2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
38 #include <urcu/futex.h>
39 #include <urcu/uatomic.h>
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/compat/getenv.h>
49 #include <common/defaults.h>
50 #include <common/daemonize.h>
51 #include <common/futex.h>
52 #include <common/sessiond-comm/sessiond-comm.h>
53 #include <common/sessiond-comm/inet.h>
54 #include <common/sessiond-comm/relayd.h>
55 #include <common/uri.h>
56 #include <common/utils.h>
57 #include <common/config/session-config.h>
58 #include <urcu/rculist.h>
61 #include "ctf-trace.h"
64 #include "lttng-relayd.h"
66 #include "health-relayd.h"
67 #include "testpoint.h"
68 #include "viewer-stream.h"
71 #include "connection.h"
72 #include "tracefile-array.h"
73 #include "tcp_keep_alive.h"
75 static const char *help_msg
=
76 #ifdef LTTNG_EMBED_HELP
77 #include <lttng-relayd.8.h>
83 /* command line options */
84 char *opt_output_path
;
85 static int opt_daemon
, opt_background
;
88 * We need to wait for listener and live listener threads, as well as
89 * health check thread, before being ready to signal readiness.
91 #define NR_LTTNG_RELAY_READY 3
92 static int lttng_relay_ready
= NR_LTTNG_RELAY_READY
;
94 /* Size of receive buffer. */
95 #define RECV_DATA_BUFFER_SIZE 65536
97 static int recv_child_signal
; /* Set to 1 when a SIGUSR1 signal is received. */
98 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
100 static struct lttng_uri
*control_uri
;
101 static struct lttng_uri
*data_uri
;
102 static struct lttng_uri
*live_uri
;
104 const char *progname
;
106 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
107 static int tracing_group_name_override
;
109 const char * const config_section_name
= "relayd";
112 * Quit pipe for all threads. This permits a single cancellation point
113 * for all threads when receiving an event on the pipe.
115 int thread_quit_pipe
[2] = { -1, -1 };
118 * This pipe is used to inform the worker thread that a command is queued and
119 * ready to be processed.
121 static int relay_conn_pipe
[2] = { -1, -1 };
123 /* Shared between threads */
124 static int dispatch_thread_exit
;
126 static pthread_t listener_thread
;
127 static pthread_t dispatcher_thread
;
128 static pthread_t worker_thread
;
129 static pthread_t health_thread
;
132 * last_relay_stream_id_lock protects last_relay_stream_id increment
133 * atomicity on 32-bit architectures.
135 static pthread_mutex_t last_relay_stream_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
136 static uint64_t last_relay_stream_id
;
139 * Relay command queue.
141 * The relay_thread_listener and relay_thread_dispatcher communicate with this
144 static struct relay_conn_queue relay_conn_queue
;
146 /* buffer allocated at startup, used to store the trace data */
147 static char *data_buffer
;
148 static unsigned int data_buffer_size
;
150 /* Global relay stream hash table. */
151 struct lttng_ht
*relay_streams_ht
;
153 /* Global relay viewer stream hash table. */
154 struct lttng_ht
*viewer_streams_ht
;
156 /* Global relay sessions hash table. */
157 struct lttng_ht
*sessions_ht
;
159 /* Relayd health monitoring */
160 struct health_app
*health_relayd
;
162 static struct option long_options
[] = {
163 { "control-port", 1, 0, 'C', },
164 { "data-port", 1, 0, 'D', },
165 { "live-port", 1, 0, 'L', },
166 { "daemonize", 0, 0, 'd', },
167 { "background", 0, 0, 'b', },
168 { "group", 1, 0, 'g', },
169 { "help", 0, 0, 'h', },
170 { "output", 1, 0, 'o', },
171 { "verbose", 0, 0, 'v', },
172 { "config", 1, 0, 'f' },
173 { "version", 0, 0, 'V' },
177 static const char *config_ignore_options
[] = { "help", "config", "version" };
180 * Take an option from the getopt output and set it in the right variable to be
183 * Return 0 on success else a negative value.
