Fix: add missing goto error in UST consumer
[lttng-tools.git] / src / common / ust-consumer / ust-consumer.c
1 /*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
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.
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 *
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.
17 */
18
19 #define _GNU_SOURCE
20 #include <assert.h>
21 #include <lttng/ust-ctl.h>
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>
28 #include <sys/stat.h>
29 #include <sys/types.h>
30 #include <inttypes.h>
31 #include <unistd.h>
32 #include <urcu/list.h>
33 #include <signal.h>
34
35 #include <common/common.h>
36 #include <common/sessiond-comm/sessiond-comm.h>
37 #include <common/relayd/relayd.h>
38 #include <common/compat/fcntl.h>
39 #include <common/consumer-metadata-cache.h>
40 #include <common/consumer-timer.h>
41 #include <common/utils.h>
42
43 #include "ust-consumer.h"
44
45 extern struct lttng_consumer_global_data consumer_data;
46 extern int consumer_poll_timeout;
47 extern volatile int consumer_quit;
48
49 /*
50 * Free channel object and all streams associated with it. This MUST be used
51 * only and only if the channel has _NEVER_ been added to the global channel
52 * hash table.
53 */
54 static void destroy_channel(struct lttng_consumer_channel *channel)
55 {
56 struct lttng_consumer_stream *stream, *stmp;
57
58 assert(channel);
59
60 DBG("UST consumer cleaning stream list");
61
62 cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
63 send_node) {
64 cds_list_del(&stream->send_node);
65 ustctl_destroy_stream(stream->ustream);
66 free(stream);
67 }
68
69 /*
70 * If a channel is available meaning that was created before the streams
71 * were, delete it.
72 */
73 if (channel->uchan) {
74 lttng_ustconsumer_del_channel(channel);
75 }
76 free(channel);
77 }
78
79 /*
80 * Add channel to internal consumer state.
81 *
82 * Returns 0 on success or else a negative value.
83 */
84 static int add_channel(struct lttng_consumer_channel *channel,
85 struct lttng_consumer_local_data *ctx)
86 {
87 int ret = 0;
88
89 assert(channel);
90 assert(ctx);
91
92 if (ctx->on_recv_channel != NULL) {
93 ret = ctx->on_recv_channel(channel);
94 if (ret == 0) {
95 ret = consumer_add_channel(channel, ctx);
96 } else if (ret < 0) {
97 /* Most likely an ENOMEM. */
98 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
99 goto error;
100 }
101 } else {
102 ret = consumer_add_channel(channel, ctx);
103 }
104
105 DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key);
106
107 error:
108 return ret;
109 }
110
111 /*
112 * Allocate and return a consumer channel object.
113 */
114 static struct lttng_consumer_channel *allocate_channel(uint64_t session_id,
115 const char *pathname, const char *name, uid_t uid, gid_t gid,
116 int relayd_id, uint64_t key, enum lttng_event_output output,
117 uint64_t tracefile_size, uint64_t tracefile_count)
118 {
119 assert(pathname);
120 assert(name);
121
122 return consumer_allocate_channel(key, session_id, pathname, name, uid, gid,
123 relayd_id, output, tracefile_size, tracefile_count);
124 }
125
126 /*
127 * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the
128 * error value if applicable is set in it else it is kept untouched.
129 *
130 * Return NULL on error else the newly allocated stream object.
131 */
132 static struct lttng_consumer_stream *allocate_stream(int cpu, int key,
133 struct lttng_consumer_channel *channel,
134 struct lttng_consumer_local_data *ctx, int *_alloc_ret)
135 {
136 int alloc_ret;
137 struct lttng_consumer_stream *stream = NULL;
138
139 assert(channel);
140 assert(ctx);
141
142 stream = consumer_allocate_stream(channel->key,
143 key,
144 LTTNG_CONSUMER_ACTIVE_STREAM,
145 channel->name,
146 channel->uid,
147 channel->gid,
148 channel->relayd_id,
149 channel->session_id,
150 cpu,
151 &alloc_ret,
152 channel->type);
153 if (stream == NULL) {
154 switch (alloc_ret) {
155 case -ENOENT:
156 /*
157 * We could not find the channel. Can happen if cpu hotplug
158 * happens while tearing down.
159 */
160 DBG3("Could not find channel");
161 break;
162 case -ENOMEM:
163 case -EINVAL:
164 default:
165 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
166 break;
167 }
168 goto error;
169 }
170
171 stream->chan = channel;
172
173 error:
174 if (_alloc_ret) {
175 *_alloc_ret = alloc_ret;
176 }
177 return stream;
178 }
179
180 /*
181 * Send the given stream pointer to the corresponding thread.
182 *
183 * Returns 0 on success else a negative value.
184 */
185 static int send_stream_to_thread(struct lttng_consumer_stream *stream,
186 struct lttng_consumer_local_data *ctx)
187 {
188 int ret, stream_pipe;
189
190 /* Get the right pipe where the stream will be sent. */
191 if (stream->metadata_flag) {
192 stream_pipe = ctx->consumer_metadata_pipe[1];
193 } else {
194 stream_pipe = ctx->consumer_data_pipe[1];
195 }
196
197 do {
198 ret = write(stream_pipe, &stream, sizeof(stream));
199 } while (ret < 0 && errno == EINTR);
200 if (ret < 0) {
201 PERROR("Consumer write %s stream to pipe %d",
202 stream->metadata_flag ? "metadata" : "data", stream_pipe);
203 }
204
205 return ret;
206 }
207
208 /*
209 * Search for a relayd object related to the stream. If found, send the stream
210 * to the relayd.
