2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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
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.
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
37 #include <urcu/futex.h>
38 #include <urcu/uatomic.h>
39 #include <urcu/rculist.h>
44 #include <lttng/lttng.h>
45 #include <common/common.h>
46 #include <common/compat/poll.h>
47 #include <common/compat/socket.h>
48 #include <common/compat/endian.h>
49 #include <common/defaults.h>
50 #include <common/futex.h>
51 #include <common/index/index.h>
52 #include <common/sessiond-comm/sessiond-comm.h>
53 #include <common/sessiond-comm/inet.h>
54 #include <common/sessiond-comm/relayd.h>
55 #include <common/uri.h>
56 #include <common/utils.h>
60 #include "lttng-relayd.h"
62 #include "health-relayd.h"
63 #include "testpoint.h"
64 #include "viewer-stream.h"
67 #include "ctf-trace.h"
68 #include "connection.h"
69 #include "viewer-session.h"
71 #define SESSION_BUF_DEFAULT_COUNT 16
73 static struct lttng_uri
*live_uri
;
76 * This pipe is used to inform the worker thread that a command is queued and
77 * ready to be processed.
79 static int live_conn_pipe
[2] = { -1, -1 };
81 /* Shared between threads */
82 static int live_dispatch_thread_exit
;
84 static pthread_t live_listener_thread
;
85 static pthread_t live_dispatcher_thread
;
86 static pthread_t live_worker_thread
;
89 * Relay command queue.
91 * The live_thread_listener and live_thread_dispatcher communicate with this
94 static struct relay_conn_queue viewer_conn_queue
;
96 static uint64_t last_relay_viewer_session_id
;
97 static pthread_mutex_t last_relay_viewer_session_id_lock
=
98 PTHREAD_MUTEX_INITIALIZER
;
104 void cleanup_relayd_live(void)
112 * Receive a request buffer using a given socket, destination allocated buffer
115 * Return the size of the received message or else a negative value on error
116 * with errno being set by recvmsg() syscall.
119 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
123 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
124 if (ret
< 0 || ret
!= size
) {
126 /* Orderly shutdown. Not necessary to print an error. */
127 DBG("Socket %d did an orderly shutdown", sock
->fd
);
129 ERR("Relay failed to receive request.");
138 * Send a response buffer using a given socket, source allocated buffer of
141 * Return the size of the sent message or else a negative value on error with
142 * errno being set by sendmsg() syscall.
145 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
149 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
151 ERR("Relayd failed to send response.");
158 * Atomically check if new streams got added in one of the sessions attached
159 * and reset the flag to 0.
161 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
165 int check_new_streams(struct relay_connection
*conn
)
167 struct relay_session
*session
;
168 unsigned long current_val
;
171 if (!conn
->viewer_session
) {
175 cds_list_for_each_entry_rcu(session
,
176 &conn
->viewer_session
->session_list
,
177 viewer_session_node
) {
178 if (!session_get(session
)) {
181 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
183 session_put(session
);
194 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
195 * this function should ignore the sent flag or not.
197 * Return 0 on success or else a negative value.
200 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
201 struct relay_session
*session
, unsigned int ignore_sent_flag
)
204 struct lttng_viewer_stream send_stream
;
205 struct lttng_ht_iter iter
;
206 struct relay_viewer_stream
*vstream
;
210 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
212 struct ctf_trace
*ctf_trace
;
214 health_code_update();
216 if (!viewer_stream_get(vstream
)) {
220 pthread_mutex_lock(&vstream
->stream
->lock
);
221 /* Ignore if not the same session. */
222 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
223 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
224 pthread_mutex_unlock(&vstream
->stream
->lock
);
225 viewer_stream_put(vstream
);
229 ctf_trace
= vstream
->stream
->trace
;
230 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
231 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
232 send_stream
.metadata_flag
= htobe32(
233 vstream
->stream
->is_metadata
);
234 if (lttng_strncpy(send_stream
.path_name
, vstream
->path_name
,
235 sizeof(send_stream
.path_name
))) {
236 pthread_mutex_unlock(&vstream
->stream
->lock
);
237 viewer_stream_put(vstream
);
238 ret
= -1; /* Error. */
241 if (lttng_strncpy(send_stream
.channel_name
,
242 vstream
->channel_name
,
243 sizeof(send_stream
.channel_name
))) {
244 pthread_mutex_unlock(&vstream
->stream
->lock
);
245 viewer_stream_put(vstream
);
246 ret
= -1; /* Error. */
250 DBG("Sending stream %" PRIu64
" to viewer",
251 vstream
->stream
->stream_handle
);
252 vstream
->sent_flag
= 1;
253 pthread_mutex_unlock(&vstream
->stream
->lock
);
255 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
256 viewer_stream_put(vstream
);
270 * Create every viewer stream possible for the given session with the seek
271 * type. Three counters *can* be return which are in order the total amount of
272 * viewer stream of the session, the number of unsent stream and the number of
273 * stream created. Those counters can be NULL and thus will be ignored.
275 * Return 0 on success or else a negative value.
