2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
36 #include <urcu/futex.h>
37 #include <urcu/uatomic.h>
42 #include <lttng/lttng.h>
43 #include <common/common.h>
44 #include <common/compat/poll.h>
45 #include <common/compat/socket.h>
46 #include <common/defaults.h>
47 #include <common/futex.h>
48 #include <common/sessiond-comm/sessiond-comm.h>
49 #include <common/sessiond-comm/inet.h>
50 #include <common/sessiond-comm/relayd.h>
51 #include <common/uri.h>
52 #include <common/utils.h>
56 #include "lttng-relayd.h"
58 /* command line options */
59 char *opt_output_path
;
60 static int opt_daemon
;
61 static struct lttng_uri
*control_uri
;
62 static struct lttng_uri
*data_uri
;
65 static int is_root
; /* Set to 1 if the daemon is running as root */
68 * Quit pipe for all threads. This permits a single cancellation point
69 * for all threads when receiving an event on the pipe.
71 static int thread_quit_pipe
[2] = { -1, -1 };
74 * This pipe is used to inform the worker thread that a command is queued and
75 * ready to be processed.
77 static int relay_cmd_pipe
[2] = { -1, -1 };
79 /* Shared between threads */
80 static int dispatch_thread_exit
;
82 static pthread_t listener_thread
;
83 static pthread_t dispatcher_thread
;
84 static pthread_t worker_thread
;
86 static uint64_t last_relay_stream_id
;
87 static uint64_t last_relay_session_id
;
90 * Relay command queue.
92 * The relay_thread_listener and relay_thread_dispatcher communicate with this
95 static struct relay_cmd_queue relay_cmd_queue
;
97 /* buffer allocated at startup, used to store the trace data */
98 static char *data_buffer
;
99 static unsigned int data_buffer_size
;
102 * usage function on stderr
107 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
108 fprintf(stderr
, " -h, --help Display this usage.\n");
109 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
110 fprintf(stderr
, " -C, --control-port Control port listening (URI)\n");
111 fprintf(stderr
, " -D, --data-port Data port listening (URI)\n");
112 fprintf(stderr
, " -o, --output Output path for traces (PATH)\n");
113 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
117 int parse_args(int argc
, char **argv
)
121 char *default_address
;
123 static struct option long_options
[] = {
124 { "control-port", 1, 0, 'C', },
125 { "data-port", 1, 0, 'D', },
126 { "daemonize", 0, 0, 'd', },
127 { "help", 0, 0, 'h', },
128 { "output", 1, 0, 'o', },
129 { "verbose", 0, 0, 'v', },
134 int option_index
= 0;
135 c
= getopt_long(argc
, argv
, "dhv" "C:D:o:",
136 long_options
, &option_index
);
143 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
145 fprintf(stderr
, " with arg %s\n", optarg
);
149 ret
= uri_parse(optarg
, &control_uri
);
151 ERR("Invalid control URI specified");
154 if (control_uri
->port
== 0) {
155 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
159 ret
= uri_parse(optarg
, &data_uri
);
161 ERR("Invalid data URI specified");
164 if (data_uri
->port
== 0) {
165 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
175 ret
= asprintf(&opt_output_path
, "%s", optarg
);
177 PERROR("asprintf opt_output_path");
182 /* Verbose level can increase using multiple -v */
183 lttng_opt_verbose
+= 1;
186 /* Unknown option or other error.
187 * Error is printed by getopt, just return */
193 /* assign default values */
194 if (control_uri
== NULL
) {
195 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
196 DEFAULT_NETWORK_CONTROL_PORT
);
198 PERROR("asprintf default data address");
202 ret
= uri_parse(default_address
, &control_uri
);
203 free(default_address
);
205 ERR("Invalid control URI specified");
209 if (data_uri
== NULL
) {
210 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
211 DEFAULT_NETWORK_DATA_PORT
);
213 PERROR("asprintf default data address");
217 ret
= uri_parse(default_address
, &data_uri
);
218 free(default_address
);
220 ERR("Invalid data URI specified");
237 /* free the dynamically allocated opt_output_path */
238 free(opt_output_path
);
240 /* Close thread quit pipes */
241 utils_close_pipe(thread_quit_pipe
);
243 uri_free(control_uri
);
248 * Write to writable pipe used to notify a thread.
251 int notify_thread_pipe(int wpipe
)
256 ret
= write(wpipe
, "!", 1);
257 } while (ret
< 0 && errno
== EINTR
);
258 if (ret
< 0 || ret
!= 1) {
259 PERROR("write poll pipe");
266 * Stop all threads by closing the thread quit pipe.
269 void stop_threads(void)
273 /* Stopping all threads */
274 DBG("Terminating all threads");
275 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
277 ERR("write error on thread quit pipe");
280 /* Dispatch thread */
281 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
282 futex_nto1_wake(&relay_cmd_queue
.futex
);
286 * Signal handler for the daemon
288 * Simply stop all worker threads, leaving main() return gracefully after
289 * joining all threads and calling cleanup().
292 void sighandler(int sig
)
296 DBG("SIGPIPE caught");
299 DBG("SIGINT caught");
303 DBG("SIGTERM caught");
312 * Setup signal handler for :
313 * SIGINT, SIGTERM, SIGPIPE
316 int set_signal_handler(void)
322 if ((ret
= sigemptyset(&sigset
)) < 0) {
323 PERROR("sigemptyset");
327 sa
.sa_handler
= sighandler
;
330 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
335 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
340 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
345 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
351 * Init thread quit pipe.