211 *
212 * On success, returns 0 else a negative value.
213 */
214 static int send_stream_to_relayd(struct lttng_consumer_stream *stream)
215 {
216 int ret = 0;
217 struct consumer_relayd_sock_pair *relayd;
218
219 assert(stream);
220
221 relayd = consumer_find_relayd(stream->net_seq_idx);
222 if (relayd != NULL) {
223 pthread_mutex_lock(&relayd->ctrl_sock_mutex);
224 /* Add stream on the relayd */
225 ret = relayd_add_stream(&relayd->control_sock, stream->name,
226 stream->chan->pathname, &stream->relayd_stream_id,
227 stream->chan->tracefile_size,
228 stream->chan->tracefile_count);
229 pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
230 if (ret < 0) {
231 goto error;
232 }
233 } else if (stream->net_seq_idx != (uint64_t) -1ULL) {
234 ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.",
235 stream->net_seq_idx);
236 ret = -1;
237 goto error;
238 }
239
240 error:
241 return ret;
242 }
243
244 /*
245 * Create streams for the given channel using liblttng-ust-ctl.
246 *
247 * Return 0 on success else a negative value.
248 */
249 static int create_ust_streams(struct lttng_consumer_channel *channel,
250 struct lttng_consumer_local_data *ctx)
251 {
252 int ret, cpu = 0;
253 struct ustctl_consumer_stream *ustream;
254 struct lttng_consumer_stream *stream;
255
256 assert(channel);
257 assert(ctx);
258
259 /*
260 * While a stream is available from ustctl. When NULL is returned, we've
261 * reached the end of the possible stream for the channel.
262 */
263 while ((ustream = ustctl_create_stream(channel->uchan, cpu))) {
264 int wait_fd;
265
266 wait_fd = ustctl_stream_get_wait_fd(ustream);
267
268 /* Allocate consumer stream object. */
269 stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret);
270 if (!stream) {
271 goto error_alloc;
272 }
273 stream->ustream = ustream;
274 /*
275 * Store it so we can save multiple function calls afterwards since
276 * this value is used heavily in the stream threads. This is UST
277 * specific so this is why it's done after allocation.
278 */
279 stream->wait_fd = wait_fd;
280
281 /*
282 * Order is important this is why a list is used. On error, the caller
283 * should clean this list.
284 */
285 cds_list_add_tail(&stream->send_node, &channel->streams.head);
286
287 ret = ustctl_get_max_subbuf_size(stream->ustream,
288 &stream->max_sb_size);
289 if (ret < 0) {
290 ERR("ustctl_get_max_subbuf_size failed for stream %s",
291 stream->name);
292 goto error;
293 }
294
295 /* Do actions once stream has been received. */
296 if (ctx->on_recv_stream) {
297 ret = ctx->on_recv_stream(stream);
298 if (ret < 0) {
299 goto error;
300 }
301 }
302
303 DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64,
304 stream->name, stream->key, stream->relayd_stream_id);
305
306 /* Set next CPU stream. */
307 channel->streams.count = ++cpu;
308
309 /* Keep stream reference when creating metadata. */
310 if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) {
311 channel->metadata_stream = stream;
312 }
313 }
314
315 return 0;
316
317 error:
318 error_alloc:
319 return ret;
320 }
321
322 /*
323 * Create an UST channel with the given attributes and send it to the session
324 * daemon using the ust ctl API.
325 *
326 * Return 0 on success or else a negative value.
327 */
328 static int create_ust_channel(struct ustctl_consumer_channel_attr *attr,
329 struct ustctl_consumer_channel **chanp)
330 {
331 int ret;
332 struct ustctl_consumer_channel *channel;
333
334 assert(attr);
335 assert(chanp);
336
337 DBG3("Creating channel to ustctl with attr: [overwrite: %d, "
338 "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", "
339 "switch_timer_interval: %u, read_timer_interval: %u, "
340 "output: %d, type: %d", attr->overwrite, attr->subbuf_size,
341 attr->num_subbuf, attr->switch_timer_interval,
342 attr->read_timer_interval, attr->output, attr->type);
343
344 channel = ustctl_create_channel(attr);
345 if (!channel) {
346 ret = -1;
347 goto error_create;
348 }
349
350 *chanp = channel;
351
352 return 0;
353
354 error_create:
355 return ret;
356 }
357
358 /*
359 * Send a single given stream to the session daemon using the sock.
360 *
361 * Return 0 on success else a negative value.
362 */
363 static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream)
364 {
365 int ret;
366
367 assert(stream);
368 assert(sock >= 0);
369
370 DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key);
371
372 /* Send stream to session daemon. */
373 ret = ustctl_send_stream_to_sessiond(sock, stream->ustream);
374 if (ret < 0) {
375 goto error;
376 }
377
378 error:
379 return ret;
380 }
381
382 /*
383 * Send channel to sessiond.
384 *
385 * Return 0 on success or else a negative value.
386 */
387 static int send_sessiond_channel(int sock,
388 struct lttng_consumer_channel *channel,
389 struct lttng_consumer_local_data *ctx, int *relayd_error)
390 {
391 int ret;
392 struct lttng_consumer_stream *stream;
393
394 assert(channel);
395 assert(ctx);
396 assert(sock >= 0);
397
398 DBG("UST consumer sending channel %s to sessiond", channel->name);
399
400 /* Send channel to sessiond. */
401 ret = ustctl_send_channel_to_sessiond(sock, channel->uchan);
402 if (ret < 0) {
403 goto error;
404 }
405
406 ret = ustctl_channel_close_wakeup_fd(channel->uchan);
407 if (ret < 0) {
408 goto error;
409 }
410
411 /* The channel was sent successfully to the sessiond at this point. */
412 cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
413 /* Try to send the stream to the relayd if one is available. */
414 ret = send_stream_to_relayd(stream);
415 if (ret < 0) {
416 /*
417 * Flag that the relayd was the problem here probably due to a
418 * communicaton error on the socket.
