(!channel->monitor); | |
6a00837f | 913 | DBG("UST consumer snapshot channel %" PRIu64, key); |
10a50311 JD |
914 | |
915 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { | |
9ce5646a MD |
916 | |
917 | health_code_update(); | |
918 | ||
10a50311 JD |
919 | /* Lock stream because we are about to change its state. */ |
920 | pthread_mutex_lock(&stream->lock); | |
921 | stream->net_seq_idx = relayd_id; | |
922 | ||
923 | if (use_relayd) { | |
924 | ret = consumer_send_relayd_stream(stream, path); | |
925 | if (ret < 0) { | |
926 | goto error_unlock; | |
927 | } | |
928 | } else { | |
929 | ret = utils_create_stream_file(path, stream->name, | |
930 | stream->chan->tracefile_size, | |
931 | stream->tracefile_count_current, | |
309167d2 | 932 | stream->uid, stream->gid, NULL); |
10a50311 JD |
933 | if (ret < 0) { |
934 | goto error_unlock; | |
935 | } | |
936 | stream->out_fd = ret; | |
937 | stream->tracefile_size_current = 0; | |
938 | ||
939 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, | |
940 | stream->name, stream->key); | |
941 | } | |
942 | ||
943 | ustctl_flush_buffer(stream->ustream, 1); | |
944 | ||
945 | ret = lttng_ustconsumer_take_snapshot(stream); | |
946 | if (ret < 0) { | |
947 | ERR("Taking UST snapshot"); | |
948 | goto error_unlock; | |
949 | } | |
950 | ||
951 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); | |
952 | if (ret < 0) { | |
953 | ERR("Produced UST snapshot position"); | |
954 | goto error_unlock; | |
955 | } | |
956 | ||
957 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); | |
958 | if (ret < 0) { | |
959 | ERR("Consumerd UST snapshot position"); | |
960 | goto error_unlock; | |
961 | } | |
962 | ||
5c786ded JD |
963 | /* |
964 | * The original value is sent back if max stream size is larger than | |
965 | * the possible size of the snapshot. Also, we asume that the session | |
966 | * daemon should never send a maximum stream size that is lower than | |
967 | * subbuffer size. | |
968 | */ | |
969 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, | |
970 | produced_pos, max_stream_size); | |
971 | ||
10a50311 JD |
972 | while (consumed_pos < produced_pos) { |
973 | ssize_t read_len; | |
974 | unsigned long len, padded_len; | |
975 | ||
9ce5646a MD |
976 | health_code_update(); |
977 | ||
10a50311 JD |
978 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
979 | ||
980 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); | |
981 | if (ret < 0) { | |
982 | if (ret != -EAGAIN) { | |
983 | PERROR("ustctl_get_subbuf snapshot"); | |
984 | goto error_close_stream; | |
985 | } | |
986 | DBG("UST consumer get subbuf failed. Skipping it."); | |
987 | consumed_pos += stream->max_sb_size; | |
988 | continue; | |
989 | } | |
990 | ||
991 | ret = ustctl_get_subbuf_size(stream->ustream, &len); | |
992 | if (ret < 0) { | |
993 | ERR("Snapshot ustctl_get_subbuf_size"); | |
994 | goto error_put_subbuf; | |
995 | } | |
996 | ||
997 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); | |
998 | if (ret < 0) { | |
999 | ERR("Snapshot ustctl_get_padded_subbuf_size"); | |
1000 | goto error_put_subbuf; | |
1001 | } | |
1002 | ||
1003 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, | |
309167d2 | 1004 | padded_len - len, NULL); |
10a50311 JD |
1005 | if (use_relayd) { |
1006 | if (read_len != len) { | |
56591bac | 1007 | ret = -EPERM; |
10a50311 JD |
1008 | goto error_put_subbuf; |
1009 | } | |
1010 | } else { | |
1011 | if (read_len != padded_len) { | |
56591bac | 1012 | ret = -EPERM; |
10a50311 JD |
1013 | goto error_put_subbuf; |
1014 | } | |
1015 | } | |
1016 | ||
1017 | ret = ustctl_put_subbuf(stream->ustream); | |
1018 | if (ret < 0) { | |
1019 | ERR("Snapshot ustctl_put_subbuf"); | |
1020 | goto error_close_stream; | |
1021 | } | |
1022 | consumed_pos += stream->max_sb_size; | |
1023 | } | |
1024 | ||
1025 | /* Simply close the stream so we can use it on the next snapshot. */ | |
1026 | consumer_stream_close(stream); | |
1027 | pthread_mutex_unlock(&stream->lock); | |
1028 | } | |
1029 | ||
1030 | rcu_read_unlock(); | |
1031 | return 0; | |
1032 | ||
1033 | error_put_subbuf: | |
1034 | if (ustctl_put_subbuf(stream->ustream) < 0) { | |
1035 | ERR("Snapshot ustctl_put_subbuf"); | |
1036 | } | |
1037 | error_close_stream: | |
1038 | consumer_stream_close(stream); | |
1039 | error_unlock: | |
1040 | pthread_mutex_unlock(&stream->lock); | |
1041 | error: | |
1042 | rcu_read_unlock(); | |
d88aee68 DG |
1043 | return ret; |
1044 | } | |
1045 | ||
331744e3 JD |
1046 | /* |
1047 | * Receive the metadata updates from the sessiond. | |
1048 | */ | |
1049 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, | |
5e41ebe1 | 1050 | uint64_t len, struct lttng_consumer_channel *channel, |
94d49140 | 1051 | int timer, int wait) |
331744e3 JD |
1052 | { |
1053 | int ret, ret_code = LTTNG_OK; | |
1054 | char *metadata_str; | |
1055 | ||
8fd623e0 | 1056 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
331744e3 JD |
1057 | |
1058 | metadata_str = zmalloc(len * sizeof(char)); | |
1059 | if (!metadata_str) { | |
1060 | PERROR("zmalloc metadata string"); | |
1061 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; | |
1062 | goto end; | |
1063 | } | |
1064 | ||
9ce5646a MD |
1065 | health_code_update(); |
1066 | ||
331744e3 JD |
1067 | /* Receive metadata string. */ |
1068 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); | |
1069 | if (ret < 0) { | |
1070 | /* Session daemon is dead so return gracefully. */ | |
1071 | ret_code = ret; | |
1072 | goto end_free; | |
1073 | } | |
1074 | ||
9ce5646a MD |
1075 | health_code_update(); |
1076 | ||
331744e3 JD |
1077 | pthread_mutex_lock(&channel->metadata_cache->lock); |
1078 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); | |
1079 | if (ret < 0) { | |
1080 | /* Unable to handle metadata. Notify session daemon. */ | |
1081 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; | |
a32bd775 DG |
1082 | /* |
1083 | * Skip metadata flush on write error since the offset and len might | |
1084 | * not have been updated which could create an infinite loop below when | |
1085 | * waiting for the metadata cache to be flushed. | |
1086 | */ | |
1087 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
a32bd775 | 1088 | goto end_free; |
331744e3 JD |
1089 | } |
1090 | pthread_mutex_unlock(&channel->metadata_cache->lock); | |
1091 | ||
94d49140 JD |