353 * Return -1 on error or 0 if all pipes are created.
356 int init_thread_quit_pipe(void)
360 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
366 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
369 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
373 if (events
== NULL
|| size
== 0) {
378 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
384 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
396 * Check if the thread quit pipe was triggered.
398 * Return 1 if it was triggered else 0;
401 int check_thread_quit_pipe(int fd
, uint32_t events
)
403 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
411 * Create and init socket from uri.
414 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
417 struct lttcomm_sock
*sock
= NULL
;
419 sock
= lttcomm_alloc_sock_from_uri(uri
);
421 ERR("Allocating socket");
425 ret
= lttcomm_create_sock(sock
);
429 DBG("Listening on sock %d", sock
->fd
);
431 ret
= sock
->ops
->bind(sock
);
436 ret
= sock
->ops
->listen(sock
, -1);
446 lttcomm_destroy_sock(sock
);
452 * Return nonzero if stream needs to be closed.
455 int close_stream_check(struct relay_stream
*stream
)
458 if (stream
->close_flag
&& stream
->prev_seq
== stream
->last_net_seq_num
) {
460 * We are about to close the stream so set the data pending flag to 1
461 * which will make the end data pending command skip the stream which
462 * is now closed and ready. Note that after proceeding to a file close,
463 * the written file is ready for reading.
465 stream
->data_pending_check_done
= 1;
472 * This thread manages the listening for new connections on the network
475 void *relay_thread_listener(void *data
)
477 int i
, ret
, pollfd
, err
= -1;
479 uint32_t revents
, nb_fd
;
480 struct lttng_poll_event events
;
481 struct lttcomm_sock
*control_sock
, *data_sock
;
483 DBG("[thread] Relay listener started");
485 control_sock
= relay_init_sock(control_uri
);
487 goto error_sock_control
;
490 data_sock
= relay_init_sock(data_uri
);
492 goto error_sock_relay
;
496 * Pass 3 as size here for the thread quit pipe, control and data socket.
498 ret
= create_thread_poll_set(&events
, 3);
500 goto error_create_poll
;
503 /* Add the control socket */
504 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
509 /* Add the data socket */
510 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
516 DBG("Listener accepting connections");
519 ret
= lttng_poll_wait(&events
, -1);
522 * Restart interrupted system call.
524 if (errno
== EINTR
) {
532 DBG("Relay new connection received");
533 for (i
= 0; i
< nb_fd
; i
++) {
534 /* Fetch once the poll data */
535 revents
= LTTNG_POLL_GETEV(&events
, i
);
536 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
538 /* Thread quit pipe has been closed. Killing thread. */
539 ret
= check_thread_quit_pipe(pollfd
, revents
);
545 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
546 ERR("socket poll error");
548 } else if (revents
& LPOLLIN
) {
550 * Get allocated in this thread,
551 * enqueued to a global queue, dequeued
552 * and freed in the worker thread.
554 struct relay_command
*relay_cmd
;
555 struct lttcomm_sock
*newsock
;
557 relay_cmd
= zmalloc(sizeof(struct relay_command
));
558 if (relay_cmd
== NULL
) {
559 PERROR("relay command zmalloc");
563 if (pollfd
== data_sock
->fd
) {
564 newsock
= data_sock
->ops
->accept(data_sock
);
566 PERROR("accepting data sock");
570 relay_cmd
->type
= RELAY_DATA
;
571 DBG("Relay data connection accepted, socket %d", newsock
->fd
);
573 assert(pollfd
== control_sock
->fd
);
574 newsock
= control_sock
->ops
->accept(control_sock
);
576 PERROR("accepting control sock");
580 relay_cmd
->type
= RELAY_CONTROL
;
581 DBG("Relay control connection accepted, socket %d", newsock
->fd
);
583 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
,
586 PERROR("setsockopt inet");
587 lttcomm_destroy_sock(newsock
);
591 relay_cmd
->sock
= newsock
;
593 * Lock free enqueue the request.
595 cds_wfq_enqueue(&relay_cmd_queue
.queue
, &relay_cmd
->node
);
598 * Wake the dispatch queue futex. Implicit memory
599 * barrier with the exchange in cds_wfq_enqueue.
601 futex_nto1_wake(&relay_cmd_queue
.futex
);
609 lttng_poll_clean(&events
);
611 if (data_sock
->fd
>= 0) {
612 ret
= data_sock
->ops
->close(data_sock
);
617 lttcomm_destroy_sock(data_sock
);
619 if (control_sock
->fd
>= 0) {
620 ret
= control_sock
->ops
->close(control_sock
);
625 lttcomm_destroy_sock(control_sock
);
628 DBG("Thread exited with error");
630 DBG("Relay listener thread cleanup complete");
636 * This thread manages the dispatching of the requests to worker threads
639 void *relay_thread_dispatcher(void *data
)
642 struct cds_wfq_node
*node
;
643 struct relay_command
*relay_cmd
= NULL
;
645 DBG("[thread] Relay dispatcher started");
647 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
648 /* Atomically prepare the queue futex */
649 futex_nto1_prepare(&relay_cmd_queue
.futex
);
652 /* Dequeue commands */
653 node
= cds_wfq_dequeue_blocking(&relay_cmd_queue
.queue
);
655 DBG("Woken up but nothing in the relay command queue");
656 /* Continue thread execution */
660 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
661 DBG("Dispatching request waiting on sock %d", relay_cmd
->sock
->fd
);
664 * Inform worker thread of the new request. This
665 * call is blocking so we can be assured that the data will be read
666 * at some point in time or wait to the end of the world :)
669 ret
= write(relay_cmd_pipe
[1], relay_cmd
,
670 sizeof(struct relay_command
));
671 } while (ret
< 0 && errno
== EINTR
);
673 if (ret
< 0 || ret
!= sizeof(struct relay_command
)) {
674 PERROR("write cmd pipe");
677 } while (node
!= NULL
);
679 /* Futex wait on queue. Blocking call on futex() */
680 futex_nto1_wait(&relay_cmd_queue
.futex
);
684 DBG("Dispatch thread dying");
690 * Get stream from stream id.