419 */
420 if (relayd_error) {
421 *relayd_error = 1;
422 }
423 goto error;
424 }
425
426 /* Send stream to session daemon. */
427 ret = send_sessiond_stream(sock, stream);
428 if (ret < 0) {
429 goto error;
430 }
431 }
432
433 /* Tell sessiond there is no more stream. */
434 ret = ustctl_send_stream_to_sessiond(sock, NULL);
435 if (ret < 0) {
436 goto error;
437 }
438
439 DBG("UST consumer NULL stream sent to sessiond");
440
441 return 0;
442
443 error:
444 return ret;
445 }
446
447 /*
448 * Creates a channel and streams and add the channel it to the channel internal
449 * state. The created stream must ONLY be sent once the GET_CHANNEL command is
450 * received.
451 *
452 * Return 0 on success or else, a negative value is returned and the channel
453 * MUST be destroyed by consumer_del_channel().
454 */
455 static int ask_channel(struct lttng_consumer_local_data *ctx, int sock,
456 struct lttng_consumer_channel *channel,
457 struct ustctl_consumer_channel_attr *attr)
458 {
459 int ret;
460
461 assert(ctx);
462 assert(channel);
463 assert(attr);
464
465 /*
466 * This value is still used by the kernel consumer since for the kernel,
467 * the stream ownership is not IN the consumer so we need to have the
468 * number of left stream that needs to be initialized so we can know when
469 * to delete the channel (see consumer.c).
470 *
471 * As for the user space tracer now, the consumer creates and sends the
472 * stream to the session daemon which only sends them to the application
473 * once every stream of a channel is received making this value useless
474 * because we they will be added to the poll thread before the application
475 * receives them. This ensures that a stream can not hang up during
476 * initilization of a channel.
477 */
478 channel->nb_init_stream_left = 0;
479
480 /* The reply msg status is handled in the following call. */
481 ret = create_ust_channel(attr, &channel->uchan);
482 if (ret < 0) {
483 goto error;
484 }
485
486 channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan);
487
488 if (ret < 0) {
489 goto error;
490 }
491
492 /* Open all streams for this channel. */
493 ret = create_ust_streams(channel, ctx);
494 if (ret < 0) {
495 goto error;
496 }
497
498 error:
499 return ret;
500 }
501
502 /*
503 * Send all stream of a channel to the right thread handling it.
504 *
505 * On error, return a negative value else 0 on success.
506 */
507 static int send_streams_to_thread(struct lttng_consumer_channel *channel,
508 struct lttng_consumer_local_data *ctx)
509 {
510 int ret = 0;
511 struct lttng_consumer_stream *stream, *stmp;
512
513 assert(channel);
514 assert(ctx);
515
516 /* Send streams to the corresponding thread. */
517 cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
518 send_node) {
519 /* Sending the stream to the thread. */
520 ret = send_stream_to_thread(stream, ctx);
521 if (ret < 0) {
522 /*
523 * If we are unable to send the stream to the thread, there is
524 * a big problem so just stop everything.
525 */
526 goto error;
527 }
528
529 /* Remove node from the channel stream list. */
530 cds_list_del(&stream->send_node);
531 }
532
533 error:
534 return ret;
535 }
536
537 /*
538 * Write metadata to the given channel using ustctl to convert the string to
539 * the ringbuffer.
540 * Called only from consumer_metadata_cache_write.
541 * The metadata cache lock MUST be acquired to write in the cache.
542 *
543 * Return 0 on success else a negative value.
544 */
545 int lttng_ustconsumer_push_metadata(struct lttng_consumer_channel *metadata,
546 const char *metadata_str, uint64_t target_offset, uint64_t len)
547 {
548 int ret;
549
550 assert(metadata);
551 assert(metadata_str);
552
553 DBG("UST consumer writing metadata to channel %s", metadata->name);
554
555 assert(target_offset <= metadata->metadata_cache->max_offset);
556 ret = ustctl_write_metadata_to_channel(metadata->uchan,
557 metadata_str + target_offset, len);
558 if (ret < 0) {
559 ERR("ustctl write metadata fail with ret %d, len %" PRIu64, ret, len);
560 goto error;
561 }
562
563 ustctl_flush_buffer(metadata->metadata_stream->ustream, 1);
564
565 error:
566 return ret;
567 }
568
569 /*
570 * Flush channel's streams using the given key to retrieve the channel.
571 *
572 * Return 0 on success else an LTTng error code.
573 */
574 static int flush_channel(uint64_t chan_key)
575 {
576 int ret = 0;
577 struct lttng_consumer_channel *channel;
578 struct lttng_consumer_stream *stream;
579 struct lttng_ht *ht;
580 struct lttng_ht_iter iter;
581
582 DBG("UST consumer flush channel key %" PRIu64, chan_key);
583
584 channel = consumer_find_channel(chan_key);
585 if (!channel) {
586 ERR("UST consumer flush channel %" PRIu64 " not found", chan_key);
587 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
588 goto error;
589 }
590
591 ht = consumer_data.stream_per_chan_id_ht;
592
593 /* For each stream of the channel id, flush it. */
594 rcu_read_lock();
595 cds_lfht_for_each_entry_duplicate(ht->ht,
596 ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct,
597 &channel->key, &iter.iter, stream, node_channel_id.node) {
598 ustctl_flush_buffer(stream->ustream, 1);
599 }
600 rcu_read_unlock();
601
602 error:
603 return ret;
604 }
605
606 /*
607 * Close metadata stream wakeup_fd using the given key to retrieve the channel.
