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/hashtable/hashtable.h>
51 #include <common/sessiond-comm/relayd.h>
52 #include <common/uri.h>
53 #include <common/utils.h>
55 #include "lttng-relayd.h"
57 /* command line options */
58 static int opt_daemon
;
59 static char *opt_output_path
;
60 static struct lttng_uri
*control_uri
;
61 static struct lttng_uri
*data_uri
;
64 static int is_root
; /* Set to 1 if the daemon is running as root */
67 * Quit pipe for all threads. This permits a single cancellation point
68 * for all threads when receiving an event on the pipe.
70 static int thread_quit_pipe
[2] = { -1, -1 };
73 * This pipe is used to inform the worker thread that a command is queued and
74 * ready to be processed.
76 static int relay_cmd_pipe
[2] = { -1, -1 };
78 /* Shared between threads */
79 static int dispatch_thread_exit
;
81 static pthread_t listener_thread
;
82 static pthread_t dispatcher_thread
;
83 static pthread_t worker_thread
;
85 static uint64_t last_relay_stream_id
;
86 static uint64_t last_relay_session_id
;
89 * Relay command queue.
91 * The relay_thread_listener and relay_thread_dispatcher communicate with this
94 static struct relay_cmd_queue relay_cmd_queue
;
96 /* buffer allocated at startup, used to store the trace data */
97 static char *data_buffer
;
98 static unsigned int data_buffer_size
;
101 * usage function on stderr
106 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
107 fprintf(stderr
, " -h, --help Display this usage.\n");
108 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
109 fprintf(stderr
, " -C, --control-port Control port listening (URI)\n");
110 fprintf(stderr
, " -D, --data-port Data port listening (URI)\n");
111 fprintf(stderr
, " -o, --output Output path for traces (PATH)\n");
112 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
116 int parse_args(int argc
, char **argv
)
120 char *default_address
;
122 static struct option long_options
[] = {
123 { "control-port", 1, 0, 'C', },
124 { "data-port", 1, 0, 'D', },
125 { "daemonize", 0, 0, 'd', },
126 { "help", 0, 0, 'h', },
127 { "output", 1, 0, 'o', },
128 { "verbose", 0, 0, 'v', },
133 int option_index
= 0;
134 c
= getopt_long(argc
, argv
, "dhv" "C:D:o:",
135 long_options
, &option_index
);
142 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
144 fprintf(stderr
, " with arg %s\n", optarg
);
148 ret
= uri_parse(optarg
, &control_uri
);
150 ERR("Invalid control URI specified");
153 if (control_uri
->port
== 0) {
154 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
158 ret
= uri_parse(optarg
, &data_uri
);
160 ERR("Invalid data URI specified");
163 if (data_uri
->port
== 0) {
164 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
174 ret
= asprintf(&opt_output_path
, "%s", optarg
);
176 PERROR("asprintf opt_output_path");
181 /* Verbose level can increase using multiple -v */
182 lttng_opt_verbose
+= 1;
185 /* Unknown option or other error.
186 * Error is printed by getopt, just return */
192 /* assign default values */
193 if (control_uri
== NULL
) {
194 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
195 DEFAULT_NETWORK_CONTROL_PORT
);
197 PERROR("asprintf default data address");
201 ret
= uri_parse(default_address
, &control_uri
);
202 free(default_address
);
204 ERR("Invalid control URI specified");
208 if (data_uri
== NULL
) {
209 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
210 DEFAULT_NETWORK_DATA_PORT
);
212 PERROR("asprintf default data address");
216 ret
= uri_parse(default_address
, &data_uri
);
217 free(default_address
);
219 ERR("Invalid data URI specified");
236 /* free the dynamically allocated opt_output_path */
237 free(opt_output_path
);
239 /* Close thread quit pipes */
240 utils_close_pipe(thread_quit_pipe
);
242 uri_free(control_uri
);
247 * Write to writable pipe used to notify a thread.
250 int notify_thread_pipe(int wpipe
)
255 ret
= write(wpipe
, "!", 1);
256 } while (ret
< 0 && errno
== EINTR
);
257 if (ret
< 0 || ret
!= 1) {
258 PERROR("write poll pipe");
265 * Stop all threads by closing the thread quit pipe.
268 void stop_threads(void)
272 /* Stopping all threads */
273 DBG("Terminating all threads");
274 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
276 ERR("write error on thread quit pipe");
279 /* Dispatch thread */
280 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
281 futex_nto1_wake(&relay_cmd_queue
.futex
);
285 * Signal handler for the daemon
287 * Simply stop all worker threads, leaving main() return gracefully after
288 * joining all threads and calling cleanup().
291 void sighandler(int sig
)
295 DBG("SIGPIPE caught");
298 DBG("SIGINT caught");
302 DBG("SIGTERM caught");
311 * Setup signal handler for :
312 * SIGINT, SIGTERM, SIGPIPE
315 int set_signal_handler(void)
321 if ((ret
= sigemptyset(&sigset
)) < 0) {
322 PERROR("sigemptyset");
326 sa
.sa_handler
= sighandler
;
329 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
334 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
339 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
344 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
350 * Init thread quit pipe.
352 * Return -1 on error or 0 if all pipes are created.
355 int init_thread_quit_pipe(void)
359 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
365 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
368 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
372 if (events
== NULL
|| size
== 0) {
377 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
383 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
395 * Check if the thread quit pipe was triggered.