185 static int set_option(int opt
, const char *arg
, const char *optname
)
191 fprintf(stderr
, "option %s", optname
);
193 fprintf(stderr
, " with arg %s\n", arg
);
197 if (lttng_is_setuid_setgid()) {
198 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
199 "-C, --control-port");
201 ret
= uri_parse(arg
, &control_uri
);
203 ERR("Invalid control URI specified");
206 if (control_uri
->port
== 0) {
207 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
212 if (lttng_is_setuid_setgid()) {
213 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
216 ret
= uri_parse(arg
, &data_uri
);
218 ERR("Invalid data URI specified");
221 if (data_uri
->port
== 0) {
222 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
227 if (lttng_is_setuid_setgid()) {
228 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
231 ret
= uri_parse(arg
, &live_uri
);
233 ERR("Invalid live URI specified");
236 if (live_uri
->port
== 0) {
237 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
248 if (lttng_is_setuid_setgid()) {
249 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
252 tracing_group_name
= strdup(arg
);
253 if (tracing_group_name
== NULL
) {
258 tracing_group_name_override
= 1;
262 ret
= utils_show_help(8, "lttng-relayd", help_msg
);
264 ERR("Cannot show --help for `lttng-relayd`");
269 fprintf(stdout
, "%s\n", VERSION
);
272 if (lttng_is_setuid_setgid()) {
273 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
276 ret
= asprintf(&opt_output_path
, "%s", arg
);
279 PERROR("asprintf opt_output_path");
285 /* Verbose level can increase using multiple -v */
287 lttng_opt_verbose
= config_parse_value(arg
);
289 /* Only 3 level of verbosity (-vvv). */
290 if (lttng_opt_verbose
< 3) {
291 lttng_opt_verbose
+= 1;
296 /* Unknown option or other error.
297 * Error is printed by getopt, just return */
310 * config_entry_handler_cb used to handle options read from a config file.
311 * See config_entry_handler_cb comment in common/config/session-config.h for the
312 * return value conventions.
314 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
318 if (!entry
|| !entry
->name
|| !entry
->value
) {
323 /* Check if the option is to be ignored */
324 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
325 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
330 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1; i
++) {
331 /* Ignore if entry name is not fully matched. */
332 if (strcmp(entry
->name
, long_options
[i
].name
)) {
337 * If the option takes no argument on the command line,
338 * we have to check if the value is "true". We support
339 * non-zero numeric values, true, on and yes.
341 if (!long_options
[i
].has_arg
) {
342 ret
= config_parse_value(entry
->value
);
345 WARN("Invalid configuration value \"%s\" for option %s",
346 entry
->value
, entry
->name
);
348 /* False, skip boolean config option. */
353 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
357 WARN("Unrecognized option \"%s\" in daemon configuration file.",
364 static int set_options(int argc
, char **argv
)
366 int c
, ret
= 0, option_index
= 0, retval
= 0;
367 int orig_optopt
= optopt
, orig_optind
= optind
;
368 char *default_address
, *optstring
;
369 const char *config_path
= NULL
;
371 optstring
= utils_generate_optstring(long_options
,
372 sizeof(long_options
) / sizeof(struct option
));
378 /* Check for the --config option */
380 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
381 &option_index
)) != -1) {
385 } else if (c
!= 'f') {
389 if (lttng_is_setuid_setgid()) {
390 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
393 config_path
= utils_expand_path(optarg
);
395 ERR("Failed to resolve path: %s", optarg
);
400 ret
= config_get_section_entries(config_path
, config_section_name
,
401 config_entry_handler
, NULL
);
404 ERR("Invalid configuration option at line %i", ret
);
410 /* Reset getopt's global state */
411 optopt
= orig_optopt
;
412 optind
= orig_optind
;
414 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
419 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
426 /* assign default values */
427 if (control_uri
== NULL
) {
428 ret
= asprintf(&default_address
,
429 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS
":%d",
430 DEFAULT_NETWORK_CONTROL_PORT
);
432 PERROR("asprintf default data address");
437 ret
= uri_parse(default_address
, &control_uri
);
438 free(default_address
);
440 ERR("Invalid control URI specified");
445 if (data_uri
== NULL
) {
446 ret
= asprintf(&default_address
,
447 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS
":%d",
448 DEFAULT_NETWORK_DATA_PORT
);
450 PERROR("asprintf default data address");
455 ret
= uri_parse(default_address
, &data_uri
);
456 free(default_address
);
458 ERR("Invalid data URI specified");
463 if (live_uri
== NULL
) {
464 ret
= asprintf(&default_address
,
465 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS
":%d",
466 DEFAULT_NETWORK_VIEWER_PORT
);
468 PERROR("asprintf default viewer control address");
473 ret
= uri_parse(default_address
, &live_uri
);
474 free(default_address
);
476 ERR("Invalid viewer control URI specified");
487 static void print_global_objects(void)
489 rcu_register_thread();
491 print_viewer_streams();
492 print_relay_streams();
495 rcu_unregister_thread();
501 static void relayd_cleanup(void)
503 print_global_objects();
507 if (viewer_streams_ht
)
508 lttng_ht_destroy(viewer_streams_ht
);
509 if (relay_streams_ht
)
510 lttng_ht_destroy(relay_streams_ht
);
512 lttng_ht_destroy(sessions_ht
);
514 /* free the dynamically allocated opt_output_path */
515 free(opt_output_path
);
517 /* Close thread quit pipes */
518 utils_close_pipe(thread_quit_pipe
);
520 uri_free(control_uri
);
522 /* Live URI is freed in the live thread. */
524 if (tracing_group_name_override
) {
525 free((void *) tracing_group_name
);
530 * Write to writable pipe used to notify a thread.