608 *
609 * Return 0 on success else an LTTng error code.
610 */
611 static int close_metadata(uint64_t chan_key)
612 {
613 int ret;
614 struct lttng_consumer_channel *channel;
615
616 DBG("UST consumer close metadata key %" PRIu64, chan_key);
617
618 channel = consumer_find_channel(chan_key);
619 if (!channel) {
620 ERR("UST consumer close metadata %" PRIu64 " not found", chan_key);
621 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
622 goto error;
623 }
624
625 ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream);
626 if (ret < 0) {
627 ERR("UST consumer unable to close fd of metadata (ret: %d)", ret);
628 ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
629 goto error;
630 }
631 if (channel->switch_timer_enabled == 1) {
632 DBG("Deleting timer on metadata channel");
633 consumer_timer_switch_stop(channel);
634 }
635 consumer_metadata_cache_destroy(channel);
636
637 error:
638 return ret;
639 }
640
641 /*
642 * RCU read side lock MUST be acquired before calling this function.
643 *
644 * Return 0 on success else an LTTng error code.
645 */
646 static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key)
647 {
648 int ret;
649 struct lttng_consumer_channel *metadata;
650
651 DBG("UST consumer setup metadata key %" PRIu64, key);
652
653 metadata = consumer_find_channel(key);
654 if (!metadata) {
655 ERR("UST consumer push metadata %" PRIu64 " not found", key);
656 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
657 goto error;
658 }
659
660 /*
661 * Send metadata stream to relayd if one available. Availability is
662 * known if the stream is still in the list of the channel.
663 */
664 if (cds_list_empty(&metadata->streams.head)) {
665 ERR("Metadata channel key %" PRIu64 ", no stream available.", key);
666 ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
667 goto error;
668 }
669
670 /* Send metadata stream to relayd if needed. */
671 ret = send_stream_to_relayd(metadata->metadata_stream);
672 if (ret < 0) {
673 ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
674 goto error;
675 }
676
677 ret = send_streams_to_thread(metadata, ctx);
678 if (ret < 0) {
679 /*
680 * If we are unable to send the stream to the thread, there is
681 * a big problem so just stop everything.
682 */
683 ret = LTTCOMM_CONSUMERD_FATAL;
684 goto error;
685 }
686 /* List MUST be empty after or else it could be reused. */
687 assert(cds_list_empty(&metadata->streams.head));
688
689 ret = 0;
690
691 error:
692 return ret;
693 }
694
695 /*
696 * Receive the metadata updates from the sessiond.
697 */
698 int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset,
699 uint64_t len, struct lttng_consumer_channel *channel)
700 {
701 int ret, ret_code = LTTNG_OK;
702 char *metadata_str;
703
704 DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len);
705
706 metadata_str = zmalloc(len * sizeof(char));
707 if (!metadata_str) {
708 PERROR("zmalloc metadata string");
709 ret_code = LTTCOMM_CONSUMERD_ENOMEM;
710 goto end;
711 }
712
713 /* Receive metadata string. */
714 ret = lttcomm_recv_unix_sock(sock, metadata_str, len);
715 if (ret < 0) {
716 /* Session daemon is dead so return gracefully. */
717 ret_code = ret;
718 goto end_free;
719 }
720
721 pthread_mutex_lock(&channel->metadata_cache->lock);
722 ret = consumer_metadata_cache_write(channel, offset, len, metadata_str);
723 if (ret < 0) {
724 /* Unable to handle metadata. Notify session daemon. */
725 ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
726 }
727 pthread_mutex_unlock(&channel->metadata_cache->lock);
728
729 while (consumer_metadata_cache_flushed(channel, offset + len)) {
730 DBG("Waiting for metadata to be flushed");
731 usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME);
732 }
733
734 end_free:
735 free(metadata_str);
736 end:
737 return ret_code;
738 }
739
740 /*
741 * Receive command from session daemon and process it.
742 *
743 * Return 1 on success else a negative value or 0.
744 */
745 int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
746 int sock, struct pollfd *consumer_sockpoll)
747 {
748 ssize_t ret;
749 enum lttng_error_code ret_code = LTTNG_OK;
750 struct lttcomm_consumer_msg msg;
751 struct lttng_consumer_channel *channel = NULL;
752
753 ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
754 if (ret != sizeof(msg)) {
755 DBG("Consumer received unexpected message size %zd (expects %zu)",
756 ret, sizeof(msg));
757 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
758 /*
759 * The ret value might 0 meaning an orderly shutdown but this is ok
760 * since the caller handles this.
761 */
762 return ret;
763 }
764 if (msg.cmd_type == LTTNG_CONSUMER_STOP) {
765 /*
766 * Notify the session daemon that the command is completed.
767 *
768 * On transport layer error, the function call will print an error
769 * message so handling the returned code is a bit useless since we
770 * return an error code anyway.
771 */
772 (void) consumer_send_status_msg(sock, ret_code);
773 return -ENOENT;
774 }
775
776 /* relayd needs RCU read-side lock */
777 rcu_read_lock();
778
779 switch (msg.cmd_type) {
780 case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
781 {
782 /* Session daemon status message are handled in the following call. */
783 ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index,
784 msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll,
785 &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id);
786 goto end_nosignal;
787 }
788 case LTTNG_CONSUMER_DESTROY_RELAYD:
789 {
790 uint64_t index = msg.u.destroy_relayd.net_seq_idx;
791 struct consumer_relayd_sock_pair *relayd;
792
793 DBG("UST consumer destroying relayd %" PRIu64, index);
794
795 /* Get relayd reference if exists. */
796 relayd = consumer_find_relayd(index);
797 if (relayd == NULL) {
798 DBG("Unable to find relayd %" PRIu64, index);
799 ret_code = LTTNG_ERR_NO_CONSUMER;
800 }
801
802 /*
803 * Each relayd socket pair has a refcount of stream attached to it
804 * which tells if the relayd is still active or not depending on the
805 * refcount value.
