6c1dbcd36763f5c7309ab4e5b08d12c1fd528860
[lttng-tools.git] / src / bin / lttng-relayd / live.c
1 /*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #define _LGPL_SOURCE
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/mman.h>
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <inttypes.h>
37 #include <urcu/futex.h>
38 #include <urcu/uatomic.h>
39 #include <urcu/rculist.h>
40 #include <unistd.h>
41 #include <fcntl.h>
42
43 #include <lttng/lttng.h>
44 #include <common/common.h>
45 #include <common/compat/poll.h>
46 #include <common/compat/socket.h>
47 #include <common/compat/endian.h>
48 #include <common/defaults.h>
49 #include <common/futex.h>
50 #include <common/index/index.h>
51 #include <common/sessiond-comm/sessiond-comm.h>
52 #include <common/sessiond-comm/inet.h>
53 #include <common/sessiond-comm/relayd.h>
54 #include <common/uri.h>
55 #include <common/utils.h>
56
57 #include "cmd.h"
58 #include "live.h"
59 #include "lttng-relayd.h"
60 #include "utils.h"
61 #include "health-relayd.h"
62 #include "testpoint.h"
63 #include "viewer-stream.h"
64 #include "stream.h"
65 #include "session.h"
66 #include "ctf-trace.h"
67 #include "connection.h"
68 #include "viewer-session.h"
69
70 #define SESSION_BUF_DEFAULT_COUNT 16
71
72 static struct lttng_uri *live_uri;
73
74 /*
75 * This pipe is used to inform the worker thread that a command is queued and
76 * ready to be processed.
77 */
78 static int live_conn_pipe[2] = { -1, -1 };
79
80 /* Shared between threads */
81 static int live_dispatch_thread_exit;
82
83 static pthread_t live_listener_thread;
84 static pthread_t live_dispatcher_thread;
85 static pthread_t live_worker_thread;
86
87 /*
88 * Relay command queue.
89 *
90 * The live_thread_listener and live_thread_dispatcher communicate with this
91 * queue.
92 */
93 static struct relay_conn_queue viewer_conn_queue;
94
95 static uint64_t last_relay_viewer_session_id;
96 static pthread_mutex_t last_relay_viewer_session_id_lock =
97 PTHREAD_MUTEX_INITIALIZER;
98
99 /*
100 * Cleanup the daemon
101 */
102 static
103 void cleanup_relayd_live(void)
104 {
105 DBG("Cleaning up");
106
107 free(live_uri);
108 }
109
110 /*
111 * Receive a request buffer using a given socket, destination allocated buffer
112 * of length size.
113 *
114 * Return the size of the received message or else a negative value on error
115 * with errno being set by recvmsg() syscall.
116 */
117 static
118 ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size)
119 {
120 ssize_t ret;
121
122 ret = sock->ops->recvmsg(sock, buf, size, 0);
123 if (ret < 0 || ret != size) {
124 if (ret == 0) {
125 /* Orderly shutdown. Not necessary to print an error. */
126 DBG("Socket %d did an orderly shutdown", sock->fd);
127 } else {
128 ERR("Relay failed to receive request.");
129 }
130 ret = -1;
131 }
132
133 return ret;
134 }
135
136 /*
137 * Send a response buffer using a given socket, source allocated buffer of
138 * length size.
139 *
140 * Return the size of the sent message or else a negative value on error with
141 * errno being set by sendmsg() syscall.
142 */
143 static
144 ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size)
145 {
146 ssize_t ret;
147
148 ret = sock->ops->sendmsg(sock, buf, size, 0);
149 if (ret < 0) {
150 ERR("Relayd failed to send response.");
151 }
152
153 return ret;
154 }
155
156 /*
157 * Atomically check if new streams got added in one of the sessions attached
158 * and reset the flag to 0.
159 *
160 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
161 * on error.
162 */
163 static
164 int check_new_streams(struct relay_connection *conn)
165 {
166 struct relay_session *session;
167 unsigned long current_val;
168 int ret = 0;
169
170 if (!conn->viewer_session) {
171 goto end;
172 }
173 rcu_read_lock();
174 cds_list_for_each_entry_rcu(session,
175 &conn->viewer_session->session_list,
176 viewer_session_node) {
177 if (!session_get(session)) {
178 continue;
179 }
180 current_val = uatomic_cmpxchg(&session->new_streams, 1, 0);
181 ret = current_val;
182 session_put(session);
183 if (ret == 1) {
184 goto end;
185 }
186 }
187 end:
188 rcu_read_unlock();
189 return ret;
190 }
191
192 /*
193 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
194 * this function should ignore the sent flag or not.
195 *
196 * Return 0 on success or else a negative value.
197 */
198 static
199 ssize_t send_viewer_streams(struct lttcomm_sock *sock,
200 uint64_t session_id, unsigned int ignore_sent_flag)
201 {
202 ssize_t ret;
203 struct lttng_viewer_stream send_stream;
204 struct lttng_ht_iter iter;
205 struct relay_viewer_stream *vstream;
206
207 rcu_read_lock();
208
209 cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
210 stream_n.node) {
211 struct ctf_trace *ctf_trace;
212
213 health_code_update();
214
215 if (!viewer_stream_get(vstream)) {
216 continue;
217 }
218
219 pthread_mutex_lock(&vstream->stream->lock);
220 /* Ignore if not the same session. */
221 if (vstream->stream->trace->session->id != session_id ||
222 (!ignore_sent_flag && vstream->sent_flag)) {
223 pthread_mutex_unlock(&vstream->stream->lock);
224 viewer_stream_put(vstream);
225 continue;
226 }
227
228 ctf_trace = vstream->stream->trace;
229 send_stream.id = htobe64(vstream->stream->stream_handle);
230 send_stream.ctf_trace_id = htobe64(ctf_trace->id);
231 send_stream.metadata_flag = htobe32(
232 vstream->stream->is_metadata);
233 if (lttng_strncpy(send_stream.path_name, vstream->path_name,
234 sizeof(send_stream.path_name))) {
235 pthread_mutex_unlock(&vstream->stream->lock);
236 viewer_stream_put(vstream);
237 ret = -1; /* Error. */
238 goto end_unlock;
239 }
240 if (lttng_strncpy(send_stream.channel_name,
241 vstream->channel_name,
242 sizeof(send_stream.channel_name))) {
243 pthread_mutex_unlock(&vstream->stream->lock);
244 viewer_stream_put(vstream);
245 ret = -1; /* Error. */
246 goto end_unlock;
247 }
248
249 DBG("Sending stream %" PRIu64 " to viewer",
250 vstream->stream->stream_handle);
251 vstream->sent_flag = 1;
252 pthread_mutex_unlock(&vstream->stream->lock);
253
254 ret = send_response(sock, &send_stream, sizeof(send_stream));
255 viewer_stream_put(vstream);
256 if (ret < 0) {
257 goto end_unlock;
258 }
259 }
260
261 ret = 0;
262
263 end_unlock:
264 rcu_read_unlock();
265 return ret;
266 }
267
268 /*
269 * Create every viewer stream possible for the given session with the seek
270 * type. Three counters *can* be return which are in order the total amount of
271 * viewer stream of the session, the number of unsent stream and the number of
272 * stream created. Those counters can be NULL and thus will be ignored.
273 *
274 * session must be locked to ensure that we see either none or all initial
275 * streams for a session, but no intermediate state..
276 *
277 * Return 0 on success or else a negative value.
278 */
279 static int make_viewer_streams(struct relay_session *session,
280 struct lttng_trace_chunk *viewer_trace_chunk,
281 enum lttng_viewer_seek seek_t,
282 uint32_t *nb_total,
283 uint32_t *nb_unsent,
284 uint32_t *nb_created,
285 bool *closed)
286 {
287 int ret;
288 struct lttng_ht_iter iter;
289 struct ctf_trace *ctf_trace;
290
291 assert(session);
292 ASSERT_LOCKED(session->lock);
293
294 if (!viewer_trace_chunk) {
295 ERR("Internal error: viewer session associated with session \"%s\" has a NULL trace chunk",
296 session->session_name);
297 ret = -1;
298 goto error;
299 }
300
301 if (session->connection_closed) {
302 *closed = true;
303 }
304
305 /*
306 * Create viewer streams for relay streams that are ready to be
307 * used for a the given session id only.
