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>
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>
59 #include "lttng-relayd.h"
61 #include "health-relayd.h"
62 #include "testpoint.h"
63 #include "viewer-stream.h"
66 #include "ctf-trace.h"
67 #include "connection.h"
68 #include "viewer-session.h"
70 #define SESSION_BUF_DEFAULT_COUNT 16
72 static struct lttng_uri
*live_uri
;
75 * This pipe is used to inform the worker thread that a command is queued and
76 * ready to be processed.
78 static int live_conn_pipe
[2] = { -1, -1 };
80 /* Shared between threads */
81 static int live_dispatch_thread_exit
;
83 static pthread_t live_listener_thread
;
84 static pthread_t live_dispatcher_thread
;
85 static pthread_t live_worker_thread
;
88 * Relay command queue.
90 * The live_thread_listener and live_thread_dispatcher communicate with this
93 static struct relay_conn_queue viewer_conn_queue
;
95 static uint64_t last_relay_viewer_session_id
;
96 static pthread_mutex_t last_relay_viewer_session_id_lock
=
97 PTHREAD_MUTEX_INITIALIZER
;
103 void cleanup_relayd_live(void)
111 * Receive a request buffer using a given socket, destination allocated buffer
114 * Return the size of the received message or else a negative value on error
115 * with errno being set by recvmsg() syscall.
118 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
122 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
123 if (ret
< 0 || ret
!= size
) {
125 /* Orderly shutdown. Not necessary to print an error. */
126 DBG("Socket %d did an orderly shutdown", sock
->fd
);
128 ERR("Relay failed to receive request.");
137 * Send a response buffer using a given socket, source allocated buffer of
140 * Return the size of the sent message or else a negative value on error with
141 * errno being set by sendmsg() syscall.
144 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
148 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
150 ERR("Relayd failed to send response.");
157 * Atomically check if new streams got added in one of the sessions attached
158 * and reset the flag to 0.
160 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
164 int check_new_streams(struct relay_connection
*conn
)
166 struct relay_session
*session
;
167 unsigned long current_val
;
170 if (!conn
->viewer_session
) {
174 cds_list_for_each_entry_rcu(session
,
175 &conn
->viewer_session
->session_list
,
176 viewer_session_node
) {
177 if (!session_get(session
)) {
180 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
182 session_put(session
);
193 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
194 * this function should ignore the sent flag or not.
196 * Return 0 on success or else a negative value.
199 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
200 struct relay_session
*session
, unsigned int ignore_sent_flag
)
203 struct lttng_viewer_stream send_stream
;
204 struct lttng_ht_iter iter
;
205 struct relay_viewer_stream
*vstream
;
209 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
211 struct ctf_trace
*ctf_trace
;
213 health_code_update();
215 if (!viewer_stream_get(vstream
)) {
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
);
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. */
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. */
249 DBG("Sending stream %" PRIu64
" to viewer",
250 vstream
->stream
->stream_handle
);
251 vstream
->sent_flag
= 1;
252 pthread_mutex_unlock(&vstream
->stream
->lock
);
254 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
255 viewer_stream_put(vstream
);
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.
274 * Return 0 on success or else a negative value.
277 int make_viewer_streams(struct relay_session
*session
,
278 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
279 uint32_t *nb_created
, bool *closed
)
282 struct lttng_ht_iter iter
;
283 struct ctf_trace
*ctf_trace
;
288 * Hold the session lock to ensure that we see either none or
289 * all initial streams for a session, but no intermediate state.
291 pthread_mutex_lock(&session
->lock
);
293 if (session
->connection_closed
) {
298 * Create viewer streams for relay streams that are ready to be
299 * used for a the given session id only.
302 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
304 struct relay_stream
*stream
;
306 health_code_update();
308 if (!ctf_trace_get(ctf_trace
)) {
312 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
313 struct relay_viewer_stream
*vstream
;
315 if (!stream_get(stream
)) {
319 * stream published is protected by the session lock.
321 if (!stream
->published
) {
324 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
326 vstream
= viewer_stream_create(stream
, seek_t
);
329 ctf_trace_put(ctf_trace
);
335 /* Update number of created stream counter. */
339 * Ensure a self-reference is preserved even
340 * after we have put our local reference.
342 viewer_stream_get(vstream
);
344 if (!vstream
->sent_flag
&& nb_unsent
) {
345 /* Update number of unsent stream counter. */
349 /* Update number of total stream counter. */
351 if (stream
->is_metadata
) {
352 if (!stream
->closed
||
353 stream
->metadata_received
> vstream
->metadata_sent
) {
357 if (!stream
->closed
||
358 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
364 /* Put local reference. */
365 viewer_stream_put(vstream
);
369 ctf_trace_put(ctf_trace
);
376 pthread_mutex_unlock(&session
->lock
);
380 int relayd_live_stop(void)
382 /* Stop dispatch thread */
383 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
384 futex_nto1_wake(&viewer_conn_queue
.futex
);
389 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
392 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
396 if (events
== NULL
|| size
== 0) {
401 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
407 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
419 * Check if the thread quit pipe was triggered.