1092 | if (!wait) { |
1093 | goto end_free; | |
1094 | } | |
5e41ebe1 | 1095 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
331744e3 | 1096 | DBG("Waiting for metadata to be flushed"); |
9ce5646a MD |
1097 | |
1098 | health_code_update(); | |
1099 | ||
331744e3 JD |
1100 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
1101 | } | |
1102 | ||
1103 | end_free: | |
1104 | free(metadata_str); | |
1105 | end: | |
1106 | return ret_code; | |
1107 | } | |
1108 | ||
4cbc1a04 DG |
1109 | /* |
1110 | * Receive command from session daemon and process it. | |
1111 | * | |
1112 | * Return 1 on success else a negative value or 0. | |
1113 | */ | |
3bd1e081 MD |
1114 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
1115 | int sock, struct pollfd *consumer_sockpoll) | |
1116 | { | |
1117 | ssize_t ret; | |
f50f23d9 | 1118 | enum lttng_error_code ret_code = LTTNG_OK; |
3bd1e081 | 1119 | struct lttcomm_consumer_msg msg; |
ffe60014 | 1120 | struct lttng_consumer_channel *channel = NULL; |
3bd1e081 | 1121 | |
9ce5646a MD |
1122 | health_code_update(); |
1123 | ||
3bd1e081 MD |
1124 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
1125 | if (ret != sizeof(msg)) { | |
173af62f DG |
1126 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
1127 | ret, sizeof(msg)); | |
3be74084 DG |
1128 | /* |
1129 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
1130 | * since the caller handles this. | |
1131 | */ | |
489f70e9 | 1132 | if (ret > 0) { |
c6857fcf | 1133 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
489f70e9 MD |
1134 | ret = -1; |
1135 | } | |
3bd1e081 MD |
1136 | return ret; |
1137 | } | |
9ce5646a MD |
1138 | |
1139 | health_code_update(); | |
1140 | ||
3bd1e081 | 1141 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { |
f50f23d9 DG |
1142 | /* |
1143 | * Notify the session daemon that the command is completed. | |
1144 | * | |
1145 | * On transport layer error, the function call will print an error | |
1146 | * message so handling the returned code is a bit useless since we | |
1147 | * return an error code anyway. | |
1148 | */ | |
1149 | (void) consumer_send_status_msg(sock, ret_code); | |
3bd1e081 MD |
1150 | return -ENOENT; |
1151 | } | |
1152 | ||
9ce5646a MD |
1153 | health_code_update(); |
1154 | ||
3f8e211f | 1155 | /* relayd needs RCU read-side lock */ |
b0b335c8 MD |
1156 | rcu_read_lock(); |
1157 | ||
3bd1e081 | 1158 | switch (msg.cmd_type) { |
00e2e675 DG |
1159 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
1160 | { | |
f50f23d9 | 1161 | /* Session daemon status message are handled in the following call. */ |
7735ef9e DG |
1162 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
1163 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, | |
d3e2ba59 JD |
1164 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
1165 | msg.u.relayd_sock.relayd_session_id); | |
00e2e675 DG |
1166 | goto end_nosignal; |
1167 | } | |
173af62f DG |
1168 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
1169 | { | |
a6ba4fe1 | 1170 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
173af62f DG |
1171 | struct consumer_relayd_sock_pair *relayd; |
1172 | ||
a6ba4fe1 | 1173 | DBG("UST consumer destroying relayd %" PRIu64, index); |
173af62f DG |
1174 | |
1175 | /* Get relayd reference if exists. */ | |
a6ba4fe1 | 1176 | relayd = consumer_find_relayd(index); |
173af62f | 1177 | if (relayd == NULL) { |
3448e266 | 1178 | DBG("Unable to find relayd %" PRIu64, index); |
f50f23d9 | 1179 | ret_code = LTTNG_ERR_NO_CONSUMER; |
173af62f DG |
1180 | } |
1181 | ||
a6ba4fe1 DG |
1182 | /* |
1183 | * Each relayd socket pair has a refcount of stream attached to it | |
1184 | * which tells if the relayd is still active or not depending on the | |
1185 | * refcount value. | |
1186 | * | |
1187 | * This will set the destroy flag of the relayd object and destroy it | |
1188 | * if the refcount reaches zero when called. | |
1189 | * | |
1190 | * The destroy can happen either here or when a stream fd hangs up. | |
1191 | */ | |
f50f23d9 DG |
1192 | if (relayd) { |
1193 | consumer_flag_relayd_for_destroy(relayd); | |
1194 | } | |
1195 | ||
d88aee68 | 1196 | goto end_msg_sessiond; |
173af62f | 1197 | } |
3bd1e081 MD |
1198 | case LTTNG_CONSUMER_UPDATE_STREAM: |
1199 | { | |
3f8e211f | 1200 | rcu_read_unlock(); |
7ad0a0cb | 1201 | return -ENOSYS; |
3bd1e081 | 1202 | } |
6d805429 | 1203 | case LTTNG_CONSUMER_DATA_PENDING: |
53632229 | 1204 | { |
3be74084 | 1205 | int ret, is_data_pending; |
6d805429 | 1206 | uint64_t id = msg.u.data_pending.session_id; |
ca22feea | 1207 | |
6d805429 | 1208 | DBG("UST consumer data pending command for id %" PRIu64, id); |
ca22feea | 1209 | |
3be74084 | 1210 | is_data_pending = consumer_data_pending(id); |
ca22feea DG |
1211 | |
1212 | /* Send back returned value to session daemon */ | |
3be74084 DG |
1213 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
1214 | sizeof(is_data_pending)); | |
ca22feea | 1215 | if (ret < 0) { |
3be74084 | 1216 | DBG("Error when sending the data pending ret code: %d", ret); |
489f70e9 | 1217 | goto error_fatal; |
ca22feea | 1218 | } |
f50f23d9 DG |
1219 | |
1220 | /* | |
1221 | * No need to send back a status message since the data pending | |
1222 | * returned value is the response. | |
1223 | */ | |
ca22feea | 1224 | break; |
53632229 | 1225 | } |
ffe60014 DG |
1226 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
1227 | { | |
1228 | int ret; | |
1229 | struct ustctl_consumer_channel_attr attr; | |
1230 | ||
1231 | /* Create a plain object and reserve a channel key. */ | |
1232 | channel = allocate_channel(msg.u.ask_channel.session_id, | |
1233 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, | |
1234 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, | |
1235 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, | |
1624d5b7 JD |
1236 | (enum lttng_event_output) msg.u.ask_channel.output, |
1237 | msg.u.ask_channel.tracefile_size, | |
2bba9e53 | 1238 | msg.u.ask_channel.tracefile_count, |
1950109e | 1239 | msg.u.ask_channel.session_id_per_pid, |
ecc48a90 JD |
1240 | msg.u.ask_channel.monitor, |
1241 | msg.u.ask_channel.live_timer_interval); | |
ffe60014 DG |
1242 | if (!channel) { |
1243 | goto end_channel_error; | |
1244 | } | |
1245 | ||
567eb353 DG |
1246 | /* |
1247 | * Assign UST application UID to the channel. This value is ignored for | |