278 int make_viewer_streams(struct relay_session
*session
,
279 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
280 uint32_t *nb_created
, bool *closed
)
283 struct lttng_ht_iter iter
;
284 struct ctf_trace
*ctf_trace
;
289 * Hold the session lock to ensure that we see either none or
290 * all initial streams for a session, but no intermediate state.
292 pthread_mutex_lock(&session
->lock
);
294 if (session
->connection_closed
) {
299 * Create viewer streams for relay streams that are ready to be
300 * used for a the given session id only.
303 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
305 struct relay_stream
*stream
;
307 health_code_update();
309 if (!ctf_trace_get(ctf_trace
)) {
313 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
314 struct relay_viewer_stream
*vstream
;
316 if (!stream_get(stream
)) {
320 * stream published is protected by the session lock.
322 if (!stream
->published
) {
325 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
327 vstream
= viewer_stream_create(stream
, seek_t
);
330 ctf_trace_put(ctf_trace
);
336 /* Update number of created stream counter. */
340 * Ensure a self-reference is preserved even
341 * after we have put our local reference.
343 viewer_stream_get(vstream
);
345 if (!vstream
->sent_flag
&& nb_unsent
) {
346 /* Update number of unsent stream counter. */
350 /* Update number of total stream counter. */
352 if (stream
->is_metadata
) {
353 if (!stream
->closed
||
354 stream
->metadata_received
> vstream
->metadata_sent
) {
358 if (!stream
->closed
||
359 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
365 /* Put local reference. */
366 viewer_stream_put(vstream
);
370 ctf_trace_put(ctf_trace
);
377 pthread_mutex_unlock(&session
->lock
);
381 int relayd_live_stop(void)
383 /* Stop dispatch thread */
384 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
385 futex_nto1_wake(&viewer_conn_queue
.futex
);
390 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
393 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
397 if (events
== NULL
|| size
== 0) {
402 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
408 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
420 * Check if the thread quit pipe was triggered.
422 * Return 1 if it was triggered else 0;
425 int check_thread_quit_pipe(int fd
, uint32_t events
)
427 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
435 * Create and init socket from uri.
438 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
441 struct lttcomm_sock
*sock
= NULL
;
443 sock
= lttcomm_alloc_sock_from_uri(uri
);
445 ERR("Allocating socket");
449 ret
= lttcomm_create_sock(sock
);
453 DBG("Listening on sock %d for live", sock
->fd
);
455 ret
= sock
->ops
->bind(sock
);
460 ret
= sock
->ops
->listen(sock
, -1);
470 lttcomm_destroy_sock(sock
);
476 * This thread manages the listening for new connections on the network
479 void *thread_listener(void *data
)
481 int i
, ret
, pollfd
, err
= -1;
482 uint32_t revents
, nb_fd
;
483 struct lttng_poll_event events
;
484 struct lttcomm_sock
*live_control_sock
;
486 DBG("[thread] Relay live listener started");
488 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
490 health_code_update();
492 live_control_sock
= init_socket(live_uri
);
493 if (!live_control_sock
) {
494 goto error_sock_control
;
497 /* Pass 2 as size here for the thread quit pipe and control sockets. */
498 ret
= create_thread_poll_set(&events
, 2);
500 goto error_create_poll
;
503 /* Add the control socket */
504 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
509 lttng_relay_notify_ready();
511 if (testpoint(relayd_thread_live_listener
)) {
512 goto error_testpoint
;
516 health_code_update();
518 DBG("Listener accepting live viewers connections");
522 ret
= lttng_poll_wait(&events
, -1);
526 * Restart interrupted system call.
528 if (errno
== EINTR
) {
535 DBG("Relay new viewer connection received");
536 for (i
= 0; i
< nb_fd
; i
++) {
537 health_code_update();
539 /* Fetch once the poll data */
540 revents
= LTTNG_POLL_GETEV(&events
, i
);
541 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
544 /* No activity for this FD (poll implementation). */
548 /* Thread quit pipe has been closed. Killing thread. */
549 ret
= check_thread_quit_pipe(pollfd
, revents
);
555 if (revents
& LPOLLIN
) {
557 * A new connection is requested, therefore a
558 * viewer connection is allocated in this
559 * thread, enqueued to a global queue and
560 * dequeued (and freed) in the worker thread.
563 struct relay_connection
*new_conn
;
564 struct lttcomm_sock
*newsock
;
566 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
568 PERROR("accepting control sock");
571 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
573 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
576 PERROR("setsockopt inet");
577 lttcomm_destroy_sock(newsock
);
580 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
582 lttcomm_destroy_sock(newsock
);
585 /* Ownership assumed by the connection. */
588 /* Enqueue request for the dispatcher thread. */
589 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
593 * Wake the dispatch queue futex.
594 * Implicit memory barrier with the
595 * exchange in cds_wfcq_enqueue.