421 * Return 1 if it was triggered else 0;
424 int check_thread_quit_pipe(int fd
, uint32_t events
)
426 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
434 * Create and init socket from uri.
437 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
440 struct lttcomm_sock
*sock
= NULL
;
442 sock
= lttcomm_alloc_sock_from_uri(uri
);
444 ERR("Allocating socket");
448 ret
= lttcomm_create_sock(sock
);
452 DBG("Listening on sock %d for live", sock
->fd
);
454 ret
= sock
->ops
->bind(sock
);
459 ret
= sock
->ops
->listen(sock
, -1);
469 lttcomm_destroy_sock(sock
);
475 * This thread manages the listening for new connections on the network
478 void *thread_listener(void *data
)
480 int i
, ret
, pollfd
, err
= -1;
481 uint32_t revents
, nb_fd
;
482 struct lttng_poll_event events
;
483 struct lttcomm_sock
*live_control_sock
;
485 DBG("[thread] Relay live listener started");
487 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
489 health_code_update();
491 live_control_sock
= init_socket(live_uri
);
492 if (!live_control_sock
) {
493 goto error_sock_control
;
496 /* Pass 2 as size here for the thread quit pipe and control sockets. */
497 ret
= create_thread_poll_set(&events
, 2);
499 goto error_create_poll
;
502 /* Add the control socket */
503 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
508 lttng_relay_notify_ready();
510 if (testpoint(relayd_thread_live_listener
)) {
511 goto error_testpoint
;
515 health_code_update();
517 DBG("Listener accepting live viewers connections");
521 ret
= lttng_poll_wait(&events
, -1);
525 * Restart interrupted system call.
527 if (errno
== EINTR
) {
534 DBG("Relay new viewer connection received");
535 for (i
= 0; i
< nb_fd
; i
++) {
536 health_code_update();
538 /* Fetch once the poll data */
539 revents
= LTTNG_POLL_GETEV(&events
, i
);
540 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
543 /* No activity for this FD (poll implementation). */
547 /* Thread quit pipe has been closed. Killing thread. */
548 ret
= check_thread_quit_pipe(pollfd
, revents
);
554 if (revents
& LPOLLIN
) {
556 * A new connection is requested, therefore a
557 * viewer connection is allocated in this
558 * thread, enqueued to a global queue and
559 * dequeued (and freed) in the worker thread.
562 struct relay_connection
*new_conn
;
563 struct lttcomm_sock
*newsock
;
565 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
567 PERROR("accepting control sock");
570 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
572 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
575 PERROR("setsockopt inet");
576 lttcomm_destroy_sock(newsock
);
579 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
581 lttcomm_destroy_sock(newsock
);
584 /* Ownership assumed by the connection. */
587 /* Enqueue request for the dispatcher thread. */
588 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
592 * Wake the dispatch queue futex.
593 * Implicit memory barrier with the
594 * exchange in cds_wfcq_enqueue.
596 futex_nto1_wake(&viewer_conn_queue
.futex
);
597 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
598 ERR("socket poll error");
601 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
611 lttng_poll_clean(&events
);
613 if (live_control_sock
->fd
>= 0) {
614 ret
= live_control_sock
->ops
->close(live_control_sock
);
619 lttcomm_destroy_sock(live_control_sock
);
623 DBG("Live viewer listener thread exited with error");
625 health_unregister(health_relayd
);
626 DBG("Live viewer listener thread cleanup complete");
627 if (lttng_relay_stop_threads()) {
628 ERR("Error stopping threads");
634 * This thread manages the dispatching of the requests to worker threads
637 void *thread_dispatcher(void *data
)
641 struct cds_wfcq_node
*node
;
642 struct relay_connection
*conn
= NULL
;
644 DBG("[thread] Live viewer relay dispatcher started");
646 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
648 if (testpoint(relayd_thread_live_dispatcher
)) {
649 goto error_testpoint
;
652 health_code_update();
654 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
655 health_code_update();
657 /* Atomically prepare the queue futex */
658 futex_nto1_prepare(&viewer_conn_queue
.futex
);
661 health_code_update();
663 /* Dequeue commands */
664 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
665 &viewer_conn_queue
.tail
);
667 DBG("Woken up but nothing in the live-viewer "
668 "relay command queue");
669 /* Continue thread execution */
672 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
673 DBG("Dispatching viewer request waiting on sock %d",
677 * Inform worker thread of the new request. This
678 * call is blocking so we can be assured that
679 * the data will be read at some point in time
680 * or wait to the end of the world :)
682 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
684 PERROR("write conn pipe");
685 connection_put(conn
);
688 } while (node
!= NULL
);
690 /* Futex wait on queue. Blocking call on futex() */
692 futex_nto1_wait(&viewer_conn_queue
.futex
);
696 /* Normal exit, no error */
703 ERR("Health error occurred in %s", __func__
);
705 health_unregister(health_relayd
);
706 DBG("Live viewer dispatch thread dying");
707 if (lttng_relay_stop_threads()) {
708 ERR("Error stopping threads");
714 * Establish connection with the viewer and check the versions.
