250d85c6fb39fde7558004f95c198b216b009a6d
[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 ctf_trace_put(ctf_trace);
342 continue;
343 }
344
345 cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) {
346 struct relay_viewer_stream *vstream;
347
348 if (!stream_get(stream)) {
349 continue;
350 }
351 /*
352 * stream published is protected by the session lock.
353 */
354 if (!stream->published) {
355 goto next;
356 }
357 vstream = viewer_stream_get_by_id(stream->stream_handle);
358 if (!vstream) {
359 /*
360 * Save that we sent the metadata stream to the
361 * viewer. So that we know what trace the viewer
362 * is aware of.
363 */
364 if (stream->is_metadata) {
365 ctf_trace->metadata_stream_sent_to_viewer =
366 true;
367 }
368 vstream = viewer_stream_create(stream,
369 viewer_trace_chunk, seek_t);
370 if (!vstream) {
371 ret = -1;
372 ctf_trace_put(ctf_trace);
373 stream_put(stream);
374 goto error_unlock;
375 }
376
377 if (nb_created) {
378 /* Update number of created stream counter. */
379 (*nb_created)++;
380 }
381 /*
382 * Ensure a self-reference is preserved even
383 * after we have put our local reference.
384 */
385 if (!viewer_stream_get(vstream)) {
386 ERR("Unable to get self-reference on viewer stream, logic error.");
387 abort();
388 }
389 } else {
390 if (!vstream->sent_flag && nb_unsent) {
391 /* Update number of unsent stream counter. */
392 (*nb_unsent)++;
393 }
394 }
395 /* Update number of total stream counter. */
396 if (nb_total) {
397 if (stream->is_metadata) {
398 if (!stream->closed ||
399 stream->metadata_received > vstream->metadata_sent) {
400 (*nb_total)++;
401 }
402 } else {
403 if (!stream->closed ||
404 !(((int64_t) (stream->prev_data_seq - stream->last_net_seq_num)) >= 0)) {
405
406 (*nb_total)++;
407 }
408 }
409 }
410 /* Put local reference. */
411 viewer_stream_put(vstream);
412 next:
413 stream_put(stream);
414 }
415 ctf_trace_put(ctf_trace);
416 }
417
418 ret = 0;
419
420 error_unlock:
421 rcu_read_unlock();
422 error:
423 return ret;
424 }
425
426 int relayd_live_stop(void)
427 {
428 /* Stop dispatch thread */
429 CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
430 futex_nto1_wake(&viewer_conn_queue.futex);
431 return 0;
432 }
433
434 /*
435 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
436 */
437 static
438 int create_thread_poll_set(struct lttng_poll_event *events, int size)
439 {
440 int ret;
441
442 if (events == NULL || size == 0) {
443 ret = -1;
444 goto error;
445 }
446
447 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
448 if (ret < 0) {
449 goto error;
450 }
451
452 /* Add quit pipe */
453 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
454 if (ret < 0) {
455 goto error;
456 }
457
458 return 0;
459
460 error:
461 return ret;
462 }
463
464 /*
465 * Check if the thread quit pipe was triggered.
466 *
467 * Return 1 if it was triggered else 0;
468 */
469 static
470 int check_thread_quit_pipe(int fd, uint32_t events)
471 {
472 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
473 return 1;
474 }
475
476 return 0;
477 }
478
479 /*
480 * Create and init socket from uri.
481 */
482 static
483 struct lttcomm_sock *init_socket(struct lttng_uri *uri)
484 {
485 int ret;
486 struct lttcomm_sock *sock = NULL;
487
488 sock = lttcomm_alloc_sock_from_uri(uri);
489 if (sock == NULL) {
490 ERR("Allocating socket");
491 goto error;
492 }
493
494 ret = lttcomm_create_sock(sock);
495 if (ret < 0) {
496 goto error;
497 }
498 DBG("Listening on sock %d for lttng-live", sock->fd);
499
500 ret = sock->ops->bind(sock);
501 if (ret < 0) {
502 PERROR("Failed to bind lttng-live socket");
503 goto error;
504 }
505
506 ret = sock->ops->listen(sock, -1);
507 if (ret < 0) {
508 goto error;
509
510 }
511
512 return sock;
513
514 error:
515 if (sock) {
516 lttcomm_destroy_sock(sock);
517 }
518 return NULL;
519 }
520
521 /*
522 * This thread manages the listening for new connections on the network
523 */
524 static
525 void *thread_listener(void *data)
526 {
527 int i, ret, pollfd, err = -1;
528 uint32_t revents, nb_fd;
529 struct lttng_poll_event events;
530 struct lttcomm_sock *live_control_sock;
531
532 DBG("[thread] Relay live listener started");
533
534 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER);
535
536 health_code_update();
537
538 live_control_sock = init_socket(live_uri);
539 if (!live_control_sock) {
540 goto error_sock_control;
541 }
542
543 /* Pass 2 as size here for the thread quit pipe and control sockets. */
544 ret = create_thread_poll_set(&events, 2);
545 if (ret < 0) {
546 goto error_create_poll;
547 }
548
549 /* Add the control socket */
550 ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP);
551 if (ret < 0) {
552 goto error_poll_add;
553 }
554
555 lttng_relay_notify_ready();
556
557 if (testpoint(relayd_thread_live_listener)) {
558 goto error_testpoint;
559 }
560
561 while (1) {
562 health_code_update();
563
564 DBG("Listener accepting live viewers connections");
565
566 restart:
567 health_poll_entry();
568 ret = lttng_poll_wait(&events, -1);
569 health_poll_exit();
570 if (ret < 0) {
571 /*
572 * Restart interrupted system call.
573 */
574 if (errno == EINTR) {
575 goto restart;
576 }
577 goto error;
578 }
579 nb_fd = ret;
580
581 DBG("Relay new viewer connection received");
582 for (i = 0; i < nb_fd; i++) {
583 health_code_update();
584
585 /* Fetch once the poll data */
586 revents = LTTNG_POLL_GETEV(&events, i);
587 pollfd = LTTNG_POLL_GETFD(&events, i);
588
589 /* Thread quit pipe has been closed. Killing thread. */
590 ret = check_thread_quit_pipe(pollfd, revents);
591 if (ret) {
592 err = 0;
593 goto exit;
594 }
595
596 if (revents & LPOLLIN) {
597 /*
598 * A new connection is requested, therefore a
599 * viewer connection is allocated in this
600 * thread, enqueued to a global queue and
601 * dequeued (and freed) in the worker thread.
602 */
603 int val = 1;
604 struct relay_connection *new_conn;
605 struct lttcomm_sock *newsock;
606
607 newsock = live_control_sock->ops->accept(live_control_sock);
608 if (!newsock) {
609 PERROR("accepting control sock");
610 goto error;
611 }
612 DBG("Relay viewer connection accepted socket %d", newsock->fd);
613
614 ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
615 sizeof(val));
616 if (ret < 0) {
617 PERROR("setsockopt inet");
618 lttcomm_destroy_sock(newsock);
619 goto error;
620 }
621 new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN);
622 if (!new_conn) {
623 lttcomm_destroy_sock(newsock);
624 goto error;
625 }
626 /* Ownership assumed by the connection. */
627 newsock = NULL;
628
629 /* Enqueue request for the dispatcher thread. */
630 cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail,
631 &new_conn->qnode);
632
633 /*
634 * Wake the dispatch queue futex.
635 * Implicit memory barrier with the
636 * exchange in cds_wfcq_enqueue.