308 */
309 rcu_read_lock();
310 cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace,
311 node.node) {
312 bool trace_has_metadata_stream = false;
313 struct relay_stream *stream;
314
315 health_code_update();
316
317 if (!ctf_trace_get(ctf_trace)) {
318 continue;
319 }
320
321 /*
322 * Iterate over all the streams of the trace to see if we have a
323 * metadata stream.
324 */
325 cds_list_for_each_entry_rcu(
326 stream, &ctf_trace->stream_list, stream_node)
327 {
328 if (stream->is_metadata) {
329 trace_has_metadata_stream = true;
330 break;
331 }
332 }
333
334 /*
335 * If there is no metadata stream in this trace at the moment
336 * and we never sent one to the viewer, skip the trace. We
337 * accept that the viewer will not see this trace at all.
338 */
339 if (!trace_has_metadata_stream &&
340 !ctf_trace->metadata_stream_sent_to_viewer) {
341 break;
342 }
343
344 cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) {
345 struct relay_viewer_stream *vstream;
346
347 if (!stream_get(stream)) {
348 continue;
349 }
350 /*
351 * stream published is protected by the session lock.
352 */
353 if (!stream->published) {
354 goto next;
355 }
356 vstream = viewer_stream_get_by_id(stream->stream_handle);
357 if (!vstream) {
358 /*
359 * Save that we sent the metadata stream to the
360 * viewer. So that we know what trace the viewer
361 * is aware of.
362 */
363 if (stream->is_metadata) {
364 ctf_trace->metadata_stream_sent_to_viewer =
365 true;
366 }
367 vstream = viewer_stream_create(stream,
368 viewer_trace_chunk, seek_t);
369 if (!vstream) {
370 ret = -1;
371 ctf_trace_put(ctf_trace);
372 stream_put(stream);
373 goto error_unlock;
374 }
375
376 if (nb_created) {
377 /* Update number of created stream counter. */
378 (*nb_created)++;
379 }
380 /*
381 * Ensure a self-reference is preserved even
382 * after we have put our local reference.
383 */
384 if (!viewer_stream_get(vstream)) {
385 ERR("Unable to get self-reference on viewer stream, logic error.");
386 abort();
387 }
388 } else {
389 if (!vstream->sent_flag && nb_unsent) {
390 /* Update number of unsent stream counter. */
391 (*nb_unsent)++;
392 }
393 }
394 /* Update number of total stream counter. */
395 if (nb_total) {
396 if (stream->is_metadata) {
397 if (!stream->closed ||
398 stream->metadata_received > vstream->metadata_sent) {
399 (*nb_total)++;
400 }
401 } else {
402 if (!stream->closed ||
403 !(((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) >= 0)) {
404
405 (*nb_total)++;
406 }
407 }
408 }
409 /* Put local reference. */
410 viewer_stream_put(vstream);
411 next:
412 stream_put(stream);
413 }
414 ctf_trace_put(ctf_trace);
415 }
416
417 ret = 0;
418
419 error_unlock:
420 rcu_read_unlock();
421 error:
422 return ret;
423 }
424
425 int relayd_live_stop(void)
426 {
427 /* Stop dispatch thread */
428 CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
429 futex_nto1_wake(&viewer_conn_queue.futex);
430 return 0;
431 }
432
433 /*
434 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
435 */
436 static
437 int create_thread_poll_set(struct lttng_poll_event *events, int size)
438 {
439 int ret;
440
441 if (events == NULL || size == 0) {
442 ret = -1;
443 goto error;
444 }
445
446 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
447 if (ret < 0) {
448 goto error;
449 }
450
451 /* Add quit pipe */
452 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
453 if (ret < 0) {
454 goto error;
455 }
456
457 return 0;
458
459 error:
460 return ret;
461 }
462
463 /*
464 * Check if the thread quit pipe was triggered.
465 *
466 * Return 1 if it was triggered else 0;
467 */
468 static
469 int check_thread_quit_pipe(int fd, uint32_t events)
470 {
471 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
472 return 1;
473 }
474
475 return 0;
476 }
477
478 /*
479 * Create and init socket from uri.
480 */
481 static
482 struct lttcomm_sock *init_socket(struct lttng_uri *uri)
483 {
484 int ret;
485 struct lttcomm_sock *sock = NULL;
486
487 sock = lttcomm_alloc_sock_from_uri(uri);
488 if (sock == NULL) {
489 ERR("Allocating socket");
490 goto error;
491 }
492
493 ret = lttcomm_create_sock(sock);
494 if (ret < 0) {
495 goto error;
496 }
497 DBG("Listening on sock %d for lttng-live", sock->fd);
498
499 ret = sock->ops->bind(sock);
500 if (ret < 0) {
501 PERROR("Failed to bind lttng-live socket");
502 goto error;
503 }
504
505 ret = sock->ops->listen(sock, -1);
506 if (ret < 0) {
507 goto error;
508
509 }
510
511 return sock;
512
513 error:
514 if (sock) {
515 lttcomm_destroy_sock(sock);
516 }
517 return NULL;
518 }
519
520 /*
521 * This thread manages the listening for new connections on the network
522 */
523 static
524 void *thread_listener(void *data)
525 {
526 int i, ret, pollfd, err = -1;
527 uint32_t revents, nb_fd;
528 struct lttng_poll_event events;
529 struct lttcomm_sock *live_control_sock;
530
531 DBG("[thread] Relay live listener started");
532
533 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER);
534
535 health_code_update();
536
537 live_control_sock = init_socket(live_uri);
538 if (!live_control_sock) {
539 goto error_sock_control;
540 }
541
542 /* Pass 2 as size here for the thread quit pipe and control sockets. */
543 ret = create_thread_poll_set(&events, 2);
544 if (ret < 0) {
545 goto error_create_poll;
546 }
547
548 /* Add the control socket */
549 ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP);
550 if (ret < 0) {
551 goto error_poll_add;
552 }
553
554 lttng_relay_notify_ready();
555
556 if (testpoint(relayd_thread_live_listener)) {
557 goto error_testpoint;
558 }
559
560 while (1) {
561 health_code_update();
562
563 DBG("Listener accepting live viewers connections");
564
565 restart:
566 health_poll_entry();
567 ret = lttng_poll_wait(&events, -1);
568 health_poll_exit();
569 if (ret < 0) {
570 /*
571 * Restart interrupted system call.
572 */
573 if (errno == EINTR) {
574 goto restart;
575 }
576 goto error;
577 }
578 nb_fd = ret;
579
580 DBG("Relay new viewer connection received");
581 for (i = 0; i < nb_fd; i++) {
582 health_code_update();
583
584 /* Fetch once the poll data */
585 revents = LTTNG_POLL_GETEV(&events, i);
586 pollfd = LTTNG_POLL_GETFD(&events, i);
587
588 /* Thread quit pipe has been closed. Killing thread. */
589 ret = check_thread_quit_pipe(pollfd, revents);
590 if (ret) {
591 err = 0;
592 goto exit;
593 }
594
595 if (revents & LPOLLIN) {
596 /*
597 * A new connection is requested, therefore a
598 * viewer connection is allocated in this
599 * thread, enqueued to a global queue and
600 * dequeued (and freed) in the worker thread.
601 */
602 int val = 1;
603 struct relay_connection *new_conn;
604 struct lttcomm_sock *newsock;
605
606 newsock = live_control_sock->ops->accept(live_control_sock);
607 if (!newsock) {
608 PERROR("accepting control sock");
609 goto error;
610 }
611 DBG("Relay viewer connection accepted socket %d", newsock->fd);
612
613 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
614 sizeof(val));
615 if (ret < 0) {
616 PERROR("setsockopt inet");
617 lttcomm_destroy_sock(newsock);
618 goto error;
619 }
620 new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN);
621 if (!new_conn) {
622 lttcomm_destroy_sock(newsock);
623 goto error;
624 }
625 /* Ownership assumed by the connection. */
626 newsock = NULL;
627
628 /* Enqueue request for the dispatcher thread. */
629 cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail,
630 &new_conn->qnode);
631
632 /*
633 * Wake the dispatch queue futex.
634 * Implicit memory barrier with the
635 * exchange in cds_wfcq_enqueue.