716 * Return 0 on success or else negative value.
719 int viewer_connect(struct relay_connection
*conn
)
722 struct lttng_viewer_connect reply
, msg
;
724 conn
->version_check_done
= 1;
726 health_code_update();
728 DBG("Viewer is establishing a connection to the relayd.");
730 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
735 health_code_update();
737 memset(&reply
, 0, sizeof(reply
));
738 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
739 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
741 /* Major versions must be the same */
742 if (reply
.major
!= be32toh(msg
.major
)) {
743 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
744 reply
.major
, be32toh(msg
.major
));
749 conn
->major
= reply
.major
;
750 /* We adapt to the lowest compatible version */
751 if (reply
.minor
<= be32toh(msg
.minor
)) {
752 conn
->minor
= reply
.minor
;
754 conn
->minor
= be32toh(msg
.minor
);
757 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
758 conn
->type
= RELAY_VIEWER_COMMAND
;
759 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
760 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
762 ERR("Unknown connection type : %u", be32toh(msg
.type
));
767 reply
.major
= htobe32(reply
.major
);
768 reply
.minor
= htobe32(reply
.minor
);
769 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
771 * Increment outside of htobe64 macro, because the argument can
772 * be used more than once within the macro, and thus the
773 * operation may be undefined.
775 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
776 last_relay_viewer_session_id
++;
777 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
778 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
781 health_code_update();
783 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
788 health_code_update();
790 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
798 * Send the viewer the list of current sessions.
799 * We need to create a copy of the hash table content because otherwise
800 * we cannot assume the number of entries stays the same between getting
801 * the number of HT elements and iteration over the HT.
803 * Return 0 on success or else a negative value.
806 int viewer_list_sessions(struct relay_connection
*conn
)
809 struct lttng_viewer_list_sessions session_list
;
810 struct lttng_ht_iter iter
;
811 struct relay_session
*session
;
812 struct lttng_viewer_session
*send_session_buf
= NULL
;
813 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
816 DBG("List sessions received");
818 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
819 if (!send_session_buf
) {
824 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
826 struct lttng_viewer_session
*send_session
;
828 health_code_update();
830 if (count
>= buf_count
) {
831 struct lttng_viewer_session
*newbuf
;
832 uint32_t new_buf_count
= buf_count
<< 1;
834 newbuf
= realloc(send_session_buf
,
835 new_buf_count
* sizeof(*send_session_buf
));
840 send_session_buf
= newbuf
;
841 buf_count
= new_buf_count
;
843 send_session
= &send_session_buf
[count
];
844 if (lttng_strncpy(send_session
->session_name
,
845 session
->session_name
,
846 sizeof(send_session
->session_name
))) {
850 if (lttng_strncpy(send_session
->hostname
, session
->hostname
,
851 sizeof(send_session
->hostname
))) {
855 send_session
->id
= htobe64(session
->id
);
856 send_session
->live_timer
= htobe32(session
->live_timer
);
857 if (session
->viewer_attached
) {
858 send_session
->clients
= htobe32(1);
860 send_session
->clients
= htobe32(0);
862 send_session
->streams
= htobe32(session
->stream_count
);
870 session_list
.sessions_count
= htobe32(count
);
872 health_code_update();
874 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
879 health_code_update();
881 ret
= send_response(conn
->sock
, send_session_buf
,
882 count
* sizeof(*send_session_buf
));
886 health_code_update();
890 free(send_session_buf
);
895 * Send the viewer the list of current streams.
898 int viewer_get_new_streams(struct relay_connection
*conn
)
900 int ret
, send_streams
= 0;
901 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
902 struct lttng_viewer_new_streams_request request
;
903 struct lttng_viewer_new_streams_response response
;
904 struct relay_session
*session
;
910 DBG("Get new streams received");
912 health_code_update();
914 /* Receive the request from the connected client. */
915 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
919 session_id
= be64toh(request
.session_id
);
921 health_code_update();
923 memset(&response
, 0, sizeof(response
));
925 session
= session_get_by_id(session_id
);
927 DBG("Relay session %" PRIu64
" not found", session_id
);
928 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
932 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
934 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
939 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
941 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
942 &nb_created
, &closed
);
944 goto end_put_session
;
946 /* Only send back the newly created streams with the unsent ones. */
947 nb_streams
= nb_created
+ nb_unsent
;
948 response
.streams_count
= htobe32(nb_streams
);
951 * If the session is closed, HUP when there are no more streams
954 if (closed
&& nb_total
== 0) {
956 response
.streams_count
= 0;
957 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
962 health_code_update();
963 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
965 goto end_put_session
;
967 health_code_update();
970 * Unknown or empty session, just return gracefully, the viewer
971 * knows what is happening.
973 if (!send_streams
|| !nb_streams
) {
975 goto end_put_session
;
979 * Send stream and *DON'T* ignore the sent flag so every viewer
980 * streams that were not sent from that point will be sent to
983 ret
= send_viewer_streams(conn
->sock
, session
, 0);
985 goto end_put_session
;
990 session_put(session
);
997 * Send the viewer the list of current sessions.
