Implement consumer ring buffer position sampling
[lttng-tools.git] / src / bin / lttng-sessiond / consumer.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _LGPL_SOURCE
19 #include <assert.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26 #include <inttypes.h>
27
28 #include <common/common.h>
29 #include <common/defaults.h>
30 #include <common/uri.h>
31 #include <common/relayd/relayd.h>
32
33 #include "consumer.h"
34 #include "health-sessiond.h"
35 #include "ust-app.h"
36 #include "utils.h"
37
38 /*
39 * Send a data payload using a given consumer socket of size len.
40 *
41 * The consumer socket lock MUST be acquired before calling this since this
42 * function can change the fd value.
43 *
44 * Return 0 on success else a negative value on error.
45 */
46 int consumer_socket_send(struct consumer_socket *socket, void *msg, size_t len)
47 {
48 int fd;
49 ssize_t size;
50
51 assert(socket);
52 assert(socket->fd_ptr);
53 assert(msg);
54
55 /* Consumer socket is invalid. Stopping. */
56 fd = *socket->fd_ptr;
57 if (fd < 0) {
58 goto error;
59 }
60
61 size = lttcomm_send_unix_sock(fd, msg, len);
62 if (size < 0) {
63 /* The above call will print a PERROR on error. */
64 DBG("Error when sending data to consumer on sock %d", fd);
65 /*
66 * At this point, the socket is not usable anymore thus closing it and
67 * setting the file descriptor to -1 so it is not reused.
68 */
69
70 /* This call will PERROR on error. */
71 (void) lttcomm_close_unix_sock(fd);
72 *socket->fd_ptr = -1;
73 goto error;
74 }
75
76 return 0;
77
78 error:
79 return -1;
80 }
81
82 /*
83 * Receive a data payload using a given consumer socket of size len.
84 *
85 * The consumer socket lock MUST be acquired before calling this since this
86 * function can change the fd value.
87 *
88 * Return 0 on success else a negative value on error.
89 */
90 int consumer_socket_recv(struct consumer_socket *socket, void *msg, size_t len)
91 {
92 int fd;
93 ssize_t size;
94
95 assert(socket);
96 assert(socket->fd_ptr);
97 assert(msg);
98
99 /* Consumer socket is invalid. Stopping. */
100 fd = *socket->fd_ptr;
101 if (fd < 0) {
102 goto error;
103 }
104
105 size = lttcomm_recv_unix_sock(fd, msg, len);
106 if (size <= 0) {
107 /* The above call will print a PERROR on error. */
108 DBG("Error when receiving data from the consumer socket %d", fd);
109 /*
110 * At this point, the socket is not usable anymore thus closing it and
111 * setting the file descriptor to -1 so it is not reused.
112 */
113
114 /* This call will PERROR on error. */
115 (void) lttcomm_close_unix_sock(fd);
116 *socket->fd_ptr = -1;
117 goto error;
118 }
119
120 return 0;
121
122 error:
123 return -1;
124 }
125
126 /*
127 * Receive a reply command status message from the consumer. Consumer socket
128 * lock MUST be acquired before calling this function.
129 *
130 * Return 0 on success, -1 on recv error or a negative lttng error code which
131 * was possibly returned by the consumer.
132 */
133 int consumer_recv_status_reply(struct consumer_socket *sock)
134 {
135 int ret;
136 struct lttcomm_consumer_status_msg reply;
137
138 assert(sock);
139
140 ret = consumer_socket_recv(sock, &reply, sizeof(reply));
141 if (ret < 0) {
142 goto end;
143 }
144
145 if (reply.ret_code == LTTCOMM_CONSUMERD_SUCCESS) {
146 /* All good. */
147 ret = 0;
148 } else {
149 ret = -reply.ret_code;
150 DBG("Consumer ret code %d", ret);
151 }
152
153 end:
154 return ret;
155 }
156
157 /*
158 * Once the ASK_CHANNEL command is sent to the consumer, the channel
159 * information are sent back. This call receives that data and populates key
160 * and stream_count.
161 *
162 * On success return 0 and both key and stream_count are set. On error, a
163 * negative value is sent back and both parameters are untouched.
164 */
165 int consumer_recv_status_channel(struct consumer_socket *sock,
166 uint64_t *key, unsigned int *stream_count)
167 {
168 int ret;
169 struct lttcomm_consumer_status_channel reply;
170
171 assert(sock);
172 assert(stream_count);
173 assert(key);
174
175 ret = consumer_socket_recv(sock, &reply, sizeof(reply));
176 if (ret < 0) {
177 goto end;
178 }
179
180 /* An error is possible so don't touch the key and stream_count. */
181 if (reply.ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
182 ret = -1;
183 goto end;
184 }
185
186 *key = reply.key;
187 *stream_count = reply.stream_count;
188 ret = 0;
189
190 end:
191 return ret;
192 }
193
194 /*
195 * Send destroy relayd command to consumer.
196 *
197 * On success return positive value. On error, negative value.
198 */
199 int consumer_send_destroy_relayd(struct consumer_socket *sock,
200 struct consumer_output *consumer)
201 {
202 int ret;
203 struct lttcomm_consumer_msg msg;
204
205 assert(consumer);
206 assert(sock);
207
208 DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd_ptr);
209
210 memset(&msg, 0, sizeof(msg));
211 msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD;
212 msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index;
213
214 pthread_mutex_lock(sock->lock);
215 ret = consumer_socket_send(sock, &msg, sizeof(msg));
216 if (ret < 0) {
217 goto error;
218 }
219
220 /* Don't check the return value. The caller will do it. */
221 ret = consumer_recv_status_reply(sock);
222
223 DBG2("Consumer send destroy relayd command done");
224
225 error:
226 pthread_mutex_unlock(sock->lock);
227 return ret;
228 }
229
230 /*
231 * For each consumer socket in the consumer output object, send a destroy
232 * relayd command.