637 */
638 futex_nto1_wake(&viewer_conn_queue.futex);
639 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
640 ERR("socket poll error");
641 goto error;
642 } else {
643 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
644 goto error;
645 }
646 }
647 }
648
649 exit:
650 error:
651 error_poll_add:
652 error_testpoint:
653 lttng_poll_clean(&events);
654 error_create_poll:
655 if (live_control_sock->fd >= 0) {
656 ret = live_control_sock->ops->close(live_control_sock);
657 if (ret) {
658 PERROR("close");
659 }
660 }
661 lttcomm_destroy_sock(live_control_sock);
662 error_sock_control:
663 if (err) {
664 health_error();
665 DBG("Live viewer listener thread exited with error");
666 }
667 health_unregister(health_relayd);
668 DBG("Live viewer listener thread cleanup complete");
669 if (lttng_relay_stop_threads()) {
670 ERR("Error stopping threads");
671 }
672 return NULL;
673 }
674
675 /*
676 * This thread manages the dispatching of the requests to worker threads
677 */
678 static
679 void *thread_dispatcher(void *data)
680 {
681 int err = -1;
682 ssize_t ret;
683 struct cds_wfcq_node *node;
684 struct relay_connection *conn = NULL;
685
686 DBG("[thread] Live viewer relay dispatcher started");
687
688 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER);
689
690 if (testpoint(relayd_thread_live_dispatcher)) {
691 goto error_testpoint;
692 }
693
694 health_code_update();
695
696 for (;;) {
697 health_code_update();
698
699 /* Atomically prepare the queue futex */
700 futex_nto1_prepare(&viewer_conn_queue.futex);
701
702 if (CMM_LOAD_SHARED(live_dispatch_thread_exit)) {
703 break;
704 }
705
706 do {
707 health_code_update();
708
709 /* Dequeue commands */
710 node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head,
711 &viewer_conn_queue.tail);
712 if (node == NULL) {
713 DBG("Woken up but nothing in the live-viewer "
714 "relay command queue");
715 /* Continue thread execution */
716 break;
717 }
718 conn = caa_container_of(node, struct relay_connection, qnode);
719 DBG("Dispatching viewer request waiting on sock %d",
720 conn->sock->fd);
721
722 /*
723 * Inform worker thread of the new request. This
724 * call is blocking so we can be assured that
725 * the data will be read at some point in time
726 * or wait to the end of the world :)
727 */
728 ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn));
729 if (ret < 0) {
730 PERROR("write conn pipe");
731 connection_put(conn);
732 goto error;
733 }
734 } while (node != NULL);
735
736 /* Futex wait on queue. Blocking call on futex() */
737 health_poll_entry();
738 futex_nto1_wait(&viewer_conn_queue.futex);
739 health_poll_exit();
740 }
741
742 /* Normal exit, no error */
743 err = 0;
744
745 error:
746 error_testpoint:
747 if (err) {
748 health_error();
749 ERR("Health error occurred in %s", __func__);
750 }
751 health_unregister(health_relayd);
752 DBG("Live viewer dispatch thread dying");
753 if (lttng_relay_stop_threads()) {
754 ERR("Error stopping threads");
755 }
756 return NULL;
757 }
758
759 /*
760 * Establish connection with the viewer and check the versions.
761 *
762 * Return 0 on success or else negative value.
763 */
764 static
765 int viewer_connect(struct relay_connection *conn)
766 {
767 int ret;
768 struct lttng_viewer_connect reply, msg;
769
770 conn->version_check_done = 1;
771
772 health_code_update();
773
774 DBG("Viewer is establishing a connection to the relayd.");
775
776 ret = recv_request(conn->sock, &msg, sizeof(msg));
777 if (ret < 0) {
778 goto end;
779 }
780
781 health_code_update();
782
783 memset(&reply, 0, sizeof(reply));
784 reply.major = RELAYD_VERSION_COMM_MAJOR;
785 reply.minor = RELAYD_VERSION_COMM_MINOR;
786
787 /* Major versions must be the same */
788 if (reply.major != be32toh(msg.major)) {
789 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
790 reply.major, be32toh(msg.major));
791 ret = -1;
792 goto end;
793 }
794
795 conn->major = reply.major;
796 /* We adapt to the lowest compatible version */
797 if (reply.minor <= be32toh(msg.minor)) {
798 conn->minor = reply.minor;
799 } else {
800 conn->minor = be32toh(msg.minor);
801 }
802
803 if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) {
804 conn->type = RELAY_VIEWER_COMMAND;
805 } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) {
806 conn->type = RELAY_VIEWER_NOTIFICATION;
807 } else {
808 ERR("Unknown connection type : %u", be32toh(msg.type));
809 ret = -1;
810 goto end;
811 }
812
813 reply.major = htobe32(reply.major);
814 reply.minor = htobe32(reply.minor);
815 if (conn->type == RELAY_VIEWER_COMMAND) {
816 /*
817 * Increment outside of htobe64 macro, because the argument can
818 * be used more than once within the macro, and thus the
819 * operation may be undefined.
820 */
821 pthread_mutex_lock(&last_relay_viewer_session_id_lock);
822 last_relay_viewer_session_id++;
823 pthread_mutex_unlock(&last_relay_viewer_session_id_lock);
824 reply.viewer_session_id = htobe64(last_relay_viewer_session_id);
825 }
826
827 health_code_update();
828
829 ret = send_response(conn->sock, &reply, sizeof(reply));
830 if (ret < 0) {
831 goto end;
832 }
833
834 health_code_update();
835
836 DBG("Version check done using protocol %u.%u", conn->major, conn->minor);
837 ret = 0;
838
839 end:
840 return ret;
841 }
842
843 /*
844 * Send the viewer the list of current sessions.
845 * We need to create a copy of the hash table content because otherwise
846 * we cannot assume the number of entries stays the same between getting
847 * the number of HT elements and iteration over the HT.
848 *
849 * Return 0 on success or else a negative value.
850 */
851 static
852 int viewer_list_sessions(struct relay_connection *conn)
853 {
854 int ret = 0;
855 struct lttng_viewer_list_sessions session_list;
856 struct lttng_ht_iter iter;
857 struct relay_session *session;
858 struct lttng_viewer_session *send_session_buf = NULL;
859 uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT;
860 uint32_t count = 0;
861
862 DBG("List sessions received");
863
864 send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf));
865 if (!send_session_buf) {
866 return -1;
867 }
868
869 rcu_read_lock();
870 cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
871 session_n.node) {
872 struct lttng_viewer_session *send_session;
873
874 health_code_update();
875
876 pthread_mutex_lock(&session->lock);
877 if (session->connection_closed) {
878 /* Skip closed session */
879 goto next_session;
880 }
881 if (!session->current_trace_chunk) {
882 /*
883 * Skip un-attachable session. It is either
884 * being destroyed or has not had a trace
885 * chunk created against it yet.