1000 int viewer_attach_session(struct relay_connection
*conn
)
1002 int send_streams
= 0;
1004 uint32_t nb_streams
= 0;
1005 enum lttng_viewer_seek seek_type
;
1006 struct lttng_viewer_attach_session_request request
;
1007 struct lttng_viewer_attach_session_response response
;
1008 struct relay_session
*session
= NULL
;
1009 bool closed
= false;
1013 health_code_update();
1015 /* Receive the request from the connected client. */
1016 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1021 health_code_update();
1023 memset(&response
, 0, sizeof(response
));
1025 if (!conn
->viewer_session
) {
1026 DBG("Client trying to attach before creating a live viewer session");
1027 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1031 session
= session_get_by_id(be64toh(request
.session_id
));
1033 DBG("Relay session %" PRIu64
" not found",
1034 be64toh(request
.session_id
));
1035 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1038 DBG("Attach session ID %" PRIu64
" received",
1039 be64toh(request
.session_id
));
1041 if (session
->live_timer
== 0) {
1042 DBG("Not live session");
1043 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1048 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1050 DBG("Already a viewer attached");
1051 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1055 switch (be32toh(request
.seek
)) {
1056 case LTTNG_VIEWER_SEEK_BEGINNING
:
1057 case LTTNG_VIEWER_SEEK_LAST
:
1058 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1059 seek_type
= be32toh(request
.seek
);
1062 ERR("Wrong seek parameter");
1063 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1068 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1071 goto end_put_session
;
1073 response
.streams_count
= htobe32(nb_streams
);
1076 * If the session is closed when the viewer is attaching, it
1077 * means some of the streams may have been concurrently removed,
1078 * so we don't allow the viewer to attach, even if there are
1079 * streams available.
1083 response
.streams_count
= 0;
1084 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1089 health_code_update();
1090 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1092 goto end_put_session
;
1094 health_code_update();
1097 * Unknown or empty session, just return gracefully, the viewer
1098 * knows what is happening.
1100 if (!send_streams
|| !nb_streams
) {
1102 goto end_put_session
;
1105 /* Send stream and ignore the sent flag. */
1106 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1108 goto end_put_session
;
1113 session_put(session
);
1120 * Open the index file if needed for the given vstream.
1122 * If an index file is successfully opened, the vstream index_fd set with
1125 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1127 * Called with rstream lock held.
1129 static int try_open_index(struct relay_viewer_stream
*vstream
,
1130 struct relay_stream
*rstream
)
1134 if (vstream
->index_fd
) {
1139 * First time, we open the index file and at least one index is ready.
1141 if (rstream
->index_received_seqcount
== 0) {
1145 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1146 vstream
->stream
->tracefile_count
,
1147 vstream
->current_tracefile_id
);
1149 vstream
->index_fd
= stream_fd_create(ret
);
1150 if (!vstream
->index_fd
) {
1166 * Check the status of the index for the given stream. This function
1167 * updates the index structure if needed and can put (close) the vstream
1168 * in the HUP situation.
1170 * Return 0 means that we can proceed with the index. A value of 1 means
1171 * that the index has been updated and is ready to be sent to the
1172 * client. A negative value indicates an error that can't be handled.
1174 * Called with rstream lock held.
1176 static int check_index_status(struct relay_viewer_stream
*vstream
,
1177 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1178 struct lttng_viewer_index
*index
)
1182 if (trace
->session
->connection_closed
1183 && rstream
->index_received_seqcount
1184 == vstream
->index_sent_seqcount
) {
1185 /* Last index sent and session connection is closed. */
1186 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1188 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1189 rstream
->index_received_seqcount
1190 == vstream
->index_sent_seqcount
) {
1192 * We've received a synchronization beacon and the last index
1193 * available has been sent, the index for now is inactive.
1195 * In this case, we have received a beacon which allows us to
1196 * inform the client of a time interval during which we can
1197 * guarantee that there are no events to read (and never will
1200 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1201 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1202 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1204 } else if (rstream
->index_received_seqcount
1205 == vstream
->index_sent_seqcount
) {
1207 * This checks whether received == sent seqcount. In
1208 * this case, we have not received a beacon. Therefore,
1209 * we can only ask the client to retry later.
1211 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1213 } else if (!tracefile_array_seq_in_file(rstream
->tfa
,
1214 vstream
->current_tracefile_id
,
1215 vstream
->index_sent_seqcount
)) {
1217 * The next index we want to send cannot be read either
1218 * because we need to perform a rotation, or due to
1219 * the producer having overwritten its trace file.
1221 DBG("Viewer stream %" PRIu64
" rotation",
1222 vstream
->stream
->stream_handle
);
1223 ret
= viewer_stream_rotate(vstream
);
1226 } else if (ret
== 1) {
1227 /* EOF across entire stream. */
1228 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1232 * If we have been pushed due to overwrite, it
1233 * necessarily means there is data that can be read in
1234 * the stream. If we rotated because we reached the end
1235 * of a tracefile, it means the following tracefile
1236 * needs to contain at least one index, else we would
1237 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1238 * viewer. The updated index_sent_seqcount needs to
1239 * point to a readable index entry now.