691 * Need to be called with RCU read-side lock held.
694 struct relay_stream
*relay_stream_from_stream_id(uint64_t stream_id
,
695 struct lttng_ht
*streams_ht
)
697 struct lttng_ht_node_ulong
*node
;
698 struct lttng_ht_iter iter
;
699 struct relay_stream
*ret
;
701 lttng_ht_lookup(streams_ht
,
702 (void *)((unsigned long) stream_id
),
704 node
= lttng_ht_iter_get_node_ulong(&iter
);
706 DBG("Relay stream %" PRIu64
" not found", stream_id
);
711 ret
= caa_container_of(node
, struct relay_stream
, stream_n
);
718 void deferred_free_stream(struct rcu_head
*head
)
720 struct relay_stream
*stream
=
721 caa_container_of(head
, struct relay_stream
, rcu_node
);
722 free(stream
->path_name
);
723 free(stream
->channel_name
);
728 * relay_delete_session: Free all memory associated with a session and
732 void relay_delete_session(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
734 struct lttng_ht_iter iter
;
735 struct lttng_ht_node_ulong
*node
;
736 struct relay_stream
*stream
;
743 DBG("Relay deleting session %" PRIu64
, cmd
->session
->id
);
746 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, node
, node
) {
747 node
= lttng_ht_iter_get_node_ulong(&iter
);
749 stream
= caa_container_of(node
,
750 struct relay_stream
, stream_n
);
751 if (stream
->session
== cmd
->session
) {
752 ret
= close(stream
->fd
);
754 PERROR("close stream fd on delete session");
756 ret
= lttng_ht_del(streams_ht
, &iter
);
758 call_rcu(&stream
->rcu_node
,
759 deferred_free_stream
);
769 * Handle the RELAYD_CREATE_SESSION command.
771 * On success, send back the session id or else return a negative value.
774 int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
775 struct relay_command
*cmd
)
777 int ret
= 0, send_ret
;
778 struct relay_session
*session
;
779 struct lttcomm_relayd_status_session reply
;
784 memset(&reply
, 0, sizeof(reply
));
786 session
= zmalloc(sizeof(struct relay_session
));
787 if (session
== NULL
) {
788 PERROR("relay session zmalloc");
793 session
->id
= ++last_relay_session_id
;
794 session
->sock
= cmd
->sock
;
795 cmd
->session
= session
;
797 reply
.session_id
= htobe64(session
->id
);
799 DBG("Created session %" PRIu64
, session
->id
);
803 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
805 reply
.ret_code
= htobe32(LTTNG_OK
);
808 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
810 ERR("Relayd sending session id");
818 * relay_add_stream: allocate a new stream for a session
821 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
822 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
824 struct relay_session
*session
= cmd
->session
;
825 struct relay_stream
*stream
= NULL
;
826 struct lttcomm_relayd_status_stream reply
;
829 if (!session
|| cmd
->version_check_done
== 0) {
830 ERR("Trying to add a stream before version check");
835 stream
= zmalloc(sizeof(struct relay_stream
));
836 if (stream
== NULL
) {
837 PERROR("relay stream zmalloc");
842 switch (cmd
->minor
) {
843 case 1: /* LTTng sessiond 2.1 */
844 ret
= cmd_recv_stream_2_1(cmd
, stream
);
846 case 2: /* LTTng sessiond 2.2 */
848 ret
= cmd_recv_stream_2_2(cmd
, stream
);
852 goto err_free_stream
;
856 stream
->stream_handle
= ++last_relay_stream_id
;
857 stream
->prev_seq
= -1ULL;
858 stream
->session
= session
;
860 ret
= utils_mkdir_recursive(stream
->path_name
, S_IRWXU
| S_IRWXG
);
862 ERR("relay creating output directory");
867 * No need to use run_as API here because whatever we receives, the relayd
868 * uses its own credentials for the stream files.