886 */
887 goto next_session;
888 }
889
890 if (count >= buf_count) {
891 struct lttng_viewer_session *newbuf;
892 uint32_t new_buf_count = buf_count << 1;
893
894 newbuf = realloc(send_session_buf,
895 new_buf_count * sizeof(*send_session_buf));
896 if (!newbuf) {
897 ret = -1;
898 goto break_loop;
899 }
900 send_session_buf = newbuf;
901 buf_count = new_buf_count;
902 }
903 send_session = &send_session_buf[count];
904 if (lttng_strncpy(send_session->session_name,
905 session->session_name,
906 sizeof(send_session->session_name))) {
907 ret = -1;
908 goto break_loop;
909 }
910 if (lttng_strncpy(send_session->hostname, session->hostname,
911 sizeof(send_session->hostname))) {
912 ret = -1;
913 goto break_loop;
914 }
915 send_session->id = htobe64(session->id);
916 send_session->live_timer = htobe32(session->live_timer);
917 if (session->viewer_attached) {
918 send_session->clients = htobe32(1);
919 } else {
920 send_session->clients = htobe32(0);
921 }
922 send_session->streams = htobe32(session->stream_count);
923 count++;
924 next_session:
925 pthread_mutex_unlock(&session->lock);
926 continue;
927 break_loop:
928 pthread_mutex_unlock(&session->lock);
929 break;
930 }
931 rcu_read_unlock();
932 if (ret < 0) {
933 goto end_free;
934 }
935
936 session_list.sessions_count = htobe32(count);
937
938 health_code_update();
939
940 ret = send_response(conn->sock, &session_list, sizeof(session_list));
941 if (ret < 0) {
942 goto end_free;
943 }
944
945 health_code_update();
946
947 ret = send_response(conn->sock, send_session_buf,
948 count * sizeof(*send_session_buf));
949 if (ret < 0) {
950 goto end_free;
951 }
952 health_code_update();
953
954 ret = 0;
955 end_free:
956 free(send_session_buf);
957 return ret;
958 }
959
960 /*
961 * Send the viewer the list of current streams.
962 */
963 static
964 int viewer_get_new_streams(struct relay_connection *conn)
965 {
966 int ret, send_streams = 0;
967 uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0;
968 struct lttng_viewer_new_streams_request request;
969 struct lttng_viewer_new_streams_response response;
970 struct relay_session *session = NULL;
971 uint64_t session_id;
972 bool closed = false;
973
974 assert(conn);
975
976 DBG("Get new streams received");
977
978 health_code_update();
979
980 /* Receive the request from the connected client. */
981 ret = recv_request(conn->sock, &request, sizeof(request));
982 if (ret < 0) {
983 goto error;
984 }
985 session_id = be64toh(request.session_id);
986
987 health_code_update();
988
989 memset(&response, 0, sizeof(response));
990
991 session = session_get_by_id(session_id);
992 if (!session) {
993 DBG("Relay session %" PRIu64 " not found", session_id);
994 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
995 goto send_reply;
996 }
997
998 if (!viewer_session_is_attached(conn->viewer_session, session)) {
999 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
1000 goto send_reply;
1001 }
1002
1003 pthread_mutex_lock(&session->lock);
1004 ret = make_viewer_streams(session,
1005 conn->viewer_session->current_trace_chunk,
1006 LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent,
1007 &nb_created, &closed);
1008 if (ret < 0) {
1009 goto error_unlock_session;
1010 }
1011 send_streams = 1;
1012 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
1013
1014 /* Only send back the newly created streams with the unsent ones. */
1015 nb_streams = nb_created + nb_unsent;
1016 response.streams_count = htobe32(nb_streams);
1017
1018 /*
1019 * If the session is closed, HUP when there are no more streams
1020 * with data.
1021 */
1022 if (closed && nb_total == 0) {
1023 send_streams = 0;
1024 response.streams_count = 0;
1025 response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
1026 goto send_reply_unlock;
1027 }
1028 send_reply_unlock:
1029 pthread_mutex_unlock(&session->lock);
1030
1031 send_reply:
1032 health_code_update();
1033 ret = send_response(conn->sock, &response, sizeof(response));
1034 if (ret < 0) {
1035 goto end_put_session;
1036 }
1037 health_code_update();
1038
1039 /*
1040 * Unknown or empty session, just return gracefully, the viewer
1041 * knows what is happening.
1042 */
1043 if (!send_streams || !nb_streams) {
1044 ret = 0;
1045 goto end_put_session;
1046 }
1047
1048 /*
1049 * Send stream and *DON'T* ignore the sent flag so every viewer
1050 * streams that were not sent from that point will be sent to
1051 * the viewer.
1052 */
1053 ret = send_viewer_streams(conn->sock, session_id, 0);
1054 if (ret < 0) {
1055 goto end_put_session;
1056 }
1057
1058 end_put_session:
1059 if (session) {
1060 session_put(session);
1061 }
1062 error:
1063 return ret;
1064 error_unlock_session:
1065 pthread_mutex_unlock(&session->lock);
1066 session_put(session);
1067 return ret;
1068 }
1069
1070 /*
1071 * Send the viewer the list of current sessions.
1072 */
1073 static
1074 int viewer_attach_session(struct relay_connection *conn)
1075 {
1076 int send_streams = 0;
1077 ssize_t ret;
1078 uint32_t nb_streams = 0;
1079 enum lttng_viewer_seek seek_type;
1080 struct lttng_viewer_attach_session_request request;
1081 struct lttng_viewer_attach_session_response response;
1082 struct relay_session *session = NULL;
1083 enum lttng_viewer_attach_return_code viewer_attach_status;
1084 bool closed = false;
1085 uint64_t session_id;
1086
1087 assert(conn);
1088
1089 health_code_update();
1090
1091 /* Receive the request from the connected client. */
1092 ret = recv_request(conn->sock, &request, sizeof(request));
1093 if (ret < 0) {
1094 goto error;
1095 }
1096
1097 session_id = be64toh(request.session_id);
1098 health_code_update();
1099
1100 memset(&response, 0, sizeof(response));
1101
1102 if (!conn->viewer_session) {
1103 DBG("Client trying to attach before creating a live viewer session");
1104 response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION);
1105 goto send_reply;
1106 }
1107
1108 session = session_get_by_id(session_id);
1109 if (!session) {
1110 DBG("Relay session %" PRIu64 " not found", session_id);
1111 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
1112 goto send_reply;
1113 }
1114 DBG("Attach session ID %" PRIu64 " received", session_id);
1115
1116 pthread_mutex_lock(&session->lock);
1117 if (!session->current_trace_chunk) {
1118 /*
1119 * Session is either being destroyed or it never had a trace
1120 * chunk created against it.
1121 */
1122 DBG("Session requested by live client has no current trace chunk, returning unknown session");
1123 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
1124 goto send_reply;
1125 }
1126 if (session->live_timer == 0) {
1127 DBG("Not live session");
1128 response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE);
1129 goto send_reply;
1130 }
1131
1132 send_streams = 1;
1133 viewer_attach_status = viewer_session_attach(conn->viewer_session,
1134 session);
1135 if (viewer_attach_status != LTTNG_VIEWER_ATTACH_OK) {
1136 response.status = htobe32(viewer_attach_status);
1137 goto send_reply;
1138 }
1139
1140 switch (be32toh(request.seek)) {
1141 case LTTNG_VIEWER_SEEK_BEGINNING:
1142 case LTTNG_VIEWER_SEEK_LAST:
1143 response.status = htobe32(LTTNG_VIEWER_ATTACH_OK);
1144 seek_type = be32toh(request.seek);
1145 break;
1146 default:
1147 ERR("Wrong seek parameter");
1148 response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR);
1149 send_streams = 0;
1150 goto send_reply;
1151 }
1152
1153 ret = make_viewer_streams(session,
1154 conn->viewer_session->current_trace_chunk, seek_type,
1155 &nb_streams, NULL, NULL, &closed);
1156 if (ret < 0) {
1157 goto end_put_session;
1158 }
1159 pthread_mutex_unlock(&session->lock);
1160 session_put(session);
1161 session = NULL;
1162
1163 response.streams_count = htobe32(nb_streams);
1164 /*
1165 * If the session is closed when the viewer is attaching, it
1166 * means some of the streams may have been concurrently removed,
1167 * so we don't allow the viewer to attach, even if there are
1168 * streams available.
