relayd: add extra debug output
[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 DBG("Check index status: index_received_seqcount %" PRIu64 " "
1275 "index_sent_seqcount %" PRIu64 " "
1276 "for stream %" PRIu64,
1277 rstream->index_received_seqcount,
1278 vstream->index_sent_seqcount,
1279 vstream->stream->stream_handle);
1280 if ((trace->session->connection_closed || rstream->closed)
1281 && rstream->index_received_seqcount
1282 == vstream->index_sent_seqcount) {
1283 /*
1284 * Last index sent and session connection or relay
1285 * stream are closed.
1286 */
1287 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1288 goto hup;
1289 } else if (rstream->beacon_ts_end != -1ULL &&
1290 rstream->index_received_seqcount
1291 == vstream->index_sent_seqcount) {
1292 /*
1293 * We've received a synchronization beacon and the last index
1294 * available has been sent, the index for now is inactive.
1295 *
1296 * In this case, we have received a beacon which allows us to
1297 * inform the client of a time interval during which we can
1298 * guarantee that there are no events to read (and never will
1299 * be).
1300 */
1301 index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
1302 index->timestamp_end = htobe64(rstream->beacon_ts_end);
1303 index->stream_id = htobe64(rstream->ctf_stream_id);
1304 DBG("Check index status: inactive with beacon, for stream %" PRIu64,
1305 vstream->stream->stream_handle);
1306 goto index_ready;
1307 } else if (rstream->index_received_seqcount
1308 == vstream->index_sent_seqcount) {
1309 /*
1310 * This checks whether received == sent seqcount. In
1311 * this case, we have not received a beacon. Therefore,
1312 * we can only ask the client to retry later.
1313 */
1314 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1315 DBG("Check index status: retry for stream %" PRIu64,
1316 vstream->stream->stream_handle);
1317 goto index_ready;
1318 } else if (!tracefile_array_seq_in_file(rstream->tfa,
1319 vstream->current_tracefile_id,
1320 vstream->index_sent_seqcount)) {
1321 /*
1322 * The next index we want to send cannot be read either
1323 * because we need to perform a rotation, or due to
1324 * the producer having overwritten its trace file.
1325 */
1326 DBG("Viewer stream %" PRIu64 " rotation",
1327 vstream->stream->stream_handle);
1328 ret = viewer_stream_rotate(vstream);
1329 if (ret < 0) {
1330 goto end;
1331 } else if (ret == 1) {
1332 /* EOF across entire stream. */
1333 index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1334 goto hup;
1335 }
1336 /*
1337 * If we have been pushed due to overwrite, it
1338 * necessarily means there is data that can be read in
1339 * the stream. If we rotated because we reached the end
1340 * of a tracefile, it means the following tracefile
1341 * needs to contain at least one index, else we would
1342 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1343 * viewer. The updated index_sent_seqcount needs to
1344 * point to a readable index entry now.
1345 *
1346 * In the case where we "rotate" on a single file, we
1347 * can end up in a case where the requested index is
1348 * still unavailable.
1349 */
1350 if (rstream->tracefile_count == 1 &&
1351 !tracefile_array_seq_in_file(
1352 rstream->tfa,
1353 vstream->current_tracefile_id,
1354 vstream->index_sent_seqcount)) {
1355 index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1356 DBG("Check index status: retry: "
1357 "tracefile array sequence number %" PRIu64
1358 " not in file for stream %" PRIu64,
1359 vstream->index_sent_seqcount,
1360 vstream->stream->stream_handle);
1361 goto index_ready;
1362 }
1363 assert(tracefile_array_seq_in_file(rstream->tfa,
1364 vstream->current_tracefile_id,
1365 vstream->index_sent_seqcount));
1366 }
1367 /* ret == 0 means successful so we continue. */
1368 ret = 0;
1369 end:
1370 return ret;
1371
1372 hup:
1373 viewer_stream_put(vstream);
1374 index_ready:
1375 return 1;
1376 }
1377
1378 /*
1379 * Send the next index for a stream.
1380 *
1381 * Return 0 on success or else a negative value.
