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>
56 #include <common/fd-tracker/utils.h>
60 #include "lttng-relayd.h"
62 #include "health-relayd.h"
63 #include "testpoint.h"
64 #include "viewer-stream.h"
67 #include "ctf-trace.h"
68 #include "connection.h"
69 #include "viewer-session.h"
71 #define SESSION_BUF_DEFAULT_COUNT 16
73 static struct lttng_uri
*live_uri
;
76 * This pipe is used to inform the worker thread that a command is queued and
77 * ready to be processed.
79 static int live_conn_pipe
[2] = { -1, -1 };
81 /* Shared between threads */
82 static int live_dispatch_thread_exit
;
84 static pthread_t live_listener_thread
;
85 static pthread_t live_dispatcher_thread
;
86 static pthread_t live_worker_thread
;
89 * Relay command queue.
91 * The live_thread_listener and live_thread_dispatcher communicate with this
94 static struct relay_conn_queue viewer_conn_queue
;
96 static uint64_t last_relay_viewer_session_id
;
97 static pthread_mutex_t last_relay_viewer_session_id_lock
=
98 PTHREAD_MUTEX_INITIALIZER
;
104 void cleanup_relayd_live(void)
112 * Receive a request buffer using a given socket, destination allocated buffer
115 * Return the size of the received message or else a negative value on error
116 * with errno being set by recvmsg() syscall.
119 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
123 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
124 if (ret
< 0 || ret
!= size
) {
126 /* Orderly shutdown. Not necessary to print an error. */
127 DBG("Socket %d did an orderly shutdown", sock
->fd
);
129 ERR("Relay failed to receive request.");
138 * Send a response buffer using a given socket, source allocated buffer of
141 * Return the size of the sent message or else a negative value on error with
142 * errno being set by sendmsg() syscall.
145 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
149 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
151 ERR("Relayd failed to send response.");
158 * Atomically check if new streams got added in one of the sessions attached
159 * and reset the flag to 0.
161 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
165 int check_new_streams(struct relay_connection
*conn
)
167 struct relay_session
*session
;
168 unsigned long current_val
;
171 if (!conn
->viewer_session
) {
175 cds_list_for_each_entry_rcu(session
,
176 &conn
->viewer_session
->session_list
,
177 viewer_session_node
) {
178 if (!session_get(session
)) {
181 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
183 session_put(session
);
194 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
195 * this function should ignore the sent flag or not.
197 * Return 0 on success or else a negative value.
200 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
201 struct relay_session
*session
, unsigned int ignore_sent_flag
)
204 struct lttng_viewer_stream send_stream
;
205 struct lttng_ht_iter iter
;
206 struct relay_viewer_stream
*vstream
;
210 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
212 struct ctf_trace
*ctf_trace
;
214 health_code_update();
216 if (!viewer_stream_get(vstream
)) {
220 pthread_mutex_lock(&vstream
->stream
->lock
);
221 /* Ignore if not the same session. */
222 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
223 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
224 pthread_mutex_unlock(&vstream
->stream
->lock
);
225 viewer_stream_put(vstream
);
229 ctf_trace
= vstream
->stream
->trace
;
230 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
231 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
232 send_stream
.metadata_flag
= htobe32(
233 vstream
->stream
->is_metadata
);
234 if (lttng_strncpy(send_stream
.path_name
, vstream
->path_name
,
235 sizeof(send_stream
.path_name
))) {
236 pthread_mutex_unlock(&vstream
->stream
->lock
);
237 viewer_stream_put(vstream
);
238 ret
= -1; /* Error. */
241 if (lttng_strncpy(send_stream
.channel_name
,
242 vstream
->channel_name
,
243 sizeof(send_stream
.channel_name
))) {
244 pthread_mutex_unlock(&vstream
->stream
->lock
);
245 viewer_stream_put(vstream
);
246 ret
= -1; /* Error. */
250 DBG("Sending stream %" PRIu64
" to viewer",
251 vstream
->stream
->stream_handle
);
252 vstream
->sent_flag
= 1;
253 pthread_mutex_unlock(&vstream
->stream
->lock
);
255 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
256 viewer_stream_put(vstream
);
270 * Create every viewer stream possible for the given session with the seek
271 * type. Three counters *can* be return which are in order the total amount of
272 * viewer stream of the session, the number of unsent stream and the number of
273 * stream created. Those counters can be NULL and thus will be ignored.
275 * Return 0 on success or else a negative value.
278 int make_viewer_streams(struct relay_session
*session
,
279 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
280 uint32_t *nb_created
, bool *closed
)
283 struct lttng_ht_iter iter
;
284 struct ctf_trace
*ctf_trace
;
289 * Hold the session lock to ensure that we see either none or
290 * all initial streams for a session, but no intermediate state.
292 pthread_mutex_lock(&session
->lock
);
294 if (session
->connection_closed
) {
299 * Create viewer streams for relay streams that are ready to be
300 * used for a the given session id only.
303 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
305 struct relay_stream
*stream
;
307 health_code_update();
309 if (!ctf_trace_get(ctf_trace
)) {
313 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
314 struct relay_viewer_stream
*vstream
;
316 if (!stream_get(stream
)) {
320 * stream published is protected by the session lock.
322 if (!stream
->published
) {
325 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
327 vstream
= viewer_stream_create(stream
, seek_t
);
330 ctf_trace_put(ctf_trace
);
336 /* Update number of created stream counter. */
340 * Ensure a self-reference is preserved even
341 * after we have put our local reference.