1241 * In the case where we "rotate" on a single file, we
1242 * can end up in a case where the requested index is
1243 * still unavailable.
1245 if (rstream
->tracefile_count
== 1 &&
1246 !tracefile_array_seq_in_file(
1248 vstream
->current_tracefile_id
,
1249 vstream
->index_sent_seqcount
)) {
1250 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1253 assert(tracefile_array_seq_in_file(rstream
->tfa
,
1254 vstream
->current_tracefile_id
,
1255 vstream
->index_sent_seqcount
));
1257 /* ret == 0 means successful so we continue. */
1263 viewer_stream_put(vstream
);
1269 * Send the next index for a stream.
1271 * Return 0 on success or else a negative value.
1274 int viewer_get_next_index(struct relay_connection
*conn
)
1278 struct lttng_viewer_get_next_index request_index
;
1279 struct lttng_viewer_index viewer_index
;
1280 struct ctf_packet_index packet_index
;
1281 struct relay_viewer_stream
*vstream
= NULL
;
1282 struct relay_stream
*rstream
= NULL
;
1283 struct ctf_trace
*ctf_trace
= NULL
;
1284 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1288 DBG("Viewer get next index");
1290 memset(&viewer_index
, 0, sizeof(viewer_index
));
1291 health_code_update();
1293 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1297 health_code_update();
1299 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1301 DBG("Client requested index of unknown stream id %" PRIu64
,
1302 be64toh(request_index
.stream_id
));
1303 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1307 /* Use back. ref. Protected by refcounts. */
1308 rstream
= vstream
->stream
;
1309 ctf_trace
= rstream
->trace
;
1311 /* metadata_viewer_stream may be NULL. */
1312 metadata_viewer_stream
=
1313 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1315 pthread_mutex_lock(&rstream
->lock
);
1318 * The viewer should not ask for index on metadata stream.
1320 if (rstream
->is_metadata
) {
1321 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1325 /* Try to open an index if one is needed for that stream. */
1326 ret
= try_open_index(vstream
, rstream
);
1328 if (ret
== -ENOENT
) {
1330 * The index is created only when the first data
1331 * packet arrives, it might not be ready at the
1332 * beginning of the session
1334 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1336 /* Unhandled error. */
1337 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1342 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1345 } else if (ret
== 1) {
1347 * We have no index to send and check_index_status has populated
1348 * viewer_index's status.
1352 /* At this point, ret is 0 thus we will be able to read the index. */
1356 * vstream->stream_fd may be NULL if it has been closed by
1357 * tracefile rotation, or if we are at the beginning of the
1358 * stream. We open the data stream file here to protect against
1359 * overwrite caused by tracefile rotation (in association with
1360 * unlink performed before overwrite).
1362 if (!vstream
->stream_fd
) {
1363 char fullpath
[PATH_MAX
];
1365 if (vstream
->stream
->tracefile_count
> 0) {
1366 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1368 vstream
->channel_name
,
1369 vstream
->current_tracefile_id
);
1371 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1373 vstream
->channel_name
);
1378 ret
= open(fullpath
, O_RDONLY
);
1380 PERROR("Relay opening trace file");
1383 vstream
->stream_fd
= stream_fd_create(ret
);
1384 if (!vstream
->stream_fd
) {
1392 ret
= check_new_streams(conn
);
1394 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1396 } else if (ret
== 1) {
1397 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1400 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1401 sizeof(packet_index
));
1402 if (read_ret
< sizeof(packet_index
)) {
1403 ERR("Relay reading index file %d returned %zd",
1404 vstream
->index_fd
->fd
, read_ret
);
1405 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1408 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1409 vstream
->index_sent_seqcount
++;
1413 * Indexes are stored in big endian, no need to switch before sending.
1415 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1416 rstream
->stream_handle
,
1417 be64toh(packet_index
.offset
));
1418 viewer_index
.offset
= packet_index
.offset
;
1419 viewer_index
.packet_size
= packet_index
.packet_size
;
1420 viewer_index
.content_size
= packet_index
.content_size
;
1421 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1422 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1423 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1424 viewer_index
.stream_id
= packet_index
.stream_id
;
1428 pthread_mutex_unlock(&rstream
->lock
);
1431 if (metadata_viewer_stream
) {
1432 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1433 DBG("get next index metadata check: recv %" PRIu64
1435 metadata_viewer_stream
->stream
->metadata_received
,
1436 metadata_viewer_stream
->metadata_sent
);
1437 if (!metadata_viewer_stream
->stream
->metadata_received
||
1438 metadata_viewer_stream
->stream
->metadata_received
>
1439 metadata_viewer_stream
->metadata_sent
) {
1440 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1442 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1445 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1446 health_code_update();
1448 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1452 health_code_update();
1455 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1456 vstream
->index_sent_seqcount
,
1457 vstream
->stream
->stream_handle
);
1460 if (metadata_viewer_stream
) {
1461 viewer_stream_put(metadata_viewer_stream
);
1464 viewer_stream_put(vstream
);
1469 pthread_mutex_unlock(&rstream
->lock
);
1470 if (metadata_viewer_stream
) {
1471 viewer_stream_put(metadata_viewer_stream
);
1473 viewer_stream_put(vstream
);
1478 * Send the next index for a stream
1480 * Return 0 on success or else a negative value.