233 */
234 void consumer_output_send_destroy_relayd(struct consumer_output *consumer)
235 {
236 struct lttng_ht_iter iter;
237 struct consumer_socket *socket;
238
239 assert(consumer);
240
241 /* Destroy any relayd connection */
242 if (consumer->type == CONSUMER_DST_NET) {
243 rcu_read_lock();
244 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
245 node.node) {
246 int ret;
247
248 /* Send destroy relayd command */
249 ret = consumer_send_destroy_relayd(socket, consumer);
250 if (ret < 0) {
251 DBG("Unable to send destroy relayd command to consumer");
252 /* Continue since we MUST delete everything at this point. */
253 }
254 }
255 rcu_read_unlock();
256 }
257 }
258
259 /*
260 * From a consumer_data structure, allocate and add a consumer socket to the
261 * consumer output.
262 *
263 * Return 0 on success, else negative value on error
264 */
265 int consumer_create_socket(struct consumer_data *data,
266 struct consumer_output *output)
267 {
268 int ret = 0;
269 struct consumer_socket *socket;
270
271 assert(data);
272
273 if (output == NULL || data->cmd_sock < 0) {
274 /*
275 * Not an error. Possible there is simply not spawned consumer or it's
276 * disabled for the tracing session asking the socket.
277 */
278 goto error;
279 }
280
281 rcu_read_lock();
282 socket = consumer_find_socket(data->cmd_sock, output);
283 rcu_read_unlock();
284 if (socket == NULL) {
285 socket = consumer_allocate_socket(&data->cmd_sock);
286 if (socket == NULL) {
287 ret = -1;
288 goto error;
289 }
290
291 socket->registered = 0;
292 socket->lock = &data->lock;
293 rcu_read_lock();
294 consumer_add_socket(socket, output);
295 rcu_read_unlock();
296 }
297
298 socket->type = data->type;
299
300 DBG3("Consumer socket created (fd: %d) and added to output",
301 data->cmd_sock);
302
303 error:
304 return ret;
305 }
306
307 /*
308 * Return the consumer socket from the given consumer output with the right
309 * bitness. On error, returns NULL.
310 *
311 * The caller MUST acquire a rcu read side lock and keep it until the socket
312 * object reference is not needed anymore.
313 */
314 struct consumer_socket *consumer_find_socket_by_bitness(int bits,
315 struct consumer_output *consumer)
316 {
317 int consumer_fd;
318 struct consumer_socket *socket = NULL;
319
320 switch (bits) {
321 case 64:
322 consumer_fd = uatomic_read(&ust_consumerd64_fd);
323 break;
324 case 32:
325 consumer_fd = uatomic_read(&ust_consumerd32_fd);
326 break;
327 default:
328 assert(0);
329 goto end;
330 }
331
332 socket = consumer_find_socket(consumer_fd, consumer);
333 if (!socket) {
334 ERR("Consumer socket fd %d not found in consumer obj %p",
335 consumer_fd, consumer);
336 }
337
338 end:
339 return socket;
340 }
341
342 /*
343 * Find a consumer_socket in a consumer_output hashtable. Read side lock must
344 * be acquired before calling this function and across use of the
345 * returned consumer_socket.
346 */
347 struct consumer_socket *consumer_find_socket(int key,
348 struct consumer_output *consumer)
349 {
350 struct lttng_ht_iter iter;
351 struct lttng_ht_node_ulong *node;
352 struct consumer_socket *socket = NULL;
353
354 /* Negative keys are lookup failures */
355 if (key < 0 || consumer == NULL) {
356 return NULL;
357 }
358
359 lttng_ht_lookup(consumer->socks, (void *)((unsigned long) key),
360 &iter);
361 node = lttng_ht_iter_get_node_ulong(&iter);
362 if (node != NULL) {
363 socket = caa_container_of(node, struct consumer_socket, node);
364 }
365
366 return socket;
367 }
368
369 /*
370 * Allocate a new consumer_socket and return the pointer.
371 */
372 struct consumer_socket *consumer_allocate_socket(int *fd)
373 {
374 struct consumer_socket *socket = NULL;
375
376 assert(fd);
377
378 socket = zmalloc(sizeof(struct consumer_socket));
379 if (socket == NULL) {
380 PERROR("zmalloc consumer socket");
381 goto error;
382 }
383
384 socket->fd_ptr = fd;
385 lttng_ht_node_init_ulong(&socket->node, *fd);
386
387 error:
388 return socket;
389 }
390
391 /*
392 * Add consumer socket to consumer output object. Read side lock must be
393 * acquired before calling this function.
394 */
395 void consumer_add_socket(struct consumer_socket *sock,
396 struct consumer_output *consumer)
397 {
398 assert(sock);
399 assert(consumer);
400
401 lttng_ht_add_unique_ulong(consumer->socks, &sock->node);
402 }
403
404 /*
405 * Delte consumer socket to consumer output object. Read side lock must be
406 * acquired before calling this function.
407 */
408 void consumer_del_socket(struct consumer_socket *sock,
409 struct consumer_output *consumer)
410 {
411 int ret;
412 struct lttng_ht_iter iter;
413
414 assert(sock);
415 assert(consumer);
416
417 iter.iter.node = &sock->node.node;
418 ret = lttng_ht_del(consumer->socks, &iter);
419 assert(!ret);
420 }
421
422 /*
423 * RCU destroy call function.
424 */
425 static void destroy_socket_rcu(struct rcu_head *head)
426 {
427 struct lttng_ht_node_ulong *node =
428 caa_container_of(head, struct lttng_ht_node_ulong, head);
429 struct consumer_socket *socket =
430 caa_container_of(node, struct consumer_socket, node);
431
432 free(socket);
433 }
434
435 /*
436 * Destroy and free socket pointer in a call RCU. Read side lock must be
437 * acquired before calling this function.
438 */
439 void consumer_destroy_socket(struct consumer_socket *sock)
440 {
441 assert(sock);
442
443 /*
444 * We DO NOT close the file descriptor here since it is global to the
445 * session daemon and is closed only if the consumer dies or a custom
446 * consumer was registered,
447 */
448 if (sock->registered) {
449 DBG3("Consumer socket was registered. Closing fd %d", *sock->fd_ptr);
450 lttcomm_close_unix_sock(*sock->fd_ptr);
451 }
452
453 call_rcu(&sock->node.head, destroy_socket_rcu);
454 }
455
456 /*
457 * Allocate and assign data to a consumer_output object.