1382 */
1383 static
1384 int viewer_get_next_index(struct relay_connection *conn)
1385 {
1386 int ret;
1387 struct lttng_viewer_get_next_index request_index;
1388 struct lttng_viewer_index viewer_index;
1389 struct ctf_packet_index packet_index;
1390 struct relay_viewer_stream *vstream = NULL;
1391 struct relay_stream *rstream = NULL;
1392 struct ctf_trace *ctf_trace = NULL;
1393 struct relay_viewer_stream *metadata_viewer_stream = NULL;
1394
1395 assert(conn);
1396
1397 DBG("Viewer get next index");
1398
1399 memset(&viewer_index, 0, sizeof(viewer_index));
1400 health_code_update();
1401
1402 ret = recv_request(conn->sock, &request_index, sizeof(request_index));
1403 if (ret < 0) {
1404 goto end;
1405 }
1406 health_code_update();
1407
1408 vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id));
1409 if (!vstream) {
1410 DBG("Client requested index of unknown stream id %" PRIu64,
1411 (uint64_t) be64toh(request_index.stream_id));
1412 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1413 goto send_reply;
1414 }
1415
1416 /* Use back. ref. Protected by refcounts. */
1417 rstream = vstream->stream;
1418 ctf_trace = rstream->trace;
1419
1420 /* metadata_viewer_stream may be NULL. */
1421 metadata_viewer_stream =
1422 ctf_trace_get_viewer_metadata_stream(ctf_trace);
1423
1424 pthread_mutex_lock(&rstream->lock);
1425
1426 /*
1427 * The viewer should not ask for index on metadata stream.
1428 */
1429 if (rstream->is_metadata) {
1430 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
1431 goto send_reply;
1432 }
1433
1434 /* Try to open an index if one is needed for that stream. */
1435 ret = try_open_index(vstream, rstream);
1436 if (ret < 0) {
1437 if (ret == -ENOENT) {
1438 /*
1439 * The index is created only when the first data
1440 * packet arrives, it might not be ready at the
1441 * beginning of the session
1442 */
1443 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
1444 } else {
1445 /* Unhandled error. */
1446 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1447 }
1448 goto send_reply;
1449 }
1450
1451 ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
1452 if (ret < 0) {
1453 goto error_put;
1454 } else if (ret == 1) {
1455 /*
1456 * We have no index to send and check_index_status has populated
1457 * viewer_index's status.
1458 */
1459 goto send_reply;
1460 }
1461 /* At this point, ret is 0 thus we will be able to read the index. */
1462 assert(!ret);
1463
1464 /*
1465 * vstream->stream_fd may be NULL if it has been closed by
1466 * tracefile rotation, or if we are at the beginning of the
1467 * stream. We open the data stream file here to protect against
1468 * overwrite caused by tracefile rotation (in association with
1469 * unlink performed before overwrite).
1470 */
1471 if (!vstream->stream_file.fd) {
1472 int fd;
1473 char file_path[LTTNG_PATH_MAX];
1474 enum lttng_trace_chunk_status status;
1475
1476 ret = utils_stream_file_path(rstream->path_name,
1477 rstream->channel_name, rstream->tracefile_size,
1478 vstream->current_tracefile_id, NULL, file_path,
1479 sizeof(file_path));
1480 if (ret < 0) {
1481 goto error_put;
1482 }
1483
1484 /*
1485 * It is possible the the file we are trying to open is
1486 * missing if the stream has been closed (application exits with
1487 * per-pid buffers) and a clear command has been performed.
1488 */
1489 status = lttng_trace_chunk_open_file(
1490 vstream->stream_file.trace_chunk,
1491 file_path, O_RDONLY, 0, &fd, true);
1492 if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1493 PERROR("Failed to open trace file for viewer stream");
1494 goto error_put;
1495 }
1496 vstream->stream_file.fd = stream_fd_create(fd);
1497 if (!vstream->stream_file.fd) {
1498 if (close(fd)) {
1499 PERROR("Failed to close viewer stream file");
1500 }
1501 goto error_put;
1502 }
1503 }
1504
1505 ret = check_new_streams(conn);
1506 if (ret < 0) {
1507 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1508 goto send_reply;
1509 } else if (ret == 1) {
1510 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
1511 }
1512
1513 ret = lttng_index_file_read(vstream->index_file, &packet_index);
1514 if (ret) {
1515 ERR("Relay error reading index file %d",
1516 vstream->index_file->fd);
1517 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
1518 goto send_reply;
1519 } else {
1520 viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
1521 vstream->index_sent_seqcount++;
1522 }
1523
1524 /*
1525 * Indexes are stored in big endian, no need to switch before sending.