343 if (!viewer_stream_get(vstream
)) {
344 ERR("Unable to get self-reference on viewer stream, logic error.");
348 if (!vstream
->sent_flag
&& nb_unsent
) {
349 /* Update number of unsent stream counter. */
353 /* Update number of total stream counter. */
355 if (stream
->is_metadata
) {
356 if (!stream
->closed
||
357 stream
->metadata_received
> vstream
->metadata_sent
) {
361 if (!stream
->closed
||
362 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
368 /* Put local reference. */
369 viewer_stream_put(vstream
);
373 ctf_trace_put(ctf_trace
);
380 pthread_mutex_unlock(&session
->lock
);
384 int relayd_live_stop(void)
386 /* Stop dispatch thread */
387 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
388 futex_nto1_wake(&viewer_conn_queue
.futex
);
393 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
396 int create_named_thread_poll_set(struct lttng_poll_event
*events
,
397 int size
, const char *name
)
401 if (events
== NULL
|| size
== 0) {
406 ret
= fd_tracker_util_poll_create(the_fd_tracker
,
407 name
, events
, 1, LTTNG_CLOEXEC
);
410 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
422 * Check if the thread quit pipe was triggered.
424 * Return 1 if it was triggered else 0;
427 int check_thread_quit_pipe(int fd
, uint32_t events
)
429 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
437 * Create and init socket from uri.
440 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
443 struct lttcomm_sock
*sock
= NULL
;
445 sock
= lttcomm_alloc_sock_from_uri(uri
);
447 ERR("Allocating socket");
451 ret
= lttcomm_create_sock(sock
);
455 DBG("Listening on sock %d for lttng-live", sock
->fd
);
457 ret
= sock
->ops
->bind(sock
);
459 PERROR("Failed to bind lttng-live socket");
463 ret
= sock
->ops
->listen(sock
, -1);
473 lttcomm_destroy_sock(sock
);
479 * This thread manages the listening for new connections on the network
482 void *thread_listener(void *data
)
484 int i
, ret
, pollfd
, err
= -1;
485 uint32_t revents
, nb_fd
;
486 struct lttng_poll_event events
;
487 struct lttcomm_sock
*live_control_sock
;
489 DBG("[thread] Relay live listener started");
491 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
493 health_code_update();
495 live_control_sock
= init_socket(live_uri
);
496 if (!live_control_sock
) {
497 goto error_sock_control
;
500 /* Pass 2 as size here for the thread quit pipe and control sockets. */
501 ret
= create_named_thread_poll_set(&events
, 2,
502 "Live listener thread epoll");
504 goto error_create_poll
;
507 /* Add the control socket */
508 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
513 lttng_relay_notify_ready();
515 if (testpoint(relayd_thread_live_listener
)) {
516 goto error_testpoint
;
520 health_code_update();
522 DBG("Listener accepting live viewers connections");
526 ret
= lttng_poll_wait(&events
, -1);
530 * Restart interrupted system call.
532 if (errno
== EINTR
) {
539 DBG("Relay new viewer connection received");
540 for (i
= 0; i
< nb_fd
; i
++) {
541 health_code_update();
543 /* Fetch once the poll data */
544 revents
= LTTNG_POLL_GETEV(&events
, i
);
545 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
548 /* No activity for this FD (poll implementation). */
552 /* Thread quit pipe has been closed. Killing thread. */
553 ret
= check_thread_quit_pipe(pollfd
, revents
);
559 if (revents
& LPOLLIN
) {
561 * A new connection is requested, therefore a
562 * viewer connection is allocated in this
563 * thread, enqueued to a global queue and
564 * dequeued (and freed) in the worker thread.
567 struct relay_connection
*new_conn
;
568 struct lttcomm_sock
*newsock
;
570 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
572 PERROR("accepting control sock");
575 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
577 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
580 PERROR("setsockopt inet");
581 lttcomm_destroy_sock(newsock
);
584 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
586 lttcomm_destroy_sock(newsock
);
589 /* Ownership assumed by the connection. */
592 /* Enqueue request for the dispatcher thread. */
593 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
597 * Wake the dispatch queue futex.
598 * Implicit memory barrier with the
599 * exchange in cds_wfcq_enqueue.