458 *
459 * Return pointer to structure.
460 */
461 struct consumer_output *consumer_create_output(enum consumer_dst_type type)
462 {
463 struct consumer_output *output = NULL;
464
465 output = zmalloc(sizeof(struct consumer_output));
466 if (output == NULL) {
467 PERROR("zmalloc consumer_output");
468 goto error;
469 }
470
471 /* By default, consumer output is enabled */
472 output->enabled = 1;
473 output->type = type;
474 output->net_seq_index = (uint64_t) -1ULL;
475 urcu_ref_init(&output->ref);
476
477 output->socks = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
478
479 error:
480 return output;
481 }
482
483 /*
484 * Iterate over the consumer output socket hash table and destroy them. The
485 * socket file descriptor are only closed if the consumer output was
486 * registered meaning it's an external consumer.
487 */
488 void consumer_destroy_output_sockets(struct consumer_output *obj)
489 {
490 struct lttng_ht_iter iter;
491 struct consumer_socket *socket;
492
493 if (!obj->socks) {
494 return;
495 }
496
497 rcu_read_lock();
498 cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) {
499 consumer_del_socket(socket, obj);
500 consumer_destroy_socket(socket);
501 }
502 rcu_read_unlock();
503 }
504
505 /*
506 * Delete the consumer_output object from the list and free the ptr.
507 *
508 * Should *NOT* be called with RCU read-side lock held.
509 */
510 static void consumer_release_output(struct urcu_ref *ref)
511 {
512 struct consumer_output *obj =
513 caa_container_of(ref, struct consumer_output, ref);
514
515 consumer_destroy_output_sockets(obj);
516
517 if (obj->socks) {
518 /* Finally destroy HT */
519 ht_cleanup_push(obj->socks);
520 }
521
522 free(obj);
523 }
524
525 /*
526 * Get the consumer_output object.
527 */
528 void consumer_output_get(struct consumer_output *obj)
529 {
530 urcu_ref_get(&obj->ref);
531 }
532
533 /*
534 * Put the consumer_output object.
535 *
536 * Should *NOT* be called with RCU read-side lock held.
537 */
538 void consumer_output_put(struct consumer_output *obj)
539 {
540 if (!obj) {
541 return;
542 }
543 urcu_ref_put(&obj->ref, consumer_release_output);
544 }
545
546 /*
547 * Copy consumer output and returned the newly allocated copy.
548 *
549 * Should *NOT* be called with RCU read-side lock held.
550 */
551 struct consumer_output *consumer_copy_output(struct consumer_output *obj)
552 {
553 int ret;
554 struct consumer_output *output;
555
556 assert(obj);
557
558 output = consumer_create_output(obj->type);
559 if (output == NULL) {
560 goto end;
561 }
562 output->enabled = obj->enabled;
563 output->net_seq_index = obj->net_seq_index;
564 memcpy(output->subdir, obj->subdir, PATH_MAX);
565 output->snapshot = obj->snapshot;
566 output->relay_major_version = obj->relay_major_version;
567 output->relay_minor_version = obj->relay_minor_version;
568 memcpy(&output->dst, &obj->dst, sizeof(output->dst));
569 ret = consumer_copy_sockets(output, obj);
570 if (ret < 0) {
571 goto error_put;
572 }
573 end:
574 return output;
575
576 error_put:
577 consumer_output_put(output);
578 return NULL;
579 }
580
581 /*
582 * Copy consumer sockets from src to dst.
583 *
584 * Return 0 on success or else a negative value.
585 */
586 int consumer_copy_sockets(struct consumer_output *dst,
587 struct consumer_output *src)
588 {
589 int ret = 0;
590 struct lttng_ht_iter iter;
591 struct consumer_socket *socket, *copy_sock;
592
593 assert(dst);
594 assert(src);
595
596 rcu_read_lock();
597 cds_lfht_for_each_entry(src->socks->ht, &iter.iter, socket, node.node) {
598 /* Ignore socket that are already there. */
599 copy_sock = consumer_find_socket(*socket->fd_ptr, dst);
600 if (copy_sock) {
601 continue;
602 }
603
604 /* Create new socket object. */
605 copy_sock = consumer_allocate_socket(socket->fd_ptr);
606 if (copy_sock == NULL) {
607 rcu_read_unlock();
608 ret = -ENOMEM;
609 goto error;
610 }
611
612 copy_sock->registered = socket->registered;
613 /*
614 * This is valid because this lock is shared accross all consumer
615 * object being the global lock of the consumer data structure of the
616 * session daemon.
617 */
618 copy_sock->lock = socket->lock;
619 consumer_add_socket(copy_sock, dst);
620 }
621 rcu_read_unlock();
622
623 error:
624 return ret;
625 }
626
627 /*
628 * Set network URI to the consumer output object.
629 *
630 * Return 0 on success. Return 1 if the URI were equal. Else, negative value on
631 * error.