532 static int notify_thread_pipe(int wpipe
)
536 ret
= lttng_write(wpipe
, "!", 1);
538 PERROR("write poll pipe");
546 static int notify_health_quit_pipe(int *pipe
)
550 ret
= lttng_write(pipe
[1], "4", 1);
552 PERROR("write relay health quit");
561 * Stop all relayd and relayd-live threads.
563 int lttng_relay_stop_threads(void)
567 /* Stopping all threads */
568 DBG("Terminating all threads");
569 if (notify_thread_pipe(thread_quit_pipe
[1])) {
570 ERR("write error on thread quit pipe");
574 if (notify_health_quit_pipe(health_quit_pipe
)) {
575 ERR("write error on health quit pipe");
578 /* Dispatch thread */
579 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
580 futex_nto1_wake(&relay_conn_queue
.futex
);
582 if (relayd_live_stop()) {
583 ERR("Error stopping live threads");
590 * Signal handler for the daemon
592 * Simply stop all worker threads, leaving main() return gracefully after
593 * joining all threads and calling cleanup().
595 static void sighandler(int sig
)
599 DBG("SIGINT caught");
600 if (lttng_relay_stop_threads()) {
601 ERR("Error stopping threads");
605 DBG("SIGTERM caught");
606 if (lttng_relay_stop_threads()) {
607 ERR("Error stopping threads");
611 CMM_STORE_SHARED(recv_child_signal
, 1);
619 * Setup signal handler for :
620 * SIGINT, SIGTERM, SIGPIPE
622 static int set_signal_handler(void)
628 if ((ret
= sigemptyset(&sigset
)) < 0) {
629 PERROR("sigemptyset");
636 sa
.sa_handler
= sighandler
;
637 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
642 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
647 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
652 sa
.sa_handler
= SIG_IGN
;
653 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
658 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
663 void lttng_relay_notify_ready(void)
665 /* Notify the parent of the fork() process that we are ready. */
666 if (opt_daemon
|| opt_background
) {
667 if (uatomic_sub_return(<tng_relay_ready
, 1) == 0) {
668 kill(child_ppid
, SIGUSR1
);
674 * Init thread quit pipe.
676 * Return -1 on error or 0 if all pipes are created.
678 static int init_thread_quit_pipe(void)
682 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
688 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
690 static int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
694 if (events
== NULL
|| size
== 0) {
699 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
705 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
717 * Check if the thread quit pipe was triggered.
719 * Return 1 if it was triggered else 0;
721 static int check_thread_quit_pipe(int fd
, uint32_t events
)
723 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
731 * Create and init socket from uri.
733 static struct lttcomm_sock
*relay_socket_create(struct lttng_uri
*uri
)
736 struct lttcomm_sock
*sock
= NULL
;
738 sock
= lttcomm_alloc_sock_from_uri(uri
);
740 ERR("Allocating socket");
744 ret
= lttcomm_create_sock(sock
);
748 DBG("Listening on sock %d", sock
->fd
);
750 ret
= sock
->ops
->bind(sock
);
755 ret
= sock
->ops
->listen(sock
, -1);
765 lttcomm_destroy_sock(sock
);
771 * This thread manages the listening for new connections on the network
773 static void *relay_thread_listener(void *data
)
775 int i
, ret
, pollfd
, err
= -1;
776 uint32_t revents
, nb_fd
;
777 struct lttng_poll_event events
;
778 struct lttcomm_sock
*control_sock
, *data_sock
;
780 DBG("[thread] Relay listener started");
782 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
784 health_code_update();
786 control_sock
= relay_socket_create(control_uri
);
788 goto error_sock_control
;
791 data_sock
= relay_socket_create(data_uri
);
793 goto error_sock_relay
;
797 * Pass 3 as size here for the thread quit pipe, control and
800 ret
= create_thread_poll_set(&events
, 3);
802 goto error_create_poll
;
805 /* Add the control socket */
806 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
811 /* Add the data socket */
812 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
817 lttng_relay_notify_ready();
819 if (testpoint(relayd_thread_listener
)) {
820 goto error_testpoint
;
824 health_code_update();
826 DBG("Listener accepting connections");
830 ret
= lttng_poll_wait(&events
, -1);
834 * Restart interrupted system call.