601 futex_nto1_wake(&viewer_conn_queue
.futex
);
602 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
603 ERR("socket poll error");
606 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
616 (void) fd_tracker_util_poll_clean(the_fd_tracker
, &events
);
618 if (live_control_sock
->fd
>= 0) {
619 ret
= live_control_sock
->ops
->close(live_control_sock
);
624 lttcomm_destroy_sock(live_control_sock
);
628 DBG("Live viewer listener thread exited with error");
630 health_unregister(health_relayd
);
631 DBG("Live viewer listener thread cleanup complete");
632 if (lttng_relay_stop_threads()) {
633 ERR("Error stopping threads");
639 * This thread manages the dispatching of the requests to worker threads
642 void *thread_dispatcher(void *data
)
646 struct cds_wfcq_node
*node
;
647 struct relay_connection
*conn
= NULL
;
649 DBG("[thread] Live viewer relay dispatcher started");
651 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
653 if (testpoint(relayd_thread_live_dispatcher
)) {
654 goto error_testpoint
;
657 health_code_update();
660 health_code_update();
662 /* Atomically prepare the queue futex */
663 futex_nto1_prepare(&viewer_conn_queue
.futex
);
665 if (CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
670 health_code_update();
672 /* Dequeue commands */
673 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
674 &viewer_conn_queue
.tail
);
676 DBG("Woken up but nothing in the live-viewer "
677 "relay command queue");
678 /* Continue thread execution */
681 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
682 DBG("Dispatching viewer request waiting on sock %d",
686 * Inform worker thread of the new request. This
687 * call is blocking so we can be assured that
688 * the data will be read at some point in time
689 * or wait to the end of the world :)
691 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
693 PERROR("write conn pipe");
694 connection_put(conn
);
697 } while (node
!= NULL
);
699 /* Futex wait on queue. Blocking call on futex() */
701 futex_nto1_wait(&viewer_conn_queue
.futex
);
705 /* Normal exit, no error */
712 ERR("Health error occurred in %s", __func__
);
714 health_unregister(health_relayd
);
715 DBG("Live viewer dispatch thread dying");
716 if (lttng_relay_stop_threads()) {
717 ERR("Error stopping threads");
723 * Establish connection with the viewer and check the versions.
725 * Return 0 on success or else negative value.
728 int viewer_connect(struct relay_connection
*conn
)
731 struct lttng_viewer_connect reply
, msg
;
733 conn
->version_check_done
= 1;
735 health_code_update();
737 DBG("Viewer is establishing a connection to the relayd.");
739 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
744 health_code_update();
746 memset(&reply
, 0, sizeof(reply
));
747 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
748 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
750 /* Major versions must be the same */
751 if (reply
.major
!= be32toh(msg
.major
)) {
752 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
753 reply
.major
, be32toh(msg
.major
));
758 conn
->major
= reply
.major
;
759 /* We adapt to the lowest compatible version */
760 if (reply
.minor
<= be32toh(msg
.minor
)) {
761 conn
->minor
= reply
.minor
;
763 conn
->minor
= be32toh(msg
.minor
);
766 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
767 conn
->type
= RELAY_VIEWER_COMMAND
;
768 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
769 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
771 ERR("Unknown connection type : %u", be32toh(msg
.type
));
776 reply
.major
= htobe32(reply
.major
);
777 reply
.minor
= htobe32(reply
.minor
);
778 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
780 * Increment outside of htobe64 macro, because the argument can
781 * be used more than once within the macro, and thus the
782 * operation may be undefined.
784 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
785 last_relay_viewer_session_id
++;
786 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
787 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
790 health_code_update();
792 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
797 health_code_update();
799 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
807 * Send the viewer the list of current sessions.
808 * We need to create a copy of the hash table content because otherwise
809 * we cannot assume the number of entries stays the same between getting
810 * the number of HT elements and iteration over the HT.
812 * Return 0 on success or else a negative value.
815 int viewer_list_sessions(struct relay_connection
*conn
)
818 struct lttng_viewer_list_sessions session_list
;
819 struct lttng_ht_iter iter
;
820 struct relay_session
*session
;
821 struct lttng_viewer_session
*send_session_buf
= NULL
;
822 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
825 DBG("List sessions received");
827 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
828 if (!send_session_buf
) {
833 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
835 struct lttng_viewer_session
*send_session
;
837 health_code_update();
839 if (count
>= buf_count
) {
840 struct lttng_viewer_session
*newbuf
;
841 uint32_t new_buf_count
= buf_count
<< 1;
843 newbuf
= realloc(send_session_buf
,
844 new_buf_count
* sizeof(*send_session_buf
));
849 send_session_buf
= newbuf
;
850 buf_count
= new_buf_count
;
852 send_session
= &send_session_buf
[count
];
853 if (lttng_strncpy(send_session
->session_name
,
854 session
->session_name
,
855 sizeof(send_session
->session_name
))) {
859 if (lttng_strncpy(send_session
->hostname
, session
->hostname
,
860 sizeof(send_session
->hostname
))) {
864 send_session
->id
= htobe64(session
->id
);
865 send_session
->live_timer
= htobe32(session
->live_timer
);
866 if (session
->viewer_attached
) {
867 send_session
->clients
= htobe32(1);
869 send_session
->clients
= htobe32(0);
871 send_session
->streams
= htobe32(session
->stream_count
);
879 session_list
.sessions_count
= htobe32(count
);
881 health_code_update();
883 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
888 health_code_update();
890 ret
= send_response(conn
->sock
, send_session_buf
,
891 count
* sizeof(*send_session_buf
));
895 health_code_update();
899 free(send_session_buf
);
904 * Send the viewer the list of current streams.
907 int viewer_get_new_streams(struct relay_connection
*conn
)
909 int ret
, send_streams
= 0;
910 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
911 struct lttng_viewer_new_streams_request request
;
912 struct lttng_viewer_new_streams_response response
;
913 struct relay_session
*session
;
919 DBG("Get new streams received");
921 health_code_update();
923 /* Receive the request from the connected client. */
924 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
928 session_id
= be64toh(request
.session_id
);
930 health_code_update();
932 memset(&response
, 0, sizeof(response
));
934 session
= session_get_by_id(session_id
);
936 DBG("Relay session %" PRIu64
" not found", session_id
);
937 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
941 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
943 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
948 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
950 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
951 &nb_created
, &closed
);
953 goto end_put_session
;
955 /* Only send back the newly created streams with the unsent ones. */
956 nb_streams
= nb_created
+ nb_unsent
;
957 response
.streams_count
= htobe32(nb_streams
);
960 * If the session is closed, HUP when there are no more streams
963 if (closed
&& nb_total
== 0) {
965 response
.streams_count
= 0;
966 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
971 health_code_update();
972 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
974 goto end_put_session
;
976 health_code_update();
979 * Unknown or empty session, just return gracefully, the viewer
980 * knows what is happening.