632 */
633 int consumer_set_network_uri(struct consumer_output *obj,
634 struct lttng_uri *uri)
635 {
636 int ret;
637 char tmp_path[PATH_MAX];
638 char hostname[HOST_NAME_MAX];
639 struct lttng_uri *dst_uri = NULL;
640
641 /* Code flow error safety net. */
642 assert(obj);
643 assert(uri);
644
645 switch (uri->stype) {
646 case LTTNG_STREAM_CONTROL:
647 dst_uri = &obj->dst.net.control;
648 obj->dst.net.control_isset = 1;
649 if (uri->port == 0) {
650 /* Assign default port. */
651 uri->port = DEFAULT_NETWORK_CONTROL_PORT;
652 } else {
653 if (obj->dst.net.data_isset && uri->port ==
654 obj->dst.net.data.port) {
655 ret = -LTTNG_ERR_INVALID;
656 goto error;
657 }
658 }
659 DBG3("Consumer control URI set with port %d", uri->port);
660 break;
661 case LTTNG_STREAM_DATA:
662 dst_uri = &obj->dst.net.data;
663 obj->dst.net.data_isset = 1;
664 if (uri->port == 0) {
665 /* Assign default port. */
666 uri->port = DEFAULT_NETWORK_DATA_PORT;
667 } else {
668 if (obj->dst.net.control_isset && uri->port ==
669 obj->dst.net.control.port) {
670 ret = -LTTNG_ERR_INVALID;
671 goto error;
672 }
673 }
674 DBG3("Consumer data URI set with port %d", uri->port);
675 break;
676 default:
677 ERR("Set network uri type unknown %d", uri->stype);
678 ret = -LTTNG_ERR_INVALID;
679 goto error;
680 }
681
682 ret = uri_compare(dst_uri, uri);
683 if (!ret) {
684 /* Same URI, don't touch it and return success. */
685 DBG3("URI network compare are the same");
686 goto equal;
687 }
688
689 /* URIs were not equal, replacing it. */
690 memset(dst_uri, 0, sizeof(struct lttng_uri));
691 memcpy(dst_uri, uri, sizeof(struct lttng_uri));
692 obj->type = CONSUMER_DST_NET;
693
694 /* Handle subdir and add hostname in front. */
695 if (dst_uri->stype == LTTNG_STREAM_CONTROL) {
696 /* Get hostname to append it in the pathname */
697 ret = gethostname(hostname, sizeof(hostname));
698 if (ret < 0) {
699 PERROR("gethostname. Fallback on default localhost");
700 strncpy(hostname, "localhost", sizeof(hostname));
701 }
702 hostname[sizeof(hostname) - 1] = '\0';
703
704 /* Setup consumer subdir if none present in the control URI */
705 if (strlen(dst_uri->subdir) == 0) {
706 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
707 hostname, obj->subdir);
708 } else {
709 ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
710 hostname, dst_uri->subdir);
711 }
712 if (ret < 0) {
713 PERROR("snprintf set consumer uri subdir");
714 ret = -LTTNG_ERR_NOMEM;
715 goto error;
716 }
717
718 if (lttng_strncpy(obj->subdir, tmp_path, sizeof(obj->subdir))) {
719 ret = -LTTNG_ERR_INVALID;
720 goto error;
721 }
722 DBG3("Consumer set network uri subdir path %s", tmp_path);
723 }
724
725 return 0;
726 equal:
727 return 1;
728 error:
729 return ret;
730 }
731
732 /*
733 * Send file descriptor to consumer via sock.
734 */
735 int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd)
736 {
737 int ret;
738
739 assert(fds);
740 assert(sock);
741 assert(nb_fd > 0);
742
743 ret = lttcomm_send_fds_unix_sock(*sock->fd_ptr, fds, nb_fd);
744 if (ret < 0) {
745 /* The above call will print a PERROR on error. */
746 DBG("Error when sending consumer fds on sock %d", *sock->fd_ptr);
747 goto error;
748 }
749
750 ret = consumer_recv_status_reply(sock);
751 error:
752 return ret;
753 }
754
755 /*
756 * Consumer send communication message structure to consumer.
757 */
758 int consumer_send_msg(struct consumer_socket *sock,
759 struct lttcomm_consumer_msg *msg)
760 {
761 int ret;
762
763 assert(msg);
764 assert(sock);
765
766 ret = consumer_socket_send(sock, msg, sizeof(struct lttcomm_consumer_msg));
767 if (ret < 0) {
768 goto error;
769 }
770
771 ret = consumer_recv_status_reply(sock);
772
773 error:
774 return ret;
775 }
776
777 /*
778 * Consumer send channel communication message structure to consumer.
779 */
780 int consumer_send_channel(struct consumer_socket *sock,
781 struct lttcomm_consumer_msg *msg)
782 {
783 int ret;
784
785 assert(msg);
786 assert(sock);
787
788 ret = consumer_send_msg(sock, msg);
789 if (ret < 0) {
790 goto error;
791 }
792
793 error:
794 return ret;
795 }
796
797 /*
798 * Populate the given consumer msg structure with the ask_channel command
799 * information.
800 */
801 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
802 uint64_t subbuf_size,
803 uint64_t num_subbuf,
804 int overwrite,
805 unsigned int switch_timer_interval,
806 unsigned int read_timer_interval,
807 unsigned int live_timer_interval,
808 unsigned int monitor_timer_interval,
809 int output,
810 int type,
811 uint64_t session_id,
812 const char *pathname,
813 const char *name,
814 uid_t uid,
815 gid_t gid,
816 uint64_t relayd_id,
817 uint64_t key,
818 unsigned char *uuid,
819 uint32_t chan_id,
820 uint64_t tracefile_size,
821 uint64_t tracefile_count,
822 uint64_t session_id_per_pid,
823 unsigned int monitor,
824 uint32_t ust_app_uid,
825 const char *root_shm_path,
826 const char *shm_path)
827 {
828 assert(msg);
829
830 /* Zeroed structure */
831 memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
832
833 msg->cmd_type = LTTNG_CONSUMER_ASK_CHANNEL_CREATION;
834 msg->u.ask_channel.subbuf_size = subbuf_size;
835 msg->u.ask_channel.num_subbuf = num_subbuf ;
836 msg->u.ask_channel.overwrite = overwrite;
837 msg->u.ask_channel.switch_timer_interval = switch_timer_interval;
838 msg->u.ask_channel.read_timer_interval = read_timer_interval;
839 msg->u.ask_channel.live_timer_interval = live_timer_interval;
840 msg->u.ask_channel.monitor_timer_interval = monitor_timer_interval;
841 msg->u.ask_channel.output = output;
842 msg->u.ask_channel.type = type;
843 msg->u.ask_channel.session_id = session_id;
844 msg->u.ask_channel.session_id_per_pid = session_id_per_pid;
845 msg->u.ask_channel.uid = uid;
846 msg->u.ask_channel.gid = gid;
847 msg->u.ask_channel.relayd_id = relayd_id;
848 msg->u.ask_channel.key = key;
849 msg->u.ask_channel.chan_id = chan_id;
850 msg->u.ask_channel.tracefile_size = tracefile_size;
851 msg->u.ask_channel.tracefile_count = tracefile_count;
852 msg->u.ask_channel.monitor = monitor;
853 msg->u.ask_channel.ust_app_uid = ust_app_uid;
854
855 memcpy(msg->u.ask_channel.uuid, uuid, sizeof(msg->u.ask_channel.uuid));
856
857 if (pathname) {
858 strncpy(msg->u.ask_channel.pathname, pathname,
859 sizeof(msg->u.ask_channel.pathname));
860 msg->u.ask_channel.pathname[sizeof(msg->u.ask_channel.pathname)-1] = '\0';
861 }
862
863 strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name));
864 msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0';
865
866 if (root_shm_path) {
867 strncpy(msg->u.ask_channel.root_shm_path, root_shm_path,
868 sizeof(msg->u.ask_channel.root_shm_path));
869 msg->u.ask_channel.root_shm_path[sizeof(msg->u.ask_channel.root_shm_path) - 1] = '\0';
870 }
871 if (shm_path) {
872 strncpy(msg->u.ask_channel.shm_path, shm_path,
873 sizeof(msg->u.ask_channel.shm_path));
874 msg->u.ask_channel.shm_path[sizeof(msg->u.ask_channel.shm_path) - 1] = '\0';
875 }
876 }
877
878 /*
879 * Init channel communication message structure.