1526 */
1527 DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64,
1528 rstream->stream_handle,
1529 (uint64_t) be64toh(packet_index.offset));
1530 viewer_index.offset = packet_index.offset;
1531 viewer_index.packet_size = packet_index.packet_size;
1532 viewer_index.content_size = packet_index.content_size;
1533 viewer_index.timestamp_begin = packet_index.timestamp_begin;
1534 viewer_index.timestamp_end = packet_index.timestamp_end;
1535 viewer_index.events_discarded = packet_index.events_discarded;
1536 viewer_index.stream_id = packet_index.stream_id;
1537
1538 send_reply:
1539 if (rstream) {
1540 pthread_mutex_unlock(&rstream->lock);
1541 }
1542
1543 if (metadata_viewer_stream) {
1544 pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
1545 DBG("get next index metadata check: recv %" PRIu64
1546 " sent %" PRIu64,
1547 metadata_viewer_stream->stream->metadata_received,
1548 metadata_viewer_stream->metadata_sent);
1549 if (!metadata_viewer_stream->stream->metadata_received ||
1550 metadata_viewer_stream->stream->metadata_received >
1551 metadata_viewer_stream->metadata_sent) {
1552 viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
1553 }
1554 pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
1555 }
1556
1557 viewer_index.flags = htobe32(viewer_index.flags);
1558 health_code_update();
1559
1560 ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index));
1561 if (ret < 0) {
1562 goto end;
1563 }
1564 health_code_update();
1565
1566 if (vstream) {
1567 DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
1568 vstream->index_sent_seqcount,
1569 vstream->stream->stream_handle);
1570 }
1571 end:
1572 if (metadata_viewer_stream) {
1573 viewer_stream_put(metadata_viewer_stream);
1574 }
1575 if (vstream) {
1576 viewer_stream_put(vstream);
1577 }
1578 return ret;
1579
1580 error_put:
1581 pthread_mutex_unlock(&rstream->lock);
1582 if (metadata_viewer_stream) {
1583 viewer_stream_put(metadata_viewer_stream);
1584 }
1585 viewer_stream_put(vstream);
1586 return ret;
1587 }
1588
1589 /*
1590 * Send the next index for a stream
1591 *
1592 * Return 0 on success or else a negative value.
1593 */
1594 static
1595 int viewer_get_packet(struct relay_connection *conn)
1596 {
1597 int ret;
1598 off_t lseek_ret;
1599 char *reply = NULL;
1600 struct lttng_viewer_get_packet get_packet_info;
1601 struct lttng_viewer_trace_packet reply_header;
1602 struct relay_viewer_stream *vstream = NULL;
1603 uint32_t reply_size = sizeof(reply_header);
1604 uint32_t packet_data_len = 0;
1605 ssize_t read_len;
1606
1607 DBG2("Relay get data packet");
1608
1609 health_code_update();
1610
1611 ret = recv_request(conn->sock, &get_packet_info,
1612 sizeof(get_packet_info));
1613 if (ret < 0) {
1614 goto end;
1615 }
1616 health_code_update();
1617
1618 /* From this point on, the error label can be reached. */
1619 memset(&reply_header, 0, sizeof(reply_header));
1620
1621 vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id));
1622 if (!vstream) {
1623 DBG("Client requested packet of unknown stream id %" PRIu64,
1624 (uint64_t) be64toh(get_packet_info.stream_id));
1625 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1626 goto send_reply_nolock;
1627 } else {
1628 packet_data_len = be32toh(get_packet_info.len);
1629 reply_size += packet_data_len;
1630 }
1631
1632 reply = zmalloc(reply_size);
1633 if (!reply) {
1634 PERROR("packet reply zmalloc");
1635 reply_size = sizeof(reply_header);
1636 goto error;
1637 }
1638
1639 pthread_mutex_lock(&vstream->stream->lock);
1640 lseek_ret = lseek(vstream->stream_file.fd->fd,
1641 be64toh(get_packet_info.offset), SEEK_SET);
1642 if (lseek_ret < 0) {
1643 PERROR("lseek fd %d to offset %" PRIu64,
1644 vstream->stream_file.fd->fd,
1645 (uint64_t) be64toh(get_packet_info.offset));
1646 goto error;
1647 }
1648 read_len = lttng_read(vstream->stream_file.fd->fd,
1649 reply + sizeof(reply_header), packet_data_len);
1650 if (read_len < packet_data_len) {
1651 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
1652 vstream->stream_file.fd->fd,
1653 (uint64_t) be64toh(get_packet_info.offset));
1654 goto error;
1655 }
1656 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK);
1657 reply_header.len = htobe32(packet_data_len);
1658 goto send_reply;
1659
1660 error:
1661 reply_header.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
1662
1663 send_reply:
1664 if (vstream) {
1665 pthread_mutex_unlock(&vstream->stream->lock);
1666 }
1667 send_reply_nolock:
1668
1669 health_code_update();
1670
1671 if (reply) {
1672 memcpy(reply, &reply_header, sizeof(reply_header));
1673 ret = send_response(conn->sock, reply, reply_size);
1674 } else {
1675 /* No reply to send. */
1676 ret = send_response(conn->sock, &reply_header,
1677 reply_size);
1678 }
1679
1680 health_code_update();
1681 if (ret < 0) {
1682 PERROR("sendmsg of packet data failed");
1683 goto end_free;
1684 }
1685
1686 DBG("Sent %u bytes for stream %" PRIu64, reply_size,
1687 (uint64_t) be64toh(get_packet_info.stream_id));
1688
1689 end_free:
1690 free(reply);
1691 end:
1692 if (vstream) {
1693 viewer_stream_put(vstream);
1694 }
1695 return ret;
1696 }
1697
1698 /*
1699 * Send the session's metadata
1700 *
1701 * Return 0 on success else a negative value.