1248 | * per PID buffers. This is specific to UST thus setting this after the | |
1249 | * allocation. | |
1250 | */ | |
1251 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; | |
1252 | ||
ffe60014 DG |
1253 | /* Build channel attributes from received message. */ |
1254 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; | |
1255 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; | |
1256 | attr.overwrite = msg.u.ask_channel.overwrite; | |
1257 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; | |
1258 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; | |
7972aab2 | 1259 | attr.chan_id = msg.u.ask_channel.chan_id; |
10a50311 | 1260 | attr.output = msg.u.ask_channel.output; |
ffe60014 DG |
1261 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
1262 | ||
ffe60014 DG |
1263 | /* Translate and save channel type. */ |
1264 | switch (msg.u.ask_channel.type) { | |
1265 | case LTTNG_UST_CHAN_PER_CPU: | |
1266 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; | |
1267 | attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8633d6e3 MD |
1268 | /* |
1269 | * Set refcount to 1 for owner. Below, we will | |
1270 | * pass ownership to the | |
1271 | * consumer_thread_channel_poll() thread. | |
1272 | */ | |
1273 | channel->refcount = 1; | |
ffe60014 DG |
1274 | break; |
1275 | case LTTNG_UST_CHAN_METADATA: | |
1276 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; | |
1277 | attr.type = LTTNG_UST_CHAN_METADATA; | |
1278 | break; | |
1279 | default: | |
1280 | assert(0); | |
1281 | goto error_fatal; | |
1282 | }; | |
1283 | ||
9ce5646a MD |
1284 | health_code_update(); |
1285 | ||
ffe60014 DG |
1286 | ret = ask_channel(ctx, sock, channel, &attr); |
1287 | if (ret < 0) { | |
1288 | goto end_channel_error; | |
1289 | } | |
1290 | ||
fc643247 MD |
1291 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1292 | ret = consumer_metadata_cache_allocate(channel); | |
1293 | if (ret < 0) { | |
1294 | ERR("Allocating metadata cache"); | |
1295 | goto end_channel_error; | |
1296 | } | |
1297 | consumer_timer_switch_start(channel, attr.switch_timer_interval); | |
1298 | attr.switch_timer_interval = 0; | |
94d49140 JD |
1299 | } else { |
1300 | consumer_timer_live_start(channel, | |
1301 | msg.u.ask_channel.live_timer_interval); | |
fc643247 MD |
1302 | } |
1303 | ||
9ce5646a MD |
1304 | health_code_update(); |
1305 | ||
ffe60014 DG |
1306 | /* |
1307 | * Add the channel to the internal state AFTER all streams were created | |
1308 | * and successfully sent to session daemon. This way, all streams must | |
1309 | * be ready before this channel is visible to the threads. | |
fc643247 MD |
1310 | * If add_channel succeeds, ownership of the channel is |
1311 | * passed to consumer_thread_channel_poll(). | |
ffe60014 DG |
1312 | */ |
1313 | ret = add_channel(channel, ctx); | |
1314 | if (ret < 0) { | |
ea88ca2a MD |
1315 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
1316 | if (channel->switch_timer_enabled == 1) { | |
1317 | consumer_timer_switch_stop(channel); | |
1318 | } | |
1319 | consumer_metadata_cache_destroy(channel); | |
1320 | } | |
d3e2ba59 JD |
1321 | if (channel->live_timer_enabled == 1) { |
1322 | consumer_timer_live_stop(channel); | |
1323 | } | |
ffe60014 DG |
1324 | goto end_channel_error; |
1325 | } | |
1326 | ||
9ce5646a MD |
1327 | health_code_update(); |
1328 | ||
ffe60014 DG |
1329 | /* |
1330 | * Channel and streams are now created. Inform the session daemon that | |
1331 | * everything went well and should wait to receive the channel and | |
1332 | * streams with ustctl API. | |
1333 | */ | |
1334 | ret = consumer_send_status_channel(sock, channel); | |
1335 | if (ret < 0) { | |
1336 | /* | |
489f70e9 | 1337 | * There is probably a problem on the socket. |
ffe60014 | 1338 | */ |
489f70e9 | 1339 | goto error_fatal; |
ffe60014 DG |
1340 | } |
1341 | ||
1342 | break; | |
1343 | } | |
1344 | case LTTNG_CONSUMER_GET_CHANNEL: | |
1345 | { | |
1346 | int ret, relayd_err = 0; | |
d88aee68 | 1347 | uint64_t key = msg.u.get_channel.key; |
ffe60014 | 1348 | struct lttng_consumer_channel *channel; |
ffe60014 DG |
1349 | |
1350 | channel = consumer_find_channel(key); | |
1351 | if (!channel) { | |
8fd623e0 | 1352 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
ffe60014 DG |
1353 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
1354 | goto end_msg_sessiond; | |
1355 | } | |
1356 | ||
9ce5646a MD |
1357 | health_code_update(); |
1358 | ||
ffe60014 DG |
1359 | /* Send everything to sessiond. */ |
1360 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); | |
1361 | if (ret < 0) { | |
1362 | if (relayd_err) { | |
1363 | /* | |
1364 | * We were unable to send to the relayd the stream so avoid | |
1365 | * sending back a fatal error to the thread since this is OK | |
f2a444f1 DG |
1366 | * and the consumer can continue its work. The above call |
1367 | * has sent the error status message to the sessiond. | |
ffe60014 | 1368 | */ |
f2a444f1 | 1369 | goto end_nosignal; |
ffe60014 DG |
1370 | } |
1371 | /* | |
1372 | * The communicaton was broken hence there is a bad state between | |
1373 | * the consumer and sessiond so stop everything. | |
1374 | */ | |
1375 | goto error_fatal; | |
1376 | } | |
1377 | ||
9ce5646a MD |
1378 | health_code_update(); |
1379 | ||
10a50311 JD |
1380 | /* |
1381 | * In no monitor mode, the streams ownership is kept inside the channel | |
1382 | * so don't send them to the data thread. | |
1383 | */ | |
1384 | if (!channel->monitor) { | |
1385 | goto end_msg_sessiond; | |
1386 | } | |
1387 | ||
d88aee68 DG |
1388 | ret = send_streams_to_thread(channel, ctx); |
1389 | if (ret < 0) { | |
1390 | /* | |
1391 | * If we are unable to send the stream to the thread, there is | |
1392 | * a big problem so just stop everything. | |
1393 | */ | |
1394 | goto error_fatal; | |
ffe60014 | 1395 | } |
ffe60014 DG |
1396 | /* List MUST be empty after or else it could be reused. */ |
1397 | assert(cds_list_empty(&channel->streams.head)); | |
d88aee68 DG |
1398 | goto end_msg_sessiond; |
1399 | } | |
1400 | case LTTNG_CONSUMER_DESTROY_CHANNEL: | |
1401 | { | |
1402 | uint64_t key = msg.u.destroy_channel.key; | |
d88aee68 | 1403 | |
a0cbdd2e MD |
1404 | /* |
1405 | * Only called if streams have not been sent to stream | |
1406 | * manager thread. However, channel has been sent to | |