397 * Return 1 if it was triggered else 0;
400 int check_thread_quit_pipe(int fd
, uint32_t events
)
402 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
410 * Create and init socket from uri.
413 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
416 struct lttcomm_sock
*sock
= NULL
;
418 sock
= lttcomm_alloc_sock_from_uri(uri
);
420 ERR("Allocating socket");
424 ret
= lttcomm_create_sock(sock
);
428 DBG("Listening on sock %d", sock
->fd
);
430 ret
= sock
->ops
->bind(sock
);
435 ret
= sock
->ops
->listen(sock
, -1);
445 lttcomm_destroy_sock(sock
);
451 * Return nonzero if stream needs to be closed.
454 int close_stream_check(struct relay_stream
*stream
)
457 if (stream
->close_flag
&& stream
->prev_seq
== stream
->last_net_seq_num
) {
459 * We are about to close the stream so set the data pending flag to 1
460 * which will make the end data pending command skip the stream which
461 * is now closed and ready. Note that after proceeding to a file close,
462 * the written file is ready for reading.
464 stream
->data_pending_check_done
= 1;
471 * This thread manages the listening for new connections on the network
474 void *relay_thread_listener(void *data
)
476 int i
, ret
, pollfd
, err
= -1;
478 uint32_t revents
, nb_fd
;
479 struct lttng_poll_event events
;
480 struct lttcomm_sock
*control_sock
, *data_sock
;
482 DBG("[thread] Relay listener started");
484 control_sock
= relay_init_sock(control_uri
);
486 goto error_sock_control
;
489 data_sock
= relay_init_sock(data_uri
);
491 goto error_sock_relay
;
495 * Pass 3 as size here for the thread quit pipe, control and data socket.
497 ret
= create_thread_poll_set(&events
, 3);
499 goto error_create_poll
;
502 /* Add the control socket */
503 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
508 /* Add the data socket */
509 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
515 DBG("Listener accepting connections");
518 ret
= lttng_poll_wait(&events
, -1);
521 * Restart interrupted system call.
523 if (errno
== EINTR
) {
531 DBG("Relay new connection received");
532 for (i
= 0; i
< nb_fd
; i
++) {
533 /* Fetch once the poll data */
534 revents
= LTTNG_POLL_GETEV(&events
, i
);
535 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
537 /* Thread quit pipe has been closed. Killing thread. */
538 ret
= check_thread_quit_pipe(pollfd
, revents
);
544 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
545 ERR("socket poll error");
547 } else if (revents
& LPOLLIN
) {
549 * Get allocated in this thread,
550 * enqueued to a global queue, dequeued
551 * and freed in the worker thread.
553 struct relay_command
*relay_cmd
;
554 struct lttcomm_sock
*newsock
;
556 relay_cmd
= zmalloc(sizeof(struct relay_command
));
557 if (relay_cmd
== NULL
) {
558 PERROR("relay command zmalloc");
562 if (pollfd
== data_sock
->fd
) {
563 newsock
= data_sock
->ops
->accept(data_sock
);
565 PERROR("accepting data sock");
569 relay_cmd
->type
= RELAY_DATA
;
570 DBG("Relay data connection accepted, socket %d", newsock
->fd
);
572 assert(pollfd
== control_sock
->fd
);
573 newsock
= control_sock
->ops
->accept(control_sock
);
575 PERROR("accepting control sock");
579 relay_cmd
->type
= RELAY_CONTROL
;
580 DBG("Relay control connection accepted, socket %d", newsock
->fd
);
582 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
,
585 PERROR("setsockopt inet");
586 lttcomm_destroy_sock(newsock
);
590 relay_cmd
->sock
= newsock
;
592 * Lock free enqueue the request.
594 cds_wfq_enqueue(&relay_cmd_queue
.queue
, &relay_cmd
->node
);
597 * Wake the dispatch queue futex. Implicit memory
598 * barrier with the exchange in cds_wfq_enqueue.
600 futex_nto1_wake(&relay_cmd_queue
.futex
);
608 lttng_poll_clean(&events
);
610 if (data_sock
->fd
>= 0) {
611 ret
= data_sock
->ops
->close(data_sock
);
616 lttcomm_destroy_sock(data_sock
);
618 if (control_sock
->fd
>= 0) {
619 ret
= control_sock
->ops
->close(control_sock
);
624 lttcomm_destroy_sock(control_sock
);
627 DBG("Thread exited with error");
629 DBG("Relay listener thread cleanup complete");
635 * This thread manages the dispatching of the requests to worker threads
638 void *relay_thread_dispatcher(void *data
)
641 struct cds_wfq_node
*node
;
642 struct relay_command
*relay_cmd
= NULL
;
644 DBG("[thread] Relay dispatcher started");
646 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
647 /* Atomically prepare the queue futex */
648 futex_nto1_prepare(&relay_cmd_queue
.futex
);
651 /* Dequeue commands */
652 node
= cds_wfq_dequeue_blocking(&relay_cmd_queue
.queue
);
654 DBG("Woken up but nothing in the relay command queue");
655 /* Continue thread execution */
659 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
660 DBG("Dispatching request waiting on sock %d", relay_cmd
->sock
->fd
);
663 * Inform worker thread of the new request. This
664 * call is blocking so we can be assured that the data will be read
665 * at some point in time or wait to the end of the world :)
668 ret
= write(relay_cmd_pipe
[1], relay_cmd
,
669 sizeof(struct relay_command
));
670 } while (ret
< 0 && errno
== EINTR
);
672 if (ret
< 0 || ret
!= sizeof(struct relay_command
)) {
673 PERROR("write cmd pipe");
676 } while (node
!= NULL
);
678 /* Futex wait on queue. Blocking call on futex() */
679 futex_nto1_wait(&relay_cmd_queue
.futex
);
683 DBG("Dispatch thread dying");
689 * config_get_default_path
691 * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer.