870 ret
= utils_create_stream_file(stream
->path_name
, stream
->channel_name
,
871 stream
->tracefile_size
, 0, -1, -1);
873 ERR("Create output file");
877 if (stream
->tracefile_size
) {
878 DBG("Tracefile %s/%s_0 created", stream
->path_name
, stream
->channel_name
);
880 DBG("Tracefile %s/%s created", stream
->path_name
, stream
->channel_name
);
883 lttng_ht_node_init_ulong(&stream
->stream_n
,
884 (unsigned long) stream
->stream_handle
);
885 lttng_ht_add_unique_ulong(streams_ht
,
888 DBG("Relay new stream added %s", stream
->channel_name
);
891 reply
.handle
= htobe64(stream
->stream_handle
);
892 /* send the session id to the client or a negative return code on error */
894 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
895 /* stream was not properly added to the ht, so free it */
898 reply
.ret_code
= htobe32(LTTNG_OK
);
901 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
902 sizeof(struct lttcomm_relayd_status_stream
), 0);
904 ERR("Relay sending stream id");
913 free(stream
->path_name
);
914 free(stream
->channel_name
);
920 * relay_close_stream: close a specific stream
923 int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
924 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
926 struct relay_session
*session
= cmd
->session
;
927 struct lttcomm_relayd_close_stream stream_info
;
928 struct lttcomm_relayd_generic_reply reply
;
929 struct relay_stream
*stream
;
931 struct lttng_ht_iter iter
;
933 DBG("Close stream received");
935 if (!session
|| cmd
->version_check_done
== 0) {
936 ERR("Trying to close a stream before version check");
941 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
942 sizeof(struct lttcomm_relayd_close_stream
), 0);
943 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
945 /* Orderly shutdown. Not necessary to print an error. */
946 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
948 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
955 stream
= relay_stream_from_stream_id(be64toh(stream_info
.stream_id
),
962 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
963 stream
->close_flag
= 1;
965 if (close_stream_check(stream
)) {
968 delret
= close(stream
->fd
);
970 PERROR("close stream");
972 iter
.iter
.node
= &stream
->stream_n
.node
;
973 delret
= lttng_ht_del(streams_ht
, &iter
);
975 call_rcu(&stream
->rcu_node
,
976 deferred_free_stream
);
977 DBG("Closed tracefile %d from close stream", stream
->fd
);
984 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
986 reply
.ret_code
= htobe32(LTTNG_OK
);
988 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
989 sizeof(struct lttcomm_relayd_generic_reply
), 0);
991 ERR("Relay sending stream id");
1000 * relay_unknown_command: send -1 if received unknown command
1003 void relay_unknown_command(struct relay_command
*cmd
)
1005 struct lttcomm_relayd_generic_reply reply
;
1008 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1009 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1010 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1012 ERR("Relay sending unknown command");
1017 * relay_start: send an acknowledgment to the client to tell if we are
1018 * ready to receive data. We are ready if a session is established.
1021 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1022 struct relay_command
*cmd
)
1024 int ret
= htobe32(LTTNG_OK
);
1025 struct lttcomm_relayd_generic_reply reply
;
1026 struct relay_session
*session
= cmd
->session
;
1029 DBG("Trying to start the streaming without a session established");
1030 ret
= htobe32(LTTNG_ERR_UNK
);
1033 reply
.ret_code
= ret
;
1034 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1035 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1037 ERR("Relay sending start ack");
1044 * Append padding to the file pointed by the file descriptor fd.
1046 static int write_padding_to_file(int fd
, uint32_t size
)
1055 zeros
= zmalloc(size
);
1056 if (zeros
== NULL
) {
1057 PERROR("zmalloc zeros for padding");
1063 ret
= write(fd
, zeros
, size
);
1064 } while (ret
< 0 && errno
== EINTR
);
1065 if (ret
< 0 || ret
!= size
) {
1066 PERROR("write padding to file");
1076 * relay_recv_metadata: receive the metada for the session.
1079 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1080 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1082 int ret
= htobe32(LTTNG_OK
);
1083 struct relay_session
*session
= cmd
->session
;
1084 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1085 struct relay_stream
*metadata_stream
;
1086 uint64_t data_size
, payload_size
;
1089 ERR("Metadata sent before version check");
1094 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1095 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1096 ERR("Incorrect data size");
1100 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1102 if (data_buffer_size
< data_size
) {
1103 /* In case the realloc fails, we can free the memory */
1106 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1107 if (!tmp_data_ptr
) {
1108 ERR("Allocating data buffer");
1113 data_buffer
= tmp_data_ptr
;
1114 data_buffer_size
= data_size
;
1116 memset(data_buffer
, 0, data_size
);
1117 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1118 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1119 if (ret
< 0 || ret
!= data_size
) {
1121 /* Orderly shutdown. Not necessary to print an error. */
1122 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1124 ERR("Relay didn't receive the whole metadata");
1129 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1132 metadata_stream
= relay_stream_from_stream_id(
1133 be64toh(metadata_struct
->stream_id
), streams_ht
);
1134 if (!metadata_stream
) {
1140 ret
= write(metadata_stream
->fd
, metadata_struct
->payload
,
1142 } while (ret
< 0 && errno
== EINTR
);
1143 if (ret
< 0 || ret
!= payload_size
) {
1144 ERR("Relay error writing metadata on file");
1149 ret
= write_padding_to_file(metadata_stream
->fd
,
1150 be32toh(metadata_struct
->padding_size
));
1155 DBG2("Relay metadata written");
1164 * relay_send_version: send relayd version number
1167 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1168 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1171 struct lttcomm_relayd_version reply
, msg
;
1175 cmd
->version_check_done
= 1;
1177 /* Get version from the other side. */
1178 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1179 if (ret
< 0 || ret
!= sizeof(msg
)) {
1181 /* Orderly shutdown. Not necessary to print an error. */
1182 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1184 ERR("Relay failed to receive the version values.");
1190 ret
= sscanf(VERSION
, "%10u.%10u", &reply
.major
, &reply
.minor
);
1192 ERR("Error in scanning version");
1197 /* Major versions must be the same */
1198 if (reply
.major
!= be32toh(msg
.major
)) {
1199 DBG("Incompatible major versions (%u vs %u), deleting session",
1200 reply
.major
, be32toh(msg
.major
));
1201 relay_delete_session(cmd
, streams_ht
);
1206 cmd
->major
= reply
.major
;
1207 /* We adapt to the lowest compatible version */
1208 if (reply
.minor
<= be32toh(msg
.minor
)) {
1209 cmd
->minor
= reply
.minor
;
1211 cmd
->minor
= be32toh(msg
.minor
);
1214 reply
.major
= htobe32(reply
.major
);
1215 reply
.minor
= htobe32(reply
.minor
);
1216 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1217 sizeof(struct lttcomm_relayd_version
), 0);
1219 ERR("Relay sending version");
1222 DBG("Version check done using protocol %u.%u", cmd
->major
,
1230 * Check for data pending for a given stream id from the session daemon.