1407 | * channel manager thread. | |
1408 | */ | |
1409 | notify_thread_del_channel(ctx, key); | |
d88aee68 | 1410 | goto end_msg_sessiond; |
ffe60014 | 1411 | } |
d88aee68 DG |
1412 | case LTTNG_CONSUMER_CLOSE_METADATA: |
1413 | { | |
1414 | int ret; | |
1415 | ||
1416 | ret = close_metadata(msg.u.close_metadata.key); | |
1417 | if (ret != 0) { | |
1418 | ret_code = ret; | |
1419 | } | |
1420 | ||
1421 | goto end_msg_sessiond; | |
1422 | } | |
7972aab2 DG |
1423 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
1424 | { | |
1425 | int ret; | |
1426 | ||
1427 | ret = flush_channel(msg.u.flush_channel.key); | |
1428 | if (ret != 0) { | |
1429 | ret_code = ret; | |
1430 | } | |
1431 | ||
1432 | goto end_msg_sessiond; | |
1433 | } | |
d88aee68 | 1434 | case LTTNG_CONSUMER_PUSH_METADATA: |
ffe60014 DG |
1435 | { |
1436 | int ret; | |
d88aee68 | 1437 | uint64_t len = msg.u.push_metadata.len; |
d88aee68 | 1438 | uint64_t key = msg.u.push_metadata.key; |
331744e3 | 1439 | uint64_t offset = msg.u.push_metadata.target_offset; |
ffe60014 DG |
1440 | struct lttng_consumer_channel *channel; |
1441 | ||
8fd623e0 DG |
1442 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
1443 | len); | |
ffe60014 DG |
1444 | |
1445 | channel = consumer_find_channel(key); | |
1446 | if (!channel) { | |
8fd623e0 | 1447 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
ffe60014 | 1448 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
4a2eb0ca | 1449 | goto end_msg_sessiond; |
d88aee68 DG |
1450 | } |
1451 | ||
9ce5646a MD |
1452 | health_code_update(); |
1453 | ||
d88aee68 | 1454 | /* Tell session daemon we are ready to receive the metadata. */ |
ffe60014 DG |
1455 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
1456 | if (ret < 0) { | |
1457 | /* Somehow, the session daemon is not responding anymore. */ | |
d88aee68 DG |
1458 | goto error_fatal; |
1459 | } | |
1460 | ||
9ce5646a MD |
1461 | health_code_update(); |
1462 | ||
d88aee68 | 1463 | /* Wait for more data. */ |
9ce5646a MD |
1464 | health_poll_entry(); |
1465 | ret = lttng_consumer_poll_socket(consumer_sockpoll); | |
1466 | health_poll_exit(); | |
1467 | if (ret < 0) { | |
489f70e9 | 1468 | goto error_fatal; |
d88aee68 DG |
1469 | } |
1470 | ||
9ce5646a MD |
1471 | health_code_update(); |
1472 | ||
331744e3 | 1473 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
94d49140 | 1474 | len, channel, 0, 1); |
d88aee68 | 1475 | if (ret < 0) { |
331744e3 | 1476 | /* error receiving from sessiond */ |
489f70e9 | 1477 | goto error_fatal; |
331744e3 JD |
1478 | } else { |
1479 | ret_code = ret; | |
d88aee68 DG |
1480 | goto end_msg_sessiond; |
1481 | } | |
d88aee68 DG |
1482 | } |
1483 | case LTTNG_CONSUMER_SETUP_METADATA: | |
1484 | { | |
1485 | int ret; | |
1486 | ||
1487 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); | |
1488 | if (ret) { | |
1489 | ret_code = ret; | |
1490 | } | |
1491 | goto end_msg_sessiond; | |
ffe60014 | 1492 | } |
6dc3064a DG |
1493 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
1494 | { | |
10a50311 JD |
1495 | if (msg.u.snapshot_channel.metadata) { |
1496 | ret = snapshot_metadata(msg.u.snapshot_channel.key, | |
1497 | msg.u.snapshot_channel.pathname, | |
1498 | msg.u.snapshot_channel.relayd_id, | |
1499 | ctx); | |
1500 | if (ret < 0) { | |
1501 | ERR("Snapshot metadata failed"); | |
1502 | ret_code = LTTNG_ERR_UST_META_FAIL; | |
1503 | } | |
1504 | } else { | |
1505 | ret = snapshot_channel(msg.u.snapshot_channel.key, | |
1506 | msg.u.snapshot_channel.pathname, | |
1507 | msg.u.snapshot_channel.relayd_id, | |
5c786ded | 1508 | msg.u.snapshot_channel.max_stream_size, |
10a50311 JD |
1509 | ctx); |
1510 | if (ret < 0) { | |
1511 | ERR("Snapshot channel failed"); | |
1512 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; | |
1513 | } | |
1514 | } | |
1515 | ||
9ce5646a | 1516 | health_code_update(); |
6dc3064a DG |
1517 | ret = consumer_send_status_msg(sock, ret_code); |
1518 | if (ret < 0) { | |
1519 | /* Somehow, the session daemon is not responding anymore. */ | |
1520 | goto end_nosignal; | |
1521 | } | |
9ce5646a | 1522 | health_code_update(); |
6dc3064a DG |
1523 | break; |
1524 | } | |
3bd1e081 MD |
1525 | default: |
1526 | break; | |
1527 | } | |
3f8e211f | 1528 | |
3bd1e081 | 1529 | end_nosignal: |
b0b335c8 | 1530 | rcu_read_unlock(); |
4cbc1a04 | 1531 | |
9ce5646a MD |
1532 | health_code_update(); |
1533 | ||
4cbc1a04 DG |
1534 | /* |
1535 | * Return 1 to indicate success since the 0 value can be a socket | |
1536 | * shutdown during the recv() or send() call. | |
1537 | */ | |
1538 | return 1; | |
ffe60014 DG |
1539 | |
1540 | end_msg_sessiond: | |
1541 | /* | |
1542 | * The returned value here is not useful since either way we'll return 1 to | |
1543 | * the caller because the session daemon socket management is done | |
1544 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. | |
1545 | */ | |
489f70e9 MD |
1546 | ret = consumer_send_status_msg(sock, ret_code); |
1547 | if (ret < 0) { | |
1548 | goto error_fatal; | |
1549 | } | |
ffe60014 | 1550 | rcu_read_unlock(); |
9ce5646a MD |
1551 | |
1552 | health_code_update(); | |
1553 | ||
ffe60014 DG |
1554 | return 1; |
1555 | end_channel_error: | |
1556 | if (channel) { | |
1557 | /* | |
1558 | * Free channel here since no one has a reference to it. We don't | |
1559 | * free after that because a stream can store this pointer. | |
1560 | */ | |
1561 | destroy_channel(channel); | |
1562 | } | |
1563 | /* We have to send a status channel message indicating an error. */ | |
1564 | ret = consumer_send_status_channel(sock, NULL); | |
1565 | if (ret < 0) { | |
1566 | /* Stop everything if session daemon can not be notified. */ | |
1567 | goto error_fatal; | |
1568 | } | |
1569 | rcu_read_unlock(); | |
9ce5646a MD |
1570 | |
1571 | health_code_update(); | |
1572 | ||
ffe60014 DG |
1573 | return 1; |
1574 | error_fatal: | |
1575 | rcu_read_unlock(); | |
1576 | /* This will issue a consumer stop. */ | |
1577 | return -1; | |
3bd1e081 MD |
1578 | } |
1579 | ||
ffe60014 DG |
1580 | /* |
1581 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1582 | * compiled out, we isolate it in this library. | |
1583 | */ | |
1584 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, | |
1585 | unsigned long *off) | |
3bd1e081 | 1586 | { |
ffe60014 DG |
1587 | assert(stream); |
1588 | assert(stream->ustream); | |
b5c5fc29 | 1589 | |