597 futex_nto1_wake(&viewer_conn_queue
.futex
);
598 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
599 ERR("socket poll error");
602 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
612 lttng_poll_clean(&events
);
614 if (live_control_sock
->fd
>= 0) {
615 ret
= live_control_sock
->ops
->close(live_control_sock
);
620 lttcomm_destroy_sock(live_control_sock
);
624 DBG("Live viewer listener thread exited with error");
626 health_unregister(health_relayd
);
627 DBG("Live viewer listener thread cleanup complete");
628 if (lttng_relay_stop_threads()) {
629 ERR("Error stopping threads");
635 * This thread manages the dispatching of the requests to worker threads
638 void *thread_dispatcher(void *data
)
642 struct cds_wfcq_node
*node
;
643 struct relay_connection
*conn
= NULL
;
645 DBG("[thread] Live viewer relay dispatcher started");
647 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
649 if (testpoint(relayd_thread_live_dispatcher
)) {
650 goto error_testpoint
;
653 health_code_update();
655 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
656 health_code_update();
658 /* Atomically prepare the queue futex */
659 futex_nto1_prepare(&viewer_conn_queue
.futex
);
662 health_code_update();
664 /* Dequeue commands */
665 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
666 &viewer_conn_queue
.tail
);
668 DBG("Woken up but nothing in the live-viewer "
669 "relay command queue");
670 /* Continue thread execution */
673 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
674 DBG("Dispatching viewer request waiting on sock %d",
678 * Inform worker thread of the new request. This
679 * call is blocking so we can be assured that
680 * the data will be read at some point in time
681 * or wait to the end of the world :)
683 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
685 PERROR("write conn pipe");
686 connection_put(conn
);
689 } while (node
!= NULL
);
691 /* Futex wait on queue. Blocking call on futex() */
693 futex_nto1_wait(&viewer_conn_queue
.futex
);
697 /* Normal exit, no error */
704 ERR("Health error occurred in %s", __func__
);
706 health_unregister(health_relayd
);
707 DBG("Live viewer dispatch thread dying");
708 if (lttng_relay_stop_threads()) {
709 ERR("Error stopping threads");
715 * Establish connection with the viewer and check the versions.
717 * Return 0 on success or else negative value.
720 int viewer_connect(struct relay_connection
*conn
)
723 struct lttng_viewer_connect reply
, msg
;
725 conn
->version_check_done
= 1;
727 health_code_update();
729 DBG("Viewer is establishing a connection to the relayd.");
731 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
736 health_code_update();
738 memset(&reply
, 0, sizeof(reply
));
739 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
740 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
742 /* Major versions must be the same */
743 if (reply
.major
!= be32toh(msg
.major
)) {
744 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
745 reply
.major
, be32toh(msg
.major
));
750 conn
->major
= reply
.major
;
751 /* We adapt to the lowest compatible version */
752 if (reply
.minor
<= be32toh(msg
.minor
)) {
753 conn
->minor
= reply
.minor
;
755 conn
->minor
= be32toh(msg
.minor
);
758 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
759 conn
->type
= RELAY_VIEWER_COMMAND
;
760 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
761 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
763 ERR("Unknown connection type : %u", be32toh(msg
.type
));
768 reply
.major
= htobe32(reply
.major
);
769 reply
.minor
= htobe32(reply
.minor
);
770 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
772 * Increment outside of htobe64 macro, because the argument can
773 * be used more than once within the macro, and thus the
774 * operation may be undefined.
776 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
777 last_relay_viewer_session_id
++;
778 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
779 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
782 health_code_update();
784 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
789 health_code_update();
791 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
799 * Send the viewer the list of current sessions.
800 * We need to create a copy of the hash table content because otherwise
801 * we cannot assume the number of entries stays the same between getting
802 * the number of HT elements and iteration over the HT.
804 * Return 0 on success or else a negative value.
807 int viewer_list_sessions(struct relay_connection
*conn
)
810 struct lttng_viewer_list_sessions session_list
;
811 struct lttng_ht_iter iter
;
812 struct relay_session
*session
;
813 struct lttng_viewer_session
*send_session_buf
= NULL
;
814 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
817 DBG("List sessions received");
819 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
820 if (!send_session_buf
) {
825 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
827 struct lttng_viewer_session
*send_session
;
829 health_code_update();
831 if (count
>= buf_count
) {
832 struct lttng_viewer_session
*newbuf
;
833 uint32_t new_buf_count
= buf_count
<< 1;
835 newbuf
= realloc(send_session_buf
,
836 new_buf_count
* sizeof(*send_session_buf
));
842 send_session_buf
= newbuf
;
843 buf_count
= new_buf_count
;
845 send_session
= &send_session_buf
[count
];
846 if (lttng_strncpy(send_session
->session_name
,
847 session
->session_name
,
848 sizeof(send_session
->session_name
))) {
853 if (lttng_strncpy(send_session
->hostname
, session
->hostname
,
854 sizeof(send_session
->hostname
))) {
859 send_session
->id
= htobe64(session
->id
);
860 send_session
->live_timer
= htobe32(session
->live_timer
);
861 if (session
->viewer_attached
) {
862 send_session
->clients
= htobe32(1);
864 send_session
->clients
= htobe32(0);
866 send_session
->streams
= htobe32(session
->stream_count
);
871 session_list
.sessions_count
= htobe32(count
);
873 health_code_update();
875 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
880 health_code_update();
882 ret
= send_response(conn
->sock
, send_session_buf
,
883 count
* sizeof(*send_session_buf
));
887 health_code_update();
891 free(send_session_buf
);
896 * Send the viewer the list of current streams.