1702 */
1703 static
1704 int viewer_get_metadata(struct relay_connection *conn)
1705 {
1706 int ret = 0;
1707 ssize_t read_len;
1708 uint64_t len = 0;
1709 char *data = NULL;
1710 struct lttng_viewer_get_metadata request;
1711 struct lttng_viewer_metadata_packet reply;
1712 struct relay_viewer_stream *vstream = NULL;
1713
1714 assert(conn);
1715
1716 DBG("Relay get metadata");
1717
1718 health_code_update();
1719
1720 ret = recv_request(conn->sock, &request, sizeof(request));
1721 if (ret < 0) {
1722 goto end;
1723 }
1724 health_code_update();
1725
1726 memset(&reply, 0, sizeof(reply));
1727
1728 vstream = viewer_stream_get_by_id(be64toh(request.stream_id));
1729 if (!vstream) {
1730 /*
1731 * The metadata stream can be closed by a CLOSE command
1732 * just before we attach. It can also be closed by
1733 * per-pid tracing during tracing. Therefore, it is
1734 * possible that we cannot find this viewer stream.
1735 * Reply back to the client with an error if we cannot
1736 * find it.
1737 */
1738 DBG("Client requested metadata of unknown stream id %" PRIu64,
1739 (uint64_t) be64toh(request.stream_id));
1740 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
1741 goto send_reply;
1742 }
1743 pthread_mutex_lock(&vstream->stream->lock);
1744 if (!vstream->stream->is_metadata) {
1745 ERR("Invalid metadata stream");
1746 goto error;
1747 }
1748
1749 assert(vstream->metadata_sent <= vstream->stream->metadata_received);
1750
1751 len = vstream->stream->metadata_received - vstream->metadata_sent;
1752 if (len == 0) {
1753 /*
1754 * The live viewers expect to receive a NO_NEW_METADATA
1755 * status before a stream disappears, otherwise they abort the
1756 * entire live connection when receiving an error status.
1757 */
1758 reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
1759 /*
1760 * The live viewer considers a closed 0 byte metadata stream as
1761 * an error.
1762 */
1763 if (vstream->metadata_sent > 0) {
1764 vstream->stream->no_new_metadata_notified = true;
1765 if (vstream->stream->closed) {
1766 /* Release ownership for the viewer metadata stream. */
1767 viewer_stream_put(vstream);
1768 }
1769 }
1770 goto send_reply;
1771 }
1772
1773 /* first time, we open the metadata file */
1774 if (!vstream->stream_file.fd) {
1775 int fd;
1776 char file_path[LTTNG_PATH_MAX];
1777 enum lttng_trace_chunk_status status;
1778 struct relay_stream *rstream = vstream->stream;
1779
1780 ret = utils_stream_file_path(rstream->path_name,
1781 rstream->channel_name, rstream->tracefile_size,
1782 vstream->current_tracefile_id, NULL, file_path,
1783 sizeof(file_path));
1784 if (ret < 0) {
1785 goto error;
1786 }
1787
1788 /*
1789 * It is possible the the metadata file we are trying to open is
1790 * missing if the stream has been closed (application exits with
1791 * per-pid buffers) and a clear command has been performed.