ffe60014 | 1590 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
3bd1e081 MD |
1591 | } |
1592 | ||
ffe60014 DG |
1593 | /* |
1594 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be | |
1595 | * compiled out, we isolate it in this library. | |
1596 | */ | |
1597 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) | |
d056b477 | 1598 | { |
ffe60014 DG |
1599 | assert(stream); |
1600 | assert(stream->ustream); | |
1601 | ||
1602 | return ustctl_get_mmap_base(stream->ustream); | |
d056b477 MD |
1603 | } |
1604 | ||
ffe60014 DG |
1605 | /* |
1606 | * Take a snapshot for a specific fd | |
1607 | * | |
1608 | * Returns 0 on success, < 0 on error | |
1609 | */ | |
1610 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) | |
3bd1e081 | 1611 | { |
ffe60014 DG |
1612 | assert(stream); |
1613 | assert(stream->ustream); | |
1614 | ||
1615 | return ustctl_snapshot(stream->ustream); | |
3bd1e081 MD |
1616 | } |
1617 | ||
ffe60014 DG |
1618 | /* |
1619 | * Get the produced position | |
1620 | * | |
1621 | * Returns 0 on success, < 0 on error | |
1622 | */ | |
1623 | int lttng_ustconsumer_get_produced_snapshot( | |
1624 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
3bd1e081 | 1625 | { |
ffe60014 DG |
1626 | assert(stream); |
1627 | assert(stream->ustream); | |
1628 | assert(pos); | |
7a57cf92 | 1629 | |
ffe60014 DG |
1630 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
1631 | } | |
7a57cf92 | 1632 | |
10a50311 JD |
1633 | /* |
1634 | * Get the consumed position | |
1635 | * | |
1636 | * Returns 0 on success, < 0 on error | |
1637 | */ | |
1638 | int lttng_ustconsumer_get_consumed_snapshot( | |
1639 | struct lttng_consumer_stream *stream, unsigned long *pos) | |
1640 | { | |
1641 | assert(stream); | |
1642 | assert(stream->ustream); | |
1643 | assert(pos); | |
1644 | ||
1645 | return ustctl_snapshot_get_consumed(stream->ustream, pos); | |
1646 | } | |
1647 | ||
84a182ce DG |
1648 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
1649 | int producer) | |
1650 | { | |
1651 | assert(stream); | |
1652 | assert(stream->ustream); | |
1653 | ||
1654 | ustctl_flush_buffer(stream->ustream, producer); | |
1655 | } | |
1656 | ||
1657 | int lttng_ustconsumer_get_current_timestamp( | |
1658 | struct lttng_consumer_stream *stream, uint64_t *ts) | |
1659 | { | |
1660 | assert(stream); | |
1661 | assert(stream->ustream); | |
1662 | assert(ts); | |
1663 | ||
1664 | return ustctl_get_current_timestamp(stream->ustream, ts); | |
1665 | } | |
1666 | ||
ffe60014 DG |
1667 | /* |
1668 | * Called when the stream signal the consumer that it has hang up. | |
1669 | */ | |
1670 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) | |
1671 | { | |
1672 | assert(stream); | |
1673 | assert(stream->ustream); | |
2c1dd183 | 1674 | |
ffe60014 DG |
1675 | ustctl_flush_buffer(stream->ustream, 0); |
1676 | stream->hangup_flush_done = 1; | |
1677 | } | |
ee77a7b0 | 1678 | |
ffe60014 DG |
1679 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
1680 | { | |
1681 | assert(chan); | |
1682 | assert(chan->uchan); | |
e316aad5 | 1683 | |
ea88ca2a MD |
1684 | if (chan->switch_timer_enabled == 1) { |
1685 | consumer_timer_switch_stop(chan); | |
1686 | } | |
1687 | consumer_metadata_cache_destroy(chan); | |
ffe60014 | 1688 | ustctl_destroy_channel(chan->uchan); |
3bd1e081 MD |
1689 | } |
1690 | ||
1691 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) | |
1692 | { | |
ffe60014 DG |
1693 | assert(stream); |
1694 | assert(stream->ustream); | |
d41f73b7 | 1695 | |
ea88ca2a MD |
1696 | if (stream->chan->switch_timer_enabled == 1) { |
1697 | consumer_timer_switch_stop(stream->chan); | |
1698 | } | |
ffe60014 DG |
1699 | ustctl_destroy_stream(stream->ustream); |
1700 | } | |
d41f73b7 | 1701 | |
309167d2 JD |
1702 | /* |
1703 | * Populate index values of a UST stream. Values are set in big endian order. | |
1704 | * | |
1705 | * Return 0 on success or else a negative value. | |
1706 | */ | |
1707 | static int get_index_values(struct lttng_packet_index *index, | |
1708 | struct ustctl_consumer_stream *ustream) | |
1709 | { | |
1710 | int ret; | |
1711 | ||
1712 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); | |
1713 | if (ret < 0) { | |
1714 | PERROR("ustctl_get_timestamp_begin"); | |
1715 | goto error; | |
1716 | } | |
1717 | index->timestamp_begin = htobe64(index->timestamp_begin); | |
1718 | ||
1719 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); | |
1720 | if (ret < 0) { | |
1721 | PERROR("ustctl_get_timestamp_end"); | |
1722 | goto error; | |
1723 | } | |
1724 | index->timestamp_end = htobe64(index->timestamp_end); | |
1725 | ||
1726 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); | |
1727 | if (ret < 0) { | |
1728 | PERROR("ustctl_get_events_discarded"); | |
1729 | goto error; | |
1730 | } | |
1731 | index->events_discarded = htobe64(index->events_discarded); | |
1732 | ||
1733 | ret = ustctl_get_content_size(ustream, &index->content_size); | |
1734 | if (ret < 0) { | |
1735 | PERROR("ustctl_get_content_size"); | |
1736 | goto error; | |
1737 | } | |
1738 | index->content_size = htobe64(index->content_size); | |
1739 | ||
1740 | ret = ustctl_get_packet_size(ustream, &index->packet_size); | |
1741 | if (ret < 0) { | |
1742 | PERROR("ustctl_get_packet_size"); | |
1743 | goto error; | |
1744 | } | |
1745 | index->packet_size = htobe64(index->packet_size); | |
1746 | ||
1747 | ret = ustctl_get_stream_id(ustream, &index->stream_id); | |
1748 | if (ret < 0) { | |
1749 | PERROR("ustctl_get_stream_id"); | |
1750 | goto error; | |
1751 | } | |
1752 | index->stream_id = htobe64(index->stream_id); | |
1753 | ||
1754 | error: | |
1755 | return ret; | |
1756 | } | |
1757 | ||
94d49140 JD |
1758 | /* |
1759 | * Write up to one packet from the metadata cache to the channel. | |
1760 | * | |
1761 | * Returns the number of bytes pushed in the cache, or a negative value | |
1762 | * on error. | |
1763 | */ | |
1764 | static | |
1765 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) | |
1766 | { | |
1767 | ssize_t write_len; | |
1768 | int ret; | |
1769 | ||
1770 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); | |
1771 | if (stream->chan->metadata_cache->contiguous | |
1772 | == stream->ust_metadata_pushed) { | |
1773 | ret = 0; | |
1774 | goto end; | |
1775 | } | |
1776 | ||
1777 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, | |
