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.
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
38 #include <urcu/futex.h>
39 #include <urcu/uatomic.h>
40 #include <urcu/rculist.h>
45 #include <lttng/lttng.h>
46 #include <common/common.h>
47 #include <common/compat/poll.h>
48 #include <common/compat/socket.h>
49 #include <common/compat/endian.h>
50 #include <common/defaults.h>
51 #include <common/futex.h>
52 #include <common/index/index.h>
53 #include <common/sessiond-comm/sessiond-comm.h>
54 #include <common/sessiond-comm/inet.h>
55 #include <common/sessiond-comm/relayd.h>
56 #include <common/uri.h>
57 #include <common/utils.h>
61 #include "lttng-relayd.h"
63 #include "health-relayd.h"
64 #include "testpoint.h"
65 #include "viewer-stream.h"
68 #include "ctf-trace.h"
69 #include "connection.h"
70 #include "viewer-session.h"
72 #define SESSION_BUF_DEFAULT_COUNT 16
74 static struct lttng_uri
*live_uri
;
77 * This pipe is used to inform the worker thread that a command is queued and
78 * ready to be processed.
80 static int live_conn_pipe
[2] = { -1, -1 };
82 /* Shared between threads */
83 static int live_dispatch_thread_exit
;
85 static pthread_t live_listener_thread
;
86 static pthread_t live_dispatcher_thread
;
87 static pthread_t live_worker_thread
;
90 * Relay command queue.
92 * The live_thread_listener and live_thread_dispatcher communicate with this
95 static struct relay_conn_queue viewer_conn_queue
;
97 static uint64_t last_relay_viewer_session_id
;
98 static pthread_mutex_t last_relay_viewer_session_id_lock
=
99 PTHREAD_MUTEX_INITIALIZER
;
105 void cleanup_relayd_live(void)
113 * Receive a request buffer using a given socket, destination allocated buffer
116 * Return the size of the received message or else a negative value on error
117 * with errno being set by recvmsg() syscall.
120 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
124 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
125 if (ret
< 0 || ret
!= size
) {
127 /* Orderly shutdown. Not necessary to print an error. */
128 DBG("Socket %d did an orderly shutdown", sock
->fd
);
130 ERR("Relay failed to receive request.");
139 * Send a response buffer using a given socket, source allocated buffer of
142 * Return the size of the sent message or else a negative value on error with
143 * errno being set by sendmsg() syscall.
146 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
150 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
152 ERR("Relayd failed to send response.");
159 * Atomically check if new streams got added in one of the sessions attached
160 * and reset the flag to 0.
162 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
166 int check_new_streams(struct relay_connection
*conn
)
168 struct relay_session
*session
;
169 unsigned long current_val
;
172 if (!conn
->viewer_session
) {
176 cds_list_for_each_entry_rcu(session
,
177 &conn
->viewer_session
->session_list
,
178 viewer_session_node
) {
179 if (!session_get(session
)) {
182 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
184 session_put(session
);
195 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
196 * this function should ignore the sent flag or not.
198 * Return 0 on success or else a negative value.
201 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
202 struct relay_session
*session
, unsigned int ignore_sent_flag
)
205 struct lttng_viewer_stream send_stream
;
206 struct lttng_ht_iter iter
;
207 struct relay_viewer_stream
*vstream
;
211 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
213 struct ctf_trace
*ctf_trace
;
215 health_code_update();
217 if (!viewer_stream_get(vstream
)) {
221 pthread_mutex_lock(&vstream
->stream
->lock
);
222 /* Ignore if not the same session. */
223 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
224 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
225 pthread_mutex_unlock(&vstream
->stream
->lock
);
226 viewer_stream_put(vstream
);
230 ctf_trace
= vstream
->stream
->trace
;
231 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
232 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
233 send_stream
.metadata_flag
= htobe32(
234 vstream
->stream
->is_metadata
);
235 strncpy(send_stream
.path_name
, vstream
->path_name
,
236 sizeof(send_stream
.path_name
));
237 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
238 sizeof(send_stream
.channel_name
));
240 DBG("Sending stream %" PRIu64
" to viewer",
241 vstream
->stream
->stream_handle
);
242 vstream
->sent_flag
= 1;
243 pthread_mutex_unlock(&vstream
->stream
->lock
);
245 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
246 viewer_stream_put(vstream
);
260 * Create every viewer stream possible for the given session with the seek
261 * type. Three counters *can* be return which are in order the total amount of
262 * viewer stream of the session, the number of unsent stream and the number of
263 * stream created. Those counters can be NULL and thus will be ignored.
265 * Return 0 on success or else a negative value.
268 int make_viewer_streams(struct relay_session
*session
,
269 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
270 uint32_t *nb_created
, bool *closed
)
273 struct lttng_ht_iter iter
;
274 struct ctf_trace
*ctf_trace
;
279 * Hold the session lock to ensure that we see either none or
280 * all initial streams for a session, but no intermediate state.
282 pthread_mutex_lock(&session
->lock
);
284 if (session
->connection_closed
) {
289 * Create viewer streams for relay streams that are ready to be
290 * used for a the given session id only.