1792 */
1793 status = lttng_trace_chunk_open_file(
1794 vstream->stream_file.trace_chunk,
1795 file_path, O_RDONLY, 0, &fd, true);
1796 if (status != LTTNG_TRACE_CHUNK_STATUS_OK) {
1797 PERROR("Failed to open metadata file for viewer stream");
1798 goto error;
1799 }
1800 vstream->stream_file.fd = stream_fd_create(fd);
1801 if (!vstream->stream_file.fd) {
1802 if (close(fd)) {
1803 PERROR("Failed to close viewer metadata file");
1804 }
1805 goto error;
1806 }
1807 }
1808
1809 reply.len = htobe64(len);
1810 data = zmalloc(len);
1811 if (!data) {
1812 PERROR("viewer metadata zmalloc");
1813 goto error;
1814 }
1815
1816 read_len = lttng_read(vstream->stream_file.fd->fd, data, len);
1817 if (read_len < len) {
1818 PERROR("Relay reading metadata file");
1819 goto error;
1820 }
1821 vstream->metadata_sent += read_len;
1822 reply.status = htobe32(LTTNG_VIEWER_METADATA_OK);
1823
1824 goto send_reply;
1825
1826 error:
1827 reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
1828
1829 send_reply:
1830 health_code_update();
1831 if (vstream) {
1832 pthread_mutex_unlock(&vstream->stream->lock);
1833 }
1834 ret = send_response(conn->sock, &reply, sizeof(reply));
1835 if (ret < 0) {
1836 goto end_free;
1837 }
1838 health_code_update();
1839
1840 if (len > 0) {
1841 ret = send_response(conn->sock, data, len);
1842 if (ret < 0) {
1843 goto end_free;
1844 }
1845 }
1846
1847 DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
1848 (uint64_t) be64toh(request.stream_id));
1849
1850 DBG("Metadata sent");
1851
1852 end_free:
1853 free(data);
1854 end:
1855 if (vstream) {
1856 viewer_stream_put(vstream);
1857 }
1858 return ret;
1859 }
1860
1861 /*
1862 * Create a viewer session.
1863 *
1864 * Return 0 on success or else a negative value.
1865 */
1866 static
1867 int viewer_create_session(struct relay_connection *conn)
1868 {
1869 int ret;
1870 struct lttng_viewer_create_session_response resp;
1871
1872 DBG("Viewer create session received");
1873
1874 memset(&resp, 0, sizeof(resp));
1875 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK);
1876 conn->viewer_session = viewer_session_create();
1877 if (!conn->viewer_session) {
1878 ERR("Allocation viewer session");
1879 resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR);
1880 goto send_reply;
1881 }
1882
1883 send_reply:
1884 health_code_update();
1885 ret = send_response(conn->sock, &resp, sizeof(resp));
1886 if (ret < 0) {
1887 goto end;
1888 }
1889 health_code_update();
1890 ret = 0;
1891
1892 end:
1893 return ret;
1894 }
1895
1896 /*
1897 * Detach a viewer session.
1898 *
1899 * Return 0 on success or else a negative value.
1900 */
1901 static
1902 int viewer_detach_session(struct relay_connection *conn)
1903 {
1904 int ret;
1905 struct lttng_viewer_detach_session_response response;
1906 struct lttng_viewer_detach_session_request request;
1907 struct relay_session *session = NULL;
1908 uint64_t viewer_session_to_close;
1909
1910 DBG("Viewer detach session received");
1911
1912 assert(conn);
1913
1914 health_code_update();
1915
1916 /* Receive the request from the connected client. */
1917 ret = recv_request(conn->sock, &request, sizeof(request));
1918 if (ret < 0) {
1919 goto end;
1920 }
1921 viewer_session_to_close = be64toh(request.session_id);
1922
1923 if (!conn->viewer_session) {
1924 DBG("Client trying to detach before creating a live viewer session");
1925 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
1926 goto send_reply;
1927 }
1928
1929 health_code_update();
1930
1931 memset(&response, 0, sizeof(response));
1932 DBG("Detaching from session ID %" PRIu64, viewer_session_to_close);
1933
1934 session = session_get_by_id(be64toh(request.session_id));
1935 if (!session) {
1936 DBG("Relay session %" PRIu64 " not found",
1937 (uint64_t) be64toh(request.session_id));
1938 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK);
1939 goto send_reply;
1940 }
1941
1942 ret = viewer_session_is_attached(conn->viewer_session, session);
1943 if (ret != 1) {
1944 DBG("Not attached to this session");
1945 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
1946 goto send_reply_put;
1947 }
1948