1233 int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1234 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1236 struct relay_session
*session
= cmd
->session
;
1237 struct lttcomm_relayd_data_pending msg
;
1238 struct lttcomm_relayd_generic_reply reply
;
1239 struct relay_stream
*stream
;
1241 uint64_t last_net_seq_num
, stream_id
;
1243 DBG("Data pending command received");
1245 if (!session
|| cmd
->version_check_done
== 0) {
1246 ERR("Trying to check for data before version check");
1248 goto end_no_session
;
1251 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1252 if (ret
< sizeof(msg
)) {
1254 /* Orderly shutdown. Not necessary to print an error. */
1255 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1257 ERR("Relay didn't receive valid data_pending struct size : %d",
1261 goto end_no_session
;
1264 stream_id
= be64toh(msg
.stream_id
);
1265 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1268 stream
= relay_stream_from_stream_id(stream_id
, streams_ht
);
1269 if (stream
== NULL
) {
1274 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1275 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1278 /* Avoid wrapping issue */
1279 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1280 /* Data has in fact been written and is NOT pending */
1283 /* Data still being streamed thus pending */
1287 /* Pending check is now done. */
1288 stream
->data_pending_check_done
= 1;
1293 reply
.ret_code
= htobe32(ret
);
1294 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1296 ERR("Relay data pending ret code failed");
1304 * Wait for the control socket to reach a quiescent state.
1306 * Note that for now, when receiving this command from the session daemon, this
1307 * means that every subsequent commands or data received on the control socket
1308 * has been handled. So, this is why we simply return OK here.
1311 int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1312 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1316 struct relay_stream
*stream
;
1317 struct lttng_ht_iter iter
;
1318 struct lttcomm_relayd_quiescent_control msg
;
1319 struct lttcomm_relayd_generic_reply reply
;
1321 DBG("Checking quiescent state on control socket");
1323 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1324 ERR("Trying to check for data before version check");
1326 goto end_no_session
;
1329 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1330 if (ret
< sizeof(msg
)) {
1332 /* Orderly shutdown. Not necessary to print an error. */
1333 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1335 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1339 goto end_no_session
;
1342 stream_id
= be64toh(msg
.stream_id
);
1345 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1346 if (stream
->stream_handle
== stream_id
) {
1347 stream
->data_pending_check_done
= 1;
1348 DBG("Relay quiescent control pending flag set to %" PRIu64
,
1355 reply
.ret_code
= htobe32(LTTNG_OK
);
1356 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1358 ERR("Relay data quiescent control ret code failed");
1366 * Initialize a data pending command. This means that a client is about to ask
1367 * for data pending for each stream he/she holds. Simply iterate over all
1368 * streams of a session and set the data_pending_check_done flag.
1370 * This command returns to the client a LTTNG_OK code.
1373 int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1374 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1377 struct lttng_ht_iter iter
;
1378 struct lttcomm_relayd_begin_data_pending msg
;
1379 struct lttcomm_relayd_generic_reply reply
;
1380 struct relay_stream
*stream
;
1381 uint64_t session_id
;
1387 DBG("Init streams for data pending");
1389 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1390 ERR("Trying to check for data before version check");
1392 goto end_no_session
;
1395 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1396 if (ret
< sizeof(msg
)) {
1398 /* Orderly shutdown. Not necessary to print an error. */
1399 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1401 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1405 goto end_no_session
;
1408 session_id
= be64toh(msg
.session_id
);
1411 * Iterate over all streams to set the begin data pending flag. For now, the
1412 * streams are indexed by stream handle so we have to iterate over all
1413 * streams to find the one associated with the right session_id.
1416 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1417 if (stream
->session
->id
== session_id
) {
1418 stream
->data_pending_check_done
= 0;
1419 DBG("Set begin data pending flag to stream %" PRIu64
,
1420 stream
->stream_handle
);
1425 /* All good, send back reply. */
1426 reply
.ret_code
= htobe32(LTTNG_OK
);
1428 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1430 ERR("Relay begin data pending send reply failed");
1438 * End data pending command. This will check, for a given session id, if each
1439 * stream associated with it has its data_pending_check_done flag set. If not,
1440 * this means that the client lost track of the stream but the data is still
1441 * being streamed on our side. In this case, we inform the client that data is
1444 * Return to the client if there is data in flight or not with a ret_code.