293 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
295 struct relay_stream
*stream
;
297 health_code_update();
299 if (!ctf_trace_get(ctf_trace
)) {
303 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
304 struct relay_viewer_stream
*vstream
;
306 if (!stream_get(stream
)) {
310 * stream published is protected by the session
313 if (!stream
->published
) {
316 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
318 vstream
= viewer_stream_create(stream
, seek_t
);
321 ctf_trace_put(ctf_trace
);
327 /* Update number of created stream counter. */
331 if (!vstream
->sent_flag
&& nb_unsent
) {
332 /* Update number of unsent stream counter. */
335 viewer_stream_put(vstream
);
337 /* Update number of total stream counter. */
344 ctf_trace_put(ctf_trace
);
351 pthread_mutex_unlock(&session
->lock
);
355 int relayd_live_stop(void)
357 /* Stop dispatch thread */
358 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
359 futex_nto1_wake(&viewer_conn_queue
.futex
);
364 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
367 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
371 if (events
== NULL
|| size
== 0) {
376 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
382 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
394 * Check if the thread quit pipe was triggered.
396 * Return 1 if it was triggered else 0;
399 int check_thread_quit_pipe(int fd
, uint32_t events
)
401 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
409 * Create and init socket from uri.
412 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
415 struct lttcomm_sock
*sock
= NULL
;
417 sock
= lttcomm_alloc_sock_from_uri(uri
);
419 ERR("Allocating socket");
423 ret
= lttcomm_create_sock(sock
);
427 DBG("Listening on sock %d for live", sock
->fd
);
429 ret
= sock
->ops
->bind(sock
);
434 ret
= sock
->ops
->listen(sock
, -1);
444 lttcomm_destroy_sock(sock
);
450 * This thread manages the listening for new connections on the network
453 void *thread_listener(void *data
)
455 int i
, ret
, pollfd
, err
= -1;
456 uint32_t revents
, nb_fd
;
457 struct lttng_poll_event events
;
458 struct lttcomm_sock
*live_control_sock
;
460 DBG("[thread] Relay live listener started");
462 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
464 health_code_update();
466 live_control_sock
= init_socket(live_uri
);
467 if (!live_control_sock
) {
468 goto error_sock_control
;
471 /* Pass 2 as size here for the thread quit pipe and control sockets. */
472 ret
= create_thread_poll_set(&events
, 2);
474 goto error_create_poll
;
477 /* Add the control socket */
478 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
483 lttng_relay_notify_ready();
485 if (testpoint(relayd_thread_live_listener
)) {
486 goto error_testpoint
;
490 health_code_update();
492 DBG("Listener accepting live viewers connections");
496 ret
= lttng_poll_wait(&events
, -1);
500 * Restart interrupted system call.
502 if (errno
== EINTR
) {
509 DBG("Relay new viewer connection received");
510 for (i
= 0; i
< nb_fd
; i
++) {
511 health_code_update();
513 /* Fetch once the poll data */
514 revents
= LTTNG_POLL_GETEV(&events
, i
);
515 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
518 /* No activity for this FD (poll implementation). */
522 /* Thread quit pipe has been closed. Killing thread. */
523 ret
= check_thread_quit_pipe(pollfd
, revents
);
529 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
530 ERR("socket poll error");
532 } else if (revents
& LPOLLIN
) {
534 * A new connection is requested, therefore a
535 * viewer connection is allocated in this
536 * thread, enqueued to a global queue and
537 * dequeued (and freed) in the worker thread.
540 struct relay_connection
*new_conn
;
541 struct lttcomm_sock
*newsock
;
543 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
545 PERROR("accepting control sock");
548 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
550 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
553 PERROR("setsockopt inet");
554 lttcomm_destroy_sock(newsock
);
557 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
559 lttcomm_destroy_sock(newsock
);
562 /* Ownership assumed by the connection. */
565 /* Enqueue request for the dispatcher thread. */
566 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
570 * Wake the dispatch queue futex.
571 * Implicit memory barrier with the
572 * exchange in cds_wfcq_enqueue.