1949 viewer_session_close_one_session(conn->viewer_session, session);
1950 response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK);
1951 DBG("Session %" PRIu64 " detached.", viewer_session_to_close);
1952
1953 send_reply_put:
1954 session_put(session);
1955
1956 send_reply:
1957 health_code_update();
1958 ret = send_response(conn->sock, &response, sizeof(response));
1959 if (ret < 0) {
1960 goto end;
1961 }
1962 health_code_update();
1963 ret = 0;
1964
1965 end:
1966 return ret;
1967 }
1968
1969 /*
1970 * live_relay_unknown_command: send -1 if received unknown command
1971 */
1972 static
1973 void live_relay_unknown_command(struct relay_connection *conn)
1974 {
1975 struct lttcomm_relayd_generic_reply reply;
1976
1977 memset(&reply, 0, sizeof(reply));
1978 reply.ret_code = htobe32(LTTNG_ERR_UNK);
1979 (void) send_response(conn->sock, &reply, sizeof(reply));
1980 }
1981
1982 /*
1983 * Process the commands received on the control socket
1984 */
1985 static
1986 int process_control(struct lttng_viewer_cmd *recv_hdr,
1987 struct relay_connection *conn)
1988 {
1989 int ret = 0;
1990 uint32_t msg_value;
1991
1992 msg_value = be32toh(recv_hdr->cmd);
1993
1994 /*
1995 * Make sure we've done the version check before any command other then a
1996 * new client connection.
1997 */
1998 if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) {
1999 ERR("Viewer conn value %" PRIu32 " before version check", msg_value);
2000 ret = -1;
2001 goto end;
2002 }
2003
2004 switch (msg_value) {
2005 case LTTNG_VIEWER_CONNECT:
2006 ret = viewer_connect(conn);
2007 break;
2008 case LTTNG_VIEWER_LIST_SESSIONS:
2009 ret = viewer_list_sessions(conn);
2010 break;
2011 case LTTNG_VIEWER_ATTACH_SESSION:
2012 ret = viewer_attach_session(conn);
2013 break;
2014 case LTTNG_VIEWER_GET_NEXT_INDEX:
2015 ret = viewer_get_next_index(conn);
2016 break;
2017 case LTTNG_VIEWER_GET_PACKET:
2018 ret = viewer_get_packet(conn);
2019 break;
2020 case LTTNG_VIEWER_GET_METADATA:
2021 ret = viewer_get_metadata(conn);
2022 break;
2023 case LTTNG_VIEWER_GET_NEW_STREAMS:
2024 ret = viewer_get_new_streams(conn);
2025 break;
2026 case LTTNG_VIEWER_CREATE_SESSION:
2027 ret = viewer_create_session(conn);
2028 break;
2029 case LTTNG_VIEWER_DETACH_SESSION:
2030 ret = viewer_detach_session(conn);
2031 break;
2032 default:
2033 ERR("Received unknown viewer command (%u)",
2034 be32toh(recv_hdr->cmd));
2035 live_relay_unknown_command(conn);
2036 ret = -1;
2037 goto end;
2038 }
2039
2040 end:
2041 return ret;
2042 }
2043
2044 static
2045 void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
2046 {
2047 int ret;
2048
2049 (void) lttng_poll_del(events, pollfd);
2050
2051 ret = close(pollfd);
2052 if (ret < 0) {
2053 ERR("Closing pollfd %d", pollfd);
2054 }
2055 }
2056
2057 /*
2058 * This thread does the actual work
2059 */
2060 static
2061 void *thread_worker(void *data)
2062 {
2063 int ret, err = -1;
2064 uint32_t nb_fd;
2065 struct lttng_poll_event events;
2066 struct lttng_ht *viewer_connections_ht;
2067 struct lttng_ht_iter iter;
2068 struct lttng_viewer_cmd recv_hdr;
2069 struct relay_connection *destroy_conn;
2070
2071 DBG("[thread] Live viewer relay worker started");
2072
2073 rcu_register_thread();
2074
2075 health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
2076
2077 if (testpoint(relayd_thread_live_worker)) {
2078 goto error_testpoint;
2079 }
2080
2081 /* table of connections indexed on socket */
2082 viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
2083 if (!viewer_connections_ht) {
2084 goto viewer_connections_ht_error;
2085 }
2086
2087 ret = create_thread_poll_set(&events, 2);
2088 if (ret < 0) {
2089 goto error_poll_create;
2090 }
2091
2092 ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
2093 if (ret < 0) {
2094 goto error;
2095 }
2096
2097 restart:
2098 while (1) {
2099 int i;
2100
2101 health_code_update();
2102
2103 /* Infinite blocking call, waiting for transmission */
2104 DBG3("Relayd live viewer worker thread polling...");
2105 health_poll_entry();
2106 ret = lttng_poll_wait(&events, -1);
2107 health_poll_exit();
2108 if (ret < 0) {
2109 /*
2110 * Restart interrupted system call.