636 */
637 futex_nto1_wake(&viewer_conn_queue.futex);
638 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
639 ERR("socket poll error");
640 goto error;
641 } else {
642 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
643 goto error;
644 }
645 }
646 }
647
648 exit:
649 error:
650 error_poll_add:
651 error_testpoint:
652 lttng_poll_clean(&events);
653 error_create_poll:
654 if (live_control_sock->fd >= 0) {
655 ret = live_control_sock->ops->close(live_control_sock);
656 if (ret) {
657 PERROR("close");
658 }
659 }
660 lttcomm_destroy_sock(live_control_sock);
661 error_sock_control:
662 if (err) {
663 health_error();
664 DBG("Live viewer listener thread exited with error");
665 }
666 health_unregister(health_relayd);
667 DBG("Live viewer listener thread cleanup complete");
668 if (lttng_relay_stop_threads()) {
669 ERR("Error stopping threads");
670 }
671 return NULL;
672 }
673
674 /*
675 * This thread manages the dispatching of the requests to worker threads
676 */
677 static
678 void *thread_dispatcher(void *data)
679 {
680 int err = -1;
681 ssize_t ret;
682 struct cds_wfcq_node *node;
683 struct relay_connection *conn = NULL;
684
685 DBG("[thread] Live viewer relay dispatcher started");
686
687 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER);
688
689 if (testpoint(relayd_thread_live_dispatcher)) {
690 goto error_testpoint;
691 }
692
693 health_code_update();
694
695 for (;;) {
696 health_code_update();
697
698 /* Atomically prepare the queue futex */
699 futex_nto1_prepare(&viewer_conn_queue.futex);
700
701 if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) {
702 break;
703 }
704
705 do {
706 health_code_update();
707
708 /* Dequeue commands */
709 node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head,
710 &viewer_conn_queue.tail);
711 if (node == NULL) {
712 DBG("Woken up but nothing in the live-viewer "
713 "relay command queue");
714 /* Continue thread execution */
715 break;
716 }
717 conn = caa_container_of(node, struct relay_connection, qnode);
718 DBG("Dispatching viewer request waiting on sock %d",
719 conn->sock->fd);
720
721 /*
722 * Inform worker thread of the new request. This
723 * call is blocking so we can be assured that
724 * the data will be read at some point in time
725 * or wait to the end of the world :)
726 */
727 ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn));
728 if (ret < 0) {
729 PERROR("write conn pipe");
730 connection_put(conn);
731 goto error;
732 }
733 } while (node != NULL);
734
735 /* Futex wait on queue. Blocking call on futex() */
736 health_poll_entry();
737 futex_nto1_wait(&viewer_conn_queue.futex);
738 health_poll_exit();
739 }
740
741 /* Normal exit, no error */
742 err = 0;
743
744 error:
745 error_testpoint:
746 if (err) {
747 health_error();
748 ERR("Health error occurred in %s", __func__);
749 }
750 health_unregister(health_relayd);
751 DBG("Live viewer dispatch thread dying");
752 if (lttng_relay_stop_threads()) {
753 ERR("Error stopping threads");
754 }
755 return NULL;
756 }
757
758 /*
759 * Establish connection with the viewer and check the versions.
760 *
761 * Return 0 on success or else negative value.
762 */
763 static
764 int viewer_connect(struct relay_connection *conn)
765 {
766 int ret;
767 struct lttng_viewer_connect reply, msg;
768
769 conn->version_check_done = 1;
770
771 health_code_update();
772
773 DBG("Viewer is establishing a connection to the relayd.");
774
775 ret = recv_request(conn->sock, &msg, sizeof(msg));
776 if (ret < 0) {
777 goto end;
778 }
779
780 health_code_update();
781
782 memset(&reply, 0, sizeof(reply));
783 reply.major = RELAYD_VERSION_COMM_MAJOR;
784 reply.minor = RELAYD_VERSION_COMM_MINOR;
785
786 /* Major versions must be the same */
787 if (reply.major != be32toh(msg.major)) {
788 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
789 reply.major, be32toh(msg.major));
790 ret = -1;
791 goto end;
792 }
793
794 conn->major = reply.major;
795 /* We adapt to the lowest compatible version */
796 if (reply.minor <= be32toh(msg.minor)) {
797 conn->minor = reply.minor;
798 } else {
799 conn->minor = be32toh(msg.minor);
800 }
801
802 if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) {
803 conn->type = RELAY_VIEWER_COMMAND;
804 } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) {
805 conn->type = RELAY_VIEWER_NOTIFICATION;
806 } else {
807 ERR("Unknown connection type : %u", be32toh(msg.type));
808 ret = -1;
809 goto end;
810 }
811
812 reply.major = htobe32(reply.major);
813 reply.minor = htobe32(reply.minor);
814 if (conn->type == RELAY_VIEWER_COMMAND) {
815 /*
816 * Increment outside of htobe64 macro, because the argument can
817 * be used more than once within the macro, and thus the
818 * operation may be undefined.
819 */
820 pthread_mutex_lock(&last_relay_viewer_session_id_lock);
821 last_relay_viewer_session_id++;
822 pthread_mutex_unlock(&last_relay_viewer_session_id_lock);
823 reply.viewer_session_id = htobe64(last_relay_viewer_session_id);
824 }
825
826 health_code_update();
827
828 ret = send_response(conn->sock, &reply, sizeof(reply));
829 if (ret < 0) {
830 goto end;
831 }
832
833 health_code_update();
834
835 DBG("Version check done using protocol %u.%u", conn->major, conn->minor);
836 ret = 0;
837
838 end:
839 return ret;
840 }
841
842 /*
843 * Send the viewer the list of current sessions.
844 * We need to create a copy of the hash table content because otherwise
845 * we cannot assume the number of entries stays the same between getting
846 * the number of HT elements and iteration over the HT.
847 *
848 * Return 0 on success or else a negative value.
849 */
850 static
851 int viewer_list_sessions(struct relay_connection *conn)
852 {
853 int ret = 0;
854 struct lttng_viewer_list_sessions session_list;
855 struct lttng_ht_iter iter;
856 struct relay_session *session;
857 struct lttng_viewer_session *send_session_buf = NULL;
858 uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT;
859 uint32_t count = 0;
860
861 DBG("List sessions received");
862
863 send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf));
864 if (!send_session_buf) {
865 return -1;
866 }
867
868 rcu_read_lock();
869 cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
870 session_n.node) {
871 struct lttng_viewer_session *send_session;
872
873 health_code_update();
874
875 pthread_mutex_lock(&session->lock);
876 if (session->connection_closed) {
877 /* Skip closed session */
878 goto next_session;
879 }
880 if (!session->current_trace_chunk) {
881 /*
882 * Skip un-attachable session. It is either
883 * being destroyed or has not had a trace
884 * chunk created against it yet.
885 */
886 goto next_session;
887 }
888
889 if (count >= buf_count) {
890 struct lttng_viewer_session *newbuf;
891 uint32_t new_buf_count = buf_count << 1;
892
893 newbuf = realloc(send_session_buf,
894 new_buf_count * sizeof(*send_session_buf));
895 if (!newbuf) {
896 ret = -1;
897 goto break_loop;
898 }
899 send_session_buf = newbuf;
900 buf_count = new_buf_count;
901 }
902 send_session = &send_session_buf[count];
903 if (lttng_strncpy(send_session->session_name,
904 session->session_name,
905 sizeof(send_session->session_name))) {
906 ret = -1;
907 goto break_loop;
908 }
909 if (lttng_strncpy(send_session->hostname, session->hostname,
910 sizeof(send_session->hostname))) {
911 ret = -1;
912 goto break_loop;
913 }
914 send_session->id = htobe64(session->id);
915 send_session->live_timer = htobe32(session->live_timer);
916 if (session->viewer_attached) {
917 send_session->clients = htobe32(1);
918 } else {
919 send_session->clients = htobe32(0);
920 }
921 send_session->streams = htobe32(session->stream_count);
922 count++;
923 next_session:
924 pthread_mutex_unlock(&session->lock);
925 continue;
926 break_loop:
927 pthread_mutex_unlock(&session->lock);
928 break;
929 }
930 rcu_read_unlock();
931 if (ret < 0) {
932 goto end_free;
933 }
934
935 session_list.sessions_count = htobe32(count);
936
937 health_code_update();
938
939 ret = send_response(conn->sock, &session_list, sizeof(session_list));
940 if (ret < 0) {
941 goto end_free;
942 }
943
944 health_code_update();
945
946 ret = send_response(conn->sock, send_session_buf,
947 count * sizeof(*send_session_buf));
948 if (ret < 0) {
949 goto end_free;
950 }
951 health_code_update();
952
953 ret = 0;
954 end_free:
955 free(send_session_buf);
956 return ret;
957 }
958
959 /*
960 * Send the viewer the list of current streams.