574 futex_nto1_wake(&viewer_conn_queue
.futex
);
583 lttng_poll_clean(&events
);
585 if (live_control_sock
->fd
>= 0) {
586 ret
= live_control_sock
->ops
->close(live_control_sock
);
591 lttcomm_destroy_sock(live_control_sock
);
595 DBG("Live viewer listener thread exited with error");
597 health_unregister(health_relayd
);
598 DBG("Live viewer listener thread cleanup complete");
599 if (lttng_relay_stop_threads()) {
600 ERR("Error stopping threads");
606 * This thread manages the dispatching of the requests to worker threads
609 void *thread_dispatcher(void *data
)
613 struct cds_wfcq_node
*node
;
614 struct relay_connection
*conn
= NULL
;
616 DBG("[thread] Live viewer relay dispatcher started");
618 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
620 if (testpoint(relayd_thread_live_dispatcher
)) {
621 goto error_testpoint
;
624 health_code_update();
626 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
627 health_code_update();
629 /* Atomically prepare the queue futex */
630 futex_nto1_prepare(&viewer_conn_queue
.futex
);
633 health_code_update();
635 /* Dequeue commands */
636 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
637 &viewer_conn_queue
.tail
);
639 DBG("Woken up but nothing in the live-viewer "
640 "relay command queue");
641 /* Continue thread execution */
644 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
645 DBG("Dispatching viewer request waiting on sock %d",
649 * Inform worker thread of the new request. This
650 * call is blocking so we can be assured that
651 * the data will be read at some point in time
652 * or wait to the end of the world :)
654 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
656 PERROR("write conn pipe");
657 connection_put(conn
);
660 } while (node
!= NULL
);
662 /* Futex wait on queue. Blocking call on futex() */
664 futex_nto1_wait(&viewer_conn_queue
.futex
);
668 /* Normal exit, no error */
675 ERR("Health error occurred in %s", __func__
);
677 health_unregister(health_relayd
);
678 DBG("Live viewer dispatch thread dying");
679 if (lttng_relay_stop_threads()) {
680 ERR("Error stopping threads");
686 * Establish connection with the viewer and check the versions.
688 * Return 0 on success or else negative value.
691 int viewer_connect(struct relay_connection
*conn
)
694 struct lttng_viewer_connect reply
, msg
;
696 conn
->version_check_done
= 1;
698 health_code_update();
700 DBG("Viewer is establishing a connection to the relayd.");
702 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
707 health_code_update();
709 memset(&reply
, 0, sizeof(reply
));
710 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
711 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
713 /* Major versions must be the same */
714 if (reply
.major
!= be32toh(msg
.major
)) {
715 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
716 reply
.major
, be32toh(msg
.major
));
721 conn
->major
= reply
.major
;
722 /* We adapt to the lowest compatible version */
723 if (reply
.minor
<= be32toh(msg
.minor
)) {
724 conn
->minor
= reply
.minor
;
726 conn
->minor
= be32toh(msg
.minor
);
729 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
730 conn
->type
= RELAY_VIEWER_COMMAND
;
731 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
732 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
734 ERR("Unknown connection type : %u", be32toh(msg
.type
));
739 reply
.major
= htobe32(reply
.major
);
740 reply
.minor
= htobe32(reply
.minor
);
741 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
743 * Increment outside of htobe64 macro, because the argument can
744 * be used more than once within the macro, and thus the
745 * operation may be undefined.
747 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
748 last_relay_viewer_session_id
++;
749 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
750 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
753 health_code_update();
755 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
760 health_code_update();
762 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
770 * Send the viewer the list of current sessions.
771 * We need to create a copy of the hash table content because otherwise
772 * we cannot assume the number of entries stays the same between getting
773 * the number of HT elements and iteration over the HT.
775 * Return 0 on success or else a negative value.
778 int viewer_list_sessions(struct relay_connection
*conn
)
781 struct lttng_viewer_list_sessions session_list
;
782 struct lttng_ht_iter iter
;
783 struct relay_session
*session
;
784 struct lttng_viewer_session
*send_session_buf
= NULL
;
785 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
788 DBG("List sessions received");
790 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
791 if (!send_session_buf
) {
796 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
798 struct lttng_viewer_session
*send_session
;
800 health_code_update();
802 if (count
>= buf_count
) {
803 struct lttng_viewer_session
*newbuf
;
804 uint32_t new_buf_count
= buf_count
<< 1;
806 newbuf
= realloc(send_session_buf
,
807 new_buf_count
* sizeof(*send_session_buf
));
813 send_session_buf
= newbuf
;
814 buf_count
= new_buf_count
;
816 send_session
= &send_session_buf
[count
];
817 strncpy(send_session
->session_name
, session
->session_name
,
818 sizeof(send_session
->session_name
));
819 strncpy(send_session
->hostname
, session
->hostname
,
820 sizeof(send_session
->hostname
));
821 send_session
->id
= htobe64(session
->id
);
822 send_session
->live_timer
= htobe32(session
->live_timer
);
823 if (session
->viewer_attached
) {
824 send_session
->clients
= htobe32(1);
826 send_session
->clients
= htobe32(0);
828 send_session
->streams
= htobe32(session
->stream_count
);
833 session_list
.sessions_count
= htobe32(count
);
835 health_code_update();
837 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
842 health_code_update();
844 ret
= send_response(conn
->sock
, send_session_buf
,
845 count
* sizeof(*send_session_buf
));
849 health_code_update();
853 free(send_session_buf
);
858 * Send the viewer the list of current streams.
861 int viewer_get_new_streams(struct relay_connection
*conn
)
863 int ret
, send_streams
= 0;
864 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
865 struct lttng_viewer_new_streams_request request
;
866 struct lttng_viewer_new_streams_response response
;
867 struct relay_session
*session
;
873 DBG("Get new streams received");
875 health_code_update();
877 /* Receive the request from the connected client. */
878 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
882 session_id
= be64toh(request
.session_id
);
884 health_code_update();
886 memset(&response
, 0, sizeof(response
));
888 session
= session_get_by_id(session_id
);
890 DBG("Relay session %" PRIu64
" not found", session_id
);
891 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
895 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
897 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
902 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
904 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
905 &nb_created
, &closed
);
907 goto end_put_session
;
909 /* Only send back the newly created streams with the unsent ones. */
910 nb_streams
= nb_created
+ nb_unsent
;
911 response
.streams_count
= htobe32(nb_streams
);
914 * If the session is closed, HUP when there are no more streams.