2111 */
2112 if (errno == EINTR) {
2113 goto restart;
2114 }
2115 goto error;
2116 }
2117
2118 nb_fd = ret;
2119
2120 /*
2121 * Process control. The control connection is prioritised so we don't
2122 * starve it with high throughput tracing data on the data
2123 * connection.
2124 */
2125 for (i = 0; i < nb_fd; i++) {
2126 /* Fetch once the poll data */
2127 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
2128 int pollfd = LTTNG_POLL_GETFD(&events, i);
2129
2130 health_code_update();
2131
2132 /* Thread quit pipe has been closed. Killing thread. */
2133 ret = check_thread_quit_pipe(pollfd, revents);
2134 if (ret) {
2135 err = 0;
2136 goto exit;
2137 }
2138
2139 /* Inspect the relay conn pipe for new connection. */
2140 if (pollfd == live_conn_pipe[0]) {
2141 if (revents & LPOLLIN) {
2142 struct relay_connection *conn;
2143
2144 ret = lttng_read(live_conn_pipe[0],
2145 &conn, sizeof(conn));
2146 if (ret < 0) {
2147 goto error;
2148 }
2149 ret = lttng_poll_add(&events,
2150 conn->sock->fd,
2151 LPOLLIN | LPOLLRDHUP);
2152 if (ret) {
2153 ERR("Failed to add new live connection file descriptor to poll set");
2154 goto error;
2155 }
2156 connection_ht_add(viewer_connections_ht, conn);
2157 DBG("Connection socket %d added to poll", conn->sock->fd);
2158 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2159 ERR("Relay live pipe error");
2160 goto error;
2161 } else {
2162 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2163 goto error;
2164 }
2165 } else {
2166 /* Connection activity. */
2167 struct relay_connection *conn;
2168
2169 conn = connection_get_by_sock(viewer_connections_ht, pollfd);
2170 if (!conn) {
2171 continue;
2172 }
2173
2174 if (revents & LPOLLIN) {
2175 ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
2176 sizeof(recv_hdr), 0);
2177 if (ret <= 0) {
2178 /* Connection closed. */
2179 cleanup_connection_pollfd(&events, pollfd);
2180 /* Put "create" ownership reference. */
2181 connection_put(conn);
2182 DBG("Viewer control conn closed with %d", pollfd);
2183 } else {
2184 ret = process_control(&recv_hdr, conn);
2185 if (ret < 0) {
2186 /* Clear the session on error. */
2187 cleanup_connection_pollfd(&events, pollfd);
2188 /* Put "create" ownership reference. */
2189 connection_put(conn);
2190 DBG("Viewer connection closed with %d", pollfd);
2191 }
2192 }
2193 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2194 cleanup_connection_pollfd(&events, pollfd);
2195 /* Put "create" ownership reference. */
2196 connection_put(conn);
2197 } else {
2198 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2199 connection_put(conn);
2200 goto error;
2201 }
2202 /* Put local "get_by_sock" reference. */
2203 connection_put(conn);
2204 }
2205 }
2206 }
2207
2208 exit:
2209 error:
2210 lttng_poll_clean(&events);
2211
2212 /* Cleanup remaining connection object. */
2213 rcu_read_lock();
2214 cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter,
2215 destroy_conn,
2216 sock_n.node) {
2217 health_code_update();
2218 connection_put(destroy_conn);
2219 }
2220 rcu_read_unlock();
2221 error_poll_create:
2222 lttng_ht_destroy(viewer_connections_ht);
2223 viewer_connections_ht_error:
2224 /* Close relay conn pipes */
2225 utils_close_pipe(live_conn_pipe);
2226 if (err) {
2227 DBG("Viewer worker thread exited with error");
2228 }
2229 DBG("Viewer worker thread cleanup complete");
2230 error_testpoint:
2231 if (err) {
2232 health_error();
2233 ERR("Health error occurred in %s", __func__);
2234 }
2235 health_unregister(health_relayd);
2236 if (lttng_relay_stop_threads()) {
2237 ERR("Error stopping threads");
2238 }
2239 rcu_unregister_thread();
2240 return NULL;
2241 }
2242
2243 /*
2244 * Create the relay command pipe to wake thread_manage_apps.