806 *
807 * This will set the destroy flag of the relayd object and destroy it
808 * if the refcount reaches zero when called.
809 *
810 * The destroy can happen either here or when a stream fd hangs up.
811 */
812 if (relayd) {
813 consumer_flag_relayd_for_destroy(relayd);
814 }
815
816 goto end_msg_sessiond;
817 }
818 case LTTNG_CONSUMER_UPDATE_STREAM:
819 {
820 rcu_read_unlock();
821 return -ENOSYS;
822 }
823 case LTTNG_CONSUMER_DATA_PENDING:
824 {
825 int ret, is_data_pending;
826 uint64_t id = msg.u.data_pending.session_id;
827
828 DBG("UST consumer data pending command for id %" PRIu64, id);
829
830 is_data_pending = consumer_data_pending(id);
831
832 /* Send back returned value to session daemon */
833 ret = lttcomm_send_unix_sock(sock, &is_data_pending,
834 sizeof(is_data_pending));
835 if (ret < 0) {
836 DBG("Error when sending the data pending ret code: %d", ret);
837 }
838
839 /*
840 * No need to send back a status message since the data pending
841 * returned value is the response.
842 */
843 break;
844 }
845 case LTTNG_CONSUMER_ASK_CHANNEL_CREATION:
846 {
847 int ret;
848 struct ustctl_consumer_channel_attr attr;
849
850 /* Create a plain object and reserve a channel key. */
851 channel = allocate_channel(msg.u.ask_channel.session_id,
852 msg.u.ask_channel.pathname, msg.u.ask_channel.name,
853 msg.u.ask_channel.uid, msg.u.ask_channel.gid,
854 msg.u.ask_channel.relayd_id, msg.u.ask_channel.key,
855 (enum lttng_event_output) msg.u.ask_channel.output,
856 msg.u.ask_channel.tracefile_size,
857 msg.u.ask_channel.tracefile_count);
858 if (!channel) {
859 goto end_channel_error;
860 }
861
862 /*
863 * Set refcount to 1 for owner. Below, we will pass
864 * ownership to the consumer_thread_channel_poll()
865 * thread.
866 */
867 channel->refcount = 1;
868
869 /* Build channel attributes from received message. */
870 attr.subbuf_size = msg.u.ask_channel.subbuf_size;
871 attr.num_subbuf = msg.u.ask_channel.num_subbuf;
872 attr.overwrite = msg.u.ask_channel.overwrite;
873 attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval;
874 attr.read_timer_interval = msg.u.ask_channel.read_timer_interval;
875 attr.chan_id = msg.u.ask_channel.chan_id;
876 memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid));
877
878 /* Translate the event output type to UST. */
879 switch (channel->output) {
880 case LTTNG_EVENT_SPLICE:
881 /* Splice not supported so fallback on mmap(). */
882 case LTTNG_EVENT_MMAP:
883 default:
884 attr.output = CONSUMER_CHANNEL_MMAP;
885 break;
886 };
887
888 /* Translate and save channel type. */
889 switch (msg.u.ask_channel.type) {
890 case LTTNG_UST_CHAN_PER_CPU:
891 channel->type = CONSUMER_CHANNEL_TYPE_DATA;
892 attr.type = LTTNG_UST_CHAN_PER_CPU;
893 break;
894 case LTTNG_UST_CHAN_METADATA:
895 channel->type = CONSUMER_CHANNEL_TYPE_METADATA;
896 attr.type = LTTNG_UST_CHAN_METADATA;
897 break;
898 default:
899 assert(0);
900 goto error_fatal;
901 };
902
903 ret = ask_channel(ctx, sock, channel, &attr);
904 if (ret < 0) {
905 goto end_channel_error;
906 }
907
908 if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) {
909 ret = consumer_metadata_cache_allocate(channel);
910 if (ret < 0) {
911 ERR("Allocating metadata cache");
912 goto end_channel_error;
913 }
914 consumer_timer_switch_start(channel, attr.switch_timer_interval);
915 attr.switch_timer_interval = 0;
916 }
917
918 /*
919 * Add the channel to the internal state AFTER all streams were created
920 * and successfully sent to session daemon. This way, all streams must
921 * be ready before this channel is visible to the threads.
922 * If add_channel succeeds, ownership of the channel is
923 * passed to consumer_thread_channel_poll().
924 */
925 ret = add_channel(channel, ctx);
926 if (ret < 0) {
927 goto end_channel_error;
928 }
929
930
931 /*
932 * Channel and streams are now created. Inform the session daemon that
933 * everything went well and should wait to receive the channel and
934 * streams with ustctl API.
935 */
936 ret = consumer_send_status_channel(sock, channel);
937 if (ret < 0) {
938 /*
939 * There is probably a problem on the socket so the poll will get
940 * it and clean everything up.