880 */
881 void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
882 enum lttng_consumer_command cmd,
883 uint64_t channel_key,
884 uint64_t session_id,
885 const char *pathname,
886 uid_t uid,
887 gid_t gid,
888 uint64_t relayd_id,
889 const char *name,
890 unsigned int nb_init_streams,
891 enum lttng_event_output output,
892 int type,
893 uint64_t tracefile_size,
894 uint64_t tracefile_count,
895 unsigned int monitor,
896 unsigned int live_timer_interval,
897 unsigned int monitor_timer_interval)
898 {
899 assert(msg);
900
901 /* Zeroed structure */
902 memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
903
904 /* Send channel */
905 msg->cmd_type = cmd;
906 msg->u.channel.channel_key = channel_key;
907 msg->u.channel.session_id = session_id;
908 msg->u.channel.uid = uid;
909 msg->u.channel.gid = gid;
910 msg->u.channel.relayd_id = relayd_id;
911 msg->u.channel.nb_init_streams = nb_init_streams;
912 msg->u.channel.output = output;
913 msg->u.channel.type = type;
914 msg->u.channel.tracefile_size = tracefile_size;
915 msg->u.channel.tracefile_count = tracefile_count;
916 msg->u.channel.monitor = monitor;
917 msg->u.channel.live_timer_interval = live_timer_interval;
918 msg->u.channel.monitor_timer_interval = monitor_timer_interval;
919
920 strncpy(msg->u.channel.pathname, pathname,
921 sizeof(msg->u.channel.pathname));
922 msg->u.channel.pathname[sizeof(msg->u.channel.pathname) - 1] = '\0';
923
924 strncpy(msg->u.channel.name, name, sizeof(msg->u.channel.name));
925 msg->u.channel.name[sizeof(msg->u.channel.name) - 1] = '\0';
926 }
927
928 /*
929 * Init stream communication message structure.
930 */
931 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
932 enum lttng_consumer_command cmd,
933 uint64_t channel_key,
934 uint64_t stream_key,
935 int cpu)
936 {
937 assert(msg);
938
939 memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
940
941 msg->cmd_type = cmd;
942 msg->u.stream.channel_key = channel_key;
943 msg->u.stream.stream_key = stream_key;
944 msg->u.stream.cpu = cpu;
945 }
946
947 void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
948 enum lttng_consumer_command cmd,
949 uint64_t channel_key, uint64_t net_seq_idx)
950 {
951 assert(msg);
952
953 memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
954
955 msg->cmd_type = cmd;
956 msg->u.sent_streams.channel_key = channel_key;
957 msg->u.sent_streams.net_seq_idx = net_seq_idx;
958 }
959
960 /*
961 * Send stream communication structure to the consumer.
962 */
963 int consumer_send_stream(struct consumer_socket *sock,
964 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
965 int *fds, size_t nb_fd)
966 {
967 int ret;
968
969 assert(msg);
970 assert(dst);
971 assert(sock);
972 assert(fds);
973
974 ret = consumer_send_msg(sock, msg);
975 if (ret < 0) {
976 goto error;
977 }
978
979 ret = consumer_send_fds(sock, fds, nb_fd);
980 if (ret < 0) {
981 goto error;
982 }
983
984 error:
985 return ret;
986 }
987
988 /*
989 * Send relayd socket to consumer associated with a session name.
990 *
991 * On success return positive value. On error, negative value.
992 */
993 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
994 struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
995 enum lttng_stream_type type, uint64_t session_id,
996 char *session_name, char *hostname, int session_live_timer)
997 {
998 int ret;
999 struct lttcomm_consumer_msg msg;
1000
1001 /* Code flow error. Safety net. */
1002 assert(rsock);
1003 assert(consumer);
1004 assert(consumer_sock);
1005
1006 memset(&msg, 0, sizeof(msg));
1007 /* Bail out if consumer is disabled */
1008 if (!consumer->enabled) {
1009 ret = LTTNG_OK;
1010 goto error;
1011 }
1012
1013 if (type == LTTNG_STREAM_CONTROL) {
1014 ret = relayd_create_session(rsock,
1015 &msg.u.relayd_sock.relayd_session_id,
1016 session_name, hostname, session_live_timer,
1017 consumer->snapshot);
1018 if (ret < 0) {
1019 /* Close the control socket. */
1020 (void) relayd_close(rsock);
1021 goto error;
1022 }
1023 }
1024
1025 msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET;
1026 /*
1027 * Assign network consumer output index using the temporary consumer since
1028 * this call should only be made from within a set_consumer_uri() function
1029 * call in the session daemon.