982 if (!send_streams
|| !nb_streams
) {
984 goto end_put_session
;
988 * Send stream and *DON'T* ignore the sent flag so every viewer
989 * streams that were not sent from that point will be sent to
992 ret
= send_viewer_streams(conn
->sock
, session
, 0);
994 goto end_put_session
;
999 session_put(session
);
1006 * Send the viewer the list of current sessions.
1009 int viewer_attach_session(struct relay_connection
*conn
)
1011 int send_streams
= 0;
1013 uint32_t nb_streams
= 0;
1014 enum lttng_viewer_seek seek_type
;
1015 struct lttng_viewer_attach_session_request request
;
1016 struct lttng_viewer_attach_session_response response
;
1017 struct relay_session
*session
= NULL
;
1018 bool closed
= false;
1022 health_code_update();
1024 /* Receive the request from the connected client. */
1025 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1030 health_code_update();
1032 memset(&response
, 0, sizeof(response
));
1034 if (!conn
->viewer_session
) {
1035 DBG("Client trying to attach before creating a live viewer session");
1036 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1040 session
= session_get_by_id(be64toh(request
.session_id
));
1042 DBG("Relay session %" PRIu64
" not found",
1043 (uint64_t) be64toh(request
.session_id
));
1044 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1047 DBG("Attach session ID %" PRIu64
" received",
1048 (uint64_t) be64toh(request
.session_id
));
1050 if (session
->live_timer
== 0) {
1051 DBG("Not live session");
1052 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1057 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1059 DBG("Already a viewer attached");
1060 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1064 switch (be32toh(request
.seek
)) {
1065 case LTTNG_VIEWER_SEEK_BEGINNING
:
1066 case LTTNG_VIEWER_SEEK_LAST
:
1067 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1068 seek_type
= be32toh(request
.seek
);
1071 ERR("Wrong seek parameter");
1072 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1077 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1080 goto end_put_session
;
1082 response
.streams_count
= htobe32(nb_streams
);
1085 * If the session is closed when the viewer is attaching, it
1086 * means some of the streams may have been concurrently removed,
1087 * so we don't allow the viewer to attach, even if there are
1088 * streams available.
1092 response
.streams_count
= 0;
1093 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1098 health_code_update();
1099 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1101 goto end_put_session
;
1103 health_code_update();
1106 * Unknown or empty session, just return gracefully, the viewer
1107 * knows what is happening.
1109 if (!send_streams
|| !nb_streams
) {
1111 goto end_put_session
;
1114 /* Send stream and ignore the sent flag. */
1115 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1117 goto end_put_session
;
1122 session_put(session
);
1129 * Open the index file if needed for the given vstream.
1131 * If an index file is successfully opened, the vstream will set it as its
1132 * current index file.
1134 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1136 * Called with rstream lock held.
1138 static int try_open_index(struct relay_viewer_stream
*vstream
,
1139 struct relay_stream
*rstream
)
1143 if (vstream
->index_file
) {
1148 * First time, we open the index file and at least one index is ready.
1150 if (rstream
->index_received_seqcount
== 0) {
1154 vstream
->index_file
= lttng_index_file_open(vstream
->path_name
,
1155 vstream
->channel_name
,
1156 vstream
->stream
->tracefile_count
,
1157 vstream
->current_tracefile_id
);
1158 if (!vstream
->index_file
) {
1167 * Check the status of the index for the given stream. This function
1168 * updates the index structure if needed and can put (close) the vstream
1169 * in the HUP situation.
1171 * Return 0 means that we can proceed with the index. A value of 1 means
1172 * that the index has been updated and is ready to be sent to the
1173 * client. A negative value indicates an error that can't be handled.
1175 * Called with rstream lock held.
1177 static int check_index_status(struct relay_viewer_stream
*vstream
,
1178 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1179 struct lttng_viewer_index
*index
)
1183 if ((trace
->session
->connection_closed
|| rstream
->closed
)
1184 && rstream
->index_received_seqcount
1185 == vstream
->index_sent_seqcount
) {
1187 * Last index sent and session connection or relay
1188 * stream are closed.
1190 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1192 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1193 rstream
->index_received_seqcount
1194 == vstream
->index_sent_seqcount
) {
1196 * We've received a synchronization beacon and the last index
1197 * available has been sent, the index for now is inactive.
1199 * In this case, we have received a beacon which allows us to
1200 * inform the client of a time interval during which we can
1201 * guarantee that there are no events to read (and never will
1204 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1205 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1206 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1208 } else if (rstream
->index_received_seqcount
1209 == vstream
->index_sent_seqcount
) {
1211 * This checks whether received == sent seqcount. In
1212 * this case, we have not received a beacon. Therefore,
1213 * we can only ask the client to retry later.
1215 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1217 } else if (!tracefile_array_seq_in_file(rstream
->tfa
,
1218 vstream
->current_tracefile_id
,
1219 vstream
->index_sent_seqcount
)) {
1221 * The next index we want to send cannot be read either
1222 * because we need to perform a rotation, or due to
1223 * the producer having overwritten its trace file.