916 if (closed
&& nb_total
== 0) {
918 response
.streams_count
= 0;
919 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
924 health_code_update();
925 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
927 goto end_put_session
;
929 health_code_update();
932 * Unknown or empty session, just return gracefully, the viewer
933 * knows what is happening.
935 if (!send_streams
|| !nb_streams
) {
937 goto end_put_session
;
941 * Send stream and *DON'T* ignore the sent flag so every viewer
942 * streams that were not sent from that point will be sent to
945 ret
= send_viewer_streams(conn
->sock
, session
, 0);
947 goto end_put_session
;
952 session_put(session
);
959 * Send the viewer the list of current sessions.
962 int viewer_attach_session(struct relay_connection
*conn
)
964 int send_streams
= 0;
966 uint32_t nb_streams
= 0;
967 enum lttng_viewer_seek seek_type
;
968 struct lttng_viewer_attach_session_request request
;
969 struct lttng_viewer_attach_session_response response
;
970 struct relay_session
*session
= NULL
;
975 health_code_update();
977 /* Receive the request from the connected client. */
978 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
983 health_code_update();
985 memset(&response
, 0, sizeof(response
));
987 if (!conn
->viewer_session
) {
988 DBG("Client trying to attach before creating a live viewer session");
989 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
993 session
= session_get_by_id(be64toh(request
.session_id
));
995 DBG("Relay session %" PRIu64
" not found",
996 be64toh(request
.session_id
));
997 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1000 DBG("Attach session ID %" PRIu64
" received",
1001 be64toh(request
.session_id
));
1003 if (session
->live_timer
== 0) {
1004 DBG("Not live session");
1005 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1010 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1012 DBG("Already a viewer attached");
1013 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1017 switch (be32toh(request
.seek
)) {
1018 case LTTNG_VIEWER_SEEK_BEGINNING
:
1019 case LTTNG_VIEWER_SEEK_LAST
:
1020 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1021 seek_type
= be32toh(request
.seek
);
1024 ERR("Wrong seek parameter");
1025 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1030 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1033 goto end_put_session
;
1035 response
.streams_count
= htobe32(nb_streams
);
1038 * If the session is closed when the viewer is attaching, it
1039 * means some of the streams may have been concurrently removed,
1040 * so we don't allow the viewer to attach, even if there are
1041 * streams available.
1045 response
.streams_count
= 0;
1046 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1051 health_code_update();
1052 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1054 goto end_put_session
;
1056 health_code_update();
1059 * Unknown or empty session, just return gracefully, the viewer
1060 * knows what is happening.
1062 if (!send_streams
|| !nb_streams
) {
1064 goto end_put_session
;
1067 /* Send stream and ignore the sent flag. */
1068 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1070 goto end_put_session
;
1075 session_put(session
);
1082 * Open the index file if needed for the given vstream.
1084 * If an index file is successfully opened, the vstream index_fd set with
1087 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1089 * Called with rstream lock held.
1091 static int try_open_index(struct relay_viewer_stream
*vstream
,
1092 struct relay_stream
*rstream
)
1096 if (vstream
->index_fd
) {
1101 * First time, we open the index file and at least one index is ready.
1103 if (rstream
->total_index_received
== 0) {
1107 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1108 vstream
->stream
->tracefile_count
,
1109 vstream
->current_tracefile_id
);
1111 vstream
->index_fd
= stream_fd_create(ret
);
1112 if (!vstream
->index_fd
) {
1128 * Check the status of the index for the given stream. This function
1129 * updates the index structure if needed and can put (close) the vstream
1130 * in the HUP situation.
1132 * Return 0 means that we can proceed with the index. A value of 1 means
1133 * that the index has been updated and is ready to be sent to the
1134 * client. A negative value indicates an error that can't be handled.
1136 * Called with rstream lock held.
1138 static int check_index_status(struct relay_viewer_stream
*vstream
,
1139 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1140 struct lttng_viewer_index
*index
)
1144 if (trace
->session
->connection_closed
1145 && rstream
->total_index_received
1146 == vstream
->last_sent_index
) {
1147 /* Last index sent and session connection is closed. */
1148 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1150 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1151 rstream
->total_index_received
1152 == vstream
->last_sent_index
) {
1154 * We've received a synchronization beacon and the last index
1155 * available has been sent, the index for now is inactive.
1157 * In this case, we have received a beacon which allows us to
1158 * inform the client of a time interval during which we can
1159 * guarantee that there are no events to read (and never will
1162 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1163 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1164 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1166 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
) {
1168 * This actually checks the case where recv == last_sent.