1030 */
1031 msg.u.relayd_sock.net_index = consumer->net_seq_index;
1032 msg.u.relayd_sock.type = type;
1033 msg.u.relayd_sock.session_id = session_id;
1034 memcpy(&msg.u.relayd_sock.sock, rsock, sizeof(msg.u.relayd_sock.sock));
1035
1036 DBG3("Sending relayd sock info to consumer on %d", *consumer_sock->fd_ptr);
1037 ret = consumer_send_msg(consumer_sock, &msg);
1038 if (ret < 0) {
1039 goto error;
1040 }
1041
1042 DBG3("Sending relayd socket file descriptor to consumer");
1043 ret = consumer_send_fds(consumer_sock, &rsock->sock.fd, 1);
1044 if (ret < 0) {
1045 goto error;
1046 }
1047
1048 DBG2("Consumer relayd socket sent");
1049
1050 error:
1051 return ret;
1052 }
1053
1054 int consumer_send_channel_monitor_pipe(struct consumer_socket *consumer_sock,
1055 int pipe)
1056 {
1057 int ret;
1058 struct lttcomm_consumer_msg msg;
1059
1060 /* Code flow error. Safety net. */
1061
1062 memset(&msg, 0, sizeof(msg));
1063 msg.cmd_type = LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE;
1064
1065 DBG3("Sending set_channel_monitor_pipe command to consumer");
1066 ret = consumer_send_msg(consumer_sock, &msg);
1067 if (ret < 0) {
1068 goto error;
1069 }
1070
1071 DBG3("Sending channel monitoring pipe %d to consumer on socket %d",
1072 pipe, *consumer_sock->fd_ptr);
1073 ret = consumer_send_fds(consumer_sock, &pipe, 1);
1074 if (ret < 0) {
1075 goto error;
1076 }
1077
1078 DBG2("Channel monitoring pipe successfully sent");
1079 error:
1080 return ret;
1081 }
1082
1083 /*
1084 * Set consumer subdirectory using the session name and a generated datetime if
1085 * needed. This is appended to the current subdirectory.
1086 */
1087 int consumer_set_subdir(struct consumer_output *consumer,
1088 const char *session_name)
1089 {
1090 int ret = 0;
1091 unsigned int have_default_name = 0;
1092 char datetime[16], tmp_path[PATH_MAX];
1093 time_t rawtime;
1094 struct tm *timeinfo;
1095
1096 assert(consumer);
1097 assert(session_name);
1098
1099 memset(tmp_path, 0, sizeof(tmp_path));
1100
1101 /* Flag if we have a default session. */
1102 if (strncmp(session_name, DEFAULT_SESSION_NAME "-",
1103 strlen(DEFAULT_SESSION_NAME) + 1) == 0) {
1104 have_default_name = 1;
1105 } else {
1106 /* Get date and time for session path */
1107 time(&rawtime);
1108 timeinfo = localtime(&rawtime);
1109 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
1110 }
1111
1112 if (have_default_name) {
1113 ret = snprintf(tmp_path, sizeof(tmp_path),
1114 "%s/%s", consumer->subdir, session_name);
1115 } else {
1116 ret = snprintf(tmp_path, sizeof(tmp_path),
1117 "%s/%s-%s/", consumer->subdir, session_name, datetime);
1118 }
1119 if (ret < 0) {
1120 PERROR("snprintf session name date");
1121 goto error;
1122 }
1123
1124 if (lttng_strncpy(consumer->subdir, tmp_path,
1125 sizeof(consumer->subdir))) {
1126 ret = -EINVAL;
1127 goto error;
1128 }
1129 DBG2("Consumer subdir set to %s", consumer->subdir);
1130
1131 error:
1132 return ret;
1133 }
1134
1135 /*
1136 * Ask the consumer if the data is pending for the specific session id.
1137 * Returns 1 if data is pending, 0 otherwise, or < 0 on error.
1138 */
1139 int consumer_is_data_pending(uint64_t session_id,
1140 struct consumer_output *consumer)
1141 {
1142 int ret;
1143 int32_t ret_code = 0; /* Default is that the data is NOT pending */
1144 struct consumer_socket *socket;
1145 struct lttng_ht_iter iter;
1146 struct lttcomm_consumer_msg msg;
1147
1148 assert(consumer);
1149
1150 DBG3("Consumer data pending for id %" PRIu64, session_id);
1151
1152 memset(&msg, 0, sizeof(msg));
1153 msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
1154 msg.u.data_pending.session_id = session_id;
1155
1156 /* Send command for each consumer */
1157 rcu_read_lock();
1158 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
1159 node.node) {
1160 pthread_mutex_lock(socket->lock);
1161 ret = consumer_socket_send(socket, &msg, sizeof(msg));
1162 if (ret < 0) {
1163 pthread_mutex_unlock(socket->lock);
1164 goto error_unlock;
1165 }
1166
1167 /*
1168 * No need for a recv reply status because the answer to the command is
1169 * the reply status message.
1170 */
1171
1172 ret = consumer_socket_recv(socket, &ret_code, sizeof(ret_code));
1173 if (ret < 0) {
1174 pthread_mutex_unlock(socket->lock);
1175 goto error_unlock;
1176 }
1177 pthread_mutex_unlock(socket->lock);
1178
1179 if (ret_code == 1) {
1180 break;
1181 }
1182 }
1183 rcu_read_unlock();
1184
1185 DBG("Consumer data is %s pending for session id %" PRIu64,
1186 ret_code == 1 ? "" : "NOT", session_id);
1187 return ret_code;
1188
1189 error_unlock:
1190 rcu_read_unlock();
1191 return -1;
1192 }
1193
1194 /*
1195 * Send a flush command to consumer using the given channel key.
1196 *
1197 * Return 0 on success else a negative value.