899 int viewer_get_new_streams(struct relay_connection
*conn
)
901 int ret
, send_streams
= 0;
902 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
903 struct lttng_viewer_new_streams_request request
;
904 struct lttng_viewer_new_streams_response response
;
905 struct relay_session
*session
;
911 DBG("Get new streams received");
913 health_code_update();
915 /* Receive the request from the connected client. */
916 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
920 session_id
= be64toh(request
.session_id
);
922 health_code_update();
924 memset(&response
, 0, sizeof(response
));
926 session
= session_get_by_id(session_id
);
928 DBG("Relay session %" PRIu64
" not found", session_id
);
929 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
933 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
935 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
940 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
942 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
943 &nb_created
, &closed
);
945 goto end_put_session
;
947 /* Only send back the newly created streams with the unsent ones. */
948 nb_streams
= nb_created
+ nb_unsent
;
949 response
.streams_count
= htobe32(nb_streams
);
952 * If the session is closed, HUP when there are no more streams
955 if (closed
&& nb_total
== 0) {
957 response
.streams_count
= 0;
958 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
963 health_code_update();
964 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
966 goto end_put_session
;
968 health_code_update();
971 * Unknown or empty session, just return gracefully, the viewer
972 * knows what is happening.
974 if (!send_streams
|| !nb_streams
) {
976 goto end_put_session
;
980 * Send stream and *DON'T* ignore the sent flag so every viewer
981 * streams that were not sent from that point will be sent to
984 ret
= send_viewer_streams(conn
->sock
, session
, 0);
986 goto end_put_session
;
991 session_put(session
);
998 * Send the viewer the list of current sessions.
1001 int viewer_attach_session(struct relay_connection
*conn
)
1003 int send_streams
= 0;
1005 uint32_t nb_streams
= 0;
1006 enum lttng_viewer_seek seek_type
;
1007 struct lttng_viewer_attach_session_request request
;
1008 struct lttng_viewer_attach_session_response response
;
1009 struct relay_session
*session
= NULL
;
1010 bool closed
= false;
1014 health_code_update();
1016 /* Receive the request from the connected client. */
1017 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1022 health_code_update();
1024 memset(&response
, 0, sizeof(response
));
1026 if (!conn
->viewer_session
) {
1027 DBG("Client trying to attach before creating a live viewer session");
1028 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1032 session
= session_get_by_id(be64toh(request
.session_id
));
1034 DBG("Relay session %" PRIu64
" not found",
1035 be64toh(request
.session_id
));
1036 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1039 DBG("Attach session ID %" PRIu64
" received",
1040 be64toh(request
.session_id
));
1042 if (session
->live_timer
== 0) {
1043 DBG("Not live session");
1044 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1049 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1051 DBG("Already a viewer attached");
1052 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1056 switch (be32toh(request
.seek
)) {
1057 case LTTNG_VIEWER_SEEK_BEGINNING
:
1058 case LTTNG_VIEWER_SEEK_LAST
:
1059 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1060 seek_type
= be32toh(request
.seek
);
1063 ERR("Wrong seek parameter");
1064 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1069 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1072 goto end_put_session
;
1074 response
.streams_count
= htobe32(nb_streams
);
1077 * If the session is closed when the viewer is attaching, it
1078 * means some of the streams may have been concurrently removed,
1079 * so we don't allow the viewer to attach, even if there are
1080 * streams available.
1084 response
.streams_count
= 0;
1085 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1090 health_code_update();
1091 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1093 goto end_put_session
;
1095 health_code_update();
1098 * Unknown or empty session, just return gracefully, the viewer
1099 * knows what is happening.
1101 if (!send_streams
|| !nb_streams
) {
1103 goto end_put_session
;
1106 /* Send stream and ignore the sent flag. */
1107 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1109 goto end_put_session
;
1114 session_put(session
);
1121 * Open the index file if needed for the given vstream.
1123 * If an index file is successfully opened, the vstream index_fd set with
1126 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1128 * Called with rstream lock held.
1130 static int try_open_index(struct relay_viewer_stream
*vstream
,
1131 struct relay_stream
*rstream
)
1135 if (vstream
->index_fd
) {
1140 * First time, we open the index file and at least one index is ready.
1142 if (rstream
->index_received_seqcount
== 0) {
1146 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1147 vstream
->stream
->tracefile_count
,
1148 vstream
->current_tracefile_id
);
1150 vstream
->index_fd
= stream_fd_create(ret
);
1151 if (!vstream
->index_fd
) {
1167 * Check the status of the index for the given stream. This function
1168 * updates the index structure if needed and can put (close) the vstream
1169 * in the HUP situation.