1169 * In this case, we have not received a beacon. Therefore, we
1170 * can only ask the client to retry later.
1172 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1174 } else if (!viewer_stream_is_tracefile_seq_readable(vstream
,
1175 vstream
->current_tracefile_seq
)) {
1177 * The producer has overwritten our current file. We
1180 DBG("Viewer stream %" PRIu64
" rotation due to overwrite",
1181 vstream
->stream
->stream_handle
);
1182 ret
= viewer_stream_rotate(vstream
);
1185 } else if (ret
== 1) {
1186 /* EOF across entire stream. */
1187 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1190 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1191 vstream
->current_tracefile_seq
));
1192 /* ret == 0 means successful so we continue. */
1199 * Use EOF on current index file to find out when we
1202 read_ret
= lttng_read(vstream
->index_fd
->fd
, tmp
, 1);
1203 if (read_ret
== 1) {
1206 /* There is still data to read. Rewind position. */
1207 seek_ret
= lseek(vstream
->index_fd
->fd
, -1, SEEK_CUR
);
1213 } else if (read_ret
== 0) {
1214 /* EOF. We need to rotate. */
1215 DBG("Viewer stream %" PRIu64
" rotation due to EOF",
1216 vstream
->stream
->stream_handle
);
1217 ret
= viewer_stream_rotate(vstream
);
1220 } else if (ret
== 1) {
1221 /* EOF across entire stream. */
1222 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1225 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1226 vstream
->current_tracefile_seq
));
1227 /* ret == 0 means successful so we continue. */
1230 /* Error reading index. */
1238 viewer_stream_put(vstream
);
1244 * Send the next index for a stream.
1246 * Return 0 on success or else a negative value.
1249 int viewer_get_next_index(struct relay_connection
*conn
)
1253 struct lttng_viewer_get_next_index request_index
;
1254 struct lttng_viewer_index viewer_index
;
1255 struct ctf_packet_index packet_index
;
1256 struct relay_viewer_stream
*vstream
= NULL
;
1257 struct relay_stream
*rstream
= NULL
;
1258 struct ctf_trace
*ctf_trace
= NULL
;
1259 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1263 DBG("Viewer get next index");
1265 memset(&viewer_index
, 0, sizeof(viewer_index
));
1266 health_code_update();
1268 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1272 health_code_update();
1274 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1280 /* Use back. ref. Protected by refcounts. */
1281 rstream
= vstream
->stream
;
1282 ctf_trace
= rstream
->trace
;
1284 /* metadata_viewer_stream may be NULL. */
1285 metadata_viewer_stream
=
1286 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1288 pthread_mutex_lock(&rstream
->lock
);
1291 * The viewer should not ask for index on metadata stream.
1293 if (rstream
->is_metadata
) {
1294 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1298 /* Try to open an index if one is needed for that stream. */
1299 ret
= try_open_index(vstream
, rstream
);
1301 if (ret
== -ENOENT
) {
1303 * The index is created only when the first data
1304 * packet arrives, it might not be ready at the
1305 * beginning of the session
1307 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1309 /* Unhandled error. */
1310 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1315 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1318 } else if (ret
== 1) {
1320 * We have no index to send and check_index_status has populated
1321 * viewer_index's status.
1325 /* At this point, ret is 0 thus we will be able to read the index. */
1329 * vstream->stream_fd may be NULL if it has been closed by
1330 * tracefile rotation, or if we are at the beginning of the
1331 * stream. We open the data stream file here to protect against
1332 * overwrite caused by tracefile rotation (in association with
1333 * unlink performed before overwrite).
1335 if (!vstream
->stream_fd
) {
1336 char fullpath
[PATH_MAX
];
1338 if (vstream
->stream
->tracefile_count
> 0) {
1339 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1341 vstream
->channel_name
,
1342 vstream
->current_tracefile_id
);
1344 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1346 vstream
->channel_name
);
1351 ret
= open(fullpath
, O_RDONLY
);
1353 PERROR("Relay opening trace file");
1356 vstream
->stream_fd
= stream_fd_create(ret
);
1357 if (!vstream
->stream_fd
) {
1365 ret
= check_new_streams(conn
);
1367 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1369 } else if (ret
== 1) {
1370 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1373 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1374 sizeof(packet_index
));
1375 if (read_ret
< sizeof(packet_index
)) {
1376 ERR("Relay reading index file %d returned %zd",
1377 vstream
->index_fd
->fd
, read_ret
);
1378 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1381 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1382 vstream
->last_sent_index
++;
1386 * Indexes are stored in big endian, no need to switch before sending.