694 char *config_get_default_path(void)
696 return getenv("HOME");
700 char *create_output_path_auto(char *path_name
)
703 char *traces_path
= NULL
;
704 char *alloc_path
= NULL
;
707 default_path
= config_get_default_path();
708 if (default_path
== NULL
) {
709 ERR("Home path not found.\n \
710 Please specify an output path using -o, --output PATH");
713 alloc_path
= strdup(default_path
);
714 if (alloc_path
== NULL
) {
715 PERROR("Path allocation");
718 ret
= asprintf(&traces_path
, "%s/" DEFAULT_TRACE_DIR_NAME
719 "/%s", alloc_path
, path_name
);
721 PERROR("asprintf trace dir name");
730 char *create_output_path_noauto(char *path_name
)
733 char *traces_path
= NULL
;
736 full_path
= utils_expand_path(opt_output_path
);
737 ret
= asprintf(&traces_path
, "%s/%s", full_path
, path_name
);
739 PERROR("asprintf trace dir name");
748 * create_output_path: create the output trace directory
751 char *create_output_path(char *path_name
)
753 if (opt_output_path
== NULL
) {
754 return create_output_path_auto(path_name
);
756 return create_output_path_noauto(path_name
);
761 * Get stream from stream id.
762 * Need to be called with RCU read-side lock held.
765 struct relay_stream
*relay_stream_from_stream_id(uint64_t stream_id
,
766 struct lttng_ht
*streams_ht
)
768 struct lttng_ht_node_ulong
*node
;
769 struct lttng_ht_iter iter
;
770 struct relay_stream
*ret
;
772 lttng_ht_lookup(streams_ht
,
773 (void *)((unsigned long) stream_id
),
775 node
= lttng_ht_iter_get_node_ulong(&iter
);
777 DBG("Relay stream %" PRIu64
" not found", stream_id
);
782 ret
= caa_container_of(node
, struct relay_stream
, stream_n
);
789 void deferred_free_stream(struct rcu_head
*head
)
791 struct relay_stream
*stream
=
792 caa_container_of(head
, struct relay_stream
, rcu_node
);
797 * relay_delete_session: Free all memory associated with a session and
801 void relay_delete_session(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
803 struct lttng_ht_iter iter
;
804 struct lttng_ht_node_ulong
*node
;
805 struct relay_stream
*stream
;
812 DBG("Relay deleting session %" PRIu64
, cmd
->session
->id
);
815 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, node
, node
) {
816 node
= lttng_ht_iter_get_node_ulong(&iter
);
818 stream
= caa_container_of(node
,
819 struct relay_stream
, stream_n
);
820 if (stream
->session
== cmd
->session
) {
821 ret
= close(stream
->fd
);
823 PERROR("close stream fd on delete session");
825 ret
= lttng_ht_del(streams_ht
, &iter
);
827 call_rcu(&stream
->rcu_node
,
828 deferred_free_stream
);
838 * Handle the RELAYD_CREATE_SESSION command.
840 * On success, send back the session id or else return a negative value.
843 int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
844 struct relay_command
*cmd
)
846 int ret
= 0, send_ret
;
847 struct relay_session
*session
;
848 struct lttcomm_relayd_status_session reply
;
853 memset(&reply
, 0, sizeof(reply
));
855 session
= zmalloc(sizeof(struct relay_session
));
856 if (session
== NULL
) {
857 PERROR("relay session zmalloc");
862 session
->id
= ++last_relay_session_id
;
863 session
->sock
= cmd
->sock
;
864 cmd
->session
= session
;
866 reply
.session_id
= htobe64(session
->id
);
868 DBG("Created session %" PRIu64
, session
->id
);
872 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
874 reply
.ret_code
= htobe32(LTTNG_OK
);
877 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
879 ERR("Relayd sending session id");
887 * relay_add_stream: allocate a new stream for a session
890 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
891 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
893 struct relay_session
*session
= cmd
->session
;
894 struct lttcomm_relayd_add_stream stream_info
;
895 struct relay_stream
*stream
= NULL
;
896 struct lttcomm_relayd_status_stream reply
;
897 char *path
= NULL
, *root_path
= NULL
;
900 if (!session
|| cmd
->version_check_done
== 0) {
901 ERR("Trying to add a stream before version check");
906 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
907 sizeof(struct lttcomm_relayd_add_stream
), 0);
908 if (ret
< sizeof(struct lttcomm_relayd_add_stream
)) {
910 /* Orderly shutdown. Not necessary to print an error. */
911 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
913 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
918 stream
= zmalloc(sizeof(struct relay_stream
));
919 if (stream
== NULL
) {
920 PERROR("relay stream zmalloc");
926 stream
->stream_handle
= ++last_relay_stream_id
;
927 stream
->prev_seq
= -1ULL;
928 stream
->session
= session
;
930 root_path
= create_output_path(stream_info
.pathname
);
935 ret
= utils_mkdir_recursive(root_path
, S_IRWXU
| S_IRWXG
);
937 ERR("relay creating output directory");
941 ret
= asprintf(&path
, "%s/%s", root_path
, stream_info
.channel_name
);
943 PERROR("asprintf stream path");
948 ret
= open(path
, O_WRONLY
|O_CREAT
|O_TRUNC
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
950 PERROR("Relay creating trace file");
955 DBG("Tracefile %s created", path
);
957 lttng_ht_node_init_ulong(&stream
->stream_n
,
958 (unsigned long) stream
->stream_handle
);
959 lttng_ht_add_unique_ulong(streams_ht
,
962 DBG("Relay new stream added %s", stream_info
.channel_name
);
968 reply
.handle
= htobe64(stream
->stream_handle
);
969 /* send the session id to the client or a negative return code on error */
971 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
972 /* stream was not properly added to the ht, so free it */
975 reply
.ret_code
= htobe32(LTTNG_OK
);
978 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
979 sizeof(struct lttcomm_relayd_status_stream
), 0);
981 ERR("Relay sending stream id");
991 * relay_close_stream: close a specific stream
994 int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