1447 int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1448 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1451 struct lttng_ht_iter iter
;
1452 struct lttcomm_relayd_end_data_pending msg
;
1453 struct lttcomm_relayd_generic_reply reply
;
1454 struct relay_stream
*stream
;
1455 uint64_t session_id
;
1456 uint32_t is_data_inflight
= 0;
1462 DBG("End data pending command");
1464 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1465 ERR("Trying to check for data before version check");
1467 goto end_no_session
;
1470 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1471 if (ret
< sizeof(msg
)) {
1473 /* Orderly shutdown. Not necessary to print an error. */
1474 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1476 ERR("Relay didn't receive valid end data_pending struct size: %d",
1480 goto end_no_session
;
1483 session_id
= be64toh(msg
.session_id
);
1485 /* Iterate over all streams to see if the begin data pending flag is set. */
1487 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1488 if (stream
->session
->id
== session_id
&&
1489 !stream
->data_pending_check_done
) {
1490 is_data_inflight
= 1;
1491 DBG("Data is still in flight for stream %" PRIu64
,
1492 stream
->stream_handle
);
1498 /* All good, send back reply. */
1499 reply
.ret_code
= htobe32(is_data_inflight
);
1501 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1503 ERR("Relay end data pending send reply failed");
1511 * relay_process_control: Process the commands received on the control socket
1514 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1515 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1519 switch (be32toh(recv_hdr
->cmd
)) {
1520 case RELAYD_CREATE_SESSION
:
1521 ret
= relay_create_session(recv_hdr
, cmd
);
1523 case RELAYD_ADD_STREAM
:
1524 ret
= relay_add_stream(recv_hdr
, cmd
, streams_ht
);
1526 case RELAYD_START_DATA
:
1527 ret
= relay_start(recv_hdr
, cmd
);
1529 case RELAYD_SEND_METADATA
:
1530 ret
= relay_recv_metadata(recv_hdr
, cmd
, streams_ht
);
1532 case RELAYD_VERSION
:
1533 ret
= relay_send_version(recv_hdr
, cmd
, streams_ht
);
1535 case RELAYD_CLOSE_STREAM
:
1536 ret
= relay_close_stream(recv_hdr
, cmd
, streams_ht
);
1538 case RELAYD_DATA_PENDING
:
1539 ret
= relay_data_pending(recv_hdr
, cmd
, streams_ht
);
1541 case RELAYD_QUIESCENT_CONTROL
:
1542 ret
= relay_quiescent_control(recv_hdr
, cmd
, streams_ht
);
1544 case RELAYD_BEGIN_DATA_PENDING
:
1545 ret
= relay_begin_data_pending(recv_hdr
, cmd
, streams_ht
);
1547 case RELAYD_END_DATA_PENDING
:
1548 ret
= relay_end_data_pending(recv_hdr
, cmd
, streams_ht
);
1550 case RELAYD_UPDATE_SYNC_INFO
:
1552 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
1553 relay_unknown_command(cmd
);
1563 * relay_process_data: Process the data received on the data socket
1566 int relay_process_data(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1569 struct relay_stream
*stream
;
1570 struct lttcomm_relayd_data_hdr data_hdr
;
1572 uint64_t net_seq_num
;
1575 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &data_hdr
,
1576 sizeof(struct lttcomm_relayd_data_hdr
), 0);
1579 /* Orderly shutdown. Not necessary to print an error. */
1580 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1582 ERR("Unable to receive data header on sock %d", cmd
->sock
->fd
);
1588 stream_id
= be64toh(data_hdr
.stream_id
);
1591 stream
= relay_stream_from_stream_id(stream_id
, streams_ht
);
1597 data_size
= be32toh(data_hdr
.data_size
);
1598 if (data_buffer_size
< data_size
) {
1601 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1602 if (!tmp_data_ptr
) {
1603 ERR("Allocating data buffer");
1608 data_buffer
= tmp_data_ptr
;
1609 data_buffer_size
= data_size
;
1611 memset(data_buffer
, 0, data_size
);
1613 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
1615 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
1616 data_size
, stream_id
, net_seq_num
);
1617 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1620 /* Orderly shutdown. Not necessary to print an error. */
1621 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1627 if (stream
->tracefile_size
> 0 &&
1628 (stream
->tracefile_size_current
+ data_size
) >
1629 stream
->tracefile_size
) {
1630 ret
= utils_rotate_stream_file(stream
->path_name
,
1631 stream
->channel_name
, stream
->tracefile_size
,
1632 stream
->tracefile_count
, -1, -1,
1633 stream
->fd
, &(stream
->tracefile_count_current
));
1635 ERR("Rotating output file");
1640 stream
->tracefile_size_current
+= data_size
;
1642 ret
= write(stream
->fd
, data_buffer
, data_size
);
1643 } while (ret
< 0 && errno
== EINTR
);
1644 if (ret
< 0 || ret
!= data_size
) {
1645 ERR("Relay error writing data to file");
1650 DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64
,
1651 ret
, stream
->stream_handle
);
1653 ret
= write_padding_to_file(stream
->fd
, be32toh(data_hdr
.padding_size
));
1658 stream
->prev_seq
= net_seq_num
;
1660 /* Check if we need to close the FD */
1661 if (close_stream_check(stream
)) {
1663 struct lttng_ht_iter iter
;
1665 cret
= close(stream
->fd
);
1667 PERROR("close stream process data");
1669 iter
.iter
.node
= &stream
->stream_n
.node
;
1670 ret
= lttng_ht_del(streams_ht
, &iter
);
1672 call_rcu(&stream
->rcu_node
,
1673 deferred_free_stream
);
1674 DBG("Closed tracefile %d after recv data", stream
->fd
);
1684 void relay_cleanup_poll_connection(struct lttng_poll_event
*events
, int pollfd
)
1688 lttng_poll_del(events
, pollfd
);
1690 ret
= close(pollfd
);
1692 ERR("Closing pollfd %d", pollfd