1388 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1389 rstream
->stream_handle
,
1390 be64toh(packet_index
.offset
));
1391 viewer_index
.offset
= packet_index
.offset
;
1392 viewer_index
.packet_size
= packet_index
.packet_size
;
1393 viewer_index
.content_size
= packet_index
.content_size
;
1394 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1395 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1396 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1397 viewer_index
.stream_id
= packet_index
.stream_id
;
1400 pthread_mutex_unlock(&rstream
->lock
);
1402 if (metadata_viewer_stream
) {
1403 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1404 DBG("get next index metadata check: recv %" PRIu64
1406 metadata_viewer_stream
->stream
->metadata_received
,
1407 metadata_viewer_stream
->metadata_sent
);
1408 if (!metadata_viewer_stream
->stream
->metadata_received
||
1409 metadata_viewer_stream
->stream
->metadata_received
>
1410 metadata_viewer_stream
->metadata_sent
) {
1411 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1413 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1416 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1417 health_code_update();
1419 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1423 health_code_update();
1425 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1426 vstream
->last_sent_index
,
1427 vstream
->stream
->stream_handle
);
1429 if (metadata_viewer_stream
) {
1430 viewer_stream_put(metadata_viewer_stream
);
1433 viewer_stream_put(vstream
);
1438 pthread_mutex_unlock(&rstream
->lock
);
1439 if (metadata_viewer_stream
) {
1440 viewer_stream_put(metadata_viewer_stream
);
1442 viewer_stream_put(vstream
);
1447 * Send the next index for a stream
1449 * Return 0 on success or else a negative value.
1452 int viewer_get_packet(struct relay_connection
*conn
)
1454 int ret
, send_data
= 0;
1458 struct lttng_viewer_get_packet get_packet_info
;
1459 struct lttng_viewer_trace_packet reply
;
1460 struct relay_viewer_stream
*vstream
= NULL
;
1461 struct ctf_trace
*ctf_trace
;
1462 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1464 DBG2("Relay get data packet");
1466 health_code_update();
1468 ret
= recv_request(conn
->sock
, &get_packet_info
,
1469 sizeof(get_packet_info
));
1473 health_code_update();
1475 /* From this point on, the error label can be reached. */
1476 memset(&reply
, 0, sizeof(reply
));
1478 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1483 ctf_trace
= vstream
->stream
->trace
;
1485 /* metadata_viewer_stream may be NULL. */
1486 metadata_viewer_stream
=
1487 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1489 if (metadata_viewer_stream
) {
1490 bool get_packet_err
= false;
1492 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1493 DBG("get packet metadata check: recv %" PRIu64
" sent %" PRIu64
,
1494 metadata_viewer_stream
->stream
->metadata_received
,
1495 metadata_viewer_stream
->metadata_sent
);
1496 if (!metadata_viewer_stream
->stream
->metadata_received
||
1497 metadata_viewer_stream
->stream
->metadata_received
>
1498 metadata_viewer_stream
->metadata_sent
) {
1500 * We prevent the client from reading a data stream as
1501 * long as there is metadata left to consume. This
1502 * ensures that the client won't receive data of which
1503 * it can't make sense.
1505 get_packet_err
= true;
1507 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1508 viewer_stream_put(metadata_viewer_stream
);
1509 if (get_packet_err
) {
1510 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1511 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1512 goto send_reply_nolock
;
1516 pthread_mutex_lock(&vstream
->stream
->lock
);
1518 * The vstream->stream_fd used here has been opened by
1519 * get_next_index. It is opened there because this is what
1520 * allows us to grab a reference to the file with stream lock
1521 * held, thus protecting us against overwrite caused by
1522 * tracefile rotation. Since tracefile rotation unlinks the old
1523 * data file, we are ensured that we won't have our data
1524 * overwritten under us.
1526 ret
= check_new_streams(conn
);
1529 } else if (ret
== 1) {
1530 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1531 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1535 len
= be32toh(get_packet_info
.len
);
1536 data
= zmalloc(len
);
1538 PERROR("relay data zmalloc");
1542 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1545 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1546 be64toh(get_packet_info
.offset
));
1549 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1550 if (read_len
< len
) {
1551 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1552 vstream
->stream_fd
->fd
,
1553 be64toh(get_packet_info
.offset
));
1556 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1557 reply
.len
= htobe32(len
);
1562 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1566 pthread_mutex_unlock(&vstream
->stream
->lock
);
1569 reply
.flags
= htobe32(reply
.flags
);
1571 health_code_update();
1573 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1577 health_code_update();
1580 health_code_update();
1581 ret
= send_response(conn
->sock
, data
, len
);
1585 health_code_update();
1588 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1589 be64toh(get_packet_info
.stream_id
));
1595 viewer_stream_put(vstream
);
1601 * Send the session's metadata
1603 * Return 0 on success else a negative value.
1606 int viewer_get_metadata(struct relay_connection
*conn
)
1612 struct lttng_viewer_get_metadata request
;
1613 struct lttng_viewer_metadata_packet reply
;
1614 struct relay_viewer_stream
*vstream
= NULL
;
1618 DBG("Relay get metadata");
1620 health_code_update();
1622 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1626 health_code_update();
1628 memset(&reply
, 0, sizeof(reply
));
1630 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1633 * The metadata stream can be closed by a CLOSE command
1634 * just before we attach. It can also be closed by
1635 * per-pid tracing during tracing. Therefore, it is
1636 * possible that we cannot find this viewer stream.