961 */
962 static
963 int viewer_get_new_streams(struct relay_connection *conn)
964 {
965 int ret, send_streams = 0;
966 uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0;
967 struct lttng_viewer_new_streams_request request;
968 struct lttng_viewer_new_streams_response response;
969 struct relay_session *session = NULL;
970 uint64_t session_id;
971 bool closed = false;
972
973 assert(conn);
974
975 DBG("Get new streams received");
976
977 health_code_update();
978
979 /* Receive the request from the connected client. */
980 ret = recv_request(conn->sock, &request, sizeof(request));
981 if (ret < 0) {
982 goto error;
983 }
984 session_id = be64toh(request.session_id);
985
986 health_code_update();
987
988 memset(&response, 0, sizeof(response));
989
990 session = session_get_by_id(session_id);
991 if (!session) {
992 DBG("Relay session %" PRIu64 " not found", session_id);
993 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
994 goto send_reply;
995 }
996
997 if (!viewer_session_is_attached(conn->viewer_session, session)) {
998 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
999 goto send_reply;
1000 }
1001
1002 pthread_mutex_lock(&session->lock);
1003 ret = make_viewer_streams(session,
1004 conn->viewer_session->current_trace_chunk,
1005 LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent,
1006 &nb_created, &closed);
1007 if (ret < 0) {
1008 goto error_unlock_session;
1009 }
1010 send_streams = 1;
1011 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
1012
1013 /* Only send back the newly created streams with the unsent ones. */
1014 nb_streams = nb_created + nb_unsent;
1015 response.streams_count = htobe32(nb_streams);
1016
1017 /*
1018 * If the session is closed, HUP when there are no more streams
1019 * with data.
1020 */
1021 if (closed && nb_total == 0) {
1022 send_streams = 0;
1023 response.streams_count = 0;
1024 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
1025 goto send_reply_unlock;
1026 }
1027 send_reply_unlock:
1028 pthread_mutex_unlock(&session->lock);
1029
1030 send_reply:
1031 health_code_update();
1032 ret = send_response(conn->sock, &response, sizeof(response));
1033 if (ret < 0) {
1034 goto end_put_session;
1035 }
1036 health_code_update();
1037
1038 /*
1039 * Unknown or empty session, just return gracefully, the viewer
1040 * knows what is happening.
1041 */
1042 if (!send_streams || !nb_streams) {
1043 ret = 0;
1044 goto end_put_session;
1045 }
1046
1047 /*
1048 * Send stream and *DON'T* ignore the sent flag so every viewer
1049 * streams that were not sent from that point will be sent to
1050 * the viewer.
1051 */
1052 ret = send_viewer_streams(conn->sock, session_id, 0);
1053 if (ret < 0) {
1054 goto end_put_session;
1055 }
1056
1057 end_put_session:
1058 if (session) {
1059 session_put(session);
1060 }
1061 error:
1062 return ret;
1063 error_unlock_session:
1064 pthread_mutex_unlock(&session->lock);
1065 session_put(session);
1066 return ret;
1067 }
1068
1069 /*
1070 * Send the viewer the list of current sessions.
1071 */
1072 static
1073 int viewer_attach_session(struct relay_connection *conn)
1074 {
1075 int send_streams = 0;
1076 ssize_t ret;
1077 uint32_t nb_streams = 0;
1078 enum lttng_viewer_seek seek_type;
1079 struct lttng_viewer_attach_session_request request;
1080 struct lttng_viewer_attach_session_response response;
1081 struct relay_session *session = NULL;
1082 enum lttng_viewer_attach_return_code viewer_attach_status;
1083 bool closed = false;
1084 uint64_t session_id;
1085
1086 assert(conn);
1087
1088 health_code_update();
1089
1090 /* Receive the request from the connected client. */
1091 ret = recv_request(conn->sock, &request, sizeof(request));
1092 if (ret < 0) {
1093 goto error;
1094 }
1095
1096 session_id = be64toh(request.session_id);
1097 health_code_update();
1098
1099 memset(&response, 0, sizeof(response));
1100
1101 if (!conn->viewer_session) {
1102 DBG("Client trying to attach before creating a live viewer session");
1103 response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION);
1104 goto send_reply;
1105 }
1106
1107 session = session_get_by_id(session_id);
1108 if (!session) {
1109 DBG("Relay session %" PRIu64 " not found", session_id);
1110 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
1111 goto send_reply;
1112 }
1113 DBG("Attach session ID %" PRIu64 " received", session_id);
1114
1115 pthread_mutex_lock(&session->lock);
1116 if (!session->current_trace_chunk) {
1117 /*
1118 * Session is either being destroyed or it never had a trace
1119 * chunk created against it.
1120 */
1121 DBG("Session requested by live client has no current trace chunk, returning unknown session");
1122 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
1123 goto send_reply;
1124 }
1125 if (session->live_timer == 0) {
1126 DBG("Not live session");
1127 response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE);
1128 goto send_reply;
1129 }
1130
1131 send_streams = 1;
1132 viewer_attach_status = viewer_session_attach(conn->viewer_session,
1133 session);
1134 if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) {
1135 response.status = htobe32(viewer_attach_status);
1136 goto send_reply;
1137 }
1138
1139 switch (be32toh(request.seek)) {
1140 case LTTNG_VIEWER_SEEK_BEGINNING:
1141 case LTTNG_VIEWER_SEEK_LAST:
1142 response.status = htobe32(LTTNG_VIEWER_ATTACH_OK);
1143 seek_type = be32toh(request.seek);
1144 break;
1145 default:
1146 ERR("Wrong seek parameter");
1147 response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR);
1148 send_streams = 0;
1149 goto send_reply;
1150 }
1151
1152 ret = make_viewer_streams(session,
1153 conn->viewer_session->current_trace_chunk, seek_type,
1154 &nb_streams, NULL, NULL, &closed);
1155 if (ret < 0) {
1156 goto end_put_session;
1157 }
1158 pthread_mutex_unlock(&session->lock);
1159 session_put(session);
1160 session = NULL;
1161
1162 response.streams_count = htobe32(nb_streams);
1163 /*
1164 * If the session is closed when the viewer is attaching, it
1165 * means some of the streams may have been concurrently removed,
1166 * so we don't allow the viewer to attach, even if there are
1167 * streams available.
1168 */
1169 if (closed) {
1170 send_streams = 0;
1171 response.streams_count = 0;
1172 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
1173 goto send_reply;
1174 }
1175
1176 send_reply:
1177 health_code_update();
1178 ret = send_response(conn->sock, &response, sizeof(response));
1179 if (ret < 0) {
1180 goto end_put_session;
1181 }
1182 health_code_update();
1183
1184 /*
1185 * Unknown or empty session, just return gracefully, the viewer
1186 * knows what is happening.
1187 */
1188 if (!send_streams || !nb_streams) {
1189 ret = 0;
1190 goto end_put_session;
1191 }
1192
1193 /* Send stream and ignore the sent flag. */
1194 ret = send_viewer_streams(conn->sock, session_id, 1);
1195 if (ret < 0) {
1196 goto end_put_session;
1197 }
1198
1199 end_put_session:
1200 if (session) {
1201 pthread_mutex_unlock(&session->lock);
1202 session_put(session);
1203 }
1204 error:
1205 return ret;
1206 }
1207
1208 /*
1209 * Open the index file if needed for the given vstream.
1210 *
1211 * If an index file is successfully opened, the vstream will set it as its
1212 * current index file.
1213 *
1214 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1215 *
1216 * Called with rstream lock held.
1217 */
1218 static int try_open_index(struct relay_viewer_stream *vstream,
1219 struct relay_stream *rstream)
1220 {
1221 int ret = 0;
1222 const uint32_t connection_major = rstream->trace->session->major;
1223 const uint32_t connection_minor = rstream->trace->session->minor;
1224
1225 if (vstream->index_file) {
1226 goto end;
1227 }
1228
1229 /*
1230 * First time, we open the index file and at least one index is ready.
1231 */
1232 if (rstream->index_received_seqcount == 0) {
1233 ret = -ENOENT;
1234 goto end;
1235 }
1236 vstream->index_file = lttng_index_file_create_from_trace_chunk_read_only(
1237 vstream->stream_file.trace_chunk, rstream->path_name,
1238 rstream->channel_name, rstream->tracefile_size,
1239 vstream->current_tracefile_id,
1240 lttng_to_index_major(connection_major, connection_minor),
1241 lttng_to_index_minor(connection_major, connection_minor));
1242 if (!vstream->index_file) {
1243 ret = -1;
1244 }
1245
1246 end:
1247 return ret;
1248 }
1249
1250 /*
1251 * Check the status of the index for the given stream. This function
1252 * updates the index structure if needed and can put (close) the vstream
1253 * in the HUP situation.