1171 * Return 0 means that we can proceed with the index. A value of 1 means
1172 * that the index has been updated and is ready to be sent to the
1173 * client. A negative value indicates an error that can't be handled.
1175 * Called with rstream lock held.
1177 static int check_index_status(struct relay_viewer_stream
*vstream
,
1178 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1179 struct lttng_viewer_index
*index
)
1183 if (trace
->session
->connection_closed
1184 && rstream
->index_received_seqcount
1185 == vstream
->index_sent_seqcount
) {
1186 /* Last index sent and session connection is closed. */
1187 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1189 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1190 rstream
->index_received_seqcount
1191 == vstream
->index_sent_seqcount
) {
1193 * We've received a synchronization beacon and the last index
1194 * available has been sent, the index for now is inactive.
1196 * In this case, we have received a beacon which allows us to
1197 * inform the client of a time interval during which we can
1198 * guarantee that there are no events to read (and never will
1201 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1202 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1203 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1205 } else if (rstream
->index_received_seqcount
1206 == vstream
->index_sent_seqcount
) {
1208 * This checks whether received == sent seqcount. In
1209 * this case, we have not received a beacon. Therefore,
1210 * we can only ask the client to retry later.
1212 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1214 } else if (!tracefile_array_seq_in_file(rstream
->tfa
,
1215 vstream
->current_tracefile_id
,
1216 vstream
->index_sent_seqcount
)) {
1218 * The next index we want to send cannot be read either
1219 * because we need to perform a rotation, or due to
1220 * the producer having overwritten its trace file.
1222 DBG("Viewer stream %" PRIu64
" rotation",
1223 vstream
->stream
->stream_handle
);
1224 ret
= viewer_stream_rotate(vstream
);
1227 } else if (ret
== 1) {
1228 /* EOF across entire stream. */
1229 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1233 * If we have been pushed due to overwrite, it
1234 * necessarily means there is data that can be read in
1235 * the stream. If we rotated because we reached the end
1236 * of a tracefile, it means the following tracefile
1237 * needs to contain at least one index, else we would
1238 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1239 * viewer. The updated index_sent_seqcount needs to
1240 * point to a readable index entry now.
1242 * In the case where we "rotate" on a single file, we
1243 * can end up in a case where the requested index is
1244 * still unavailable.
1246 if (rstream
->tracefile_count
== 1 &&
1247 !tracefile_array_seq_in_file(
1249 vstream
->current_tracefile_id
,
1250 vstream
->index_sent_seqcount
)) {
1251 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1254 assert(tracefile_array_seq_in_file(rstream
->tfa
,
1255 vstream
->current_tracefile_id
,
1256 vstream
->index_sent_seqcount
));
1258 /* ret == 0 means successful so we continue. */
1264 viewer_stream_put(vstream
);
1270 * Send the next index for a stream.
1272 * Return 0 on success or else a negative value.
1275 int viewer_get_next_index(struct relay_connection
*conn
)
1279 struct lttng_viewer_get_next_index request_index
;
1280 struct lttng_viewer_index viewer_index
;
1281 struct ctf_packet_index packet_index
;
1282 struct relay_viewer_stream
*vstream
= NULL
;
1283 struct relay_stream
*rstream
= NULL
;
1284 struct ctf_trace
*ctf_trace
= NULL
;
1285 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1289 DBG("Viewer get next index");
1291 memset(&viewer_index
, 0, sizeof(viewer_index
));
1292 health_code_update();
1294 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1298 health_code_update();
1300 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1302 DBG("Client requested index of unknown stream id %" PRIu64
,
1303 be64toh(request_index
.stream_id
));
1304 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1308 /* Use back. ref. Protected by refcounts. */
1309 rstream
= vstream
->stream
;
1310 ctf_trace
= rstream
->trace
;
1312 /* metadata_viewer_stream may be NULL. */
1313 metadata_viewer_stream
=
1314 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1316 pthread_mutex_lock(&rstream
->lock
);
1319 * The viewer should not ask for index on metadata stream.
1321 if (rstream
->is_metadata
) {
1322 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1326 /* Try to open an index if one is needed for that stream. */
1327 ret
= try_open_index(vstream
, rstream
);
1329 if (ret
== -ENOENT
) {
1331 * The index is created only when the first data
1332 * packet arrives, it might not be ready at the
1333 * beginning of the session
1335 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1337 /* Unhandled error. */
1338 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1343 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1346 } else if (ret
== 1) {
1348 * We have no index to send and check_index_status has populated
1349 * viewer_index's status.
1353 /* At this point, ret is 0 thus we will be able to read the index. */
1357 * vstream->stream_fd may be NULL if it has been closed by
1358 * tracefile rotation, or if we are at the beginning of the
1359 * stream. We open the data stream file here to protect against
1360 * overwrite caused by tracefile rotation (in association with
1361 * unlink performed before overwrite).