1225 DBG("Viewer stream %" PRIu64
" rotation",
1226 vstream
->stream
->stream_handle
);
1227 ret
= viewer_stream_rotate(vstream
);
1230 } else if (ret
== 1) {
1231 /* EOF across entire stream. */
1232 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1236 * If we have been pushed due to overwrite, it
1237 * necessarily means there is data that can be read in
1238 * the stream. If we rotated because we reached the end
1239 * of a tracefile, it means the following tracefile
1240 * needs to contain at least one index, else we would
1241 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1242 * viewer. The updated index_sent_seqcount needs to
1243 * point to a readable index entry now.
1245 * In the case where we "rotate" on a single file, we
1246 * can end up in a case where the requested index is
1247 * still unavailable.
1249 if (rstream
->tracefile_count
== 1 &&
1250 !tracefile_array_seq_in_file(
1252 vstream
->current_tracefile_id
,
1253 vstream
->index_sent_seqcount
)) {
1254 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1257 assert(tracefile_array_seq_in_file(rstream
->tfa
,
1258 vstream
->current_tracefile_id
,
1259 vstream
->index_sent_seqcount
));
1261 /* ret == 0 means successful so we continue. */
1267 viewer_stream_put(vstream
);
1273 * Send the next index for a stream.
1275 * Return 0 on success or else a negative value.
1278 int viewer_get_next_index(struct relay_connection
*conn
)
1281 struct lttng_viewer_get_next_index request_index
;
1282 struct lttng_viewer_index viewer_index
;
1283 struct ctf_packet_index packet_index
;
1284 struct relay_viewer_stream
*vstream
= NULL
;
1285 struct relay_stream
*rstream
= NULL
;
1286 struct ctf_trace
*ctf_trace
= NULL
;
1287 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1291 DBG("Viewer get next index");
1293 memset(&viewer_index
, 0, sizeof(viewer_index
));
1294 health_code_update();
1296 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1300 health_code_update();
1302 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1304 DBG("Client requested index of unknown stream id %" PRIu64
,
1305 (uint64_t) be64toh(request_index
.stream_id
));
1306 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1310 /* Use back. ref. Protected by refcounts. */
1311 rstream
= vstream
->stream
;
1312 ctf_trace
= rstream
->trace
;
1314 /* metadata_viewer_stream may be NULL. */
1315 metadata_viewer_stream
=
1316 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1318 pthread_mutex_lock(&rstream
->lock
);
1321 * The viewer should not ask for index on metadata stream.
1323 if (rstream
->is_metadata
) {
1324 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1328 /* Try to open an index if one is needed for that stream. */
1329 ret
= try_open_index(vstream
, rstream
);
1331 if (ret
== -ENOENT
) {
1333 * The index is created only when the first data
1334 * packet arrives, it might not be ready at the
1335 * beginning of the session
1337 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1339 /* Unhandled error. */
1340 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1345 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1348 } else if (ret
== 1) {
1350 * We have no index to send and check_index_status has populated
1351 * viewer_index's status.
1355 /* At this point, ret is 0 thus we will be able to read the index. */
1359 * vstream->stream_fd may be NULL if it has been closed by
1360 * tracefile rotation, or if we are at the beginning of the
1361 * stream. We open the data stream file here to protect against
1362 * overwrite caused by tracefile rotation (in association with
1363 * unlink performed before overwrite).
1365 if (!vstream
->stream_fd
) {
1366 char fullpath
[PATH_MAX
];
1368 if (vstream
->stream
->tracefile_count
> 0) {
1369 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1371 vstream
->channel_name
,
1372 vstream
->current_tracefile_id
);
1374 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1376 vstream
->channel_name
);
1381 ret
= open(fullpath
, O_RDONLY
);
1383 PERROR("Relay opening trace file");
1386 vstream
->stream_fd
= stream_fd_create(ret
);
1387 if (!vstream
->stream_fd
) {
1395 ret
= check_new_streams(conn
);
1397 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1399 } else if (ret
== 1) {
1400 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1403 ret
= lttng_index_file_read(vstream
->index_file
, &packet_index
);
1405 ERR("Relay error reading index file %d",
1406 vstream
->index_file
->fd
);
1407 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1410 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1411 vstream
->index_sent_seqcount
++;
1415 * Indexes are stored in big endian, no need to switch before sending.
1417 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1418 rstream
->stream_handle
,
1419 (uint64_t) be64toh(packet_index
.offset
));
1420 viewer_index
.offset
= packet_index
.offset
;
1421 viewer_index
.packet_size
= packet_index
.packet_size
;
1422 viewer_index
.content_size
= packet_index
.content_size
;
1423 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1424 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1425 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1426 viewer_index
.stream_id
= packet_index
.stream_id
;
1430 pthread_mutex_unlock(&rstream
->lock
);
1433 if (metadata_viewer_stream
) {
1434 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1435 DBG("get next index metadata check: recv %" PRIu64
1437 metadata_viewer_stream
->stream
->metadata_received
,
1438 metadata_viewer_stream
->metadata_sent
);
1439 if (!metadata_viewer_stream
->stream
->metadata_received
||
1440 metadata_viewer_stream
->stream
->metadata_received
>
1441 metadata_viewer_stream
->metadata_sent
) {
1442 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1444 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1447 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1448 health_code_update();
1450 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1454 health_code_update();
1457 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1458 vstream
->index_sent_seqcount
,
1459 vstream
->stream
->stream_handle
);
1462 if (metadata_viewer_stream
) {
1463 viewer_stream_put(metadata_viewer_stream
);
1466 viewer_stream_put(vstream
);
1471 pthread_mutex_unlock(&rstream
->lock
);
1472 if (metadata_viewer_stream
) {
1473 viewer_stream_put(metadata_viewer_stream
);
1475 viewer_stream_put(vstream
);
1480 * Send the next index for a stream
1482 * Return 0 on success or else a negative value.