1483 int viewer_get_packet(struct relay_connection
*conn
)
1485 int ret
, send_data
= 0;
1489 struct lttng_viewer_get_packet get_packet_info
;
1490 struct lttng_viewer_trace_packet reply
;
1491 struct relay_viewer_stream
*vstream
= NULL
;
1493 DBG2("Relay get data packet");
1495 health_code_update();
1497 ret
= recv_request(conn
->sock
, &get_packet_info
,
1498 sizeof(get_packet_info
));
1502 health_code_update();
1504 /* From this point on, the error label can be reached. */
1505 memset(&reply
, 0, sizeof(reply
));
1507 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1509 DBG("Client requested packet of unknown stream id %" PRIu64
,
1510 be64toh(get_packet_info
.stream_id
));
1511 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1512 goto send_reply_nolock
;
1515 pthread_mutex_lock(&vstream
->stream
->lock
);
1517 len
= be32toh(get_packet_info
.len
);
1518 data
= zmalloc(len
);
1520 PERROR("relay data zmalloc");
1524 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1527 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1528 be64toh(get_packet_info
.offset
));
1531 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1532 if (read_len
< len
) {
1533 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1534 vstream
->stream_fd
->fd
,
1535 be64toh(get_packet_info
.offset
));
1538 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1539 reply
.len
= htobe32(len
);
1544 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1548 pthread_mutex_unlock(&vstream
->stream
->lock
);
1551 reply
.flags
= htobe32(reply
.flags
);
1553 health_code_update();
1555 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1559 health_code_update();
1562 health_code_update();
1563 ret
= send_response(conn
->sock
, data
, len
);
1567 health_code_update();
1570 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1571 be64toh(get_packet_info
.stream_id
));
1577 viewer_stream_put(vstream
);
1583 * Send the session's metadata
1585 * Return 0 on success else a negative value.
1588 int viewer_get_metadata(struct relay_connection
*conn
)
1594 struct lttng_viewer_get_metadata request
;
1595 struct lttng_viewer_metadata_packet reply
;
1596 struct relay_viewer_stream
*vstream
= NULL
;
1600 DBG("Relay get metadata");
1602 health_code_update();
1604 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1608 health_code_update();
1610 memset(&reply
, 0, sizeof(reply
));
1612 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1615 * The metadata stream can be closed by a CLOSE command
1616 * just before we attach. It can also be closed by
1617 * per-pid tracing during tracing. Therefore, it is
1618 * possible that we cannot find this viewer stream.
1619 * Reply back to the client with an error if we cannot
1622 DBG("Client requested metadata of unknown stream id %" PRIu64
,
1623 be64toh(request
.stream_id
));
1624 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1627 pthread_mutex_lock(&vstream
->stream
->lock
);
1628 if (!vstream
->stream
->is_metadata
) {
1629 ERR("Invalid metadata stream");
1633 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1635 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1637 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1641 /* first time, we open the metadata file */
1642 if (!vstream
->stream_fd
) {
1643 char fullpath
[PATH_MAX
];
1645 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1646 vstream
->channel_name
);
1650 ret
= open(fullpath
, O_RDONLY
);
1652 PERROR("Relay opening metadata file");
1655 vstream
->stream_fd
= stream_fd_create(ret
);
1656 if (!vstream
->stream_fd
) {
1664 reply
.len
= htobe64(len
);
1665 data
= zmalloc(len
);
1667 PERROR("viewer metadata zmalloc");
1671 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1672 if (read_len
< len
) {
1673 PERROR("Relay reading metadata file");
1676 vstream
->metadata_sent
+= read_len
;
1677 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1678 && vstream
->stream
->closed
) {
1679 /* Release ownership for the viewer metadata stream. */
1680 viewer_stream_put(vstream
);
1683 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1688 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1691 health_code_update();
1693 pthread_mutex_unlock(&vstream
->stream
->lock
);
1695 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1699 health_code_update();
1702 ret
= send_response(conn
->sock
, data
, len
);
1708 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1709 be64toh(request
.stream_id
));
1711 DBG("Metadata sent");
1717 viewer_stream_put(vstream
);
1723 * Create a viewer session.
1725 * Return 0 on success or else a negative value.
1728 int viewer_create_session(struct relay_connection
*conn
)
1731 struct lttng_viewer_create_session_response resp
;
1733 DBG("Viewer create session received");
1735 memset(&resp
, 0, sizeof(resp
));
1736 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1737 conn
->viewer_session
= viewer_session_create();
1738 if (!conn
->viewer_session
) {
1739 ERR("Allocation viewer session");
1740 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1745 health_code_update();
1746 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1750 health_code_update();
1758 * Detach a viewer session.