1198 */
1199 int consumer_flush_channel(struct consumer_socket *socket, uint64_t key)
1200 {
1201 int ret;
1202 struct lttcomm_consumer_msg msg;
1203
1204 assert(socket);
1205
1206 DBG2("Consumer flush channel key %" PRIu64, key);
1207
1208 memset(&msg, 0, sizeof(msg));
1209 msg.cmd_type = LTTNG_CONSUMER_FLUSH_CHANNEL;
1210 msg.u.flush_channel.key = key;
1211
1212 pthread_mutex_lock(socket->lock);
1213 health_code_update();
1214
1215 ret = consumer_send_msg(socket, &msg);
1216 if (ret < 0) {
1217 goto end;
1218 }
1219
1220 end:
1221 health_code_update();
1222 pthread_mutex_unlock(socket->lock);
1223 return ret;
1224 }
1225
1226 /*
1227 * Send a clear quiescent command to consumer using the given channel key.
1228 *
1229 * Return 0 on success else a negative value.
1230 */
1231 int consumer_clear_quiescent_channel(struct consumer_socket *socket, uint64_t key)
1232 {
1233 int ret;
1234 struct lttcomm_consumer_msg msg;
1235
1236 assert(socket);
1237
1238 DBG2("Consumer clear quiescent channel key %" PRIu64, key);
1239
1240 memset(&msg, 0, sizeof(msg));
1241 msg.cmd_type = LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL;
1242 msg.u.clear_quiescent_channel.key = key;
1243
1244 pthread_mutex_lock(socket->lock);
1245 health_code_update();
1246
1247 ret = consumer_send_msg(socket, &msg);
1248 if (ret < 0) {
1249 goto end;
1250 }
1251
1252 end:
1253 health_code_update();
1254 pthread_mutex_unlock(socket->lock);
1255 return ret;
1256 }
1257
1258 /*
1259 * Send a close metadata command to consumer using the given channel key.
1260 * Called with registry lock held.
1261 *
1262 * Return 0 on success else a negative value.
1263 */
1264 int consumer_close_metadata(struct consumer_socket *socket,
1265 uint64_t metadata_key)
1266 {
1267 int ret;
1268 struct lttcomm_consumer_msg msg;
1269
1270 assert(socket);
1271
1272 DBG2("Consumer close metadata channel key %" PRIu64, metadata_key);
1273
1274 memset(&msg, 0, sizeof(msg));
1275 msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
1276 msg.u.close_metadata.key = metadata_key;
1277
1278 pthread_mutex_lock(socket->lock);
1279 health_code_update();
1280
1281 ret = consumer_send_msg(socket, &msg);
1282 if (ret < 0) {
1283 goto end;
1284 }
1285
1286 end:
1287 health_code_update();
1288 pthread_mutex_unlock(socket->lock);
1289 return ret;
1290 }
1291
1292 /*
1293 * Send a setup metdata command to consumer using the given channel key.
1294 *
1295 * Return 0 on success else a negative value.
1296 */
1297 int consumer_setup_metadata(struct consumer_socket *socket,
1298 uint64_t metadata_key)
1299 {
1300 int ret;
1301 struct lttcomm_consumer_msg msg;
1302
1303 assert(socket);
1304
1305 DBG2("Consumer setup metadata channel key %" PRIu64, metadata_key);
1306
1307 memset(&msg, 0, sizeof(msg));
1308 msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
1309 msg.u.setup_metadata.key = metadata_key;
1310
1311 pthread_mutex_lock(socket->lock);
1312 health_code_update();
1313
1314 ret = consumer_send_msg(socket, &msg);
1315 if (ret < 0) {
1316 goto end;
1317 }
1318
1319 end:
1320 health_code_update();
1321 pthread_mutex_unlock(socket->lock);
1322 return ret;
1323 }
1324
1325 /*
1326 * Send metadata string to consumer.
1327 * RCU read-side lock must be held to guarantee existence of socket.
1328 *
1329 * Return 0 on success else a negative value.
1330 */
1331 int consumer_push_metadata(struct consumer_socket *socket,
1332 uint64_t metadata_key, char *metadata_str, size_t len,
1333 size_t target_offset, uint64_t version)
1334 {
1335 int ret;
1336 struct lttcomm_consumer_msg msg;
1337
1338 assert(socket);
1339
1340 DBG2("Consumer push metadata to consumer socket %d", *socket->fd_ptr);
1341
1342 pthread_mutex_lock(socket->lock);
1343
1344 memset(&msg, 0, sizeof(msg));
1345 msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
1346 msg.u.push_metadata.key = metadata_key;
1347 msg.u.push_metadata.target_offset = target_offset;
1348 msg.u.push_metadata.len = len;
1349 msg.u.push_metadata.version = version;
1350
1351 health_code_update();
1352 ret = consumer_send_msg(socket, &msg);
1353 if (ret < 0 || len == 0) {
1354 goto end;
1355 }
1356
1357 DBG3("Consumer pushing metadata on sock %d of len %zu", *socket->fd_ptr,
1358 len);
1359
1360 ret = consumer_socket_send(socket, metadata_str, len);
1361 if (ret < 0) {
1362 goto end;
1363 }
1364
1365 health_code_update();
1366 ret = consumer_recv_status_reply(socket);
1367 if (ret < 0) {
1368 goto end;
1369 }
1370
1371 end:
1372 pthread_mutex_unlock(socket->lock);
1373 health_code_update();
1374 return ret;
1375 }
1376
1377 /*
1378 * Ask the consumer to snapshot a specific channel using the key.
1379 *
1380 * Return 0 on success or else a negative error.