1363 if (!vstream
->stream_fd
) {
1364 char fullpath
[PATH_MAX
];
1366 if (vstream
->stream
->tracefile_count
> 0) {
1367 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1369 vstream
->channel_name
,
1370 vstream
->current_tracefile_id
);
1372 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1374 vstream
->channel_name
);
1379 ret
= open(fullpath
, O_RDONLY
);
1381 PERROR("Relay opening trace file");
1384 vstream
->stream_fd
= stream_fd_create(ret
);
1385 if (!vstream
->stream_fd
) {
1393 ret
= check_new_streams(conn
);
1395 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1397 } else if (ret
== 1) {
1398 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1401 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1402 sizeof(packet_index
));
1403 if (read_ret
< sizeof(packet_index
)) {
1404 ERR("Relay reading index file %d returned %zd",
1405 vstream
->index_fd
->fd
, read_ret
);
1406 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1409 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1410 vstream
->index_sent_seqcount
++;
1414 * Indexes are stored in big endian, no need to switch before sending.
1416 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1417 rstream
->stream_handle
,
1418 be64toh(packet_index
.offset
));
1419 viewer_index
.offset
= packet_index
.offset
;
1420 viewer_index
.packet_size
= packet_index
.packet_size
;
1421 viewer_index
.content_size
= packet_index
.content_size
;
1422 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1423 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1424 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1425 viewer_index
.stream_id
= packet_index
.stream_id
;
1429 pthread_mutex_unlock(&rstream
->lock
);
1432 if (metadata_viewer_stream
) {
1433 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1434 DBG("get next index metadata check: recv %" PRIu64
1436 metadata_viewer_stream
->stream
->metadata_received
,
1437 metadata_viewer_stream
->metadata_sent
);
1438 if (!metadata_viewer_stream
->stream
->metadata_received
||
1439 metadata_viewer_stream
->stream
->metadata_received
>
1440 metadata_viewer_stream
->metadata_sent
) {
1441 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1443 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1446 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1447 health_code_update();
1449 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1453 health_code_update();
1456 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1457 vstream
->index_sent_seqcount
,
1458 vstream
->stream
->stream_handle
);
1461 if (metadata_viewer_stream
) {
1462 viewer_stream_put(metadata_viewer_stream
);
1465 viewer_stream_put(vstream
);
1470 pthread_mutex_unlock(&rstream
->lock
);
1471 if (metadata_viewer_stream
) {
1472 viewer_stream_put(metadata_viewer_stream
);
1474 viewer_stream_put(vstream
);
1479 * Send the next index for a stream
1481 * Return 0 on success or else a negative value.
1484 int viewer_get_packet(struct relay_connection
*conn
)
1486 int ret
, send_data
= 0;
1490 struct lttng_viewer_get_packet get_packet_info
;
1491 struct lttng_viewer_trace_packet reply
;
1492 struct relay_viewer_stream
*vstream
= NULL
;
1494 DBG2("Relay get data packet");
1496 health_code_update();
1498 ret
= recv_request(conn
->sock
, &get_packet_info
,
1499 sizeof(get_packet_info
));
1503 health_code_update();
1505 /* From this point on, the error label can be reached. */
1506 memset(&reply
, 0, sizeof(reply
));
1508 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1510 DBG("Client requested packet of unknown stream id %" PRIu64
,
1511 be64toh(get_packet_info
.stream_id
));
1512 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1513 goto send_reply_nolock
;
1516 pthread_mutex_lock(&vstream
->stream
->lock
);
1518 len
= be32toh(get_packet_info
.len
);
1519 data
= zmalloc(len
);
1521 PERROR("relay data zmalloc");
1525 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1528 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1529 be64toh(get_packet_info
.offset
));
1532 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1533 if (read_len
< len
) {
1534 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1535 vstream
->stream_fd
->fd
,
1536 be64toh(get_packet_info
.offset
));
1539 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1540 reply
.len
= htobe32(len
);
1545 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1549 pthread_mutex_unlock(&vstream
->stream
->lock
);
1552 reply
.flags
= htobe32(reply
.flags
);
1554 health_code_update();
1556 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1560 health_code_update();
1563 health_code_update();
1564 ret
= send_response(conn
->sock
, data
, len
);
1568 health_code_update();
1571 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1572 be64toh(get_packet_info
.stream_id
));
1578 viewer_stream_put(vstream
);
1584 * Send the session's metadata
1586 * Return 0 on success else a negative value.
1589 int viewer_get_metadata(struct relay_connection
*conn
)
1595 struct lttng_viewer_get_metadata request
;
1596 struct lttng_viewer_metadata_packet reply
;
1597 struct relay_viewer_stream
*vstream
= NULL
;
1601 DBG("Relay get metadata");
1603 health_code_update();
1605 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1609 health_code_update();
1611 memset(&reply
, 0, sizeof(reply
));
1613 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1616 * The metadata stream can be closed by a CLOSE command
1617 * just before we attach. It can also be closed by
1618 * per-pid tracing during tracing. Therefore, it is
1619 * possible that we cannot find this viewer stream.