1254 *
1255 * Return 0 means that we can proceed with the index. A value of 1 means
1256 * that the index has been updated and is ready to be sent to the
1257 * client. A negative value indicates an error that can't be handled.
1258 *
1259 * Called with rstream lock held.
1260 */
1261 static int check_index_status(struct relay_viewer_stream *vstream,
1262 struct relay_stream *rstream, struct ctf_trace *trace,
1263 struct lttng_viewer_index *index)
1264 {
1265 int ret;
1266
1267 if ((trace->session->connection_closed || rstream->closed)
1268 && rstream->index_received_seqcount
1269 == vstream->index_sent_seqcount) {
1270 /*
1271 * Last index sent and session connection or relay
1272 * stream are closed.
1273 */
1274 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1275 goto hup;
1276 } else if (rstream->beacon_ts_end != -1ULL &&
1277 rstream->index_received_seqcount
1278 == vstream->index_sent_seqcount) {
1279 /*
1280 * We've received a synchronization beacon and the last index
1281 * available has been sent, the index for now is inactive.
1282 *
1283 * In this case, we have received a beacon which allows us to
1284 * inform the client of a time interval during which we can
1285 * guarantee that there are no events to read (and never will
1286 * be).
1287 */
1288 index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
1289 index->timestamp_end = htobe64(rstream->beacon_ts_end);
1290 index->stream_id = htobe64(rstream->ctf_stream_id);
1291 goto index_ready;
1292 } else if (rstream->index_received_seqcount
1293 == vstream->index_sent_seqcount) {
1294 /*
1295 * This checks whether received == sent seqcount. In
1296 * this case, we have not received a beacon. Therefore,
1297 * we can only ask the client to retry later.
1298 */
1299 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1300 goto index_ready;
1301 } else if (!tracefile_array_seq_in_file(rstream->tfa,
1302 vstream->current_tracefile_id,
1303 vstream->index_sent_seqcount)) {
1304 /*
1305 * The next index we want to send cannot be read either
1306 * because we need to perform a rotation, or due to
1307 * the producer having overwritten its trace file.
1308 */
1309 DBG("Viewer stream %" PRIu64 " rotation",
1310 vstream->stream->stream_handle);
1311 ret = viewer_stream_rotate(vstream);
1312 if (ret < 0) {
1313 goto end;
1314 } else if (ret == 1) {
1315 /* EOF across entire stream. */
1316 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1317 goto hup;
1318 }
1319 /*
1320 * If we have been pushed due to overwrite, it
1321 * necessarily means there is data that can be read in
1322 * the stream. If we rotated because we reached the end
1323 * of a tracefile, it means the following tracefile
1324 * needs to contain at least one index, else we would
1325 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1326 * viewer. The updated index_sent_seqcount needs to
1327 * point to a readable index entry now.
1328 *
1329 * In the case where we "rotate" on a single file, we
1330 * can end up in a case where the requested index is
1331 * still unavailable.
1332 */
1333 if (rstream->tracefile_count == 1 &&
1334 !tracefile_array_seq_in_file(
1335 rstream->tfa,
1336 vstream->current_tracefile_id,
1337 vstream->index_sent_seqcount)) {
1338 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1339 goto index_ready;
1340 }
1341 assert(tracefile_array_seq_in_file(rstream->tfa,
1342 vstream->current_tracefile_id,
1343 vstream->index_sent_seqcount));
1344 }
1345 /* ret == 0 means successful so we continue. */
1346 ret = 0;
1347 end:
1348 return ret;
1349
1350 hup:
1351 viewer_stream_put(vstream);
1352 index_ready:
1353 return 1;
1354 }
1355
1356 /*
1357 * Send the next index for a stream.
1358 *
1359 * Return 0 on success or else a negative value.
1360 */
1361 static
1362 int viewer_get_next_index(struct relay_connection *conn)
1363 {
1364 int ret;
1365 struct lttng_viewer_get_next_index request_index;
1366 struct lttng_viewer_index viewer_index;
1367 struct ctf_packet_index packet_index;
1368 struct relay_viewer_stream *vstream = NULL;
1369 struct relay_stream *rstream = NULL;
1370 struct ctf_trace *ctf_trace = NULL;
1371 struct relay_viewer_stream *metadata_viewer_stream = NULL;
1372
1373 assert(conn);
1374
1375 DBG("Viewer get next index");
1376
1377 memset(&viewer_index, 0, sizeof(viewer_index));
1378 health_code_update();
1379
1380 ret = recv_request(conn->sock, &request_index, sizeof(request_index));
1381 if (ret < 0) {
1382 goto end;
1383 }
1384 health_code_update();
1385
1386 vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id));
1387 if (!vstream) {
1388 DBG("Client requested index of unknown stream id %" PRIu64,
1389 (uint64_t) be64toh(request_index.stream_id));
1390 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1391 goto send_reply;
1392 }
1393
1394 /* Use back. ref. Protected by refcounts. */
1395 rstream = vstream->stream;
1396 ctf_trace = rstream->trace;
1397
1398 /* metadata_viewer_stream may be NULL. */
1399 metadata_viewer_stream =
1400 ctf_trace_get_viewer_metadata_stream(ctf_trace);
1401
1402 pthread_mutex_lock(&rstream->lock);
1403
1404 /*
1405 * The viewer should not ask for index on metadata stream.
1406 */
1407 if (rstream->is_metadata) {
1408 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1409 goto send_reply;
1410 }
1411
1412 /* Try to open an index if one is needed for that stream. */
1413 ret = try_open_index(vstream, rstream);
1414 if (ret < 0) {
1415 if (ret == -ENOENT) {
1416 /*
1417 * The index is created only when the first data
1418 * packet arrives, it might not be ready at the
1419 * beginning of the session
1420 */
1421 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1422 } else {
1423 /* Unhandled error. */
1424 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1425 }
1426 goto send_reply;
1427 }
1428
1429 ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
1430 if (ret < 0) {
1431 goto error_put;
1432 } else if (ret == 1) {
1433 /*
1434 * We have no index to send and check_index_status has populated
1435 * viewer_index's status.
1436 */
1437 goto send_reply;
1438 }
1439 /* At this point, ret is 0 thus we will be able to read the index. */
1440 assert(!ret);
1441
1442 /*
1443 * vstream->stream_fd may be NULL if it has been closed by
1444 * tracefile rotation, or if we are at the beginning of the
1445 * stream. We open the data stream file here to protect against
1446 * overwrite caused by tracefile rotation (in association with
1447 * unlink performed before overwrite).
1448 */
1449 if (!vstream->stream_file.fd) {
1450 int fd;
1451 char file_path[LTTNG_PATH_MAX];
1452 enum lttng_trace_chunk_status status;
1453
1454 ret = utils_stream_file_path(rstream->path_name,
1455 rstream->channel_name, rstream->tracefile_size,
1456 vstream->current_tracefile_id, NULL, file_path,
1457 sizeof(file_path));
1458 if (ret < 0) {
1459 goto error_put;
1460 }
1461
1462 status = lttng_trace_chunk_open_file(
1463 vstream->stream_file.trace_chunk,
1464 file_path, O_RDONLY, 0, &fd);
1465 if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1466 PERROR("Failed to open trace file for viewer stream");
1467 goto error_put;
1468 }
1469 vstream->stream_file.fd = stream_fd_create(fd);
1470 if (!vstream->stream_file.fd) {
1471 if (close(fd)) {
1472 PERROR("Failed to close viewer stream file");
1473 }
1474 goto error_put;
1475 }
1476 }
1477
1478 ret = check_new_streams(conn);
1479 if (ret < 0) {
1480 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1481 goto send_reply;
1482 } else if (ret == 1) {
1483 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
1484 }
1485
1486 ret = lttng_index_file_read(vstream->index_file, &packet_index);
1487 if (ret) {
1488 ERR("Relay error reading index file %d",
1489 vstream->index_file->fd);
1490 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1491 goto send_reply;
1492 } else {
1493 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
1494 vstream->index_sent_seqcount++;
1495 }
1496
1497 /*
1498 * Indexes are stored in big endian, no need to switch before sending.