836 if (errno
== EINTR
) {
844 DBG("Relay new connection received");
845 for (i
= 0; i
< nb_fd
; i
++) {
846 health_code_update();
848 /* Fetch once the poll data */
849 revents
= LTTNG_POLL_GETEV(&events
, i
);
850 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
854 * No activity for this FD (poll
860 /* Thread quit pipe has been closed. Killing thread. */
861 ret
= check_thread_quit_pipe(pollfd
, revents
);
867 if (revents
& LPOLLIN
) {
869 * A new connection is requested, therefore a
870 * sessiond/consumerd connection is allocated in
871 * this thread, enqueued to a global queue and
872 * dequeued (and freed) in the worker thread.
875 struct relay_connection
*new_conn
;
876 struct lttcomm_sock
*newsock
;
877 enum connection_type type
;
879 if (pollfd
== data_sock
->fd
) {
881 newsock
= data_sock
->ops
->accept(data_sock
);
882 DBG("Relay data connection accepted, socket %d",
885 assert(pollfd
== control_sock
->fd
);
886 type
= RELAY_CONTROL
;
887 newsock
= control_sock
->ops
->accept(control_sock
);
888 DBG("Relay control connection accepted, socket %d",
892 PERROR("accepting sock");
896 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
899 PERROR("setsockopt inet");
900 lttcomm_destroy_sock(newsock
);
904 ret
= socket_apply_keep_alive_config(newsock
->fd
);
906 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
908 lttcomm_destroy_sock(newsock
);
912 new_conn
= connection_create(newsock
, type
);
914 lttcomm_destroy_sock(newsock
);
918 /* Enqueue request for the dispatcher thread. */
919 cds_wfcq_enqueue(&relay_conn_queue
.head
, &relay_conn_queue
.tail
,
923 * Wake the dispatch queue futex.
924 * Implicit memory barrier with the
925 * exchange in cds_wfcq_enqueue.
927 futex_nto1_wake(&relay_conn_queue
.futex
);
928 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
929 ERR("socket poll error");
932 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
942 lttng_poll_clean(&events
);
944 if (data_sock
->fd
>= 0) {
945 ret
= data_sock
->ops
->close(data_sock
);
950 lttcomm_destroy_sock(data_sock
);
952 if (control_sock
->fd
>= 0) {
953 ret
= control_sock
->ops
->close(control_sock
);
958 lttcomm_destroy_sock(control_sock
);
962 ERR("Health error occurred in %s", __func__
);
964 health_unregister(health_relayd
);
965 DBG("Relay listener thread cleanup complete");
966 lttng_relay_stop_threads();
971 * This thread manages the dispatching of the requests to worker threads
973 static void *relay_thread_dispatcher(void *data
)
977 struct cds_wfcq_node
*node
;
978 struct relay_connection
*new_conn
= NULL
;
980 DBG("[thread] Relay dispatcher started");
982 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
984 if (testpoint(relayd_thread_dispatcher
)) {
985 goto error_testpoint
;
988 health_code_update();
991 health_code_update();
993 /* Atomically prepare the queue futex */
994 futex_nto1_prepare(&relay_conn_queue
.futex
);
996 if (CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1001 health_code_update();
1003 /* Dequeue commands */
1004 node
= cds_wfcq_dequeue_blocking(&relay_conn_queue
.head
,
1005 &relay_conn_queue
.tail
);
1007 DBG("Woken up but nothing in the relay command queue");
1008 /* Continue thread execution */
1011 new_conn
= caa_container_of(node
, struct relay_connection
, qnode
);
1013 DBG("Dispatching request waiting on sock %d", new_conn
->sock
->fd
);
1016 * Inform worker thread of the new request. This
1017 * call is blocking so we can be assured that
1018 * the data will be read at some point in time
1019 * or wait to the end of the world :)
1021 ret
= lttng_write(relay_conn_pipe
[1], &new_conn
, sizeof(new_conn
));
1023 PERROR("write connection pipe");
1024 connection_put(new_conn
);
1027 } while (node
!= NULL
);
1029 /* Futex wait on queue. Blocking call on futex() */
1030 health_poll_entry();
1031 futex_nto1_wait(&relay_conn_queue
.futex
);
1035 /* Normal exit, no error */
1042 ERR("Health error occurred in %s", __func__
);
1044 health_unregister(health_relayd
);
1045 DBG("Dispatch thread dying");
1046 lttng_relay_stop_threads();
1051 * Set index data from the control port to a given index object.