1485 int viewer_get_packet(struct relay_connection
*conn
)
1490 struct lttng_viewer_get_packet get_packet_info
;
1491 struct lttng_viewer_trace_packet reply_header
;
1492 struct relay_viewer_stream
*vstream
= NULL
;
1493 uint32_t reply_size
= sizeof(reply_header
);
1494 uint32_t packet_data_len
= 0;
1497 DBG2("Relay get data packet");
1499 health_code_update();
1501 ret
= recv_request(conn
->sock
, &get_packet_info
,
1502 sizeof(get_packet_info
));
1506 health_code_update();
1508 /* From this point on, the error label can be reached. */
1509 memset(&reply_header
, 0, sizeof(reply_header
));
1511 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1513 DBG("Client requested packet of unknown stream id %" PRIu64
,
1514 (uint64_t) be64toh(get_packet_info
.stream_id
));
1515 reply_header
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1516 goto send_reply_nolock
;
1518 packet_data_len
= be32toh(get_packet_info
.len
);
1519 reply_size
+= packet_data_len
;
1522 reply
= zmalloc(reply_size
);
1524 PERROR("packet reply zmalloc");
1525 reply_size
= sizeof(reply_header
);
1529 pthread_mutex_lock(&vstream
->stream
->lock
);
1530 lseek_ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1532 if (lseek_ret
< 0) {
1533 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1534 (uint64_t) be64toh(get_packet_info
.offset
));
1537 read_len
= lttng_read(vstream
->stream_fd
->fd
,
1538 reply
+ sizeof(reply_header
),
1540 if (read_len
< packet_data_len
) {
1541 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1542 vstream
->stream_fd
->fd
,
1543 (uint64_t) be64toh(get_packet_info
.offset
));
1546 reply_header
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1547 reply_header
.len
= htobe32(packet_data_len
);
1551 reply_header
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1555 pthread_mutex_unlock(&vstream
->stream
->lock
);
1559 health_code_update();
1562 memcpy(reply
, &reply_header
, sizeof(reply_header
));
1563 ret
= send_response(conn
->sock
, reply
, reply_size
);
1565 /* No reply to send. */
1566 ret
= send_response(conn
->sock
, &reply_header
,
1570 health_code_update();
1572 PERROR("sendmsg of packet data failed");
1576 DBG("Sent %u bytes for stream %" PRIu64
, reply_size
,
1577 (uint64_t) be64toh(get_packet_info
.stream_id
));
1583 viewer_stream_put(vstream
);
1589 * Send the session's metadata
1591 * Return 0 on success else a negative value.
1594 int viewer_get_metadata(struct relay_connection
*conn
)
1600 struct lttng_viewer_get_metadata request
;
1601 struct lttng_viewer_metadata_packet reply
;
1602 struct relay_viewer_stream
*vstream
= NULL
;
1606 DBG("Relay get metadata");
1608 health_code_update();
1610 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1614 health_code_update();
1616 memset(&reply
, 0, sizeof(reply
));
1618 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1621 * The metadata stream can be closed by a CLOSE command
1622 * just before we attach. It can also be closed by
1623 * per-pid tracing during tracing. Therefore, it is
1624 * possible that we cannot find this viewer stream.
1625 * Reply back to the client with an error if we cannot
1628 DBG("Client requested metadata of unknown stream id %" PRIu64
,
1629 (uint64_t) be64toh(request
.stream_id
));
1630 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1633 pthread_mutex_lock(&vstream
->stream
->lock
);
1634 if (!vstream
->stream
->is_metadata
) {
1635 ERR("Invalid metadata stream");
1639 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1641 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1643 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1647 /* first time, we open the metadata file */
1648 if (!vstream
->stream_fd
) {
1649 char fullpath
[PATH_MAX
];
1651 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1652 vstream
->channel_name
);
1656 ret
= open(fullpath
, O_RDONLY
);
1658 PERROR("Relay opening metadata file");
1661 vstream
->stream_fd
= stream_fd_create(ret
);
1662 if (!vstream
->stream_fd
) {
1670 reply
.len
= htobe64(len
);
1671 data
= zmalloc(len
);
1673 PERROR("viewer metadata zmalloc");
1677 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1678 if (read_len
< len
) {
1679 PERROR("Relay reading metadata file");
1682 vstream
->metadata_sent
+= read_len
;
1683 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1684 && vstream
->stream
->closed
) {
1685 /* Release ownership for the viewer metadata stream. */
1686 viewer_stream_put(vstream
);
1689 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1694 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1697 health_code_update();
1699 pthread_mutex_unlock(&vstream
->stream
->lock
);
1701 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1705 health_code_update();
1708 ret
= send_response(conn
->sock
, data
, len
);
1714 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1715 (uint64_t) be64toh(request
.stream_id
));
1717 DBG("Metadata sent");
1723 viewer_stream_put(vstream
);
1729 * Create a viewer session.