995 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
997 struct relay_session
*session
= cmd
->session
;
998 struct lttcomm_relayd_close_stream stream_info
;
999 struct lttcomm_relayd_generic_reply reply
;
1000 struct relay_stream
*stream
;
1002 struct lttng_ht_iter iter
;
1004 DBG("Close stream received");
1006 if (!session
|| cmd
->version_check_done
== 0) {
1007 ERR("Trying to close a stream before version check");
1009 goto end_no_session
;
1012 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
1013 sizeof(struct lttcomm_relayd_close_stream
), 0);
1014 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1016 /* Orderly shutdown. Not necessary to print an error. */
1017 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1019 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1022 goto end_no_session
;
1026 stream
= relay_stream_from_stream_id(be64toh(stream_info
.stream_id
),
1033 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1034 stream
->close_flag
= 1;
1036 if (close_stream_check(stream
)) {
1039 delret
= close(stream
->fd
);
1041 PERROR("close stream");
1043 iter
.iter
.node
= &stream
->stream_n
.node
;
1044 delret
= lttng_ht_del(streams_ht
, &iter
);
1046 call_rcu(&stream
->rcu_node
,
1047 deferred_free_stream
);
1048 DBG("Closed tracefile %d from close stream", stream
->fd
);
1055 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1057 reply
.ret_code
= htobe32(LTTNG_OK
);
1059 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1060 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1062 ERR("Relay sending stream id");
1071 * relay_unknown_command: send -1 if received unknown command
1074 void relay_unknown_command(struct relay_command
*cmd
)
1076 struct lttcomm_relayd_generic_reply reply
;
1079 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1080 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1081 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1083 ERR("Relay sending unknown command");
1088 * relay_start: send an acknowledgment to the client to tell if we are
1089 * ready to receive data. We are ready if a session is established.
1092 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1093 struct relay_command
*cmd
)
1095 int ret
= htobe32(LTTNG_OK
);
1096 struct lttcomm_relayd_generic_reply reply
;
1097 struct relay_session
*session
= cmd
->session
;
1100 DBG("Trying to start the streaming without a session established");
1101 ret
= htobe32(LTTNG_ERR_UNK
);
1104 reply
.ret_code
= ret
;
1105 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1106 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1108 ERR("Relay sending start ack");
1115 * Append padding to the file pointed by the file descriptor fd.
1117 static int write_padding_to_file(int fd
, uint32_t size
)
1126 zeros
= zmalloc(size
);
1127 if (zeros
== NULL
) {
1128 PERROR("zmalloc zeros for padding");
1134 ret
= write(fd
, zeros
, size
);
1135 } while (ret
< 0 && errno
== EINTR
);
1136 if (ret
< 0 || ret
!= size
) {
1137 PERROR("write padding to file");
1147 * relay_recv_metadata: receive the metada for the session.
1150 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1151 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1153 int ret
= htobe32(LTTNG_OK
);
1154 struct relay_session
*session
= cmd
->session
;
1155 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1156 struct relay_stream
*metadata_stream
;
1157 uint64_t data_size
, payload_size
;
1160 ERR("Metadata sent before version check");
1165 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1166 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1167 ERR("Incorrect data size");
1171 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1173 if (data_buffer_size
< data_size
) {
1174 /* In case the realloc fails, we can free the memory */
1177 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1178 if (!tmp_data_ptr
) {
1179 ERR("Allocating data buffer");
1184 data_buffer
= tmp_data_ptr
;
1185 data_buffer_size
= data_size
;
1187 memset(data_buffer
, 0, data_size
);
1188 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1189 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1190 if (ret
< 0 || ret
!= data_size
) {
1192 /* Orderly shutdown. Not necessary to print an error. */
1193 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1195 ERR("Relay didn't receive the whole metadata");
1200 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1203 metadata_stream
= relay_stream_from_stream_id(
1204 be64toh(metadata_struct
->stream_id
), streams_ht
);
1205 if (!metadata_stream
) {
1211 ret
= write(metadata_stream
->fd
, metadata_struct
->payload
,
1213 } while (ret
< 0 && errno
== EINTR
);
1214 if (ret
< 0 || ret
!= payload_size
) {
1215 ERR("Relay error writing metadata on file");
1220 ret
= write_padding_to_file(metadata_stream
->fd
,
1221 be32toh(metadata_struct
->padding_size
));
1226 DBG2("Relay metadata written");
1235 * relay_send_version: send relayd version number
1238 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1239 struct relay_command
*cmd
)
1242 struct lttcomm_relayd_version reply
, msg
;
1246 cmd
->version_check_done
= 1;
1248 /* Get version from the other side. */
1249 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1250 if (ret
< 0 || ret
!= sizeof(msg
)) {
1252 /* Orderly shutdown. Not necessary to print an error. */
1253 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1255 ERR("Relay failed to receive the version values.");
1262 * For now, we just ignore the received version but after 2.1 stable
1263 * release, a check must be done to see if we either adapt to the other
1264 * side version (which MUST be lower than us) or keep the latest data
1265 * structure considering that the other side will adapt.