);
1697 int relay_add_connection(int fd
, struct lttng_poll_event
*events
,
1698 struct lttng_ht
*relay_connections_ht
)
1700 struct relay_command
*relay_connection
;
1703 relay_connection
= zmalloc(sizeof(struct relay_command
));
1704 if (relay_connection
== NULL
) {
1705 PERROR("Relay command zmalloc");
1709 ret
= read(fd
, relay_connection
, sizeof(struct relay_command
));
1710 } while (ret
< 0 && errno
== EINTR
);
1711 if (ret
< 0 || ret
< sizeof(struct relay_command
)) {
1712 PERROR("read relay cmd pipe");
1716 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
1717 (unsigned long) relay_connection
->sock
->fd
);
1719 lttng_ht_add_unique_ulong(relay_connections_ht
,
1720 &relay_connection
->sock_n
);
1722 return lttng_poll_add(events
,
1723 relay_connection
->sock
->fd
,
1724 LPOLLIN
| LPOLLRDHUP
);
1727 free(relay_connection
);
1733 void deferred_free_connection(struct rcu_head
*head
)
1735 struct relay_command
*relay_connection
=
1736 caa_container_of(head
, struct relay_command
, rcu_node
);
1738 lttcomm_destroy_sock(relay_connection
->sock
);
1739 free(relay_connection
);
1743 void relay_del_connection(struct lttng_ht
*relay_connections_ht
,
1744 struct lttng_ht
*streams_ht
, struct lttng_ht_iter
*iter
,
1745 struct relay_command
*relay_connection
)
1749 ret
= lttng_ht_del(relay_connections_ht
, iter
);
1751 if (relay_connection
->type
== RELAY_CONTROL
) {
1752 relay_delete_session(relay_connection
, streams_ht
);
1755 call_rcu(&relay_connection
->rcu_node
,
1756 deferred_free_connection
);
1760 * This thread does the actual work
1763 void *relay_thread_worker(void *data
)
1765 int ret
, err
= -1, last_seen_data_fd
= -1;
1767 struct relay_command
*relay_connection
;
1768 struct lttng_poll_event events
;
1769 struct lttng_ht
*relay_connections_ht
;
1770 struct lttng_ht_node_ulong
*node
;
1771 struct lttng_ht_iter iter
;
1772 struct lttng_ht
*streams_ht
;
1773 struct lttcomm_relayd_hdr recv_hdr
;
1775 DBG("[thread] Relay worker started");
1777 rcu_register_thread();
1779 /* table of connections indexed on socket */
1780 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1781 if (!relay_connections_ht
) {
1782 goto relay_connections_ht_error
;
1785 /* tables of streams indexed by stream ID */
1786 streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1788 goto streams_ht_error
;
1791 ret
= create_thread_poll_set(&events
, 2);
1793 goto error_poll_create
;
1796 ret
= lttng_poll_add(&events
, relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1803 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
1805 /* Infinite blocking call, waiting for transmission */
1806 DBG3("Relayd worker thread polling...");
1807 ret
= lttng_poll_wait(&events
, -1);
1810 * Restart interrupted system call.
1812 if (errno
== EINTR
) {
1821 * Process control. The control connection is prioritised so we don't
1822 * starve it with high throughout put tracing data on the data
1825 for (i
= 0; i
< nb_fd
; i
++) {
1826 /* Fetch once the poll data */
1827 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1828 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1830 /* Thread quit pipe has been closed. Killing thread. */
1831 ret
= check_thread_quit_pipe(pollfd
, revents
);
1837 /* Inspect the relay cmd pipe for new connection */
1838 if (pollfd
== relay_cmd_pipe
[0]) {
1839 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1840 ERR("Relay pipe error");
1842 } else if (revents
& LPOLLIN
) {
1843 DBG("Relay command received");
1844 ret
= relay_add_connection(relay_cmd_pipe
[0],
1845 &events
, relay_connections_ht
);
1850 } else if (revents
) {
1852 lttng_ht_lookup(relay_connections_ht
,
1853 (void *)((unsigned long) pollfd
),
1855 node
= lttng_ht_iter_get_node_ulong(&iter
);
1857 DBG2("Relay sock %d not found", pollfd
);
1861 relay_connection
= caa_container_of(node
,
1862 struct relay_command
, sock_n
);
1864 if (revents
& (LPOLLERR
)) {
1866 relay_cleanup_poll_connection(&events
, pollfd
);
1867 relay_del_connection(relay_connections_ht
,
1870 if (last_seen_data_fd
== pollfd
) {
1871 last_seen_data_fd
= last_notdel_data_fd
;
1873 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
1874 DBG("Socket %d hung up", pollfd
);
1875 relay_cleanup_poll_connection(&events
, pollfd
);
1876 relay_del_connection(relay_connections_ht
,
1879 if (last_seen_data_fd
== pollfd
) {
1880 last_seen_data_fd
= last_notdel_data_fd
;
1882 } else if (revents
& LPOLLIN
) {
1883 /* control socket */
1884 if (relay_connection
->type
== RELAY_CONTROL
) {
1885 ret
= relay_connection
->sock
->ops
->recvmsg(
1886 relay_connection
->sock
, &recv_hdr
,
1887 sizeof(struct lttcomm_relayd_hdr
), 0);
1888 /* connection closed */
1890 relay_cleanup_poll_connection(&events
, pollfd
);
1891 relay_del_connection(relay_connections_ht
,
1894 DBG("Control connection closed with %d", pollfd
);
1896 if (relay_connection
->session
) {
1897 DBG2("Relay worker receiving data for session : %" PRIu64
,
1898 relay_connection
->session
->id
);
1900 ret
= relay_process_control(&recv_hdr
,
1904 /* Clear the session on error. */
1905 relay_cleanup_poll_connection(&events
, pollfd
);
1906 relay_del_connection(relay_connections_ht
,
1909 DBG("Connection closed with %d", pollfd
);
1915 * Flag the last seen data fd not deleted. It will be
1916 * used as the last seen fd if any fd gets deleted in
1919 last_notdel_data_fd
= pollfd
;
1927 * The last loop handled a control request, go back to poll to make
1928 * sure we prioritise the control socket.