1731 * Return 0 on success or else a negative value.
1734 int viewer_create_session(struct relay_connection
*conn
)
1737 struct lttng_viewer_create_session_response resp
;
1739 DBG("Viewer create session received");
1741 memset(&resp
, 0, sizeof(resp
));
1742 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1743 conn
->viewer_session
= viewer_session_create();
1744 if (!conn
->viewer_session
) {
1745 ERR("Allocation viewer session");
1746 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1751 health_code_update();
1752 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1756 health_code_update();
1764 * Detach a viewer session.
1766 * Return 0 on success or else a negative value.
1769 int viewer_detach_session(struct relay_connection
*conn
)
1772 struct lttng_viewer_detach_session_response response
;
1773 struct lttng_viewer_detach_session_request request
;
1774 struct relay_session
*session
= NULL
;
1775 uint64_t viewer_session_to_close
;
1777 DBG("Viewer detach session received");
1781 health_code_update();
1783 /* Receive the request from the connected client. */
1784 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1788 viewer_session_to_close
= be64toh(request
.session_id
);
1790 if (!conn
->viewer_session
) {
1791 DBG("Client trying to detach before creating a live viewer session");
1792 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR
);
1796 health_code_update();
1798 memset(&response
, 0, sizeof(response
));
1799 DBG("Detaching from session ID %" PRIu64
, viewer_session_to_close
);
1801 session
= session_get_by_id(be64toh(request
.session_id
));
1803 DBG("Relay session %" PRIu64
" not found",
1804 (uint64_t) be64toh(request
.session_id
));
1805 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK
);
1809 ret
= viewer_session_is_attached(conn
->viewer_session
, session
);
1811 DBG("Not attached to this session");
1812 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR
);
1813 goto send_reply_put
;
1816 viewer_session_close_one_session(conn
->viewer_session
, session
);
1817 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_OK
);
1818 DBG("Session %" PRIu64
" detached.", viewer_session_to_close
);
1821 session_put(session
);
1824 health_code_update();
1825 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1829 health_code_update();
1837 * live_relay_unknown_command: send -1 if received unknown command
1840 void live_relay_unknown_command(struct relay_connection
*conn
)
1842 struct lttcomm_relayd_generic_reply reply
;
1844 memset(&reply
, 0, sizeof(reply
));
1845 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1846 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1850 * Process the commands received on the control socket
1853 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1854 struct relay_connection
*conn
)
1859 msg_value
= be32toh(recv_hdr
->cmd
);
1862 * Make sure we've done the version check before any command other then a
1863 * new client connection.
1865 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1866 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1871 switch (msg_value
) {
1872 case LTTNG_VIEWER_CONNECT
:
1873 ret
= viewer_connect(conn
);
1875 case LTTNG_VIEWER_LIST_SESSIONS
:
1876 ret
= viewer_list_sessions(conn
);
1878 case LTTNG_VIEWER_ATTACH_SESSION
:
1879 ret
= viewer_attach_session(conn
);
1881 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1882 ret
= viewer_get_next_index(conn
);
1884 case LTTNG_VIEWER_GET_PACKET
:
1885 ret
= viewer_get_packet(conn
);
1887 case LTTNG_VIEWER_GET_METADATA
:
1888 ret
= viewer_get_metadata(conn
);
1890 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1891 ret
= viewer_get_new_streams(conn
);
1893 case LTTNG_VIEWER_CREATE_SESSION
:
1894 ret
= viewer_create_session(conn
);
1896 case LTTNG_VIEWER_DETACH_SESSION
:
1897 ret
= viewer_detach_session(conn
);
1900 ERR("Received unknown viewer command (%u)",
1901 be32toh(recv_hdr
->cmd
));
1902 live_relay_unknown_command(conn
);
1912 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1916 (void) lttng_poll_del(events
, pollfd
);
1918 ret
= close(pollfd
);
1920 ERR("Closing pollfd %d", pollfd
);
1925 * This thread does the actual work
1928 void *thread_worker(void *data
)
1932 struct lttng_poll_event events
;
1933 struct lttng_ht
*viewer_connections_ht
;
1934 struct lttng_ht_iter iter
;
1935 struct lttng_viewer_cmd recv_hdr
;
1936 struct relay_connection
*destroy_conn
;
1938 DBG("[thread] Live viewer relay worker started");
1940 rcu_register_thread();
1942 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1944 if (testpoint(relayd_thread_live_worker
)) {
1945 goto error_testpoint
;
1948 /* table of connections indexed on socket */
1949 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1950 if (!viewer_connections_ht
) {
1951 goto viewer_connections_ht_error
;
1954 ret
= create_named_thread_poll_set(&events
, 2,
1955 "Live viewer worker thread epoll");
1957 goto error_poll_create
;
1960 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1969 health_code_update();
1971 /* Infinite blocking call, waiting for transmission */
1972 DBG3("Relayd live viewer worker thread polling...");
1973 health_poll_entry();
1974 ret
= lttng_poll_wait(&events
, -1);
1978 * Restart interrupted system call.