941 */
942 goto end_nosignal;
943 }
944
945 break;
946 }
947 case LTTNG_CONSUMER_GET_CHANNEL:
948 {
949 int ret, relayd_err = 0;
950 uint64_t key = msg.u.get_channel.key;
951 struct lttng_consumer_channel *channel;
952
953 channel = consumer_find_channel(key);
954 if (!channel) {
955 ERR("UST consumer get channel key %" PRIu64 " not found", key);
956 ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
957 goto end_msg_sessiond;
958 }
959
960 /* Inform sessiond that we are about to send channel and streams. */
961 ret = consumer_send_status_msg(sock, LTTNG_OK);
962 if (ret < 0) {
963 /* Somehow, the session daemon is not responding anymore. */
964 goto end_nosignal;
965 }
966
967 /* Send everything to sessiond. */
968 ret = send_sessiond_channel(sock, channel, ctx, &relayd_err);
969 if (ret < 0) {
970 if (relayd_err) {
971 /*
972 * We were unable to send to the relayd the stream so avoid
973 * sending back a fatal error to the thread since this is OK
974 * and the consumer can continue its work.
975 */
976 ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL;
977 goto end_msg_sessiond;
978 }
979 /*
980 * The communicaton was broken hence there is a bad state between
981 * the consumer and sessiond so stop everything.
982 */
983 goto error_fatal;
984 }
985
986 ret = send_streams_to_thread(channel, ctx);
987 if (ret < 0) {
988 /*
989 * If we are unable to send the stream to the thread, there is
990 * a big problem so just stop everything.
991 */
992 goto error_fatal;
993 }
994 /* List MUST be empty after or else it could be reused. */
995 assert(cds_list_empty(&channel->streams.head));
996
997 goto end_msg_sessiond;
998 }
999 case LTTNG_CONSUMER_DESTROY_CHANNEL:
1000 {
1001 uint64_t key = msg.u.destroy_channel.key;
1002 struct lttng_consumer_channel *channel;
1003
1004 channel = consumer_find_channel(key);
1005 if (!channel) {
1006 ERR("UST consumer get channel key %" PRIu64 " not found", key);
1007 ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1008 goto end_msg_sessiond;
1009 }
1010
1011 destroy_channel(channel);
1012
1013 goto end_msg_sessiond;
1014 }
1015 case LTTNG_CONSUMER_CLOSE_METADATA:
1016 {
1017 int ret;
1018
1019 ret = close_metadata(msg.u.close_metadata.key);
1020 if (ret != 0) {
1021 ret_code = ret;
1022 }
1023
1024 goto end_msg_sessiond;
1025 }
1026 case LTTNG_CONSUMER_FLUSH_CHANNEL:
1027 {
1028 int ret;
1029
1030 ret = flush_channel(msg.u.flush_channel.key);
1031 if (ret != 0) {
1032 ret_code = ret;
1033 }
1034
1035 goto end_msg_sessiond;
1036 }
1037 case LTTNG_CONSUMER_PUSH_METADATA:
1038 {
1039 int ret;
1040 uint64_t len = msg.u.push_metadata.len;
1041 uint64_t key = msg.u.push_metadata.key;
1042 uint64_t offset = msg.u.push_metadata.target_offset;
1043 struct lttng_consumer_channel *channel;
1044
1045 DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key,
1046 len);
1047
1048 channel = consumer_find_channel(key);
1049 if (!channel) {
1050 ERR("UST consumer push metadata %" PRIu64 " not found", key);
1051 ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1052 goto end_msg_sessiond;
1053 }
1054
1055 /* Tell session daemon we are ready to receive the metadata. */
1056 ret = consumer_send_status_msg(sock, LTTNG_OK);
1057 if (ret < 0) {
1058 /* Somehow, the session daemon is not responding anymore. */
1059 goto error_fatal;
1060 }
1061
1062 /* Wait for more data. */
1063 if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
1064 goto end_nosignal;
1065 }
1066
1067 ret = lttng_ustconsumer_recv_metadata(sock, key, offset,
1068 len, channel);
1069 if (ret < 0) {
1070 /* error receiving from sessiond */
1071 goto end_nosignal;
1072 } else {
1073 ret_code = ret;
1074 goto end_msg_sessiond;
1075 }
1076 }
1077 case LTTNG_CONSUMER_SETUP_METADATA:
1078 {
1079 int ret;
1080
1081 ret = setup_metadata(ctx, msg.u.setup_metadata.key);
1082 if (ret) {
1083 ret_code = ret;
1084 }
1085 goto end_msg_sessiond;
1086 }
1087 default:
1088 break;
1089 }
1090
1091 end_nosignal:
1092 rcu_read_unlock();
1093
1094 /*
1095 * Return 1 to indicate success since the 0 value can be a socket
1096 * shutdown during the recv() or send() call.
1097 */
1098 return 1;
1099
1100 end_msg_sessiond:
1101 /*
1102 * The returned value here is not useful since either way we'll return 1 to
1103 * the caller because the session daemon socket management is done
1104 * elsewhere. Returning a negative code or 0 will shutdown the consumer.
1105 */
1106 (void) consumer_send_status_msg(sock, ret_code);
1107 rcu_read_unlock();
1108 return 1;
1109 end_channel_error:
1110 if (channel) {
1111 /*
1112 * Free channel here since no one has a reference to it. We don't
1113 * free after that because a stream can store this pointer.
1114 */
1115 destroy_channel(channel);
1116 }
1117 /* We have to send a status channel message indicating an error. */
1118 ret = consumer_send_status_channel(sock, NULL);
1119 if (ret < 0) {
1120 /* Stop everything if session daemon can not be notified. */
1121 goto error_fatal;
1122 }
1123 rcu_read_unlock();
1124 return 1;
1125 error_fatal:
1126 rcu_read_unlock();
1127 /* This will issue a consumer stop. */
1128 return -1;
1129 }
1130
1131 /*
1132 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
1133 * compiled out, we isolate it in this library.