1169 */
1170 if (closed) {
1171 send_streams = 0;
1172 response.streams_count = 0;
1173 response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
1174 goto send_reply;
1175 }
1176
1177 send_reply:
1178 health_code_update();
1179 ret = send_response(conn->sock, &response, sizeof(response));
1180 if (ret < 0) {
1181 goto end_put_session;
1182 }
1183 health_code_update();
1184
1185 /*
1186 * Unknown or empty session, just return gracefully, the viewer
1187 * knows what is happening.
1188 */
1189 if (!send_streams || !nb_streams) {
1190 ret = 0;
1191 goto end_put_session;
1192 }
1193
1194 /* Send stream and ignore the sent flag. */
1195 ret = send_viewer_streams(conn->sock, session_id, 1);
1196 if (ret < 0) {
1197 goto end_put_session;
1198 }
1199
1200 end_put_session:
1201 if (session) {
1202 pthread_mutex_unlock(&session->lock);
1203 session_put(session);
1204 }
1205 error:
1206 return ret;
1207 }
1208
1209 /*
1210 * Open the index file if needed for the given vstream.
1211 *
1212 * If an index file is successfully opened, the vstream will set it as its
1213 * current index file.
1214 *
1215 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1216 *
1217 * Called with rstream lock held.
1218 */
1219 static int try_open_index(struct relay_viewer_stream *vstream,
1220 struct relay_stream *rstream)
1221 {
1222 int ret = 0;
1223 const uint32_t connection_major = rstream->trace->session->major;
1224 const uint32_t connection_minor = rstream->trace->session->minor;
1225 enum lttng_trace_chunk_status chunk_status;
1226
1227 if (vstream->index_file) {
1228 goto end;
1229 }
1230
1231 /*
1232 * First time, we open the index file and at least one index is ready.
1233 */
1234 if (rstream->index_received_seqcount == 0) {
1235 ret = -ENOENT;
1236 goto end;
1237 }
1238 chunk_status = lttng_index_file_create_from_trace_chunk_read_only(
1239 vstream->stream_file.trace_chunk, rstream->path_name,
1240 rstream->channel_name, rstream->tracefile_size,
1241 vstream->current_tracefile_id,
1242 lttng_to_index_major(connection_major, connection_minor),
1243 lttng_to_index_minor(connection_major, connection_minor),
1244 true, &vstream->index_file);
1245 if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1246 if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NO_FILE) {
1247 ret = -ENOENT;
1248 } else {
1249 ret = -1;
1250 }
1251 }
1252
1253 end:
1254 return ret;
1255 }
1256
1257 /*
1258 * Check the status of the index for the given stream. This function
1259 * updates the index structure if needed and can put (close) the vstream
1260 * in the HUP situation.
1261 *
1262 * Return 0 means that we can proceed with the index. A value of 1 means
1263 * that the index has been updated and is ready to be sent to the
1264 * client. A negative value indicates an error that can't be handled.
1265 *
1266 * Called with rstream lock held.
1267 */
1268 static int check_index_status(struct relay_viewer_stream *vstream,
1269 struct relay_stream *rstream, struct ctf_trace *trace,
1270 struct lttng_viewer_index *index)
1271 {
1272 int ret;
1273
1274 if ((trace->session->connection_closed || rstream->closed)
1275 && rstream->index_received_seqcount
1276 == vstream->index_sent_seqcount) {
1277 /*
1278 * Last index sent and session connection or relay
1279 * stream are closed.
1280 */
1281 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1282 goto hup;
1283 } else if (rstream->beacon_ts_end != -1ULL &&
1284 rstream->index_received_seqcount
1285 == vstream->index_sent_seqcount) {
1286 /*
1287 * We've received a synchronization beacon and the last index
1288 * available has been sent, the index for now is inactive.
1289 *
1290 * In this case, we have received a beacon which allows us to
1291 * inform the client of a time interval during which we can
1292 * guarantee that there are no events to read (and never will
1293 * be).
1294 */
1295 index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
1296 index->timestamp_end = htobe64(rstream->beacon_ts_end);
1297 index->stream_id = htobe64(rstream->ctf_stream_id);
1298 goto index_ready;
1299 } else if (rstream->index_received_seqcount
1300 == vstream->index_sent_seqcount) {
1301 /*
1302 * This checks whether received == sent seqcount. In
1303 * this case, we have not received a beacon. Therefore,
1304 * we can only ask the client to retry later.
1305 */
1306 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1307 goto index_ready;
1308 } else if (!tracefile_array_seq_in_file(rstream->tfa,
1309 vstream->current_tracefile_id,
1310 vstream->index_sent_seqcount)) {
1311 /*
1312 * The next index we want to send cannot be read either
1313 * because we need to perform a rotation, or due to
1314 * the producer having overwritten its trace file.
1315 */
1316 DBG("Viewer stream %" PRIu64 " rotation",
1317 vstream->stream->stream_handle);
1318 ret = viewer_stream_rotate(vstream);
1319 if (ret < 0) {
1320 goto end;
1321 } else if (ret == 1) {
1322 /* EOF across entire stream. */
1323 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1324 goto hup;
1325 }
1326 /*
1327 * If we have been pushed due to overwrite, it
1328 * necessarily means there is data that can be read in
1329 * the stream. If we rotated because we reached the end
1330 * of a tracefile, it means the following tracefile
1331 * needs to contain at least one index, else we would
1332 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1333 * viewer. The updated index_sent_seqcount needs to
1334 * point to a readable index entry now.
1335 *
1336 * In the case where we "rotate" on a single file, we
1337 * can end up in a case where the requested index is
1338 * still unavailable.
1339 */
1340 if (rstream->tracefile_count == 1 &&
1341 !tracefile_array_seq_in_file(
1342 rstream->tfa,
1343 vstream->current_tracefile_id,
1344 vstream->index_sent_seqcount)) {
1345 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1346 goto index_ready;
1347 }
1348 assert(tracefile_array_seq_in_file(rstream->tfa,
1349 vstream->current_tracefile_id,
1350 vstream->index_sent_seqcount));
1351 }
1352 /* ret == 0 means successful so we continue. */
1353 ret = 0;
1354 end:
1355 return ret;
1356
1357 hup:
1358 viewer_stream_put(vstream);
1359 index_ready:
1360 return 1;
1361 }
1362
1363 /*
1364 * Send the next index for a stream.
1365 *
1366 * Return 0 on success or else a negative value.
1367 */
1368 static
1369 int viewer_get_next_index(struct relay_connection *conn)
1370 {
1371 int ret;
1372 struct lttng_viewer_get_next_index request_index;
1373 struct lttng_viewer_index viewer_index;
1374 struct ctf_packet_index packet_index;
1375 struct relay_viewer_stream *vstream = NULL;
1376 struct relay_stream *rstream = NULL;
1377 struct ctf_trace *ctf_trace = NULL;
1378 struct relay_viewer_stream *metadata_viewer_stream = NULL;
1379
1380 assert(conn);
1381
1382 DBG("Viewer get next index");
1383
1384 memset(&viewer_index, 0, sizeof(viewer_index));
1385 health_code_update();
1386
1387 ret = recv_request(conn->sock, &request_index, sizeof(request_index));
1388 if (ret < 0) {
1389 goto end;
1390 }
1391 health_code_update();
1392
1393 vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id));
1394 if (!vstream) {
1395 DBG("Client requested index of unknown stream id %" PRIu64,
1396 (uint64_t) be64toh(request_index.stream_id));
1397 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1398 goto send_reply;
1399 }
1400
1401 /* Use back. ref. Protected by refcounts. */
1402 rstream = vstream->stream;
1403 ctf_trace = rstream->trace;
1404
1405 /* metadata_viewer_stream may be NULL. */
1406 metadata_viewer_stream =
1407 ctf_trace_get_viewer_metadata_stream(ctf_trace);
1408
1409 pthread_mutex_lock(&rstream->lock);
1410
1411 /*
1412 * The viewer should not ask for index on metadata stream.