1268 ret
= sscanf(VERSION
, "%10u.%10u", &reply
.major
, &reply
.minor
);
1270 ERR("Error in scanning version");
1274 reply
.major
= htobe32(reply
.major
);
1275 reply
.minor
= htobe32(reply
.minor
);
1276 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1277 sizeof(struct lttcomm_relayd_version
), 0);
1279 ERR("Relay sending version");
1281 DBG("Version check done (%u.%u)", be32toh(reply
.major
),
1282 be32toh(reply
.minor
));
1289 * Check for data pending for a given stream id from the session daemon.
1292 int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1293 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1295 struct relay_session
*session
= cmd
->session
;
1296 struct lttcomm_relayd_data_pending msg
;
1297 struct lttcomm_relayd_generic_reply reply
;
1298 struct relay_stream
*stream
;
1300 uint64_t last_net_seq_num
, stream_id
;
1302 DBG("Data pending command received");
1304 if (!session
|| cmd
->version_check_done
== 0) {
1305 ERR("Trying to check for data before version check");
1307 goto end_no_session
;
1310 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1311 if (ret
< sizeof(msg
)) {
1313 /* Orderly shutdown. Not necessary to print an error. */
1314 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1316 ERR("Relay didn't receive valid data_pending struct size : %d",
1320 goto end_no_session
;
1323 stream_id
= be64toh(msg
.stream_id
);
1324 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1327 stream
= relay_stream_from_stream_id(stream_id
, streams_ht
);
1328 if (stream
== NULL
) {
1333 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1334 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1337 /* Avoid wrapping issue */
1338 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1339 /* Data has in fact been written and is NOT pending */
1342 /* Data still being streamed thus pending */
1346 /* Pending check is now done. */
1347 stream
->data_pending_check_done
= 1;
1352 reply
.ret_code
= htobe32(ret
);
1353 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1355 ERR("Relay data pending ret code failed");
1363 * Wait for the control socket to reach a quiescent state.
1365 * Note that for now, when receiving this command from the session daemon, this
1366 * means that every subsequent commands or data received on the control socket
1367 * has been handled. So, this is why we simply return OK here.
1370 int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1371 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1375 struct relay_stream
*stream
;
1376 struct lttng_ht_iter iter
;
1377 struct lttcomm_relayd_quiescent_control msg
;
1378 struct lttcomm_relayd_generic_reply reply
;
1380 DBG("Checking quiescent state on control socket");
1382 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1383 ERR("Trying to check for data before version check");
1385 goto end_no_session
;
1388 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1389 if (ret
< sizeof(msg
)) {
1391 /* Orderly shutdown. Not necessary to print an error. */
1392 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1394 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1398 goto end_no_session
;
1401 stream_id
= be64toh(msg
.stream_id
);
1404 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1405 if (stream
->stream_handle
== stream_id
) {
1406 stream
->data_pending_check_done
= 1;
1407 DBG("Relay quiescent control pending flag set to %" PRIu64
,
1414 reply
.ret_code
= htobe32(LTTNG_OK
);
1415 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1417 ERR("Relay data quiescent control ret code failed");
1425 * Initialize a data pending command. This means that a client is about to ask
1426 * for data pending for each stream he/she holds. Simply iterate over all
1427 * streams of a session and set the data_pending_check_done flag.
1429 * This command returns to the client a LTTNG_OK code.
1432 int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1433 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1436 struct lttng_ht_iter iter
;
1437 struct lttcomm_relayd_begin_data_pending msg
;
1438 struct lttcomm_relayd_generic_reply reply
;
1439 struct relay_stream
*stream
;
1440 uint64_t session_id
;
1446 DBG("Init streams for data pending");
1448 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1449 ERR("Trying to check for data before version check");
1451 goto end_no_session
;
1454 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1455 if (ret
< sizeof(msg
)) {
1457 /* Orderly shutdown. Not necessary to print an error. */
1458 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1460 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1464 goto end_no_session
;
1467 session_id
= be64toh(msg
.session_id
);
1470 * Iterate over all streams to set the begin data pending flag. For now, the
1471 * streams are indexed by stream handle so we have to iterate over all
1472 * streams to find the one associated with the right session_id.
1475 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1476 if (stream
->session
->id
== session_id
) {
1477 stream
->data_pending_check_done
= 0;
1478 DBG("Set begin data pending flag to stream %" PRIu64
,
1479 stream
->stream_handle
);
1484 /* All good, send back reply. */
1485 reply
.ret_code
= htobe32(LTTNG_OK
);
1487 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1489 ERR("Relay begin data pending send reply failed");
1497 * End data pending command. This will check, for a given session id, if each
1498 * stream associated with it has its data_pending_check_done flag set. If not,
1499 * this means that the client lost track of the stream but the data is still
1500 * being streamed on our side. In this case, we inform the client that data is
1503 * Return to the client if there is data in flight or not with a ret_code.