1620 * Reply back to the client with an error if we cannot
1623 DBG("Client requested metadata of unknown stream id %" PRIu64
,
1624 be64toh(request
.stream_id
));
1625 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1628 pthread_mutex_lock(&vstream
->stream
->lock
);
1629 if (!vstream
->stream
->is_metadata
) {
1630 ERR("Invalid metadata stream");
1634 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1636 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1638 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1642 /* first time, we open the metadata file */
1643 if (!vstream
->stream_fd
) {
1644 char fullpath
[PATH_MAX
];
1646 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1647 vstream
->channel_name
);
1651 ret
= open(fullpath
, O_RDONLY
);
1653 PERROR("Relay opening metadata file");
1656 vstream
->stream_fd
= stream_fd_create(ret
);
1657 if (!vstream
->stream_fd
) {
1665 reply
.len
= htobe64(len
);
1666 data
= zmalloc(len
);
1668 PERROR("viewer metadata zmalloc");
1672 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1673 if (read_len
< len
) {
1674 PERROR("Relay reading metadata file");
1677 vstream
->metadata_sent
+= read_len
;
1678 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1679 && vstream
->stream
->closed
) {
1680 /* Release ownership for the viewer metadata stream. */
1681 viewer_stream_put(vstream
);
1684 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1689 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1692 health_code_update();
1694 pthread_mutex_unlock(&vstream
->stream
->lock
);
1696 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1700 health_code_update();
1703 ret
= send_response(conn
->sock
, data
, len
);
1709 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1710 be64toh(request
.stream_id
));
1712 DBG("Metadata sent");
1718 viewer_stream_put(vstream
);
1724 * Create a viewer session.
1726 * Return 0 on success or else a negative value.
1729 int viewer_create_session(struct relay_connection
*conn
)
1732 struct lttng_viewer_create_session_response resp
;
1734 DBG("Viewer create session received");
1736 memset(&resp
, 0, sizeof(resp
));
1737 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1738 conn
->viewer_session
= viewer_session_create();
1739 if (!conn
->viewer_session
) {
1740 ERR("Allocation viewer session");
1741 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1746 health_code_update();
1747 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1751 health_code_update();
1760 * live_relay_unknown_command: send -1 if received unknown command
1763 void live_relay_unknown_command(struct relay_connection
*conn
)
1765 struct lttcomm_relayd_generic_reply reply
;
1767 memset(&reply
, 0, sizeof(reply
));
1768 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1769 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1773 * Process the commands received on the control socket
1776 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1777 struct relay_connection
*conn
)
1782 msg_value
= be32toh(recv_hdr
->cmd
);
1785 * Make sure we've done the version check before any command other then a
1786 * new client connection.
1788 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1789 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1794 switch (msg_value
) {
1795 case LTTNG_VIEWER_CONNECT
:
1796 ret
= viewer_connect(conn
);
1798 case LTTNG_VIEWER_LIST_SESSIONS
:
1799 ret
= viewer_list_sessions(conn
);
1801 case LTTNG_VIEWER_ATTACH_SESSION
:
1802 ret
= viewer_attach_session(conn
);
1804 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1805 ret
= viewer_get_next_index(conn
);
1807 case LTTNG_VIEWER_GET_PACKET
:
1808 ret
= viewer_get_packet(conn
);
1810 case LTTNG_VIEWER_GET_METADATA
:
1811 ret
= viewer_get_metadata(conn
);
1813 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1814 ret
= viewer_get_new_streams(conn
);
1816 case LTTNG_VIEWER_CREATE_SESSION
:
1817 ret
= viewer_create_session(conn
);
1820 ERR("Received unknown viewer command (%u)",
1821 be32toh(recv_hdr
->cmd
));
1822 live_relay_unknown_command(conn
);
1832 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1836 (void) lttng_poll_del(events
, pollfd
);
1838 ret
= close(pollfd
);
1840 ERR("Closing pollfd %d", pollfd
);
1845 * This thread does the actual work
1848 void *thread_worker(void *data
)
1852 struct lttng_poll_event events
;
1853 struct lttng_ht
*viewer_connections_ht
;
1854 struct lttng_ht_iter iter
;
1855 struct lttng_viewer_cmd recv_hdr
;
1856 struct relay_connection
*destroy_conn
;
1858 DBG("[thread] Live viewer relay worker started");
1860 rcu_register_thread();
1862 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1864 if (testpoint(relayd_thread_live_worker
)) {
1865 goto error_testpoint
;
1868 /* table of connections indexed on socket */
1869 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1870 if (!viewer_connections_ht
) {
1871 goto viewer_connections_ht_error
;
1874 ret
= create_thread_poll_set(&events
, 2);
1876 goto error_poll_create
;
1879 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1888 health_code_update();
1890 /* Infinite blocking call, waiting for transmission */
1891 DBG3("Relayd live viewer worker thread polling...");
1892 health_poll_entry();
1893 ret
= lttng_poll_wait(&events
, -1);
1897 * Restart interrupted system call.