1413 */
1414 if (rstream->is_metadata) {
1415 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1416 goto send_reply;
1417 }
1418
1419 /* Try to open an index if one is needed for that stream. */
1420 ret = try_open_index(vstream, rstream);
1421 if (ret < 0) {
1422 if (ret == -ENOENT) {
1423 /*
1424 * The index is created only when the first data
1425 * packet arrives, it might not be ready at the
1426 * beginning of the session
1427 */
1428 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1429 } else {
1430 /* Unhandled error. */
1431 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1432 }
1433 goto send_reply;
1434 }
1435
1436 ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
1437 if (ret < 0) {
1438 goto error_put;
1439 } else if (ret == 1) {
1440 /*
1441 * We have no index to send and check_index_status has populated
1442 * viewer_index's status.
1443 */
1444 goto send_reply;
1445 }
1446 /* At this point, ret is 0 thus we will be able to read the index. */
1447 assert(!ret);
1448
1449 /*
1450 * vstream->stream_fd may be NULL if it has been closed by
1451 * tracefile rotation, or if we are at the beginning of the
1452 * stream. We open the data stream file here to protect against
1453 * overwrite caused by tracefile rotation (in association with
1454 * unlink performed before overwrite).
1455 */
1456 if (!vstream->stream_file.fd) {
1457 int fd;
1458 char file_path[LTTNG_PATH_MAX];
1459 enum lttng_trace_chunk_status status;
1460
1461 ret = utils_stream_file_path(rstream->path_name,
1462 rstream->channel_name, rstream->tracefile_size,
1463 vstream->current_tracefile_id, NULL, file_path,
1464 sizeof(file_path));
1465 if (ret < 0) {
1466 goto error_put;
1467 }
1468
1469 /*
1470 * It is possible the the file we are trying to open is
1471 * missing if the stream has been closed (application exits with
1472 * per-pid buffers) and a clear command has been performed.
1473 */
1474 status = lttng_trace_chunk_open_file(
1475 vstream->stream_file.trace_chunk,
1476 file_path, O_RDONLY, 0, &fd, true);
1477 if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1478 PERROR("Failed to open trace file for viewer stream");
1479 goto error_put;
1480 }
1481 vstream->stream_file.fd = stream_fd_create(fd);
1482 if (!vstream->stream_file.fd) {
1483 if (close(fd)) {
1484 PERROR("Failed to close viewer stream file");
1485 }
1486 goto error_put;
1487 }
1488 }
1489
1490 ret = check_new_streams(conn);
1491 if (ret < 0) {
1492 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1493 goto send_reply;
1494 } else if (ret == 1) {
1495 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
1496 }
1497
1498 ret = lttng_index_file_read(vstream->index_file, &packet_index);
1499 if (ret) {
1500 ERR("Relay error reading index file %d",
1501 vstream->index_file->fd);
1502 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1503 goto send_reply;
1504 } else {
1505 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
1506 vstream->index_sent_seqcount++;
1507 }
1508
1509 /*
1510 * Indexes are stored in big endian, no need to switch before sending.
1511 */
1512 DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64,
1513 rstream->stream_handle,
1514 (uint64_t) be64toh(packet_index.offset));
1515 viewer_index.offset = packet_index.offset;
1516 viewer_index.packet_size = packet_index.packet_size;
1517 viewer_index.content_size = packet_index.content_size;
1518 viewer_index.timestamp_begin = packet_index.timestamp_begin;
1519 viewer_index.timestamp_end = packet_index.timestamp_end;
1520 viewer_index.events_discarded = packet_index.events_discarded;
1521 viewer_index.stream_id = packet_index.stream_id;
1522
1523 send_reply:
1524 if (rstream) {
1525 pthread_mutex_unlock(&rstream->lock);
1526 }
1527
1528 if (metadata_viewer_stream) {
1529 pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
1530 DBG("get next index metadata check: recv %" PRIu64
1531 " sent %" PRIu64,
1532 metadata_viewer_stream->stream->metadata_received,
1533 metadata_viewer_stream->metadata_sent);
1534 if (!metadata_viewer_stream->stream->metadata_received ||
1535 metadata_viewer_stream->stream->metadata_received >
1536 metadata_viewer_stream->metadata_sent) {
1537 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
1538 }
1539 pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
1540 }
1541
1542 viewer_index.flags = htobe32(viewer_index.flags);
1543 health_code_update();
1544
1545 ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index));
1546 if (ret < 0) {
1547 goto end;
1548 }
1549 health_code_update();
1550
1551 if (vstream) {
1552 DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
1553 vstream->index_sent_seqcount,
1554 vstream->stream->stream_handle);
1555 }
1556 end:
1557 if (metadata_viewer_stream) {
1558 viewer_stream_put(metadata_viewer_stream);
1559 }
1560 if (vstream) {
1561 viewer_stream_put(vstream);
1562 }
1563 return ret;
1564
1565 error_put:
1566 pthread_mutex_unlock(&rstream->lock);
1567 if (metadata_viewer_stream) {
1568 viewer_stream_put(metadata_viewer_stream);
1569 }
1570 viewer_stream_put(vstream);
1571 return ret;
1572 }
1573
1574 /*
1575 * Send the next index for a stream
1576 *
1577 * Return 0 on success or else a negative value.