1760 * Return 0 on success or else a negative value.
1763 int viewer_detach_session(struct relay_connection
*conn
)
1766 struct lttng_viewer_detach_session_response response
;
1767 struct lttng_viewer_detach_session_request request
;
1768 struct relay_session
*session
= NULL
;
1769 uint64_t viewer_session_to_close
;
1771 DBG("Viewer detach session received");
1775 health_code_update();
1777 /* Receive the request from the connected client. */
1778 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1782 viewer_session_to_close
= be64toh(request
.session_id
);
1784 if (!conn
->viewer_session
) {
1785 DBG("Client trying to detach before creating a live viewer session");
1786 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR
);
1790 health_code_update();
1792 memset(&response
, 0, sizeof(response
));
1793 DBG("Detaching from session ID %" PRIu64
, viewer_session_to_close
);
1795 session
= session_get_by_id(be64toh(request
.session_id
));
1797 DBG("Relay session %" PRIu64
" not found",
1798 be64toh(request
.session_id
));
1799 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK
);
1803 ret
= viewer_session_is_attached(conn
->viewer_session
, session
);
1805 DBG("Not attached to this session");
1806 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR
);
1807 goto send_reply_put
;
1810 viewer_session_close_one_session(conn
->viewer_session
, session
);
1811 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_OK
);
1812 DBG("Session %" PRIu64
" detached.", viewer_session_to_close
);
1815 session_put(session
);
1818 health_code_update();
1819 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1823 health_code_update();
1831 * live_relay_unknown_command: send -1 if received unknown command
1834 void live_relay_unknown_command(struct relay_connection
*conn
)
1836 struct lttcomm_relayd_generic_reply reply
;
1838 memset(&reply
, 0, sizeof(reply
));
1839 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1840 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1844 * Process the commands received on the control socket
1847 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1848 struct relay_connection
*conn
)
1853 msg_value
= be32toh(recv_hdr
->cmd
);
1856 * Make sure we've done the version check before any command other then a
1857 * new client connection.
1859 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1860 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1865 switch (msg_value
) {
1866 case LTTNG_VIEWER_CONNECT
:
1867 ret
= viewer_connect(conn
);
1869 case LTTNG_VIEWER_LIST_SESSIONS
:
1870 ret
= viewer_list_sessions(conn
);
1872 case LTTNG_VIEWER_ATTACH_SESSION
:
1873 ret
= viewer_attach_session(conn
);
1875 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1876 ret
= viewer_get_next_index(conn
);
1878 case LTTNG_VIEWER_GET_PACKET
:
1879 ret
= viewer_get_packet(conn
);
1881 case LTTNG_VIEWER_GET_METADATA
:
1882 ret
= viewer_get_metadata(conn
);
1884 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1885 ret
= viewer_get_new_streams(conn
);
1887 case LTTNG_VIEWER_CREATE_SESSION
:
1888 ret
= viewer_create_session(conn
);
1890 case LTTNG_VIEWER_DETACH_SESSION
:
1891 ret
= viewer_detach_session(conn
);
1894 ERR("Received unknown viewer command (%u)",
1895 be32toh(recv_hdr
->cmd
));
1896 live_relay_unknown_command(conn
);
1906 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1910 (void) lttng_poll_del(events
, pollfd
);
1912 ret
= close(pollfd
);
1914 ERR("Closing pollfd %d", pollfd
);
1919 * This thread does the actual work
1922 void *thread_worker(void *data
)
1926 struct lttng_poll_event events
;
1927 struct lttng_ht
*viewer_connections_ht
;
1928 struct lttng_ht_iter iter
;
1929 struct lttng_viewer_cmd recv_hdr
;
1930 struct relay_connection
*destroy_conn
;
1932 DBG("[thread] Live viewer relay worker started");
1934 rcu_register_thread();
1936 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1938 if (testpoint(relayd_thread_live_worker
)) {
1939 goto error_testpoint
;
1942 /* table of connections indexed on socket */
1943 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1944 if (!viewer_connections_ht
) {
1945 goto viewer_connections_ht_error
;
1948 ret
= create_thread_poll_set(&events
, 2);
1950 goto error_poll_create
;
1953 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1962 health_code_update();
1964 /* Infinite blocking call, waiting for transmission */
1965 DBG3("Relayd live viewer worker thread polling...");
1966 health_poll_entry();
1967 ret
= lttng_poll_wait(&events
, -1);
1971 * Restart interrupted system call.