1899 if (errno
== EINTR
) {
1908 * Process control. The control connection is prioritised so we don't
1909 * starve it with high throughput tracing data on the data
1912 for (i
= 0; i
< nb_fd
; i
++) {
1913 /* Fetch once the poll data */
1914 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1915 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1917 health_code_update();
1920 /* No activity for this FD (poll implementation). */
1924 /* Thread quit pipe has been closed. Killing thread. */
1925 ret
= check_thread_quit_pipe(pollfd
, revents
);
1931 /* Inspect the relay conn pipe for new connection. */
1932 if (pollfd
== live_conn_pipe
[0]) {
1933 if (revents
& LPOLLIN
) {
1934 struct relay_connection
*conn
;
1936 ret
= lttng_read(live_conn_pipe
[0],
1937 &conn
, sizeof(conn
));
1941 lttng_poll_add(&events
, conn
->sock
->fd
,
1942 LPOLLIN
| LPOLLRDHUP
);
1943 connection_ht_add(viewer_connections_ht
, conn
);
1944 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1945 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1946 ERR("Relay live pipe error");
1949 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1953 /* Connection activity. */
1954 struct relay_connection
*conn
;
1956 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1961 if (revents
& LPOLLIN
) {
1962 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1963 sizeof(recv_hdr
), 0);
1965 /* Connection closed. */
1966 cleanup_connection_pollfd(&events
, pollfd
);
1967 /* Put "create" ownership reference. */
1968 connection_put(conn
);
1969 DBG("Viewer control conn closed with %d", pollfd
);
1971 ret
= process_control(&recv_hdr
, conn
);
1973 /* Clear the session on error. */
1974 cleanup_connection_pollfd(&events
, pollfd
);
1975 /* Put "create" ownership reference. */
1976 connection_put(conn
);
1977 DBG("Viewer connection closed with %d", pollfd
);
1980 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1981 cleanup_connection_pollfd(&events
, pollfd
);
1982 /* Put "create" ownership reference. */
1983 connection_put(conn
);
1985 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1986 connection_put(conn
);
1989 /* Put local "get_by_sock" reference. */
1990 connection_put(conn
);
1997 lttng_poll_clean(&events
);
1999 /* Cleanup reamaining connection object. */
2001 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
2004 health_code_update();
2005 connection_put(destroy_conn
);
2009 lttng_ht_destroy(viewer_connections_ht
);
2010 viewer_connections_ht_error
:
2011 /* Close relay conn pipes */
2012 utils_close_pipe(live_conn_pipe
);
2014 DBG("Viewer worker thread exited with error");
2016 DBG("Viewer worker thread cleanup complete");
2020 ERR("Health error occurred in %s", __func__
);
2022 health_unregister(health_relayd
);
2023 if (lttng_relay_stop_threads()) {
2024 ERR("Error stopping threads");
2026 rcu_unregister_thread();
2031 * Create the relay command pipe to wake thread_manage_apps.
2032 * Closed in cleanup().
2034 static int create_conn_pipe(void)
2036 return utils_create_pipe_cloexec(live_conn_pipe
);
2039 int relayd_live_join(void)
2041 int ret
, retval
= 0;
2044 ret
= pthread_join(live_listener_thread
, &status
);
2047 PERROR("pthread_join live listener");
2051 ret
= pthread_join(live_worker_thread
, &status
);
2054 PERROR("pthread_join live worker");
2058 ret
= pthread_join(live_dispatcher_thread
, &status
);
2061 PERROR("pthread_join live dispatcher");
2065 cleanup_relayd_live();
2073 int relayd_live_create(struct lttng_uri
*uri
)
2075 int ret
= 0, retval
= 0;
2081 goto exit_init_data
;
2085 /* Check if daemon is UID = 0 */
2086 is_root
= !getuid();
2089 if (live_uri
->port
< 1024) {
2090 ERR("Need to be root to use ports < 1024");
2092 goto exit_init_data
;
2096 /* Setup the thread apps communication pipe. */
2097 if (create_conn_pipe()) {
2099 goto exit_init_data
;
2102 /* Init relay command queue. */
2103 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2105 /* Set up max poll set size */
2106 lttng_poll_set_max_size();
2108 /* Setup the dispatcher thread */
2109 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2110 thread_dispatcher
, (void *) NULL
);
2113 PERROR("pthread_create viewer dispatcher");
2115 goto exit_dispatcher_thread
;
2118 /* Setup the worker thread */
2119 ret
= pthread_create(&live_worker_thread
, NULL
,
2120 thread_worker
, NULL
);
2123 PERROR("pthread_create viewer worker");
2125 goto exit_worker_thread
;
2128 /* Setup the listener thread */
2129 ret
= pthread_create(&live_listener_thread
, NULL
,
2130 thread_listener
, (void *) NULL
);
2133 PERROR("pthread_create viewer listener");
2135 goto exit_listener_thread
;
2139 * All OK, started all threads.
2144 * Join on the live_listener_thread should anything be added after
2145 * the live_listener thread's creation.
2148 exit_listener_thread
:
2150 ret
= pthread_join(live_worker_thread
, &status
);
2153 PERROR("pthread_join live worker");
2158 ret
= pthread_join(live_dispatcher_thread
, &status
);
2161 PERROR("pthread_join live dispatcher");
2164 exit_dispatcher_thread
:
2167 cleanup_relayd_live();