1578 */
1579 static
1580 int viewer_get_packet(struct relay_connection *conn)
1581 {
1582 int ret;
1583 off_t lseek_ret;
1584 char *reply = NULL;
1585 struct lttng_viewer_get_packet get_packet_info;
1586 struct lttng_viewer_trace_packet reply_header;
1587 struct relay_viewer_stream *vstream = NULL;
1588 uint32_t reply_size = sizeof(reply_header);
1589 uint32_t packet_data_len = 0;
1590 ssize_t read_len;
1591
1592 DBG2("Relay get data packet");
1593
1594 health_code_update();
1595
1596 ret = recv_request(conn->sock, &get_packet_info,
1597 sizeof(get_packet_info));
1598 if (ret < 0) {
1599 goto end;
1600 }
1601 health_code_update();
1602
1603 /* From this point on, the error label can be reached. */
1604 memset(&reply_header, 0, sizeof(reply_header));
1605
1606 vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id));
1607 if (!vstream) {
1608 DBG("Client requested packet of unknown stream id %" PRIu64,
1609 (uint64_t) be64toh(get_packet_info.stream_id));
1610 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1611 goto send_reply_nolock;
1612 } else {
1613 packet_data_len = be32toh(get_packet_info.len);
1614 reply_size += packet_data_len;
1615 }
1616
1617 reply = zmalloc(reply_size);
1618 if (!reply) {
1619 PERROR("packet reply zmalloc");
1620 reply_size = sizeof(reply_header);
1621 goto error;
1622 }
1623
1624 pthread_mutex_lock(&vstream->stream->lock);
1625 lseek_ret = lseek(vstream->stream_file.fd->fd,
1626 be64toh(get_packet_info.offset), SEEK_SET);
1627 if (lseek_ret < 0) {
1628 PERROR("lseek fd %d to offset %" PRIu64,
1629 vstream->stream_file.fd->fd,
1630 (uint64_t) be64toh(get_packet_info.offset));
1631 goto error;
1632 }
1633 read_len = lttng_read(vstream->stream_file.fd->fd,
1634 reply + sizeof(reply_header), packet_data_len);
1635 if (read_len < packet_data_len) {
1636 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
1637 vstream->stream_file.fd->fd,
1638 (uint64_t) be64toh(get_packet_info.offset));
1639 goto error;
1640 }
1641 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK);
1642 reply_header.len = htobe32(packet_data_len);
1643 goto send_reply;
1644
1645 error:
1646 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1647
1648 send_reply:
1649 if (vstream) {
1650 pthread_mutex_unlock(&vstream->stream->lock);
1651 }
1652 send_reply_nolock:
1653
1654 health_code_update();
1655
1656 if (reply) {
1657 memcpy(reply, &reply_header, sizeof(reply_header));
1658 ret = send_response(conn->sock, reply, reply_size);
1659 } else {
1660 /* No reply to send. */
1661 ret = send_response(conn->sock, &reply_header,
1662 reply_size);
1663 }
1664
1665 health_code_update();
1666 if (ret < 0) {
1667 PERROR("sendmsg of packet data failed");
1668 goto end_free;
1669 }
1670
1671 DBG("Sent %u bytes for stream %" PRIu64, reply_size,
1672 (uint64_t) be64toh(get_packet_info.stream_id));
1673
1674 end_free:
1675 free(reply);
1676 end:
1677 if (vstream) {
1678 viewer_stream_put(vstream);
1679 }
1680 return ret;
1681 }
1682
1683 /*
1684 * Send the session's metadata
1685 *
1686 * Return 0 on success else a negative value.
1687 */
1688 static
1689 int viewer_get_metadata(struct relay_connection *conn)
1690 {
1691 int ret = 0;
1692 ssize_t read_len;
1693 uint64_t len = 0;
1694 char *data = NULL;
1695 struct lttng_viewer_get_metadata request;
1696 struct lttng_viewer_metadata_packet reply;
1697 struct relay_viewer_stream *vstream = NULL;
1698
1699 assert(conn);
1700
1701 DBG("Relay get metadata");
1702
1703 health_code_update();
1704
1705 ret = recv_request(conn->sock, &request, sizeof(request));
1706 if (ret < 0) {
1707 goto end;
1708 }
1709 health_code_update();
1710
1711 memset(&reply, 0, sizeof(reply));
1712
1713 vstream = viewer_stream_get_by_id(be64toh(request.stream_id));
1714 if (!vstream) {
1715 /*
1716 * The metadata stream can be closed by a CLOSE command
1717 * just before we attach. It can also be closed by
1718 * per-pid tracing during tracing. Therefore, it is
1719 * possible that we cannot find this viewer stream.
1720 * Reply back to the client with an error if we cannot
1721 * find it.
1722 */
1723 DBG("Client requested metadata of unknown stream id %" PRIu64,
1724 (uint64_t) be64toh(request.stream_id));
1725 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
1726 goto send_reply;
1727 }
1728 pthread_mutex_lock(&vstream->stream->lock);
1729 if (!vstream->stream->is_metadata) {
1730 ERR("Invalid metadata stream");
1731 goto error;
1732 }
1733
1734 assert(vstream->metadata_sent <= vstream->stream->metadata_received);
1735
1736 len = vstream->stream->metadata_received - vstream->metadata_sent;
1737 if (len == 0) {
1738 /*
1739 * The live viewers expect to receive a NO_NEW_METADATA
1740 * status before a stream disappears, otherwise they abort the
1741 * entire live connection when receiving an error status.
1742 */
1743 reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
1744 /*
1745 * The live viewer considers a closed 0 byte metadata stream as
1746 * an error.
1747 */
1748 if (vstream->metadata_sent > 0) {
1749 vstream->stream->no_new_metadata_notified = true;
1750 if (vstream->stream->closed) {
1751 /* Release ownership for the viewer metadata stream. */
1752 viewer_stream_put(vstream);
1753 }
1754 }
1755 goto send_reply;
1756 }
1757
1758 /* first time, we open the metadata file */
1759 if (!vstream->stream_file.fd) {
1760 int fd;
1761 char file_path[LTTNG_PATH_MAX];
1762 enum lttng_trace_chunk_status status;
1763 struct relay_stream *rstream = vstream->stream;
1764
1765 ret = utils_stream_file_path(rstream->path_name,
1766 rstream->channel_name, rstream->tracefile_size,
1767 vstream->current_tracefile_id, NULL, file_path,
1768 sizeof(file_path));
1769 if (ret < 0) {
1770 goto error;
1771 }
1772
1773 /*
1774 * It is possible the the metadata file we are trying to open is
1775 * missing if the stream has been closed (application exits with
1776 * per-pid buffers) and a clear command has been performed.
1777 */
1778 status = lttng_trace_chunk_open_file(
1779 vstream->stream_file.trace_chunk,
1780 file_path, O_RDONLY, 0, &fd, true);
1781 if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1782 PERROR("Failed to open metadata file for viewer stream");
1783 goto error;
1784 }
1785 vstream->stream_file.fd = stream_fd_create(fd);
1786 if (!vstream->stream_file.fd) {
1787 if (close(fd)) {
1788 PERROR("Failed to close viewer metadata file");
1789 }
1790 goto error;
1791 }
1792 }
1793
1794 reply.len = htobe64(len);
1795 data = zmalloc(len);
1796 if (!data) {
1797 PERROR("viewer metadata zmalloc");
1798 goto error;
1799 }
1800
1801 read_len = lttng_read(vstream->stream_file.fd->fd, data, len);
1802 if (read_len < len) {
1803 PERROR("Relay reading metadata file");
1804 goto error;
1805 }
1806 vstream->metadata_sent += read_len;
1807 reply.status = htobe32(LTTNG_VIEWER_METADATA_OK);
1808
1809 goto send_reply;
1810
1811 error:
1812 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
1813
1814 send_reply:
1815 health_code_update();
1816 if (vstream) {
1817 pthread_mutex_unlock(&vstream->stream->lock);
1818 }
1819 ret = send_response(conn->sock, &reply, sizeof(reply));
1820 if (ret < 0) {
1821 goto end_free;
1822 }
1823 health_code_update();
1824
1825 if (len > 0) {
1826 ret = send_response(conn->sock, data, len);
1827 if (ret < 0) {
1828 goto end_free;
1829 }
1830 }
1831
1832 DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
1833 (uint64_t) be64toh(request.stream_id));
1834
1835 DBG("Metadata sent");
1836
1837 end_free:
1838 free(data);
1839 end:
1840 if (vstream) {
1841 viewer_stream_put(vstream);
1842 }
1843 return ret;
1844 }
1845
1846 /*
1847 * Create a viewer session.
1848 *
1849 * Return 0 on success or else a negative value.