1506 int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1507 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1510 struct lttng_ht_iter iter
;
1511 struct lttcomm_relayd_end_data_pending msg
;
1512 struct lttcomm_relayd_generic_reply reply
;
1513 struct relay_stream
*stream
;
1514 uint64_t session_id
;
1515 uint32_t is_data_inflight
= 0;
1521 DBG("End data pending command");
1523 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1524 ERR("Trying to check for data before version check");
1526 goto end_no_session
;
1529 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1530 if (ret
< sizeof(msg
)) {
1532 /* Orderly shutdown. Not necessary to print an error. */
1533 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1535 ERR("Relay didn't receive valid end data_pending struct size: %d",
1539 goto end_no_session
;
1542 session_id
= be64toh(msg
.session_id
);
1544 /* Iterate over all streams to see if the begin data pending flag is set. */
1546 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1547 if (stream
->session
->id
== session_id
&&
1548 !stream
->data_pending_check_done
) {
1549 is_data_inflight
= 1;
1550 DBG("Data is still in flight for stream %" PRIu64
,
1551 stream
->stream_handle
);
1557 /* All good, send back reply. */
1558 reply
.ret_code
= htobe32(is_data_inflight
);
1560 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1562 ERR("Relay end data pending send reply failed");
1570 * relay_process_control: Process the commands received on the control socket
1573 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1574 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1578 switch (be32toh(recv_hdr
->cmd
)) {
1579 case RELAYD_CREATE_SESSION
:
1580 ret
= relay_create_session(recv_hdr
, cmd
);
1582 case RELAYD_ADD_STREAM
:
1583 ret
= relay_add_stream(recv_hdr
, cmd
, streams_ht
);
1585 case RELAYD_START_DATA
:
1586 ret
= relay_start(recv_hdr
, cmd
);
1588 case RELAYD_SEND_METADATA
:
1589 ret
= relay_recv_metadata(recv_hdr
, cmd
, streams_ht
);
1591 case RELAYD_VERSION
:
1592 ret
= relay_send_version(recv_hdr
, cmd
);
1594 case RELAYD_CLOSE_STREAM
:
1595 ret
= relay_close_stream(recv_hdr
, cmd
, streams_ht
);
1597 case RELAYD_DATA_PENDING
:
1598 ret
= relay_data_pending(recv_hdr
, cmd
, streams_ht
);
1600 case RELAYD_QUIESCENT_CONTROL
:
1601 ret
= relay_quiescent_control(recv_hdr
, cmd
, streams_ht
);
1603 case RELAYD_BEGIN_DATA_PENDING
:
1604 ret
= relay_begin_data_pending(recv_hdr
, cmd
, streams_ht
);
1606 case RELAYD_END_DATA_PENDING
:
1607 ret
= relay_end_data_pending(recv_hdr
, cmd
, streams_ht
);
1609 case RELAYD_UPDATE_SYNC_INFO
:
1611 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
1612 relay_unknown_command(cmd
);
1622 * relay_process_data: Process the data received on the data socket
1625 int relay_process_data(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1628 struct relay_stream
*stream
;
1629 struct lttcomm_relayd_data_hdr data_hdr
;
1631 uint64_t net_seq_num
;
1634 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &data_hdr
,
1635 sizeof(struct lttcomm_relayd_data_hdr
), 0);
1638 /* Orderly shutdown. Not necessary to print an error. */
1639 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1641 ERR("Unable to receive data header on sock %d", cmd
->sock
->fd
);
1647 stream_id
= be64toh(data_hdr
.stream_id
);
1650 stream
= relay_stream_from_stream_id(stream_id
, streams_ht
);
1656 data_size
= be32toh(data_hdr
.data_size
);
1657 if (data_buffer_size
< data_size
) {
1660 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1661 if (!tmp_data_ptr
) {
1662 ERR("Allocating data buffer");
1667 data_buffer
= tmp_data_ptr
;
1668 data_buffer_size
= data_size
;
1670 memset(data_buffer
, 0, data_size
);
1672 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
1674 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
1675 data_size
, stream_id
, net_seq_num
);
1676 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1679 /* Orderly shutdown. Not necessary to print an error. */
1680 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1687 ret
= write(stream
->fd
, data_buffer
, data_size
);
1688 } while (ret
< 0 && errno
== EINTR
);
1689 if (ret
< 0 || ret
!= data_size
) {
1690 ERR("Relay error writing data to file");
1695 DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64
,
1696 ret
, stream
->stream_handle
);
1698 ret
= write_padding_to_file(stream
->fd
, be32toh(data_hdr
.padding_size
));
1703 stream
->prev_seq
= net_seq_num
;
1705 /* Check if we need to close the FD */
1706 if (close_stream_check(stream
)) {
1708 struct lttng_ht_iter iter
;
1710 cret
= close(stream
->fd
);
1712 PERROR("close stream process data");
1714 iter
.iter
.node
= &stream
->stream_n
.node
;
1715 ret
= lttng_ht_del(streams_ht
, &iter
);
1717 call_rcu(&stream
->rcu_node
,
1718 deferred_free_stream
);
1719 DBG("Closed tracefile %d after recv data", stream
->fd
);
1729 void relay_cleanup_poll_connection(struct lttng_poll_event
*events
, int pollfd
)
1733 lttng_poll_del(events
, pollfd
);
1735 ret
= close(pollfd
);
1737 ERR("Closing pollfd %d", pollfd
);
1742 int relay_add_connection(int fd
, struct lttng_poll_event
*events
,
1743 struct lttng_ht
*relay_connections_ht
)
1745 struct relay_command
*relay_connection
;
1748 relay_connection