2245 * Closed in cleanup().
2246 */
2247 static int create_conn_pipe(void)
2248 {
2249 return utils_create_pipe_cloexec(live_conn_pipe);
2250 }
2251
2252 int relayd_live_join(void)
2253 {
2254 int ret, retval = 0;
2255 void *status;
2256
2257 ret = pthread_join(live_listener_thread, &status);
2258 if (ret) {
2259 errno = ret;
2260 PERROR("pthread_join live listener");
2261 retval = -1;
2262 }
2263
2264 ret = pthread_join(live_worker_thread, &status);
2265 if (ret) {
2266 errno = ret;
2267 PERROR("pthread_join live worker");
2268 retval = -1;
2269 }
2270
2271 ret = pthread_join(live_dispatcher_thread, &status);
2272 if (ret) {
2273 errno = ret;
2274 PERROR("pthread_join live dispatcher");
2275 retval = -1;
2276 }
2277
2278 cleanup_relayd_live();
2279
2280 return retval;
2281 }
2282
2283 /*
2284 * main
2285 */
2286 int relayd_live_create(struct lttng_uri *uri)
2287 {
2288 int ret = 0, retval = 0;
2289 void *status;
2290 int is_root;
2291
2292 if (!uri) {
2293 retval = -1;
2294 goto exit_init_data;
2295 }
2296 live_uri = uri;
2297
2298 /* Check if daemon is UID = 0 */
2299 is_root = !getuid();
2300
2301 if (!is_root) {
2302 if (live_uri->port < 1024) {
2303 ERR("Need to be root to use ports < 1024");
2304 retval = -1;
2305 goto exit_init_data;
2306 }
2307 }
2308
2309 /* Setup the thread apps communication pipe. */
2310 if (create_conn_pipe()) {
2311 retval = -1;
2312 goto exit_init_data;
2313 }
2314
2315 /* Init relay command queue. */
2316 cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail);
2317
2318 /* Set up max poll set size */
2319 if (lttng_poll_set_max_size()) {
2320 retval = -1;
2321 goto exit_init_data;
2322 }
2323
2324 /* Setup the dispatcher thread */
2325 ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(),
2326 thread_dispatcher, (void *) NULL);
2327 if (ret) {
2328 errno = ret;
2329 PERROR("pthread_create viewer dispatcher");
2330 retval = -1;
2331 goto exit_dispatcher_thread;
2332 }
2333
2334 /* Setup the worker thread */
2335 ret = pthread_create(&live_worker_thread, default_pthread_attr(),
2336 thread_worker, NULL);
2337 if (ret) {
2338 errno = ret;
2339 PERROR("pthread_create viewer worker");
2340 retval = -1;
2341 goto exit_worker_thread;
2342 }
2343
2344 /* Setup the listener thread */
2345 ret = pthread_create(&live_listener_thread, default_pthread_attr(),
2346 thread_listener, (void *) NULL);
2347 if (ret) {
2348 errno = ret;
2349 PERROR("pthread_create viewer listener");
2350 retval = -1;
2351 goto exit_listener_thread;
2352 }
2353
2354 /*
2355 * All OK, started all threads.
2356 */
2357 return retval;
2358
2359 /*
2360 * Join on the live_listener_thread should anything be added after
2361 * the live_listener thread's creation.
2362 */
2363
2364 exit_listener_thread:
2365
2366 ret = pthread_join(live_worker_thread, &status);
2367 if (ret) {
2368 errno = ret;
2369 PERROR("pthread_join live worker");
2370 retval = -1;
2371 }
2372 exit_worker_thread:
2373
2374 ret = pthread_join(live_dispatcher_thread, &status);
2375 if (ret) {
2376 errno = ret;
2377 PERROR("pthread_join live dispatcher");
2378 retval = -1;
2379 }
2380 exit_dispatcher_thread:
2381
2382 exit_init_data:
2383 cleanup_relayd_live();
2384
2385 return retval;
2386 }
This page took 0.140076 seconds and 4 git commands to generate.