1134 */
1135 int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream,
1136 unsigned long *off)
1137 {
1138 assert(stream);
1139 assert(stream->ustream);
1140
1141 return ustctl_get_mmap_read_offset(stream->ustream, off);
1142 }
1143
1144 /*
1145 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
1146 * compiled out, we isolate it in this library.
1147 */
1148 void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream)
1149 {
1150 assert(stream);
1151 assert(stream->ustream);
1152
1153 return ustctl_get_mmap_base(stream->ustream);
1154 }
1155
1156 /*
1157 * Take a snapshot for a specific fd
1158 *
1159 * Returns 0 on success, < 0 on error
1160 */
1161 int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream)
1162 {
1163 assert(stream);
1164 assert(stream->ustream);
1165
1166 return ustctl_snapshot(stream->ustream);
1167 }
1168
1169 /*
1170 * Get the produced position
1171 *
1172 * Returns 0 on success, < 0 on error
1173 */
1174 int lttng_ustconsumer_get_produced_snapshot(
1175 struct lttng_consumer_stream *stream, unsigned long *pos)
1176 {
1177 assert(stream);
1178 assert(stream->ustream);
1179 assert(pos);
1180
1181 return ustctl_snapshot_get_produced(stream->ustream, pos);
1182 }
1183
1184 /*
1185 * Called when the stream signal the consumer that it has hang up.
1186 */
1187 void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
1188 {
1189 assert(stream);
1190 assert(stream->ustream);
1191
1192 ustctl_flush_buffer(stream->ustream, 0);
1193 stream->hangup_flush_done = 1;
1194 }
1195
1196 void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
1197 {
1198 assert(chan);
1199 assert(chan->uchan);
1200
1201 ustctl_destroy_channel(chan->uchan);
1202 }
1203
1204 void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
1205 {
1206 assert(stream);
1207 assert(stream->ustream);
1208
1209 ustctl_destroy_stream(stream->ustream);
1210 }
1211
1212 int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
1213 struct lttng_consumer_local_data *ctx)
1214 {
1215 unsigned long len, subbuf_size, padding;
1216 int err;
1217 long ret = 0;
1218 char dummy;
1219 struct ustctl_consumer_stream *ustream;
1220
1221 assert(stream);
1222 assert(stream->ustream);
1223 assert(ctx);
1224
1225 DBG2("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd,
1226 stream->name);
1227
1228 /* Ease our life for what's next. */
1229 ustream = stream->ustream;
1230
1231 /* We can consume the 1 byte written into the wait_fd by UST */
1232 if (!stream->hangup_flush_done) {
1233 ssize_t readlen;
1234
1235 do {
1236 readlen = read(stream->wait_fd, &dummy, 1);
1237 } while (readlen == -1 && errno == EINTR);
1238 if (readlen == -1) {
1239 ret = readlen;
1240 goto end;
1241 }
1242 }
1243
1244 /* Get the next subbuffer */
1245 err = ustctl_get_next_subbuf(ustream);
1246 if (err != 0) {
1247 ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
1248 /*
1249 * This is a debug message even for single-threaded consumer,
1250 * because poll() have more relaxed criterions than get subbuf,
1251 * so get_subbuf may fail for short race windows where poll()
1252 * would issue wakeups.
1253 */
1254 DBG("Reserving sub buffer failed (everything is normal, "
1255 "it is due to concurrency) [ret: %d]", err);
1256 goto end;
1257 }
1258 assert(stream->chan->output == CONSUMER_CHANNEL_MMAP);
1259 /* Get the full padded subbuffer size */
1260 err = ustctl_get_padded_subbuf_size(ustream, &len);
1261 assert(err == 0);
1262
1263 /* Get subbuffer data size (without padding) */
1264 err = ustctl_get_subbuf_size(ustream, &subbuf_size);
1265 assert(err == 0);
1266
1267 /* Make sure we don't get a subbuffer size bigger than the padded */
1268 assert(len >= subbuf_size);
1269
1270 padding = len - subbuf_size;
1271 /* write the subbuffer to the tracefile */
1272 ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding);
1273 /*
1274 * The mmap operation should write subbuf_size amount of data when network
1275 * streaming or the full padding (len) size when we are _not_ streaming.
1276 */
1277 if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) ||
1278 (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) {
1279 /*
1280 * Display the error but continue processing to try to release the
1281 * subbuffer. This is a DBG statement since any unexpected kill or
1282 * signal, the application gets unregistered, relayd gets closed or
1283 * anything that affects the buffer lifetime will trigger this error.
1284 * So, for the sake of the user, don't print this error since it can
1285 * happen and it is OK with the code flow.
1286 */
1287 DBG("Error writing to tracefile "
1288 "(ret: %ld != len: %lu != subbuf_size: %lu)",
1289 ret, len, subbuf_size);
1290 }
1291 err = ustctl_put_next_subbuf(ustream);
1292 assert(err == 0);
1293
1294 end:
1295 return ret;
1296 }
1297
1298 /*
1299 * Called when a stream is created.
1300 *
1301 * Return 0 on success or else a negative value.
1302 */
1303 int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
1304 {
1305 int ret;
1306
1307 /* Don't create anything if this is set for streaming. */
1308 if (stream->net_seq_idx == (uint64_t) -1ULL) {
1309 ret = utils_create_stream_file(stream->chan->pathname, stream->name,
1310 stream->chan->tracefile_size, stream->tracefile_count_current,
1311 stream->uid, stream->gid);
1312 if (ret < 0) {
1313 goto error;
1314 }
1315 stream->out_fd = ret;
1316 stream->tracefile_size_current = 0;
1317 }
1318 ret = 0;
1319
1320 error:
1321 return ret;
1322 }
1323
1324 /*
1325 * Check if data is still being extracted from the buffers for a specific
1326 * stream. Consumer data lock MUST be acquired before calling this function
1327 * and the stream lock.