1973 if (errno
== EINTR
) {
1982 * Process control. The control connection is prioritised so we don't
1983 * starve it with high throughput tracing data on the data
1986 for (i
= 0; i
< nb_fd
; i
++) {
1987 /* Fetch once the poll data */
1988 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1989 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1991 health_code_update();
1994 /* No activity for this FD (poll implementation). */
1998 /* Thread quit pipe has been closed. Killing thread. */
1999 ret
= check_thread_quit_pipe(pollfd
, revents
);
2005 /* Inspect the relay conn pipe for new connection. */
2006 if (pollfd
== live_conn_pipe
[0]) {
2007 if (revents
& LPOLLIN
) {
2008 struct relay_connection
*conn
;
2010 ret
= lttng_read(live_conn_pipe
[0],
2011 &conn
, sizeof(conn
));
2015 lttng_poll_add(&events
, conn
->sock
->fd
,
2016 LPOLLIN
| LPOLLRDHUP
);
2017 connection_ht_add(viewer_connections_ht
, conn
);
2018 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
2019 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2020 ERR("Relay live pipe error");
2023 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2027 /* Connection activity. */
2028 struct relay_connection
*conn
;
2030 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
2035 if (revents
& LPOLLIN
) {
2036 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
2037 sizeof(recv_hdr
), 0);
2039 /* Connection closed. */
2040 cleanup_connection_pollfd(&events
, pollfd
);
2041 /* Put "create" ownership reference. */
2042 connection_put(conn
);
2043 DBG("Viewer control conn closed with %d", pollfd
);
2045 ret
= process_control(&recv_hdr
, conn
);
2047 /* Clear the session on error. */
2048 cleanup_connection_pollfd(&events
, pollfd
);
2049 /* Put "create" ownership reference. */
2050 connection_put(conn
);
2051 DBG("Viewer connection closed with %d", pollfd
);
2054 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2055 cleanup_connection_pollfd(&events
, pollfd
);
2056 /* Put "create" ownership reference. */
2057 connection_put(conn
);
2059 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2060 connection_put(conn
);
2063 /* Put local "get_by_sock" reference. */
2064 connection_put(conn
);
2071 lttng_poll_clean(&events
);
2073 /* Cleanup reamaining connection object. */
2075 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
2078 health_code_update();
2079 connection_put(destroy_conn
);
2083 lttng_ht_destroy(viewer_connections_ht
);
2084 viewer_connections_ht_error
:
2085 /* Close relay conn pipes */
2086 utils_close_pipe(live_conn_pipe
);
2088 DBG("Viewer worker thread exited with error");
2090 DBG("Viewer worker thread cleanup complete");
2094 ERR("Health error occurred in %s", __func__
);
2096 health_unregister(health_relayd
);
2097 if (lttng_relay_stop_threads()) {
2098 ERR("Error stopping threads");
2100 rcu_unregister_thread();
2105 * Create the relay command pipe to wake thread_manage_apps.
2106 * Closed in cleanup().
2108 static int create_conn_pipe(void)
2110 return utils_create_pipe_cloexec(live_conn_pipe
);
2113 int relayd_live_join(void)
2115 int ret
, retval
= 0;
2118 ret
= pthread_join(live_listener_thread
, &status
);
2121 PERROR("pthread_join live listener");
2125 ret
= pthread_join(live_worker_thread
, &status
);
2128 PERROR("pthread_join live worker");
2132 ret
= pthread_join(live_dispatcher_thread
, &status
);
2135 PERROR("pthread_join live dispatcher");
2139 cleanup_relayd_live();
2147 int relayd_live_create(struct lttng_uri
*uri
)
2149 int ret
= 0, retval
= 0;
2155 goto exit_init_data
;
2159 /* Check if daemon is UID = 0 */
2160 is_root
= !getuid();
2163 if (live_uri
->port
< 1024) {
2164 ERR("Need to be root to use ports < 1024");
2166 goto exit_init_data
;
2170 /* Setup the thread apps communication pipe. */
2171 if (create_conn_pipe()) {
2173 goto exit_init_data
;
2176 /* Init relay command queue. */
2177 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2179 /* Set up max poll set size */
2180 if (lttng_poll_set_max_size()) {
2182 goto exit_init_data
;
2185 /* Setup the dispatcher thread */
2186 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2187 thread_dispatcher
, (void *) NULL
);
2190 PERROR("pthread_create viewer dispatcher");
2192 goto exit_dispatcher_thread
;
2195 /* Setup the worker thread */
2196 ret
= pthread_create(&live_worker_thread
, NULL
,
2197 thread_worker
, NULL
);
2200 PERROR("pthread_create viewer worker");
2202 goto exit_worker_thread
;
2205 /* Setup the listener thread */
2206 ret
= pthread_create(&live_listener_thread
, NULL
,
2207 thread_listener
, (void *) NULL
);
2210 PERROR("pthread_create viewer listener");
2212 goto exit_listener_thread
;
2216 * All OK, started all threads.
2221 * Join on the live_listener_thread should anything be added after
2222 * the live_listener thread's creation.
2225 exit_listener_thread
:
2227 ret
= pthread_join(live_worker_thread
, &status
);
2230 PERROR("pthread_join live worker");
2235 ret
= pthread_join(live_dispatcher_thread
, &status
);
2238 PERROR("pthread_join live dispatcher");
2241 exit_dispatcher_thread
:
2244 cleanup_relayd_live();