1499 */
1500 DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64,
1501 rstream->stream_handle,
1502 (uint64_t) be64toh(packet_index.offset));
1503 viewer_index.offset = packet_index.offset;
1504 viewer_index.packet_size = packet_index.packet_size;
1505 viewer_index.content_size = packet_index.content_size;
1506 viewer_index.timestamp_begin = packet_index.timestamp_begin;
1507 viewer_index.timestamp_end = packet_index.timestamp_end;
1508 viewer_index.events_discarded = packet_index.events_discarded;
1509 viewer_index.stream_id = packet_index.stream_id;
1510
1511 send_reply:
1512 if (rstream) {
1513 pthread_mutex_unlock(&rstream->lock);
1514 }
1515
1516 if (metadata_viewer_stream) {
1517 pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
1518 DBG("get next index metadata check: recv %" PRIu64
1519 " sent %" PRIu64,
1520 metadata_viewer_stream->stream->metadata_received,
1521 metadata_viewer_stream->metadata_sent);
1522 if (!metadata_viewer_stream->stream->metadata_received ||
1523 metadata_viewer_stream->stream->metadata_received >
1524 metadata_viewer_stream->metadata_sent) {
1525 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
1526 }
1527 pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
1528 }
1529
1530 viewer_index.flags = htobe32(viewer_index.flags);
1531 health_code_update();
1532
1533 ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index));
1534 if (ret < 0) {
1535 goto end;
1536 }
1537 health_code_update();
1538
1539 if (vstream) {
1540 DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
1541 vstream->index_sent_seqcount,
1542 vstream->stream->stream_handle);
1543 }
1544 end:
1545 if (metadata_viewer_stream) {
1546 viewer_stream_put(metadata_viewer_stream);
1547 }
1548 if (vstream) {
1549 viewer_stream_put(vstream);
1550 }
1551 return ret;
1552
1553 error_put:
1554 pthread_mutex_unlock(&rstream->lock);
1555 if (metadata_viewer_stream) {
1556 viewer_stream_put(metadata_viewer_stream);
1557 }
1558 viewer_stream_put(vstream);
1559 return ret;
1560 }
1561
1562 /*
1563 * Send the next index for a stream
1564 *
1565 * Return 0 on success or else a negative value.
1566 */
1567 static
1568 int viewer_get_packet(struct relay_connection *conn)
1569 {
1570 int ret;
1571 off_t lseek_ret;
1572 char *reply = NULL;
1573 struct lttng_viewer_get_packet get_packet_info;
1574 struct lttng_viewer_trace_packet reply_header;
1575 struct relay_viewer_stream *vstream = NULL;
1576 uint32_t reply_size = sizeof(reply_header);
1577 uint32_t packet_data_len = 0;
1578 ssize_t read_len;
1579
1580 DBG2("Relay get data packet");
1581
1582 health_code_update();
1583
1584 ret = recv_request(conn->sock, &get_packet_info,
1585 sizeof(get_packet_info));
1586 if (ret < 0) {
1587 goto end;
1588 }
1589 health_code_update();
1590
1591 /* From this point on, the error label can be reached. */
1592 memset(&reply_header, 0, sizeof(reply_header));
1593
1594 vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id));
1595 if (!vstream) {
1596 DBG("Client requested packet of unknown stream id %" PRIu64,
1597 (uint64_t) be64toh(get_packet_info.stream_id));
1598 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1599 goto send_reply_nolock;
1600 } else {
1601 packet_data_len = be32toh(get_packet_info.len);
1602 reply_size += packet_data_len;
1603 }
1604
1605 reply = zmalloc(reply_size);
1606 if (!reply) {
1607 PERROR("packet reply zmalloc");
1608 reply_size = sizeof(reply_header);
1609 goto error;
1610 }
1611
1612 pthread_mutex_lock(&vstream->stream->lock);
1613 lseek_ret = lseek(vstream->stream_file.fd->fd,
1614 be64toh(get_packet_info.offset), SEEK_SET);
1615 if (lseek_ret < 0) {
1616 PERROR("lseek fd %d to offset %" PRIu64,
1617 vstream->stream_file.fd->fd,
1618 (uint64_t) be64toh(get_packet_info.offset));
1619 goto error;
1620 }
1621 read_len = lttng_read(vstream->stream_file.fd->fd,
1622 reply + sizeof(reply_header), packet_data_len);
1623 if (read_len < packet_data_len) {
1624 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
1625 vstream->stream_file.fd->fd,
1626 (uint64_t) be64toh(get_packet_info.offset));
1627 goto error;
1628 }
1629 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK);
1630 reply_header.len = htobe32(packet_data_len);
1631 goto send_reply;
1632
1633 error:
1634 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1635
1636 send_reply:
1637 if (vstream) {
1638 pthread_mutex_unlock(&vstream->stream->lock);
1639 }
1640 send_reply_nolock:
1641
1642 health_code_update();
1643
1644 if (reply) {
1645 memcpy(reply, &reply_header, sizeof(reply_header));
1646 ret = send_response(conn->sock, reply, reply_size);
1647 } else {
1648 /* No reply to send. */
1649 ret = send_response(conn->sock, &reply_header,
1650 reply_size);
1651 }
1652
1653 health_code_update();
1654 if (ret < 0) {
1655 PERROR("sendmsg of packet data failed");
1656 goto end_free;
1657 }
1658
1659 DBG("Sent %u bytes for stream %" PRIu64, reply_size,
1660 (uint64_t) be64toh(get_packet_info.stream_id));
1661
1662 end_free:
1663 free(reply);
1664 end:
1665 if (vstream) {
1666 viewer_stream_put(vstream);
1667 }
1668 return ret;
1669 }
1670
1671 /*
1672 * Send the session's metadata
1673 *
1674 * Return 0 on success else a negative value.
1675 */
1676 static
1677 int viewer_get_metadata(struct relay_connection *conn)
1678 {
1679 int ret = 0;
1680 ssize_t read_len;
1681 uint64_t len = 0;
1682 char *data = NULL;
1683 struct lttng_viewer_get_metadata request;
1684 struct lttng_viewer_metadata_packet reply;
1685 struct relay_viewer_stream *vstream = NULL;
1686
1687 assert(conn);
1688
1689 DBG("Relay get metadata");
1690
1691 health_code_update();
1692
1693 ret = recv_request(conn->sock, &request, sizeof(request));
1694 if (ret < 0) {
1695 goto end;
1696 }
1697 health_code_update();
1698
1699 memset(&reply, 0, sizeof(reply));
1700
1701 vstream = viewer_stream_get_by_id(be64toh(request.stream_id));
1702 if (!vstream) {
1703 /*
1704 * The metadata stream can be closed by a CLOSE command
1705 * just before we attach. It can also be closed by
1706 * per-pid tracing during tracing. Therefore, it is
1707 * possible that we cannot find this viewer stream.
1708 * Reply back to the client with an error if we cannot
1709 * find it.
1710 */
1711 DBG("Client requested metadata of unknown stream id %" PRIu64,
1712 (uint64_t) be64toh(request.stream_id));
1713 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
1714 goto send_reply;
1715 }
1716 pthread_mutex_lock(&vstream->stream->lock);
1717 if (!vstream->stream->is_metadata) {
1718 ERR("Invalid metadata stream");
1719 goto error;
1720 }
1721
1722 assert(vstream->metadata_sent <= vstream->stream->metadata_received);
1723
1724 len = vstream->stream->metadata_received - vstream->metadata_sent;
1725 if (len == 0) {
1726 reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
1727 goto send_reply;
1728 }
1729
1730 /* first time, we open the metadata file */
1731 if (!vstream->stream_file.fd) {
1732 int fd;
1733 char file_path[LTTNG_PATH_MAX];
1734 enum lttng_trace_chunk_status status;
1735 struct relay_stream *rstream = vstream->stream;
1736
1737 ret = utils_stream_file_path(rstream->path_name,
1738 rstream->channel_name, rstream->tracefile_size,
1739 vstream->current_tracefile_id, NULL, file_path,
1740 sizeof(file_path));
1741 if (ret < 0) {
1742 goto error;
1743 }
1744
1745 status = lttng_trace_chunk_open_file(
1746 vstream->stream_file.trace_chunk,
1747 file_path, O_RDONLY, 0, &fd);
1748 if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1749 PERROR("Failed to open metadata file for viewer stream");
1750 goto error;
1751 }
1752 vstream->stream_file.fd = stream_fd_create(fd);
1753 if (!vstream->stream_file.fd) {
1754 if (close(fd)) {
1755 PERROR("Failed to close viewer metadata file");
1756 }
1757 goto error;
1758 }
1759 }
1760
1761 reply.len = htobe64(len);
1762 data = zmalloc(len);
1763 if (!data) {
1764 PERROR("viewer metadata zmalloc");
1765 goto error;
1766 }
1767
1768 read_len = lttng_read(vstream->stream_file.fd->fd, data, len);
1769 if (read_len < len) {
1770 PERROR("Relay reading metadata file");
1771 goto error;
1772 }
1773 vstream->metadata_sent += read_len;
1774 if (vstream->metadata_sent == vstream->stream->metadata_received
1775 && vstream->stream->closed) {
1776 /* Release ownership for the viewer metadata stream. */
1777 viewer_stream_put(vstream);
1778 }
1779
1780 reply.status = htobe32(LTTNG_VIEWER_METADATA_OK);
1781
1782 goto send_reply;
1783
1784 error:
1785 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
1786
1787 send_reply:
1788 health_code_update();
1789 if (vstream) {
1790 pthread_mutex_unlock(&vstream->stream->lock);
1791 }
1792 ret = send_response(conn->sock, &reply, sizeof(reply));
1793 if (ret < 0) {
1794 goto end_free;
1795 }
1796 health_code_update();
1797
1798 if (len > 0) {
1799 ret = send_response(conn->sock, data, len);
1800 if (ret < 0) {
1801 goto end_free;
1802 }
1803 }
1804
1805 DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
1806 (uint64_t) be64toh(request.stream_id));
1807
1808 DBG("Metadata sent");
1809
1810 end_free:
1811 free(data);
1812 end:
1813 if (vstream) {
1814 viewer_stream_put(vstream);
1815 }
1816 return ret;
1817 }
1818
1819 /*
1820 * Create a viewer session.