1053 static int set_index_control_data(struct relay_index
*index
,
1054 struct lttcomm_relayd_index
*data
,
1055 struct relay_connection
*conn
)
1057 struct ctf_packet_index index_data
;
1060 * The index on disk is encoded in big endian, so we don't need
1061 * to convert the data received on the network. The data_offset
1062 * value is NEVER modified here and is updated by the data
1065 index_data
.packet_size
= data
->packet_size
;
1066 index_data
.content_size
= data
->content_size
;
1067 index_data
.timestamp_begin
= data
->timestamp_begin
;
1068 index_data
.timestamp_end
= data
->timestamp_end
;
1069 index_data
.events_discarded
= data
->events_discarded
;
1070 index_data
.stream_id
= data
->stream_id
;
1072 if (conn
->minor
>= 8) {
1073 index
->index_data
.stream_instance_id
= data
->stream_instance_id
;
1074 index
->index_data
.packet_seq_num
= data
->packet_seq_num
;
1077 return relay_index_set_data(index
, &index_data
);
1081 * Handle the RELAYD_CREATE_SESSION command.
1083 * On success, send back the session id or else return a negative value.
1085 static int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
1086 struct relay_connection
*conn
)
1088 int ret
= 0, send_ret
;
1089 struct relay_session
*session
;
1090 struct lttcomm_relayd_status_session reply
;
1091 char session_name
[LTTNG_NAME_MAX
];
1092 char hostname
[LTTNG_HOST_NAME_MAX
];
1093 uint32_t live_timer
= 0;
1094 bool snapshot
= false;
1096 memset(session_name
, 0, LTTNG_NAME_MAX
);
1097 memset(hostname
, 0, LTTNG_HOST_NAME_MAX
);
1099 memset(&reply
, 0, sizeof(reply
));
1101 switch (conn
->minor
) {
1106 case 4: /* LTTng sessiond 2.4 */
1108 ret
= cmd_create_session_2_4(conn
, session_name
,
1109 hostname
, &live_timer
, &snapshot
);
1115 session
= session_create(session_name
, hostname
, live_timer
,
1116 snapshot
, conn
->major
, conn
->minor
);
1121 assert(!conn
->session
);
1122 conn
->session
= session
;
1123 DBG("Created session %" PRIu64
, session
->id
);
1125 reply
.session_id
= htobe64(session
->id
);
1129 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1131 reply
.ret_code
= htobe32(LTTNG_OK
);
1134 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1136 ERR("Relayd sending session id");
1144 * When we have received all the streams and the metadata for a channel,
1145 * we make them visible to the viewer threads.
1147 static void publish_connection_local_streams(struct relay_connection
*conn
)
1149 struct relay_stream
*stream
;
1150 struct relay_session
*session
= conn
->session
;
1153 * We publish all streams belonging to a session atomically wrt
1156 pthread_mutex_lock(&session
->lock
);
1158 cds_list_for_each_entry_rcu(stream
, &session
->recv_list
,
1160 stream_publish(stream
);
1165 * Inform the viewer that there are new streams in the session.