1850 */
1851 static
1852 int viewer_create_session(struct relay_connection *conn)
1853 {
1854 int ret;
1855 struct lttng_viewer_create_session_response resp;
1856
1857 DBG("Viewer create session received");
1858
1859 memset(&resp, 0, sizeof(resp));
1860 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK);
1861 conn->viewer_session = viewer_session_create();
1862 if (!conn->viewer_session) {
1863 ERR("Allocation viewer session");
1864 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR);
1865 goto send_reply;
1866 }
1867
1868 send_reply:
1869 health_code_update();
1870 ret = send_response(conn->sock, &resp, sizeof(resp));
1871 if (ret < 0) {
1872 goto end;
1873 }
1874 health_code_update();
1875 ret = 0;
1876
1877 end:
1878 return ret;
1879 }
1880
1881 /*
1882 * Detach a viewer session.
1883 *
1884 * Return 0 on success or else a negative value.
1885 */
1886 static
1887 int viewer_detach_session(struct relay_connection *conn)
1888 {
1889 int ret;
1890 struct lttng_viewer_detach_session_response response;
1891 struct lttng_viewer_detach_session_request request;
1892 struct relay_session *session = NULL;
1893 uint64_t viewer_session_to_close;
1894
1895 DBG("Viewer detach session received");
1896
1897 assert(conn);
1898
1899 health_code_update();
1900
1901 /* Receive the request from the connected client. */
1902 ret = recv_request(conn->sock, &request, sizeof(request));
1903 if (ret < 0) {
1904 goto end;
1905 }
1906 viewer_session_to_close = be64toh(request.session_id);
1907
1908 if (!conn->viewer_session) {
1909 DBG("Client trying to detach before creating a live viewer session");
1910 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
1911 goto send_reply;
1912 }
1913
1914 health_code_update();
1915
1916 memset(&response, 0, sizeof(response));
1917 DBG("Detaching from session ID %" PRIu64, viewer_session_to_close);
1918
1919 session = session_get_by_id(be64toh(request.session_id));
1920 if (!session) {
1921 DBG("Relay session %" PRIu64 " not found",
1922 (uint64_t) be64toh(request.session_id));
1923 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK);
1924 goto send_reply;
1925 }
1926
1927 ret = viewer_session_is_attached(conn->viewer_session, session);
1928 if (ret != 1) {
1929 DBG("Not attached to this session");
1930 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
1931 goto send_reply_put;
1932 }
1933
1934 viewer_session_close_one_session(conn->viewer_session, session);
1935 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK);
1936 DBG("Session %" PRIu64 " detached.", viewer_session_to_close);
1937
1938 send_reply_put:
1939 session_put(session);
1940
1941 send_reply:
1942 health_code_update();
1943 ret = send_response(conn->sock, &response, sizeof(response));
1944 if (ret < 0) {
1945 goto end;
1946 }
1947 health_code_update();
1948 ret = 0;
1949
1950 end:
1951 return ret;
1952 }
1953
1954 /*
1955 * live_relay_unknown_command: send -1 if received unknown command
1956 */
1957 static
1958 void live_relay_unknown_command(struct relay_connection *conn)
1959 {
1960 struct lttcomm_relayd_generic_reply reply;
1961
1962 memset(&reply, 0, sizeof(reply));
1963 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1964 (void) send_response(conn->sock, &reply, sizeof(reply));
1965 }
1966
1967 /*
1968 * Process the commands received on the control socket
1969 */
1970 static
1971 int process_control(struct lttng_viewer_cmd *recv_hdr,
1972 struct relay_connection *conn)
1973 {
1974 int ret = 0;
1975 uint32_t msg_value;
1976
1977 msg_value = be32toh(recv_hdr->cmd);
1978
1979 /*
1980 * Make sure we've done the version check before any command other then a
1981 * new client connection.
1982 */
1983 if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) {
1984 ERR("Viewer conn value %" PRIu32 " before version check", msg_value);
1985 ret = -1;
1986 goto end;
1987 }
1988
1989 switch (msg_value) {
1990 case LTTNG_VIEWER_CONNECT:
1991 ret = viewer_connect(conn);
1992 break;
1993 case LTTNG_VIEWER_LIST_SESSIONS:
1994 ret = viewer_list_sessions(conn);
1995 break;
1996 case LTTNG_VIEWER_ATTACH_SESSION:
1997 ret = viewer_attach_session(conn);
1998 break;
1999 case LTTNG_VIEWER_GET_NEXT_INDEX:
2000 ret = viewer_get_next_index(conn);
2001 break;
2002 case LTTNG_VIEWER_GET_PACKET:
2003 ret = viewer_get_packet(conn);
2004 break;
2005 case LTTNG_VIEWER_GET_METADATA:
2006 ret = viewer_get_metadata(conn);
2007 break;
2008 case LTTNG_VIEWER_GET_NEW_STREAMS:
2009 ret = viewer_get_new_streams(conn);
2010 break;
2011 case LTTNG_VIEWER_CREATE_SESSION:
2012 ret = viewer_create_session(conn);
2013 break;
2014 case LTTNG_VIEWER_DETACH_SESSION:
2015 ret = viewer_detach_session(conn);
2016 break;
2017 default:
2018 ERR("Received unknown viewer command (%u)",
2019 be32toh(recv_hdr->cmd));
2020 live_relay_unknown_command(conn);
2021 ret = -1;
2022 goto end;
2023 }
2024
2025 end:
2026 return ret;
2027 }
2028
2029 static
2030 void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
2031 {
2032 int ret;
2033
2034 (void) lttng_poll_del(events, pollfd);
2035
2036 ret = close(pollfd);
2037 if (ret < 0) {
2038 ERR("Closing pollfd %d", pollfd);
2039 }
2040 }
2041
2042 /*
2043 * This thread does the actual work
2044 */
2045 static
2046 void *thread_worker(void *data)
2047 {
2048 int ret, err = -1;
2049 uint32_t nb_fd;
2050 struct lttng_poll_event events;
2051 struct lttng_ht *viewer_connections_ht;
2052 struct lttng_ht_iter iter;
2053 struct lttng_viewer_cmd recv_hdr;
2054 struct relay_connection *destroy_conn;
2055
2056 DBG("[thread] Live viewer relay worker started");
2057
2058 rcu_register_thread();
2059
2060 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
2061
2062 if (testpoint(relayd_thread_live_worker)) {
2063 goto error_testpoint;
2064 }
2065
2066 /* table of connections indexed on socket */
2067 viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2068 if (!viewer_connections_ht) {
2069 goto viewer_connections_ht_error;
2070 }
2071
2072 ret = create_thread_poll_set(&events, 2);
2073 if (ret < 0) {
2074 goto error_poll_create;
2075 }
2076
2077 ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
2078 if (ret < 0) {
2079 goto error;
2080 }
2081
2082 restart:
2083 while (1) {
2084 int i;
2085
2086 health_code_update();
2087
2088 /* Infinite blocking call, waiting for transmission */
2089 DBG3("Relayd live viewer worker thread polling...");
2090 health_poll_entry();
2091 ret = lttng_poll_wait(&events, -1);
2092 health_poll_exit();
2093 if (ret < 0) {
2094 /*
2095 * Restart interrupted system call.
2096 */
2097 if (errno == EINTR) {
2098 goto restart;
2099 }
2100 goto error;
2101 }
2102
2103 nb_fd = ret;
2104
2105 /*
2106 * Process control. The control connection is prioritised so we don't
2107 * starve it with high throughput tracing data on the data
2108 * connection.