1778 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], | |
1779 | stream->chan->metadata_cache->contiguous | |
1780 | - stream->ust_metadata_pushed); | |
1781 | assert(write_len != 0); | |
1782 | if (write_len < 0) { | |
1783 | ERR("Writing one metadata packet"); | |
1784 | ret = -1; | |
1785 | goto end; | |
1786 | } | |
1787 | stream->ust_metadata_pushed += write_len; | |
1788 | ||
1789 | assert(stream->chan->metadata_cache->contiguous >= | |
1790 | stream->ust_metadata_pushed); | |
1791 | ret = write_len; | |
1792 | ||
1793 | end: | |
1794 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); | |
1795 | return ret; | |
1796 | } | |
1797 | ||
309167d2 | 1798 | |
94d49140 JD |
1799 | /* |
1800 | * Sync metadata meaning request them to the session daemon and snapshot to the | |
1801 | * metadata thread can consumer them. | |
1802 | * | |
1803 | * Metadata stream lock MUST be acquired. | |
1804 | * | |
1805 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream | |
1806 | * is empty or a negative value on error. | |
1807 | */ | |
1808 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, | |
1809 | struct lttng_consumer_stream *metadata) | |
1810 | { | |
1811 | int ret; | |
1812 | int retry = 0; | |
1813 | ||
1814 | assert(ctx); | |
1815 | assert(metadata); | |
1816 | ||
1817 | /* | |
1818 | * Request metadata from the sessiond, but don't wait for the flush | |
1819 | * because we locked the metadata thread. | |
1820 | */ | |
1821 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); | |
1822 | if (ret < 0) { | |
1823 | goto end; | |
1824 | } | |
1825 | ||
1826 | ret = commit_one_metadata_packet(metadata); | |
1827 | if (ret <= 0) { | |
1828 | goto end; | |
1829 | } else if (ret > 0) { | |
1830 | retry = 1; | |
1831 | } | |
1832 | ||
1833 | ustctl_flush_buffer(metadata->ustream, 1); | |
1834 | ret = ustctl_snapshot(metadata->ustream); | |
1835 | if (ret < 0) { | |
1836 | if (errno != EAGAIN) { | |
1837 | ERR("Sync metadata, taking UST snapshot"); | |
1838 | goto end; | |
1839 | } | |
1840 | DBG("No new metadata when syncing them."); | |
1841 | /* No new metadata, exit. */ | |
1842 | ret = ENODATA; | |
1843 | goto end; | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * After this flush, we still need to extract metadata. | |
1848 | */ | |
1849 | if (retry) { | |
1850 | ret = EAGAIN; | |
1851 | } | |
1852 | ||
1853 | end: | |
1854 | return ret; | |
1855 | } | |
1856 | ||
1857 | /* | |
1858 | * Read subbuffer from the given stream. | |
1859 | * | |
1860 | * Stream lock MUST be acquired. | |
1861 | * | |
1862 | * Return 0 on success else a negative value. | |
1863 | */ | |
d41f73b7 MD |
1864 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
1865 | struct lttng_consumer_local_data *ctx) | |
1866 | { | |
1d4dfdef | 1867 | unsigned long len, subbuf_size, padding; |
1c20f0e2 | 1868 | int err, write_index = 1; |
d41f73b7 | 1869 | long ret = 0; |
d41f73b7 | 1870 | char dummy; |
ffe60014 | 1871 | struct ustctl_consumer_stream *ustream; |
309167d2 | 1872 | struct lttng_packet_index index; |
ffe60014 DG |
1873 | |
1874 | assert(stream); | |
1875 | assert(stream->ustream); | |
1876 | assert(ctx); | |
d41f73b7 | 1877 | |
3eb914c0 | 1878 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
ffe60014 DG |
1879 | stream->name); |
1880 | ||
1881 | /* Ease our life for what's next. */ | |
1882 | ustream = stream->ustream; | |
d41f73b7 | 1883 | |
6cd525e8 MD |
1884 | /* |
1885 | * We can consume the 1 byte written into the wait_fd by UST. | |
1886 | * Don't trigger error if we cannot read this one byte (read | |
1887 | * returns 0), or if the error is EAGAIN or EWOULDBLOCK. | |
1888 | */ | |
04ef1097 | 1889 | if (stream->monitor && !stream->hangup_flush_done) { |
c617c0c6 MD |
1890 | ssize_t readlen; |
1891 | ||
6cd525e8 MD |
1892 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
1893 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | |
effcf122 MD |
1894 | ret = readlen; |
1895 | goto end; | |
1896 | } | |
d41f73b7 MD |
1897 | } |
1898 | ||
04ef1097 | 1899 | retry: |
d41f73b7 | 1900 | /* Get the next subbuffer */ |
ffe60014 | 1901 | err = ustctl_get_next_subbuf(ustream); |
d41f73b7 | 1902 | if (err != 0) { |
04ef1097 MD |
1903 | /* |
1904 | * Populate metadata info if the existing info has | |
1905 | * already been read. | |
1906 | */ | |
1907 | if (stream->metadata_flag) { | |
94d49140 JD |
1908 | ret = commit_one_metadata_packet(stream); |
1909 | if (ret <= 0) { | |
04ef1097 MD |
1910 | goto end; |
1911 | } | |
04ef1097 MD |
1912 | ustctl_flush_buffer(stream->ustream, 1); |
1913 | goto retry; | |
1914 | } | |
1915 | ||
1d4dfdef | 1916 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
d41f73b7 MD |
1917 | /* |
1918 | * This is a debug message even for single-threaded consumer, | |
1919 | * because poll() have more relaxed criterions than get subbuf, | |
1920 | * so get_subbuf may fail for short race windows where poll() | |
1921 | * would issue wakeups. | |
1922 | */ | |
1923 | DBG("Reserving sub buffer failed (everything is normal, " | |
ffe60014 | 1924 | "it is due to concurrency) [ret: %d]", err); |
d41f73b7 MD |
1925 | goto end; |
1926 | } | |
ffe60014 | 1927 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
309167d2 | 1928 | |
1c20f0e2 | 1929 | if (!stream->metadata_flag) { |
309167d2 JD |
1930 | index.offset = htobe64(stream->out_fd_offset); |
1931 | ret = get_index_values(&index, ustream); | |
1932 | if (ret < 0) { | |
1933 | goto end; | |
1934 | } | |
1c20f0e2 JD |
1935 | } else { |
1936 | write_index = 0; | |
309167d2 JD |
1937 | } |
1938 | ||
1d4dfdef | 1939 | /* Get the full padded subbuffer size */ |
ffe60014 | 1940 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
effcf122 | 1941 | assert(err == 0); |
1d4dfdef DG |
1942 | |
1943 | /* Get subbuffer data size (without padding) */ | |
ffe60014 | 1944 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
1d4dfdef DG |
1945 | assert(err == 0); |
1946 | ||
1947 | /* Make sure we don't get a subbuffer size bigger than the padded */ | |
1948 | assert(len >= subbuf_size); | |
1949 | ||
1950 | padding = len - subbuf_size; | |
d41f73b7 | 1951 | /* write the subbuffer to the tracefile */ |
309167d2 | 1952 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
91dfef6e DG |
1953 | /* |
1954 | * The mmap operation should write subbuf_size amount of data when network | |