= zmalloc(sizeof(struct relay_command
));
1749 if (relay_connection
== NULL
) {
1750 PERROR("Relay command zmalloc");
1754 ret
= read(fd
, relay_connection
, sizeof(struct relay_command
));
1755 } while (ret
< 0 && errno
== EINTR
);
1756 if (ret
< 0 || ret
< sizeof(struct relay_command
)) {
1757 PERROR("read relay cmd pipe");
1761 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
1762 (unsigned long) relay_connection
->sock
->fd
);
1764 lttng_ht_add_unique_ulong(relay_connections_ht
,
1765 &relay_connection
->sock_n
);
1767 return lttng_poll_add(events
,
1768 relay_connection
->sock
->fd
,
1769 LPOLLIN
| LPOLLRDHUP
);
1772 free(relay_connection
);
1778 void deferred_free_connection(struct rcu_head
*head
)
1780 struct relay_command
*relay_connection
=
1781 caa_container_of(head
, struct relay_command
, rcu_node
);
1783 lttcomm_destroy_sock(relay_connection
->sock
);
1784 free(relay_connection
);
1788 void relay_del_connection(struct lttng_ht
*relay_connections_ht
,
1789 struct lttng_ht
*streams_ht
, struct lttng_ht_iter
*iter
,
1790 struct relay_command
*relay_connection
)
1794 ret
= lttng_ht_del(relay_connections_ht
, iter
);
1796 if (relay_connection
->type
== RELAY_CONTROL
) {
1797 relay_delete_session(relay_connection
, streams_ht
);
1800 call_rcu(&relay_connection
->rcu_node
,
1801 deferred_free_connection
);
1805 * This thread does the actual work
1808 void *relay_thread_worker(void *data
)
1810 int ret
, err
= -1, last_seen_data_fd
= -1;
1812 struct relay_command
*relay_connection
;
1813 struct lttng_poll_event events
;
1814 struct lttng_ht
*relay_connections_ht
;
1815 struct lttng_ht_node_ulong
*node
;
1816 struct lttng_ht_iter iter
;
1817 struct lttng_ht
*streams_ht
;
1818 struct lttcomm_relayd_hdr recv_hdr
;
1820 DBG("[thread] Relay worker started");
1822 rcu_register_thread();
1824 /* table of connections indexed on socket */
1825 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1826 if (!relay_connections_ht
) {
1827 goto relay_connections_ht_error
;
1830 /* tables of streams indexed by stream ID */
1831 streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1833 goto streams_ht_error
;
1836 ret
= create_thread_poll_set(&events
, 2);
1838 goto error_poll_create
;
1841 ret
= lttng_poll_add(&events
, relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1848 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
1850 /* Infinite blocking call, waiting for transmission */
1851 DBG3("Relayd worker thread polling...");
1852 ret
= lttng_poll_wait(&events
, -1);
1855 * Restart interrupted system call.
1857 if (errno
== EINTR
) {
1866 * Process control. The control connection is prioritised so we don't
1867 * starve it with high throughout put tracing data on the data
1870 for (i
= 0; i
< nb_fd
; i
++) {
1871 /* Fetch once the poll data */
1872 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1873 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1875 /* Thread quit pipe has been closed. Killing thread. */
1876 ret
= check_thread_quit_pipe(pollfd
, revents
);
1882 /* Inspect the relay cmd pipe for new connection */
1883 if (pollfd
== relay_cmd_pipe
[0]) {
1884 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1885 ERR("Relay pipe error");
1887 } else if (revents
& LPOLLIN
) {
1888 DBG("Relay command received");
1889 ret
= relay_add_connection(relay_cmd_pipe
[0],
1890 &events
, relay_connections_ht
);
1895 } else if (revents
) {
1897 lttng_ht_lookup(relay_connections_ht
,
1898 (void *)((unsigned long) pollfd
),
1900 node
= lttng_ht_iter_get_node_ulong(&iter
);
1902 DBG2("Relay sock %d not found", pollfd
);
1906 relay_connection
= caa_container_of(node
,
1907 struct relay_command
, sock_n
);
1909 if (revents
& (LPOLLERR
)) {
1911 relay_cleanup_poll_connection(&events
, pollfd
);
1912 relay_del_connection(relay_connections_ht
,
1915 if (last_seen_data_fd
== pollfd
) {
1916 last_seen_data_fd
= last_notdel_data_fd
;
1918 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
1919 DBG("Socket %d hung up", pollfd
);
1920 relay_cleanup_poll_connection(&events
, pollfd
);
1921 relay_del_connection(relay_connections_ht
,
1924 if (last_seen_data_fd
== pollfd
) {
1925 last_seen_data_fd
= last_notdel_data_fd
;
1927 } else if (revents
& LPOLLIN
) {
1928 /* control socket */
1929 if (relay_connection
->type
== RELAY_CONTROL
) {
1930 ret
= relay_connection
->sock
->ops
->recvmsg(
1931 relay_connection
->sock
, &recv_hdr
,
1932 sizeof(struct lttcomm_relayd_hdr
), 0);
1933 /* connection closed */
1935 relay_cleanup_poll_connection(&events
, pollfd
);
1936 relay_del_connection(relay_connections_ht
,
1939 DBG("Control connection closed with %d", pollfd
);
1941 if (relay_connection
->session
) {
1942 DBG2("Relay worker receiving data for session : %" PRIu64
,
1943 relay_connection
->session
->id
);
1945 ret
= relay_process_control(&recv_hdr
,
1949 /* Clear the session on error. */
1950 relay_cleanup_poll_connection(&events
, pollfd
);
1951 relay_del_connection(relay_connections_ht
,
1954 DBG("Connection closed with %d", pollfd
);
1960 * Flag the last seen data fd not deleted. It will be
1961 * used as the last seen fd if any fd gets deleted in
1964 last_notdel_data_fd
= pollfd
;
1972 * The last loop handled a control request, go back to poll to make
1973 * sure we prioritise the control socket.