2109 */
2110 for (i = 0; i < nb_fd; i++) {
2111 /* Fetch once the poll data */
2112 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
2113 int pollfd = LTTNG_POLL_GETFD(&events, i);
2114
2115 health_code_update();
2116
2117 /* Thread quit pipe has been closed. Killing thread. */
2118 ret = check_thread_quit_pipe(pollfd, revents);
2119 if (ret) {
2120 err = 0;
2121 goto exit;
2122 }
2123
2124 /* Inspect the relay conn pipe for new connection. */
2125 if (pollfd == live_conn_pipe[0]) {
2126 if (revents & LPOLLIN) {
2127 struct relay_connection *conn;
2128
2129 ret = lttng_read(live_conn_pipe[0],
2130 &conn, sizeof(conn));
2131 if (ret < 0) {
2132 goto error;
2133 }
2134 ret = lttng_poll_add(&events,
2135 conn->sock->fd,
2136 LPOLLIN | LPOLLRDHUP);
2137 if (ret) {
2138 ERR("Failed to add new live connection file descriptor to poll set");
2139 goto error;
2140 }
2141 connection_ht_add(viewer_connections_ht, conn);
2142 DBG("Connection socket %d added to poll", conn->sock->fd);
2143 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2144 ERR("Relay live pipe error");
2145 goto error;
2146 } else {
2147 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2148 goto error;
2149 }
2150 } else {
2151 /* Connection activity. */
2152 struct relay_connection *conn;
2153
2154 conn = connection_get_by_sock(viewer_connections_ht, pollfd);
2155 if (!conn) {
2156 continue;
2157 }
2158
2159 if (revents & LPOLLIN) {
2160 ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
2161 sizeof(recv_hdr), 0);
2162 if (ret <= 0) {
2163 /* Connection closed. */
2164 cleanup_connection_pollfd(&events, pollfd);
2165 /* Put "create" ownership reference. */
2166 connection_put(conn);
2167 DBG("Viewer control conn closed with %d", pollfd);
2168 } else {
2169 ret = process_control(&recv_hdr, conn);
2170 if (ret < 0) {
2171 /* Clear the session on error. */
2172 cleanup_connection_pollfd(&events, pollfd);
2173 /* Put "create" ownership reference. */
2174 connection_put(conn);
2175 DBG("Viewer connection closed with %d", pollfd);
2176 }
2177 }
2178 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2179 cleanup_connection_pollfd(&events, pollfd);
2180 /* Put "create" ownership reference. */
2181 connection_put(conn);
2182 } else {
2183 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2184 connection_put(conn);
2185 goto error;
2186 }
2187 /* Put local "get_by_sock" reference. */
2188 connection_put(conn);
2189 }
2190 }
2191 }
2192
2193 exit:
2194 error:
2195 lttng_poll_clean(&events);
2196
2197 /* Cleanup remaining connection object. */
2198 rcu_read_lock();
2199 cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter,
2200 destroy_conn,
2201 sock_n.node) {
2202 health_code_update();
2203 connection_put(destroy_conn);
2204 }
2205 rcu_read_unlock();
2206 error_poll_create:
2207 lttng_ht_destroy(viewer_connections_ht);
2208 viewer_connections_ht_error:
2209 /* Close relay conn pipes */
2210 utils_close_pipe(live_conn_pipe);
2211 if (err) {
2212 DBG("Viewer worker thread exited with error");
2213 }
2214 DBG("Viewer worker thread cleanup complete");
2215 error_testpoint:
2216 if (err) {
2217 health_error();
2218 ERR("Health error occurred in %s", __func__);
2219 }
2220 health_unregister(health_relayd);
2221 if (lttng_relay_stop_threads()) {
2222 ERR("Error stopping threads");
2223 }
2224 rcu_unregister_thread();
2225 return NULL;
2226 }
2227
2228 /*
2229 * Create the relay command pipe to wake thread_manage_apps.
2230 * Closed in cleanup().
2231 */
2232 static int create_conn_pipe(void)
2233 {
2234 return utils_create_pipe_cloexec(live_conn_pipe);
2235 }
2236
2237 int relayd_live_join(void)
2238 {
2239 int ret, retval = 0;
2240 void *status;
2241
2242 ret = pthread_join(live_listener_thread, &status);
2243 if (ret) {
2244 errno = ret;
2245 PERROR("pthread_join live listener");
2246 retval = -1;
2247 }
2248
2249 ret = pthread_join(live_worker_thread, &status);
2250 if (ret) {
2251 errno = ret;
2252 PERROR("pthread_join live worker");
2253 retval = -1;
2254 }
2255
2256 ret = pthread_join(live_dispatcher_thread, &status);
2257 if (ret) {
2258 errno = ret;
2259 PERROR("pthread_join live dispatcher");
2260 retval = -1;
2261 }
2262
2263 cleanup_relayd_live();
2264
2265 return retval;
2266 }
2267
2268 /*
2269 * main
2270 */
2271 int relayd_live_create(struct lttng_uri *uri)
2272 {
2273 int ret = 0, retval = 0;
2274 void *status;
2275 int is_root;
2276
2277 if (!uri) {
2278 retval = -1;
2279 goto exit_init_data;
2280 }
2281 live_uri = uri;
2282
2283 /* Check if daemon is UID = 0 */
2284 is_root = !getuid();
2285
2286 if (!is_root) {
2287 if (live_uri->port < 1024) {
2288 ERR("Need to be root to use ports < 1024");
2289 retval = -1;
2290 goto exit_init_data;
2291 }
2292 }
2293
2294 /* Setup the thread apps communication pipe. */
2295 if (create_conn_pipe()) {
2296 retval = -1;
2297 goto exit_init_data;
2298 }
2299
2300 /* Init relay command queue. */
2301 cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail);
2302
2303 /* Set up max poll set size */
2304 if (lttng_poll_set_max_size()) {
2305 retval = -1;
2306 goto exit_init_data;
2307 }
2308
2309 /* Setup the dispatcher thread */
2310 ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(),
2311 thread_dispatcher, (void *) NULL);
2312 if (ret) {
2313 errno = ret;
2314 PERROR("pthread_create viewer dispatcher");
2315 retval = -1;
2316 goto exit_dispatcher_thread;
2317 }
2318
2319 /* Setup the worker thread */
2320 ret = pthread_create(&live_worker_thread, default_pthread_attr(),
2321 thread_worker, NULL);
2322 if (ret) {
2323 errno = ret;
2324 PERROR("pthread_create viewer worker");
2325 retval = -1;
2326 goto exit_worker_thread;
2327 }
2328
2329 /* Setup the listener thread */
2330 ret = pthread_create(&live_listener_thread, default_pthread_attr(),
2331 thread_listener, (void *) NULL);
2332 if (ret) {
2333 errno = ret;
2334 PERROR("pthread_create viewer listener");
2335 retval = -1;
2336 goto exit_listener_thread;
2337 }
2338
2339 /*
2340 * All OK, started all threads.
2341 */
2342 return retval;
2343
2344 /*
2345 * Join on the live_listener_thread should anything be added after
2346 * the live_listener thread's creation.
2347 */
2348
2349 exit_listener_thread:
2350
2351 ret = pthread_join(live_worker_thread, &status);
2352 if (ret) {
2353 errno = ret;
2354 PERROR("pthread_join live worker");
2355 retval = -1;
2356 }
2357 exit_worker_thread:
2358
2359 ret = pthread_join(live_dispatcher_thread, &status);
2360 if (ret) {
2361 errno = ret;
2362 PERROR("pthread_join live dispatcher");
2363 retval = -1;
2364 }
2365 exit_dispatcher_thread:
2366
2367 exit_init_data:
2368 cleanup_relayd_live();
2369
2370 return retval;
2371 }
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