1637 * Reply back to the client with an error if we cannot
1640 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1643 pthread_mutex_lock(&vstream
->stream
->lock
);
1644 if (!vstream
->stream
->is_metadata
) {
1645 ERR("Invalid metadata stream");
1649 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1651 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1653 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1657 /* first time, we open the metadata file */
1658 if (!vstream
->stream_fd
) {
1659 char fullpath
[PATH_MAX
];
1661 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1662 vstream
->channel_name
);
1666 ret
= open(fullpath
, O_RDONLY
);
1668 PERROR("Relay opening metadata file");
1671 vstream
->stream_fd
= stream_fd_create(ret
);
1672 if (!vstream
->stream_fd
) {
1680 reply
.len
= htobe64(len
);
1681 data
= zmalloc(len
);
1683 PERROR("viewer metadata zmalloc");
1687 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1688 if (read_len
< len
) {
1689 PERROR("Relay reading metadata file");
1692 vstream
->metadata_sent
+= read_len
;
1693 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1694 && vstream
->stream
->closed
) {
1695 /* Release ownership for the viewer metadata stream. */
1696 viewer_stream_put(vstream
);
1699 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1704 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1707 health_code_update();
1709 pthread_mutex_unlock(&vstream
->stream
->lock
);
1711 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1715 health_code_update();
1718 ret
= send_response(conn
->sock
, data
, len
);
1724 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1725 be64toh(request
.stream_id
));
1727 DBG("Metadata sent");
1733 viewer_stream_put(vstream
);
1739 * Create a viewer session.
1741 * Return 0 on success or else a negative value.
1744 int viewer_create_session(struct relay_connection
*conn
)
1747 struct lttng_viewer_create_session_response resp
;
1749 DBG("Viewer create session received");
1751 memset(&resp
, 0, sizeof(resp
));
1752 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1753 conn
->viewer_session
= viewer_session_create();
1754 if (!conn
->viewer_session
) {
1755 ERR("Allocation viewer session");
1756 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1761 health_code_update();
1762 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1766 health_code_update();
1775 * live_relay_unknown_command: send -1 if received unknown command
1778 void live_relay_unknown_command(struct relay_connection
*conn
)
1780 struct lttcomm_relayd_generic_reply reply
;
1782 memset(&reply
, 0, sizeof(reply
));
1783 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1784 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1788 * Process the commands received on the control socket
1791 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1792 struct relay_connection
*conn
)
1797 msg_value
= be32toh(recv_hdr
->cmd
);
1800 * Make sure we've done the version check before any command other then a
1801 * new client connection.
1803 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1804 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1809 switch (msg_value
) {
1810 case LTTNG_VIEWER_CONNECT
:
1811 ret
= viewer_connect(conn
);
1813 case LTTNG_VIEWER_LIST_SESSIONS
:
1814 ret
= viewer_list_sessions(conn
);
1816 case LTTNG_VIEWER_ATTACH_SESSION
:
1817 ret
= viewer_attach_session(conn
);
1819 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1820 ret
= viewer_get_next_index(conn
);
1822 case LTTNG_VIEWER_GET_PACKET
:
1823 ret
= viewer_get_packet(conn
);
1825 case LTTNG_VIEWER_GET_METADATA
:
1826 ret
= viewer_get_metadata(conn
);
1828 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1829 ret
= viewer_get_new_streams(conn
);
1831 case LTTNG_VIEWER_CREATE_SESSION
:
1832 ret
= viewer_create_session(conn
);
1835 ERR("Received unknown viewer command (%u)",
1836 be32toh(recv_hdr
->cmd
));
1837 live_relay_unknown_command(conn
);
1847 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1851 (void) lttng_poll_del(events
, pollfd
);
1853 ret
= close(pollfd
);
1855 ERR("Closing pollfd %d", pollfd
);
1860 * This thread does the actual work
1863 void *thread_worker(void *data
)
1867 struct lttng_poll_event events
;
1868 struct lttng_ht
*viewer_connections_ht
;
1869 struct lttng_ht_iter iter
;
1870 struct lttng_viewer_cmd recv_hdr
;
1871 struct relay_connection
*destroy_conn
;
1873 DBG("[thread] Live viewer relay worker started");
1875 rcu_register_thread();
1877 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1879 if (testpoint(relayd_thread_live_worker
)) {
1880 goto error_testpoint
;
1883 /* table of connections indexed on socket */
1884 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1885 if (!viewer_connections_ht
) {
1886 goto viewer_connections_ht_error
;
1889 ret
= create_thread_poll_set(&events
, 2);
1891 goto error_poll_create
;
1894 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1903 health_code_update();
1905 /* Infinite blocking call, waiting for transmission */
1906 DBG3("Relayd live viewer worker thread polling...");
1907 health_poll_entry();
1908 ret
= lttng_poll_wait(&events
, -1);
1912 * Restart interrupted system call.