1955 | * streaming or the full padding (len) size when we are _not_ streaming. | |
1956 | */ | |
d88aee68 DG |
1957 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
1958 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { | |
d41f73b7 | 1959 | /* |
91dfef6e | 1960 | * Display the error but continue processing to try to release the |
c5c45efa DG |
1961 | * subbuffer. This is a DBG statement since any unexpected kill or |
1962 | * signal, the application gets unregistered, relayd gets closed or | |
1963 | * anything that affects the buffer lifetime will trigger this error. | |
1964 | * So, for the sake of the user, don't print this error since it can | |
1965 | * happen and it is OK with the code flow. | |
d41f73b7 | 1966 | */ |
c5c45efa | 1967 | DBG("Error writing to tracefile " |
8fd623e0 | 1968 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
91dfef6e | 1969 | ret, len, subbuf_size); |
309167d2 | 1970 | write_index = 0; |
d41f73b7 | 1971 | } |
ffe60014 | 1972 | err = ustctl_put_next_subbuf(ustream); |
effcf122 | 1973 | assert(err == 0); |
331744e3 | 1974 | |
309167d2 | 1975 | /* Write index if needed. */ |
1c20f0e2 JD |
1976 | if (!write_index) { |
1977 | goto end; | |
1978 | } | |
1979 | ||
94d49140 JD |
1980 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
1981 | /* | |
1982 | * In live, block until all the metadata is sent. | |
1983 | */ | |
1984 | err = consumer_stream_sync_metadata(ctx, stream->session_id); | |
1985 | if (err < 0) { | |
1986 | goto end; | |
1987 | } | |
1988 | } | |
1989 | ||
1c20f0e2 JD |
1990 | assert(!stream->metadata_flag); |
1991 | err = consumer_stream_write_index(stream, &index); | |
1992 | if (err < 0) { | |
1993 | goto end; | |
309167d2 JD |
1994 | } |
1995 | ||
d41f73b7 MD |
1996 | end: |
1997 | return ret; | |
1998 | } | |
1999 | ||
ffe60014 DG |
2000 | /* |
2001 | * Called when a stream is created. | |
fe4477ee JD |
2002 | * |
2003 | * Return 0 on success or else a negative value. | |
ffe60014 | 2004 | */ |
d41f73b7 MD |
2005 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
2006 | { | |
fe4477ee JD |
2007 | int ret; |
2008 | ||
10a50311 JD |
2009 | assert(stream); |
2010 | ||
fe4477ee | 2011 | /* Don't create anything if this is set for streaming. */ |
10a50311 | 2012 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
fe4477ee JD |
2013 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
2014 | stream->chan->tracefile_size, stream->tracefile_count_current, | |
309167d2 | 2015 | stream->uid, stream->gid, NULL); |
fe4477ee JD |
2016 | if (ret < 0) { |
2017 | goto error; | |
2018 | } | |
2019 | stream->out_fd = ret; | |
2020 | stream->tracefile_size_current = 0; | |
309167d2 JD |
2021 | |
2022 | if (!stream->metadata_flag) { | |
2023 | ret = index_create_file(stream->chan->pathname, | |
2024 | stream->name, stream->uid, stream->gid, | |
2025 | stream->chan->tracefile_size, | |
2026 | stream->tracefile_count_current); | |
2027 | if (ret < 0) { | |
2028 | goto error; | |
2029 | } | |
2030 | stream->index_fd = ret; | |
2031 | } | |
fe4477ee JD |
2032 | } |
2033 | ret = 0; | |
2034 | ||
2035 | error: | |
2036 | return ret; | |
d41f73b7 | 2037 | } |
ca22feea DG |
2038 | |
2039 | /* | |
2040 | * Check if data is still being extracted from the buffers for a specific | |
4e9a4686 DG |
2041 | * stream. Consumer data lock MUST be acquired before calling this function |
2042 | * and the stream lock. | |
ca22feea | 2043 | * |
6d805429 | 2044 | * Return 1 if the traced data are still getting read else 0 meaning that the |
ca22feea DG |
2045 | * data is available for trace viewer reading. |
2046 | */ | |
6d805429 | 2047 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
ca22feea DG |
2048 | { |
2049 | int ret; | |
2050 | ||
2051 | assert(stream); | |
ffe60014 | 2052 | assert(stream->ustream); |
ca22feea | 2053 | |
6d805429 | 2054 | DBG("UST consumer checking data pending"); |
c8f59ee5 | 2055 | |
ca6b395f MD |
2056 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
2057 | ret = 0; | |
2058 | goto end; | |
2059 | } | |
2060 | ||
04ef1097 | 2061 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
e6ee4eab DG |
2062 | uint64_t contiguous, pushed; |
2063 | ||
2064 | /* Ease our life a bit. */ | |
2065 | contiguous = stream->chan->metadata_cache->contiguous; | |
2066 | pushed = stream->ust_metadata_pushed; | |
2067 | ||
04ef1097 MD |
2068 | /* |
2069 | * We can simply check whether all contiguously available data | |
2070 | * has been pushed to the ring buffer, since the push operation | |
2071 | * is performed within get_next_subbuf(), and because both | |
2072 | * get_next_subbuf() and put_next_subbuf() are issued atomically | |
2073 | * thanks to the stream lock within | |
2074 | * lttng_ustconsumer_read_subbuffer(). This basically means that | |
2075 | * whetnever ust_metadata_pushed is incremented, the associated | |
2076 | * metadata has been consumed from the metadata stream. | |
2077 | */ | |
2078 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, | |
e6ee4eab | 2079 | contiguous, pushed); |
6acdf328 | 2080 | assert(((int64_t) contiguous - pushed) >= 0); |
e6ee4eab | 2081 | if ((contiguous != pushed) || |
6acdf328 | 2082 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
04ef1097 MD |
2083 | ret = 1; /* Data is pending */ |
2084 | goto end; | |
2085 | } | |
2086 | } else { | |
2087 | ret = ustctl_get_next_subbuf(stream->ustream); | |
2088 | if (ret == 0) { | |
2089 | /* | |
2090 | * There is still data so let's put back this | |
2091 | * subbuffer. | |
2092 | */ | |
2093 | ret = ustctl_put_subbuf(stream->ustream); | |
2094 | assert(ret == 0); | |
2095 | ret = 1; /* Data is pending */ | |
2096 | goto end; | |
2097 | } | |
ca22feea DG |
2098 | } |
2099 | ||
6d805429 DG |
2100 | /* Data is NOT pending so ready to be read. */ |
2101 | ret = 0; | |
ca22feea | 2102 | |
6efae65e DG |
2103 | end: |
2104 | return ret; | |
ca22feea | 2105 | } |
d88aee68 DG |
2106 | |
2107 | /* | |
2108 | * Close every metadata stream wait fd of the metadata hash table. This | |
2109 | * function MUST be used very carefully so not to run into a race between the | |
2110 | * metadata thread handling streams and this function closing their wait fd. | |
2111 | * | |
2112 | * For UST, this is used when the session daemon hangs up. Its the metadata | |
2113 | * producer so calling this is safe because we are assured that no state change | |