1381 */
1382 int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
1383 struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
1384 const char *session_path, int wait, uint64_t nb_packets_per_stream)
1385 {
1386 int ret;
1387 struct lttcomm_consumer_msg msg;
1388
1389 assert(socket);
1390 assert(output);
1391 assert(output->consumer);
1392
1393 DBG("Consumer snapshot channel key %" PRIu64, key);
1394
1395 memset(&msg, 0, sizeof(msg));
1396 msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL;
1397 msg.u.snapshot_channel.key = key;
1398 msg.u.snapshot_channel.nb_packets_per_stream = nb_packets_per_stream;
1399 msg.u.snapshot_channel.metadata = metadata;
1400
1401 if (output->consumer->type == CONSUMER_DST_NET) {
1402 msg.u.snapshot_channel.relayd_id = output->consumer->net_seq_index;
1403 msg.u.snapshot_channel.use_relayd = 1;
1404 ret = snprintf(msg.u.snapshot_channel.pathname,
1405 sizeof(msg.u.snapshot_channel.pathname),
1406 "%s/%s-%s-%" PRIu64 "%s", output->consumer->subdir,
1407 output->name, output->datetime, output->nb_snapshot,
1408 session_path);
1409 if (ret < 0) {
1410 ret = -LTTNG_ERR_NOMEM;
1411 goto error;
1412 }
1413 } else {
1414 ret = snprintf(msg.u.snapshot_channel.pathname,
1415 sizeof(msg.u.snapshot_channel.pathname),
1416 "%s/%s-%s-%" PRIu64 "%s", output->consumer->dst.trace_path,
1417 output->name, output->datetime, output->nb_snapshot,
1418 session_path);
1419 if (ret < 0) {
1420 ret = -LTTNG_ERR_NOMEM;
1421 goto error;
1422 }
1423 msg.u.snapshot_channel.relayd_id = (uint64_t) -1ULL;
1424
1425 /* Create directory. Ignore if exist. */
1426 ret = run_as_mkdir_recursive(msg.u.snapshot_channel.pathname,
1427 S_IRWXU | S_IRWXG, uid, gid);
1428 if (ret < 0) {
1429 if (errno != EEXIST) {
1430 ERR("Trace directory creation error");
1431 goto error;
1432 }
1433 }
1434 }
1435
1436 health_code_update();
1437 ret = consumer_send_msg(socket, &msg);
1438 if (ret < 0) {
1439 goto error;
1440 }
1441
1442 error:
1443 health_code_update();
1444 return ret;
1445 }
1446
1447 /*
1448 * Ask the consumer the number of discarded events for a channel.
1449 */
1450 int consumer_get_discarded_events(uint64_t session_id, uint64_t channel_key,
1451 struct consumer_output *consumer, uint64_t *discarded)
1452 {
1453 int ret;
1454 struct consumer_socket *socket;
1455 struct lttng_ht_iter iter;
1456 struct lttcomm_consumer_msg msg;
1457
1458 assert(consumer);
1459
1460 DBG3("Consumer discarded events id %" PRIu64, session_id);
1461
1462 memset(&msg, 0, sizeof(msg));
1463 msg.cmd_type = LTTNG_CONSUMER_DISCARDED_EVENTS;
1464 msg.u.discarded_events.session_id = session_id;
1465 msg.u.discarded_events.channel_key = channel_key;
1466
1467 *discarded = 0;
1468
1469 /* Send command for each consumer */
1470 rcu_read_lock();
1471 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
1472 node.node) {
1473 uint64_t consumer_discarded = 0;
1474 pthread_mutex_lock(socket->lock);
1475 ret = consumer_socket_send(socket, &msg, sizeof(msg));
1476 if (ret < 0) {
1477 pthread_mutex_unlock(socket->lock);
1478 goto end;
1479 }
1480
1481 /*
1482 * No need for a recv reply status because the answer to the
1483 * command is the reply status message.
1484 */
1485 ret = consumer_socket_recv(socket, &consumer_discarded,
1486 sizeof(consumer_discarded));
1487 if (ret < 0) {
1488 ERR("get discarded events");
1489 pthread_mutex_unlock(socket->lock);
1490 goto end;
1491 }
1492 pthread_mutex_unlock(socket->lock);
1493 *discarded += consumer_discarded;
1494 }
1495 ret = 0;
1496 DBG("Consumer discarded %" PRIu64 " events in session id %" PRIu64,
1497 *discarded, session_id);
1498
1499 end:
1500 rcu_read_unlock();
1501 return ret;
1502 }
1503
1504 /*
1505 * Ask the consumer the number of lost packets for a channel.
1506 */
1507 int consumer_get_lost_packets(uint64_t session_id, uint64_t channel_key,
1508 struct consumer_output *consumer, uint64_t *lost)
1509 {
1510 int ret;
1511 struct consumer_socket *socket;
1512 struct lttng_ht_iter iter;
1513 struct lttcomm_consumer_msg msg;
1514
1515 assert(consumer);
1516
1517 DBG3("Consumer lost packets id %" PRIu64, session_id);
1518
1519 memset(&msg, 0, sizeof(msg));
1520 msg.cmd_type = LTTNG_CONSUMER_LOST_PACKETS;
1521 msg.u.lost_packets.session_id = session_id;
1522 msg.u.lost_packets.channel_key = channel_key;
1523
1524 *lost = 0;
1525
1526 /* Send command for each consumer */
1527 rcu_read_lock();
1528 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
1529 node.node) {
1530 uint64_t consumer_lost = 0;
1531 pthread_mutex_lock(socket->lock);
1532 ret = consumer_socket_send(socket, &msg, sizeof(msg));
1533 if (ret < 0) {
1534 pthread_mutex_unlock(socket->lock);
1535 goto end;
1536 }
1537
1538 /*
1539 * No need for a recv reply status because the answer to the
1540 * command is the reply status message.
1541 */
1542 ret = consumer_socket_recv(socket, &consumer_lost,
1543 sizeof(consumer_lost));
1544 if (ret < 0) {
1545 ERR("get lost packets");
1546 pthread_mutex_unlock(socket->lock);
1547 goto end;
1548 }
1549 pthread_mutex_unlock(socket->lock);
1550 *lost += consumer_lost;
1551 }
1552 ret = 0;
1553 DBG("Consumer lost %" PRIu64 " packets in session id %" PRIu64,
1554 *lost, session_id);
1555
1556 end:
1557 rcu_read_unlock();
1558 return ret;
1559 }
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