1979 if (last_seen_data_fd
>= 0) {
1980 for (i
= 0; i
< nb_fd
; i
++) {
1981 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1982 if (last_seen_data_fd
== pollfd
) {
1989 /* Process data connection. */
1990 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
1991 /* Fetch the poll data. */
1992 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1993 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1995 /* Skip the command pipe. It's handled in the first loop. */
1996 if (pollfd
== relay_cmd_pipe
[0]) {
2002 lttng_ht_lookup(relay_connections_ht
,
2003 (void *)((unsigned long) pollfd
),
2005 node
= lttng_ht_iter_get_node_ulong(&iter
);
2007 /* Skip it. Might be removed before. */
2011 relay_connection
= caa_container_of(node
,
2012 struct relay_command
, sock_n
);
2014 if (revents
& LPOLLIN
) {
2015 if (relay_connection
->type
!= RELAY_DATA
) {
2019 ret
= relay_process_data(relay_connection
, streams_ht
);
2020 /* connection closed */
2022 relay_cleanup_poll_connection(&events
, pollfd
);
2023 relay_del_connection(relay_connections_ht
,
2026 DBG("Data connection closed with %d", pollfd
);
2028 * Every goto restart call sets the last seen fd where
2029 * here we don't really care since we gracefully
2030 * continue the loop after the connection is deleted.
2033 /* Keep last seen port. */
2034 last_seen_data_fd
= pollfd
;
2042 last_seen_data_fd
= -1;
2047 lttng_poll_clean(&events
);
2049 /* empty the hash table and free the memory */
2051 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
2052 node
= lttng_ht_iter_get_node_ulong(&iter
);
2054 relay_connection
= caa_container_of(node
,
2055 struct relay_command
, sock_n
);
2056 relay_del_connection(relay_connections_ht
,
2063 lttng_ht_destroy(streams_ht
);
2065 lttng_ht_destroy(relay_connections_ht
);
2066 relay_connections_ht_error
:
2067 /* Close relay cmd pipes */
2068 utils_close_pipe(relay_cmd_pipe
);
2070 DBG("Thread exited with error");
2072 DBG("Worker thread cleanup complete");
2075 rcu_unregister_thread();
2080 * Create the relay command pipe to wake thread_manage_apps.
2081 * Closed in cleanup().
2083 static int create_relay_cmd_pipe(void)
2087 ret
= utils_create_pipe_cloexec(relay_cmd_pipe
);
2095 int main(int argc
, char **argv
)
2100 /* Create thread quit pipe */
2101 if ((ret
= init_thread_quit_pipe()) < 0) {
2105 /* Parse arguments */
2107 if ((ret
= parse_args(argc
, argv
)) < 0) {
2111 if ((ret
= set_signal_handler()) < 0) {
2115 /* Try to create directory if -o, --output is specified. */
2116 if (opt_output_path
) {
2117 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
);
2119 ERR("Unable to create %s", opt_output_path
);
2133 /* Check if daemon is UID = 0 */
2134 is_root
= !getuid();
2137 if (control_uri
->port
< 1024 || data_uri
->port
< 1024) {
2138 ERR("Need to be root to use ports < 1024");
2144 /* Setup the thread apps communication pipe. */
2145 if ((ret
= create_relay_cmd_pipe()) < 0) {
2149 /* Init relay command queue. */
2150 cds_wfq_init(&relay_cmd_queue
.queue
);
2152 /* Set up max poll set size */
2153 lttng_poll_set_max_size();
2155 /* Setup the dispatcher thread */
2156 ret
= pthread_create(&dispatcher_thread
, NULL
,
2157 relay_thread_dispatcher
, (void *) NULL
);
2159 PERROR("pthread_create dispatcher");
2160 goto exit_dispatcher
;
2163 /* Setup the worker thread */
2164 ret
= pthread_create(&worker_thread
, NULL
,
2165 relay_thread_worker
, (void *) NULL
);
2167 PERROR("pthread_create worker");
2171 /* Setup the listener thread */
2172 ret
= pthread_create(&listener_thread
, NULL
,
2173 relay_thread_listener
, (void *) NULL
);
2175 PERROR("pthread_create listener");
2180 ret
= pthread_join(listener_thread
, &status
);
2182 PERROR("pthread_join");
2183 goto error
; /* join error, exit without cleanup */
2187 ret
= pthread_join(worker_thread
, &status
);
2189 PERROR("pthread_join");
2190 goto error
; /* join error, exit without cleanup */
2194 ret
= pthread_join(dispatcher_thread
, &status
);
2196 PERROR("pthread_join");
2197 goto error
; /* join error, exit without cleanup */