2114 | * can occur in the metadata thread for the streams in the hash table. | |
2115 | */ | |
2116 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) | |
2117 | { | |
d88aee68 DG |
2118 | struct lttng_ht_iter iter; |
2119 | struct lttng_consumer_stream *stream; | |
2120 | ||
2121 | assert(metadata_ht); | |
2122 | assert(metadata_ht->ht); | |
2123 | ||
2124 | DBG("UST consumer closing all metadata streams"); | |
2125 | ||
2126 | rcu_read_lock(); | |
2127 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, | |
2128 | node.node) { | |
9ce5646a MD |
2129 | |
2130 | health_code_update(); | |
2131 | ||
be2b50c7 | 2132 | pthread_mutex_lock(&stream->chan->lock); |
d88aee68 | 2133 | /* |
be2b50c7 DG |
2134 | * Whatever returned value, we must continue to try to close everything |
2135 | * so ignore it. | |
d88aee68 | 2136 | */ |
be2b50c7 DG |
2137 | (void) _close_metadata(stream->chan); |
2138 | DBG("Metadata wait fd %d and poll pipe fd %d closed", stream->wait_fd, | |
2139 | stream->ust_metadata_poll_pipe[1]); | |
2140 | pthread_mutex_unlock(&stream->chan->lock); | |
2141 | ||
d88aee68 DG |
2142 | } |
2143 | rcu_read_unlock(); | |
2144 | } | |
d8ef542d MD |
2145 | |
2146 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) | |
2147 | { | |
2148 | int ret; | |
2149 | ||
2150 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); | |
2151 | if (ret < 0) { | |
2152 | ERR("Unable to close wakeup fd"); | |
2153 | } | |
2154 | } | |
331744e3 | 2155 | |
f666ae70 MD |
2156 | /* |
2157 | * Please refer to consumer-timer.c before adding any lock within this | |
2158 | * function or any of its callees. Timers have a very strict locking | |
2159 | * semantic with respect to teardown. Failure to respect this semantic | |
2160 | * introduces deadlocks. | |
2161 | */ | |
331744e3 | 2162 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
94d49140 | 2163 | struct lttng_consumer_channel *channel, int timer, int wait) |
331744e3 JD |
2164 | { |
2165 | struct lttcomm_metadata_request_msg request; | |
2166 | struct lttcomm_consumer_msg msg; | |
2167 | enum lttng_error_code ret_code = LTTNG_OK; | |
2168 | uint64_t len, key, offset; | |
2169 | int ret; | |
2170 | ||
2171 | assert(channel); | |
2172 | assert(channel->metadata_cache); | |
2173 | ||
2174 | /* send the metadata request to sessiond */ | |
2175 | switch (consumer_data.type) { | |
2176 | case LTTNG_CONSUMER64_UST: | |
2177 | request.bits_per_long = 64; | |
2178 | break; | |
2179 | case LTTNG_CONSUMER32_UST: | |
2180 | request.bits_per_long = 32; | |
2181 | break; | |
2182 | default: | |
2183 | request.bits_per_long = 0; | |
2184 | break; | |
2185 | } | |
2186 | ||
2187 | request.session_id = channel->session_id; | |
1950109e | 2188 | request.session_id_per_pid = channel->session_id_per_pid; |
567eb353 DG |
2189 | /* |
2190 | * Request the application UID here so the metadata of that application can | |
2191 | * be sent back. The channel UID corresponds to the user UID of the session | |
2192 | * used for the rights on the stream file(s). | |
2193 | */ | |
2194 | request.uid = channel->ust_app_uid; | |
331744e3 | 2195 | request.key = channel->key; |
567eb353 | 2196 | |
1950109e | 2197 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
567eb353 DG |
2198 | ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64, |
2199 | request.session_id, request.session_id_per_pid, request.uid, | |
2200 | request.key); | |
331744e3 | 2201 | |
75d83e50 | 2202 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
9ce5646a MD |
2203 | |
2204 | health_code_update(); | |
2205 | ||
331744e3 JD |
2206 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
2207 | sizeof(request)); | |
2208 | if (ret < 0) { | |
2209 | ERR("Asking metadata to sessiond"); | |
2210 | goto end; | |
2211 | } | |
2212 | ||
9ce5646a MD |
2213 | health_code_update(); |
2214 | ||
331744e3 JD |
2215 | /* Receive the metadata from sessiond */ |
2216 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, | |
2217 | sizeof(msg)); | |
2218 | if (ret != sizeof(msg)) { | |
8fd623e0 | 2219 | DBG("Consumer received unexpected message size %d (expects %zu)", |
331744e3 JD |
2220 | ret, sizeof(msg)); |
2221 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); | |
2222 | /* | |
2223 | * The ret value might 0 meaning an orderly shutdown but this is ok | |
2224 | * since the caller handles this. | |
2225 | */ | |
2226 | goto end; | |
2227 | } | |
2228 | ||
9ce5646a MD |
2229 | health_code_update(); |
2230 | ||
331744e3 JD |
2231 | if (msg.cmd_type == LTTNG_ERR_UND) { |
2232 | /* No registry found */ | |
2233 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2234 | ret_code); | |
2235 | ret = 0; | |
2236 | goto end; | |
2237 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { | |
2238 | ERR("Unexpected cmd_type received %d", msg.cmd_type); | |
2239 | ret = -1; | |
2240 | goto end; | |
2241 | } | |
2242 | ||
2243 | len = msg.u.push_metadata.len; | |
2244 | key = msg.u.push_metadata.key; | |
2245 | offset = msg.u.push_metadata.target_offset; | |
2246 | ||
2247 | assert(key == channel->key); | |
2248 | if (len == 0) { | |
2249 | DBG("No new metadata to receive for key %" PRIu64, key); | |
2250 | } | |
2251 | ||
9ce5646a MD |
2252 | health_code_update(); |
2253 | ||
331744e3 JD |
2254 | /* Tell session daemon we are ready to receive the metadata. */ |
2255 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, | |
2256 | LTTNG_OK); | |
2257 | if (ret < 0 || len == 0) { | |
2258 | /* | |
2259 | * Somehow, the session daemon is not responding anymore or there is | |
2260 | * nothing to receive. | |
2261 | */ | |
2262 | goto end; | |
2263 | } | |
2264 | ||
9ce5646a MD |
2265 | health_code_update(); |
2266 | ||
331744e3 | 2267 | ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
94d49140 | 2268 | key, offset, len, channel, timer, wait); |
f2a444f1 DG |
2269 | if (ret_code >= 0) { |
2270 | /* | |
2271 | * Only send the status msg if the sessiond is alive meaning a positive | |
2272 | * ret code. | |
2273 | */ | |
2274 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code); | |
2275 | } | |
331744e3 JD |
2276 | ret = 0; |
2277 | ||
2278 | end: | |
9ce5646a MD |
2279 | health_code_update(); |
2280 | ||
75d83e50 | 2281 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
331744e3 JD |
2282 | return ret; |
2283 | } |