1821 *
1822 * Return 0 on success or else a negative value.
1823 */
1824 static
1825 int viewer_create_session(struct relay_connection *conn)
1826 {
1827 int ret;
1828 struct lttng_viewer_create_session_response resp;
1829
1830 DBG("Viewer create session received");
1831
1832 memset(&resp, 0, sizeof(resp));
1833 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK);
1834 conn->viewer_session = viewer_session_create();
1835 if (!conn->viewer_session) {
1836 ERR("Allocation viewer session");
1837 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR);
1838 goto send_reply;
1839 }
1840
1841 send_reply:
1842 health_code_update();
1843 ret = send_response(conn->sock, &resp, sizeof(resp));
1844 if (ret < 0) {
1845 goto end;
1846 }
1847 health_code_update();
1848 ret = 0;
1849
1850 end:
1851 return ret;
1852 }
1853
1854 /*
1855 * Detach a viewer session.
1856 *
1857 * Return 0 on success or else a negative value.
1858 */
1859 static
1860 int viewer_detach_session(struct relay_connection *conn)
1861 {
1862 int ret;
1863 struct lttng_viewer_detach_session_response response;
1864 struct lttng_viewer_detach_session_request request;
1865 struct relay_session *session = NULL;
1866 uint64_t viewer_session_to_close;
1867
1868 DBG("Viewer detach session received");
1869
1870 assert(conn);
1871
1872 health_code_update();
1873
1874 /* Receive the request from the connected client. */
1875 ret = recv_request(conn->sock, &request, sizeof(request));
1876 if (ret < 0) {
1877 goto end;
1878 }
1879 viewer_session_to_close = be64toh(request.session_id);
1880
1881 if (!conn->viewer_session) {
1882 DBG("Client trying to detach before creating a live viewer session");
1883 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
1884 goto send_reply;
1885 }
1886
1887 health_code_update();
1888
1889 memset(&response, 0, sizeof(response));
1890 DBG("Detaching from session ID %" PRIu64, viewer_session_to_close);
1891
1892 session = session_get_by_id(be64toh(request.session_id));
1893 if (!session) {
1894 DBG("Relay session %" PRIu64 " not found",
1895 (uint64_t) be64toh(request.session_id));
1896 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK);
1897 goto send_reply;
1898 }
1899
1900 ret = viewer_session_is_attached(conn->viewer_session, session);
1901 if (ret != 1) {
1902 DBG("Not attached to this session");
1903 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
1904 goto send_reply_put;
1905 }
1906
1907 viewer_session_close_one_session(conn->viewer_session, session);
1908 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK);
1909 DBG("Session %" PRIu64 " detached.", viewer_session_to_close);
1910
1911 send_reply_put:
1912 session_put(session);
1913
1914 send_reply:
1915 health_code_update();
1916 ret = send_response(conn->sock, &response, sizeof(response));
1917 if (ret < 0) {
1918 goto end;
1919 }
1920 health_code_update();
1921 ret = 0;
1922
1923 end:
1924 return ret;
1925 }
1926
1927 /*
1928 * live_relay_unknown_command: send -1 if received unknown command
1929 */
1930 static
1931 void live_relay_unknown_command(struct relay_connection *conn)
1932 {
1933 struct lttcomm_relayd_generic_reply reply;
1934
1935 memset(&reply, 0, sizeof(reply));
1936 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1937 (void) send_response(conn->sock, &reply, sizeof(reply));
1938 }
1939
1940 /*
1941 * Process the commands received on the control socket
1942 */
1943 static
1944 int process_control(struct lttng_viewer_cmd *recv_hdr,
1945 struct relay_connection *conn)
1946 {
1947 int ret = 0;
1948 uint32_t msg_value;
1949
1950 msg_value = be32toh(recv_hdr->cmd);
1951
1952 /*
1953 * Make sure we've done the version check before any command other then a
1954 * new client connection.
1955 */
1956 if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) {
1957 ERR("Viewer conn value %" PRIu32 " before version check", msg_value);
1958 ret = -1;
1959 goto end;
1960 }
1961
1962 switch (msg_value) {
1963 case LTTNG_VIEWER_CONNECT:
1964 ret = viewer_connect(conn);
1965 break;
1966 case LTTNG_VIEWER_LIST_SESSIONS:
1967 ret = viewer_list_sessions(conn);
1968 break;
1969 case LTTNG_VIEWER_ATTACH_SESSION:
1970 ret = viewer_attach_session(conn);
1971 break;
1972 case LTTNG_VIEWER_GET_NEXT_INDEX:
1973 ret = viewer_get_next_index(conn);
1974 break;
1975 case LTTNG_VIEWER_GET_PACKET:
1976 ret = viewer_get_packet(conn);
1977 break;
1978 case LTTNG_VIEWER_GET_METADATA:
1979 ret = viewer_get_metadata(conn);
1980 break;
1981 case LTTNG_VIEWER_GET_NEW_STREAMS:
1982 ret = viewer_get_new_streams(conn);
1983 break;
1984 case LTTNG_VIEWER_CREATE_SESSION:
1985 ret = viewer_create_session(conn);
1986 break;
1987 case LTTNG_VIEWER_DETACH_SESSION:
1988 ret = viewer_detach_session(conn);
1989 break;
1990 default:
1991 ERR("Received unknown viewer command (%u)",
1992 be32toh(recv_hdr->cmd));
1993 live_relay_unknown_command(conn);
1994 ret = -1;
1995 goto end;
1996 }
1997
1998 end:
1999 return ret;
2000 }
2001
2002 static
2003 void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
2004 {
2005 int ret;
2006
2007 (void) lttng_poll_del(events, pollfd);
2008
2009 ret = close(pollfd);
2010 if (ret < 0) {
2011 ERR("Closing pollfd %d", pollfd);
2012 }
2013 }
2014
2015 /*
2016 * This thread does the actual work
2017 */
2018 static
2019 void *thread_worker(void *data)
2020 {
2021 int ret, err = -1;
2022 uint32_t nb_fd;
2023 struct lttng_poll_event events;
2024 struct lttng_ht *viewer_connections_ht;
2025 struct lttng_ht_iter iter;
2026 struct lttng_viewer_cmd recv_hdr;
2027 struct relay_connection *destroy_conn;
2028
2029 DBG("[thread] Live viewer relay worker started");
2030
2031 rcu_register_thread();
2032
2033 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
2034
2035 if (testpoint(relayd_thread_live_worker)) {
2036 goto error_testpoint;
2037 }
2038
2039 /* table of connections indexed on socket */
2040 viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2041 if (!viewer_connections_ht) {
2042 goto viewer_connections_ht_error;
2043 }
2044
2045 ret = create_thread_poll_set(&events, 2);
2046 if (ret < 0) {
2047 goto error_poll_create;
2048 }
2049
2050 ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
2051 if (ret < 0) {
2052 goto error;
2053 }
2054
2055 restart:
2056 while (1) {
2057 int i;
2058
2059 health_code_update();
2060
2061 /* Infinite blocking call, waiting for transmission */
2062 DBG3("Relayd live viewer worker thread polling...");
2063 health_poll_entry();
2064 ret = lttng_poll_wait(&events, -1);
2065 health_poll_exit();
2066 if (ret < 0) {
2067 /*
2068 * Restart interrupted system call.