1328 *
1329 * Return 1 if the traced data are still getting read else 0 meaning that the
1330 * data is available for trace viewer reading.
1331 */
1332 int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream)
1333 {
1334 int ret;
1335
1336 assert(stream);
1337 assert(stream->ustream);
1338
1339 DBG("UST consumer checking data pending");
1340
1341 ret = ustctl_get_next_subbuf(stream->ustream);
1342 if (ret == 0) {
1343 /* There is still data so let's put back this subbuffer. */
1344 ret = ustctl_put_subbuf(stream->ustream);
1345 assert(ret == 0);
1346 ret = 1; /* Data is pending */
1347 goto end;
1348 }
1349
1350 /* Data is NOT pending so ready to be read. */
1351 ret = 0;
1352
1353 end:
1354 return ret;
1355 }
1356
1357 /*
1358 * Close every metadata stream wait fd of the metadata hash table. This
1359 * function MUST be used very carefully so not to run into a race between the
1360 * metadata thread handling streams and this function closing their wait fd.
1361 *
1362 * For UST, this is used when the session daemon hangs up. Its the metadata
1363 * producer so calling this is safe because we are assured that no state change
1364 * can occur in the metadata thread for the streams in the hash table.
1365 */
1366 void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht)
1367 {
1368 int ret;
1369 struct lttng_ht_iter iter;
1370 struct lttng_consumer_stream *stream;
1371
1372 assert(metadata_ht);
1373 assert(metadata_ht->ht);
1374
1375 DBG("UST consumer closing all metadata streams");
1376
1377 rcu_read_lock();
1378 cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream,
1379 node.node) {
1380 int fd = stream->wait_fd;
1381
1382 /*
1383 * Whatever happens here we have to continue to try to close every
1384 * streams. Let's report at least the error on failure.
1385 */
1386 ret = ustctl_stream_close_wakeup_fd(stream->ustream);
1387 if (ret) {
1388 ERR("Unable to close metadata stream fd %d ret %d", fd, ret);
1389 }
1390 DBG("Metadata wait fd %d closed", fd);
1391 }
1392 rcu_read_unlock();
1393 }
1394
1395 void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream)
1396 {
1397 int ret;
1398
1399 ret = ustctl_stream_close_wakeup_fd(stream->ustream);
1400 if (ret < 0) {
1401 ERR("Unable to close wakeup fd");
1402 }
1403 }
1404
1405 int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx,
1406 struct lttng_consumer_channel *channel)
1407 {
1408 struct lttcomm_metadata_request_msg request;
1409 struct lttcomm_consumer_msg msg;
1410 enum lttng_error_code ret_code = LTTNG_OK;
1411 uint64_t len, key, offset;
1412 int ret;
1413
1414 assert(channel);
1415 assert(channel->metadata_cache);
1416
1417 /* send the metadata request to sessiond */
1418 switch (consumer_data.type) {
1419 case LTTNG_CONSUMER64_UST:
1420 request.bits_per_long = 64;
1421 break;
1422 case LTTNG_CONSUMER32_UST:
1423 request.bits_per_long = 32;
1424 break;
1425 default:
1426 request.bits_per_long = 0;
1427 break;
1428 }
1429
1430 request.session_id = channel->session_id;
1431 request.uid = channel->uid;
1432 request.key = channel->key;
1433 DBG("Sending metadata request to sessiond, session %" PRIu64,
1434 channel->session_id);
1435
1436 ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request,
1437 sizeof(request));
1438 if (ret < 0) {
1439 ERR("Asking metadata to sessiond");
1440 goto end;
1441 }
1442
1443 /* Receive the metadata from sessiond */
1444 ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg,
1445 sizeof(msg));
1446 if (ret != sizeof(msg)) {
1447 DBG("Consumer received unexpected message size %d (expects %zu)",
1448 ret, sizeof(msg));
1449 lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
1450 /*
1451 * The ret value might 0 meaning an orderly shutdown but this is ok
1452 * since the caller handles this.
1453 */
1454 goto end;
1455 }
1456
1457 if (msg.cmd_type == LTTNG_ERR_UND) {
1458 /* No registry found */
1459 (void) consumer_send_status_msg(ctx->consumer_metadata_socket,
1460 ret_code);
1461 ret = 0;
1462 goto end;
1463 } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) {
1464 ERR("Unexpected cmd_type received %d", msg.cmd_type);
1465 ret = -1;
1466 goto end;
1467 }
1468
1469 len = msg.u.push_metadata.len;
1470 key = msg.u.push_metadata.key;
1471 offset = msg.u.push_metadata.target_offset;
1472
1473 assert(key == channel->key);
1474 if (len == 0) {
1475 DBG("No new metadata to receive for key %" PRIu64, key);
1476 }
1477
1478 /* Tell session daemon we are ready to receive the metadata. */
1479 ret = consumer_send_status_msg(ctx->consumer_metadata_socket,
1480 LTTNG_OK);
1481 if (ret < 0 || len == 0) {
1482 /*
1483 * Somehow, the session daemon is not responding anymore or there is
1484 * nothing to receive.
1485 */
1486 goto end;
1487 }
1488
1489 ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket,
1490 key, offset, len, channel);
1491 (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code);
1492 ret = 0;
1493
1494 end:
1495 return ret;
1496 }
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