1980 if (errno
== EINTR
) {
1989 * Process control. The control connection is prioritised so we don't
1990 * starve it with high throughput tracing data on the data
1993 for (i
= 0; i
< nb_fd
; i
++) {
1994 /* Fetch once the poll data */
1995 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1996 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1998 health_code_update();
2001 /* No activity for this FD (poll implementation). */
2005 /* Thread quit pipe has been closed. Killing thread. */
2006 ret
= check_thread_quit_pipe(pollfd
, revents
);
2012 /* Inspect the relay conn pipe for new connection. */
2013 if (pollfd
== live_conn_pipe
[0]) {
2014 if (revents
& LPOLLIN
) {
2015 struct relay_connection
*conn
;
2017 ret
= lttng_read(live_conn_pipe
[0],
2018 &conn
, sizeof(conn
));
2022 lttng_poll_add(&events
, conn
->sock
->fd
,
2023 LPOLLIN
| LPOLLRDHUP
);
2024 connection_ht_add(viewer_connections_ht
, conn
);
2025 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
2026 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2027 ERR("Relay live pipe error");
2030 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2034 /* Connection activity. */
2035 struct relay_connection
*conn
;
2037 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
2042 if (revents
& LPOLLIN
) {
2043 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
2044 sizeof(recv_hdr
), 0);
2046 /* Connection closed. */
2047 cleanup_connection_pollfd(&events
, pollfd
);
2048 /* Put "create" ownership reference. */
2049 connection_put(conn
);
2050 DBG("Viewer control conn closed with %d", pollfd
);
2052 ret
= process_control(&recv_hdr
, conn
);
2054 /* Clear the session on error. */
2055 cleanup_connection_pollfd(&events
, pollfd
);
2056 /* Put "create" ownership reference. */
2057 connection_put(conn
);
2058 DBG("Viewer connection closed with %d", pollfd
);
2061 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2062 cleanup_connection_pollfd(&events
, pollfd
);
2063 /* Put "create" ownership reference. */
2064 connection_put(conn
);
2066 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2067 connection_put(conn
);
2070 /* Put local "get_by_sock" reference. */
2071 connection_put(conn
);
2078 (void) fd_tracker_util_poll_clean(the_fd_tracker
, &events
);
2080 /* Cleanup remaining connection object. */
2082 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
2085 health_code_update();
2086 connection_put(destroy_conn
);
2090 lttng_ht_destroy(viewer_connections_ht
);
2091 viewer_connections_ht_error
:
2092 /* Close relay conn pipes */
2093 (void) fd_tracker_util_pipe_close(the_fd_tracker
, live_conn_pipe
);
2095 DBG("Viewer worker thread exited with error");
2097 DBG("Viewer worker thread cleanup complete");
2101 ERR("Health error occurred in %s", __func__
);
2103 health_unregister(health_relayd
);
2104 if (lttng_relay_stop_threads()) {
2105 ERR("Error stopping threads");
2107 rcu_unregister_thread();
2112 * Create the relay command pipe to wake thread_manage_apps.
2113 * Closed in cleanup().
2115 static int create_conn_pipe(void)
2117 return fd_tracker_util_pipe_open_cloexec(the_fd_tracker
,
2118 "Live connection pipe", live_conn_pipe
);
2121 int relayd_live_join(void)
2123 int ret
, retval
= 0;
2126 ret
= pthread_join(live_listener_thread
, &status
);
2129 PERROR("pthread_join live listener");
2133 ret
= pthread_join(live_worker_thread
, &status
);
2136 PERROR("pthread_join live worker");
2140 ret
= pthread_join(live_dispatcher_thread
, &status
);
2143 PERROR("pthread_join live dispatcher");
2147 cleanup_relayd_live();
2155 int relayd_live_create(struct lttng_uri
*uri
)
2157 int ret
= 0, retval
= 0;
2163 goto exit_init_data
;
2167 /* Check if daemon is UID = 0 */
2168 is_root
= !getuid();
2171 if (live_uri
->port
< 1024) {
2172 ERR("Need to be root to use ports < 1024");
2174 goto exit_init_data
;
2178 /* Setup the thread apps communication pipe. */
2179 if (create_conn_pipe()) {
2181 goto exit_init_data
;
2184 /* Init relay command queue. */
2185 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2187 /* Set up max poll set size */
2188 if (lttng_poll_set_max_size()) {
2190 goto exit_init_data
;
2193 /* Setup the dispatcher thread */
2194 ret
= pthread_create(&live_dispatcher_thread
, default_pthread_attr(),
2195 thread_dispatcher
, (void *) NULL
);
2198 PERROR("pthread_create viewer dispatcher");
2200 goto exit_dispatcher_thread
;
2203 /* Setup the worker thread */
2204 ret
= pthread_create(&live_worker_thread
, default_pthread_attr(),
2205 thread_worker
, NULL
);
2208 PERROR("pthread_create viewer worker");
2210 goto exit_worker_thread
;
2213 /* Setup the listener thread */
2214 ret
= pthread_create(&live_listener_thread
, default_pthread_attr(),
2215 thread_listener
, (void *) NULL
);
2218 PERROR("pthread_create viewer listener");
2220 goto exit_listener_thread
;
2224 * All OK, started all threads.
2229 * Join on the live_listener_thread should anything be added after
2230 * the live_listener thread's creation.
2233 exit_listener_thread
:
2235 ret
= pthread_join(live_worker_thread
, &status
);
2238 PERROR("pthread_join live worker");
2243 ret
= pthread_join(live_dispatcher_thread
, &status
);
2246 PERROR("pthread_join live dispatcher");
2249 exit_dispatcher_thread
:
2252 cleanup_relayd_live();