2069 */
2070 if (errno == EINTR) {
2071 goto restart;
2072 }
2073 goto error;
2074 }
2075
2076 nb_fd = ret;
2077
2078 /*
2079 * Process control. The control connection is prioritised so we don't
2080 * starve it with high throughput tracing data on the data
2081 * connection.
2082 */
2083 for (i = 0; i < nb_fd; i++) {
2084 /* Fetch once the poll data */
2085 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
2086 int pollfd = LTTNG_POLL_GETFD(&events, i);
2087
2088 health_code_update();
2089
2090 /* Thread quit pipe has been closed. Killing thread. */
2091 ret = check_thread_quit_pipe(pollfd, revents);
2092 if (ret) {
2093 err = 0;
2094 goto exit;
2095 }
2096
2097 /* Inspect the relay conn pipe for new connection. */
2098 if (pollfd == live_conn_pipe[0]) {
2099 if (revents & LPOLLIN) {
2100 struct relay_connection *conn;
2101
2102 ret = lttng_read(live_conn_pipe[0],
2103 &conn, sizeof(conn));
2104 if (ret < 0) {
2105 goto error;
2106 }
2107 ret = lttng_poll_add(&events,
2108 conn->sock->fd,
2109 LPOLLIN | LPOLLRDHUP);
2110 if (ret) {
2111 ERR("Failed to add new live connection file descriptor to poll set");
2112 goto error;
2113 }
2114 connection_ht_add(viewer_connections_ht, conn);
2115 DBG("Connection socket %d added to poll", conn->sock->fd);
2116 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2117 ERR("Relay live pipe error");
2118 goto error;
2119 } else {
2120 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2121 goto error;
2122 }
2123 } else {
2124 /* Connection activity. */
2125 struct relay_connection *conn;
2126
2127 conn = connection_get_by_sock(viewer_connections_ht, pollfd);
2128 if (!conn) {
2129 continue;
2130 }
2131
2132 if (revents & LPOLLIN) {
2133 ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
2134 sizeof(recv_hdr), 0);
2135 if (ret <= 0) {
2136 /* Connection closed. */
2137 cleanup_connection_pollfd(&events, pollfd);
2138 /* Put "create" ownership reference. */
2139 connection_put(conn);
2140 DBG("Viewer control conn closed with %d", pollfd);
2141 } else {
2142 ret = process_control(&recv_hdr, conn);
2143 if (ret < 0) {
2144 /* Clear the session on error. */
2145 cleanup_connection_pollfd(&events, pollfd);
2146 /* Put "create" ownership reference. */
2147 connection_put(conn);
2148 DBG("Viewer connection closed with %d", pollfd);
2149 }
2150 }
2151 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2152 cleanup_connection_pollfd(&events, pollfd);
2153 /* Put "create" ownership reference. */
2154 connection_put(conn);
2155 } else {
2156 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2157 connection_put(conn);
2158 goto error;
2159 }
2160 /* Put local "get_by_sock" reference. */
2161 connection_put(conn);
2162 }
2163 }
2164 }
2165
2166 exit:
2167 error:
2168 lttng_poll_clean(&events);
2169
2170 /* Cleanup remaining connection object. */
2171 rcu_read_lock();
2172 cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter,
2173 destroy_conn,
2174 sock_n.node) {
2175 health_code_update();
2176 connection_put(destroy_conn);
2177 }
2178 rcu_read_unlock();
2179 error_poll_create:
2180 lttng_ht_destroy(viewer_connections_ht);
2181 viewer_connections_ht_error:
2182 /* Close relay conn pipes */
2183 utils_close_pipe(live_conn_pipe);
2184 if (err) {
2185 DBG("Viewer worker thread exited with error");
2186 }
2187 DBG("Viewer worker thread cleanup complete");
2188 error_testpoint:
2189 if (err) {
2190 health_error();
2191 ERR("Health error occurred in %s", __func__);
2192 }
2193 health_unregister(health_relayd);
2194 if (lttng_relay_stop_threads()) {
2195 ERR("Error stopping threads");
2196 }
2197 rcu_unregister_thread();
2198 return NULL;
2199 }
2200
2201 /*
2202 * Create the relay command pipe to wake thread_manage_apps.
2203 * Closed in cleanup().
2204 */
2205 static int create_conn_pipe(void)
2206 {
2207 return utils_create_pipe_cloexec(live_conn_pipe);
2208 }
2209
2210 int relayd_live_join(void)
2211 {
2212 int ret, retval = 0;
2213 void *status;
2214
2215 ret = pthread_join(live_listener_thread, &status);
2216 if (ret) {
2217 errno = ret;
2218 PERROR("pthread_join live listener");
2219 retval = -1;
2220 }
2221
2222 ret = pthread_join(live_worker_thread, &status);
2223 if (ret) {
2224 errno = ret;
2225 PERROR("pthread_join live worker");
2226 retval = -1;
2227 }
2228
2229 ret = pthread_join(live_dispatcher_thread, &status);
2230 if (ret) {
2231 errno = ret;
2232 PERROR("pthread_join live dispatcher");
2233 retval = -1;
2234 }
2235
2236 cleanup_relayd_live();
2237
2238 return retval;
2239 }
2240
2241 /*
2242 * main
2243 */
2244 int relayd_live_create(struct lttng_uri *uri)
2245 {
2246 int ret = 0, retval = 0;
2247 void *status;
2248 int is_root;
2249
2250 if (!uri) {
2251 retval = -1;
2252 goto exit_init_data;
2253 }
2254 live_uri = uri;
2255
2256 /* Check if daemon is UID = 0 */
2257 is_root = !getuid();
2258
2259 if (!is_root) {
2260 if (live_uri->port < 1024) {
2261 ERR("Need to be root to use ports < 1024");
2262 retval = -1;
2263 goto exit_init_data;
2264 }
2265 }
2266
2267 /* Setup the thread apps communication pipe. */
2268 if (create_conn_pipe()) {
2269 retval = -1;
2270 goto exit_init_data;
2271 }
2272
2273 /* Init relay command queue. */
2274 cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail);
2275
2276 /* Set up max poll set size */
2277 if (lttng_poll_set_max_size()) {
2278 retval = -1;
2279 goto exit_init_data;
2280 }
2281
2282 /* Setup the dispatcher thread */
2283 ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(),
2284 thread_dispatcher, (void *) NULL);
2285 if (ret) {
2286 errno = ret;
2287 PERROR("pthread_create viewer dispatcher");
2288 retval = -1;
2289 goto exit_dispatcher_thread;
2290 }
2291
2292 /* Setup the worker thread */
2293 ret = pthread_create(&live_worker_thread, default_pthread_attr(),
2294 thread_worker, NULL);
2295 if (ret) {
2296 errno = ret;
2297 PERROR("pthread_create viewer worker");
2298 retval = -1;
2299 goto exit_worker_thread;
2300 }
2301
2302 /* Setup the listener thread */
2303 ret = pthread_create(&live_listener_thread, default_pthread_attr(),
2304 thread_listener, (void *) NULL);
2305 if (ret) {
2306 errno = ret;
2307 PERROR("pthread_create viewer listener");
2308 retval = -1;
2309 goto exit_listener_thread;
2310 }
2311
2312 /*
2313 * All OK, started all threads.
2314 */
2315 return retval;
2316
2317 /*
2318 * Join on the live_listener_thread should anything be added after
2319 * the live_listener thread's creation.
2320 */
2321
2322 exit_listener_thread:
2323
2324 ret = pthread_join(live_worker_thread, &status);
2325 if (ret) {
2326 errno = ret;
2327 PERROR("pthread_join live worker");
2328 retval = -1;
2329 }
2330 exit_worker_thread:
2331
2332 ret = pthread_join(live_dispatcher_thread, &status);
2333 if (ret) {
2334 errno = ret;
2335 PERROR("pthread_join live dispatcher");
2336 retval = -1;
2337 }
2338 exit_dispatcher_thread:
2339
2340 exit_init_data:
2341 cleanup_relayd_live();
2342
2343 return retval;
2344 }
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