1934 if (last_seen_data_fd
>= 0) {
1935 for (i
= 0; i
< nb_fd
; i
++) {
1936 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1937 if (last_seen_data_fd
== pollfd
) {
1944 /* Process data connection. */
1945 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
1946 /* Fetch the poll data. */
1947 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1948 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1950 /* Skip the command pipe. It's handled in the first loop. */
1951 if (pollfd
== relay_cmd_pipe
[0]) {
1957 lttng_ht_lookup(relay_connections_ht
,
1958 (void *)((unsigned long) pollfd
),
1960 node
= lttng_ht_iter_get_node_ulong(&iter
);
1962 /* Skip it. Might be removed before. */
1966 relay_connection
= caa_container_of(node
,
1967 struct relay_command
, sock_n
);
1969 if (revents
& LPOLLIN
) {
1970 if (relay_connection
->type
!= RELAY_DATA
) {
1974 ret
= relay_process_data(relay_connection
, streams_ht
);
1975 /* connection closed */
1977 relay_cleanup_poll_connection(&events
, pollfd
);
1978 relay_del_connection(relay_connections_ht
,
1981 DBG("Data connection closed with %d", pollfd
);
1983 * Every goto restart call sets the last seen fd where
1984 * here we don't really care since we gracefully
1985 * continue the loop after the connection is deleted.
1988 /* Keep last seen port. */
1989 last_seen_data_fd
= pollfd
;
1997 last_seen_data_fd
= -1;
2002 lttng_poll_clean(&events
);
2004 /* empty the hash table and free the memory */
2006 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
2007 node
= lttng_ht_iter_get_node_ulong(&iter
);
2009 relay_connection
= caa_container_of(node
,
2010 struct relay_command
, sock_n
);
2011 relay_del_connection(relay_connections_ht
,
2018 lttng_ht_destroy(streams_ht
);
2020 lttng_ht_destroy(relay_connections_ht
);
2021 relay_connections_ht_error
:
2022 /* Close relay cmd pipes */
2023 utils_close_pipe(relay_cmd_pipe
);
2025 DBG("Thread exited with error");
2027 DBG("Worker thread cleanup complete");
2030 rcu_unregister_thread();
2035 * Create the relay command pipe to wake thread_manage_apps.
2036 * Closed in cleanup().
2038 static int create_relay_cmd_pipe(void)
2042 ret
= utils_create_pipe_cloexec(relay_cmd_pipe
);
2050 int main(int argc
, char **argv
)
2055 /* Create thread quit pipe */
2056 if ((ret
= init_thread_quit_pipe()) < 0) {
2060 /* Parse arguments */
2062 if ((ret
= parse_args(argc
, argv
)) < 0) {
2066 if ((ret
= set_signal_handler()) < 0) {
2070 /* Try to create directory if -o, --output is specified. */
2071 if (opt_output_path
) {
2072 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
);
2074 ERR("Unable to create %s", opt_output_path
);
2088 /* Check if daemon is UID = 0 */
2089 is_root
= !getuid();
2092 if (control_uri
->port
< 1024 || data_uri
->port
< 1024) {
2093 ERR("Need to be root to use ports < 1024");
2099 /* Setup the thread apps communication pipe. */
2100 if ((ret
= create_relay_cmd_pipe()) < 0) {
2104 /* Init relay command queue. */
2105 cds_wfq_init(&relay_cmd_queue
.queue
);
2107 /* Set up max poll set size */
2108 lttng_poll_set_max_size();
2110 /* Setup the dispatcher thread */
2111 ret
= pthread_create(&dispatcher_thread
, NULL
,
2112 relay_thread_dispatcher
, (void *) NULL
);
2114 PERROR("pthread_create dispatcher");
2115 goto exit_dispatcher
;
2118 /* Setup the worker thread */
2119 ret
= pthread_create(&worker_thread
, NULL
,
2120 relay_thread_worker
, (void *) NULL
);
2122 PERROR("pthread_create worker");
2126 /* Setup the listener thread */
2127 ret
= pthread_create(&listener_thread
, NULL
,
2128 relay_thread_listener
, (void *) NULL
);
2130 PERROR("pthread_create listener");
2135 ret
= pthread_join(listener_thread
, &status
);
2137 PERROR("pthread_join");
2138 goto error
; /* join error, exit without cleanup */
2142 ret
= pthread_join(worker_thread
, &status
);
2144 PERROR("pthread_join");
2145 goto error
; /* join error, exit without cleanup */
2149 ret
= pthread_join(dispatcher_thread
, &status
);
2151 PERROR("pthread_join");
2152 goto error
; /* join error, exit without cleanup */