1914 if (errno
== EINTR
) {
1923 * Process control. The control connection is prioritised so we don't
1924 * starve it with high throughput tracing data on the data
1927 for (i
= 0; i
< nb_fd
; i
++) {
1928 /* Fetch once the poll data */
1929 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1930 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1932 health_code_update();
1935 /* No activity for this FD (poll implementation). */
1939 /* Thread quit pipe has been closed. Killing thread. */
1940 ret
= check_thread_quit_pipe(pollfd
, revents
);
1946 /* Inspect the relay conn pipe for new connection. */
1947 if (pollfd
== live_conn_pipe
[0]) {
1948 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1949 ERR("Relay live pipe error");
1951 } else if (revents
& LPOLLIN
) {
1952 struct relay_connection
*conn
;
1954 ret
= lttng_read(live_conn_pipe
[0],
1955 &conn
, sizeof(conn
));
1959 lttng_poll_add(&events
, conn
->sock
->fd
,
1960 LPOLLIN
| LPOLLRDHUP
);
1961 connection_ht_add(viewer_connections_ht
, conn
);
1962 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1965 /* Connection activity. */
1966 struct relay_connection
*conn
;
1968 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1973 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1974 cleanup_connection_pollfd(&events
, pollfd
);
1975 /* Put "create" ownership reference. */
1976 connection_put(conn
);
1977 } else if (revents
& LPOLLIN
) {
1978 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1979 sizeof(recv_hdr
), 0);
1981 /* Connection closed. */
1982 cleanup_connection_pollfd(&events
, pollfd
);
1983 /* Put "create" ownership reference. */
1984 connection_put(conn
);
1985 DBG("Viewer control conn closed with %d", pollfd
);
1987 ret
= process_control(&recv_hdr
, conn
);
1989 /* Clear the session on error. */
1990 cleanup_connection_pollfd(&events
, pollfd
);
1991 /* Put "create" ownership reference. */
1992 connection_put(conn
);
1993 DBG("Viewer connection closed with %d", pollfd
);
1997 /* Put local "get_by_sock" reference. */
1998 connection_put(conn
);
2005 lttng_poll_clean(&events
);
2007 /* Cleanup reamaining connection object. */
2009 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
2012 health_code_update();
2013 connection_put(destroy_conn
);
2017 lttng_ht_destroy(viewer_connections_ht
);
2018 viewer_connections_ht_error
:
2019 /* Close relay conn pipes */
2020 utils_close_pipe(live_conn_pipe
);
2022 DBG("Viewer worker thread exited with error");
2024 DBG("Viewer worker thread cleanup complete");
2028 ERR("Health error occurred in %s", __func__
);
2030 health_unregister(health_relayd
);
2031 if (lttng_relay_stop_threads()) {
2032 ERR("Error stopping threads");
2034 rcu_unregister_thread();
2039 * Create the relay command pipe to wake thread_manage_apps.
2040 * Closed in cleanup().
2042 static int create_conn_pipe(void)
2044 return utils_create_pipe_cloexec(live_conn_pipe
);
2047 int relayd_live_join(void)
2049 int ret
, retval
= 0;
2052 ret
= pthread_join(live_listener_thread
, &status
);
2055 PERROR("pthread_join live listener");
2059 ret
= pthread_join(live_worker_thread
, &status
);
2062 PERROR("pthread_join live worker");
2066 ret
= pthread_join(live_dispatcher_thread
, &status
);
2069 PERROR("pthread_join live dispatcher");
2073 cleanup_relayd_live();
2081 int relayd_live_create(struct lttng_uri
*uri
)
2083 int ret
= 0, retval
= 0;
2089 goto exit_init_data
;
2093 /* Check if daemon is UID = 0 */
2094 is_root
= !getuid();
2097 if (live_uri
->port
< 1024) {
2098 ERR("Need to be root to use ports < 1024");
2100 goto exit_init_data
;
2104 /* Setup the thread apps communication pipe. */
2105 if (create_conn_pipe()) {
2107 goto exit_init_data
;
2110 /* Init relay command queue. */
2111 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2113 /* Set up max poll set size */
2114 if (lttng_poll_set_max_size()) {
2116 goto exit_init_data
;
2119 /* Setup the dispatcher thread */
2120 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2121 thread_dispatcher
, (void *) NULL
);
2124 PERROR("pthread_create viewer dispatcher");
2126 goto exit_dispatcher_thread
;
2129 /* Setup the worker thread */
2130 ret
= pthread_create(&live_worker_thread
, NULL
,
2131 thread_worker
, NULL
);
2134 PERROR("pthread_create viewer worker");
2136 goto exit_worker_thread
;
2139 /* Setup the listener thread */
2140 ret
= pthread_create(&live_listener_thread
, NULL
,
2141 thread_listener
, (void *) NULL
);
2144 PERROR("pthread_create viewer listener");
2146 goto exit_listener_thread
;
2150 * All OK, started all threads.
2155 * Join on the live_listener_thread should anything be added after
2156 * the live_listener thread's creation.
2159 exit_listener_thread
:
2161 ret
= pthread_join(live_worker_thread
, &status
);
2164 PERROR("pthread_join live worker");
2169 ret
= pthread_join(live_dispatcher_thread
, &status
);
2172 PERROR("pthread_join live dispatcher");
2175 exit_dispatcher_thread
:
2178 cleanup_relayd_live();