1167 if (session
->viewer_attached
) {
1168 uatomic_set(&session
->new_streams
, 1);
1170 pthread_mutex_unlock(&session
->lock
);
1174 * relay_add_stream: allocate a new stream for a session
1176 static int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1177 struct relay_connection
*conn
)
1181 struct relay_session
*session
= conn
->session
;
1182 struct relay_stream
*stream
= NULL
;
1183 struct lttcomm_relayd_status_stream reply
;
1184 struct ctf_trace
*trace
= NULL
;
1185 uint64_t stream_handle
= -1ULL;
1186 char *path_name
= NULL
, *channel_name
= NULL
;
1187 uint64_t tracefile_size
= 0, tracefile_count
= 0;
1189 if (!session
|| conn
->version_check_done
== 0) {
1190 ERR("Trying to add a stream before version check");
1192 goto end_no_session
;
1195 switch (session
->minor
) {
1196 case 1: /* LTTng sessiond 2.1. Allocates path_name and channel_name. */
1197 ret
= cmd_recv_stream_2_1(conn
, &path_name
,
1200 case 2: /* LTTng sessiond 2.2. Allocates path_name and channel_name. */
1202 ret
= cmd_recv_stream_2_2(conn
, &path_name
,
1203 &channel_name
, &tracefile_size
, &tracefile_count
);
1210 trace
= ctf_trace_get_by_path_or_create(session
, path_name
);
1214 /* This stream here has one reference on the trace. */
1216 pthread_mutex_lock(&last_relay_stream_id_lock
);
1217 stream_handle
= ++last_relay_stream_id
;
1218 pthread_mutex_unlock(&last_relay_stream_id_lock
);
1220 /* We pass ownership of path_name and channel_name. */
1221 stream
= stream_create(trace
, stream_handle
, path_name
,
1222 channel_name
, tracefile_size
, tracefile_count
);
1224 channel_name
= NULL
;
1227 * Streams are the owners of their trace. Reference to trace is
1228 * kept within stream_create().
1230 ctf_trace_put(trace
);
1233 memset(&reply
, 0, sizeof(reply
));
1234 reply
.handle
= htobe64(stream_handle
);
1236 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1238 reply
.ret_code
= htobe32(LTTNG_OK
);
1241 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1242 sizeof(struct lttcomm_relayd_status_stream
), 0);
1244 ERR("Relay sending stream id");
1245 ret
= (int) send_ret
;
1255 * relay_close_stream: close a specific stream
1257 static int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1258 struct relay_connection
*conn
)
1261 struct relay_session
*session
= conn
->session
;
1262 struct lttcomm_relayd_close_stream stream_info
;
1263 struct lttcomm_relayd_generic_reply reply
;
1264 struct relay_stream
*stream
;
1266 DBG("Close stream received");
1268 if (!session
|| conn
->version_check_done
== 0) {
1269 ERR("Trying to close a stream before version check");
1271 goto end_no_session
;
1274 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &stream_info
,
1275 sizeof(struct lttcomm_relayd_close_stream
), 0);
1276 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1278 /* Orderly shutdown. Not necessary to print an error. */
1279 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1281 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1284 goto end_no_session
;
1287 stream
= stream_get_by_id(be64toh(stream_info
.stream_id
));
1294 * Set last_net_seq_num before the close flag. Required by data
1297 pthread_mutex_lock(&stream
->lock
);
1298 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1299 pthread_mutex_unlock(&stream
->lock
);
1302 * This is one of the conditions which may trigger a stream close
1303 * with the others being:
1304 * 1) A close command is received for a stream
1305 * 2) The control connection owning the stream is closed
1306 * 3) We have received all of the stream's data _after_ a close
1309 try_stream_close(stream
);
1310 if (stream
->is_metadata
) {
1311 struct relay_viewer_stream
*vstream
;
1313 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
1315 if (vstream
->metadata_sent
== stream
->metadata_received
) {
1317 * Since all the metadata has been sent to the
1318 * viewer and that we have a request to close
1319 * its stream, we can safely teardown the
1320 * corresponding metadata viewer stream.
1322 viewer_stream_put(vstream
);
1324 /* Put local reference. */
1325 viewer_stream_put(vstream
);
1331 memset(&reply
, 0, sizeof(reply
));
1333 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1335 reply
.ret_code
= htobe32(LTTNG_OK
);
1337 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1338 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1340 ERR("Relay sending stream id");
1349 * relay_reset_metadata: reset a metadata stream
1352 int relay_reset_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1353 struct relay_connection
*conn
)
1356 struct relay_session
*session
= conn
->session
;
1357 struct lttcomm_relayd_reset_metadata stream_info
;
1358 struct lttcomm_relayd_generic_reply reply
;
1359 struct relay_stream
*stream
;
1361 DBG("Reset metadata received");
1363 if (!session
|| conn
->version_check_done
== 0) {
1364 ERR("Trying to reset a metadata stream before version check");
1366 goto end_no_session
;
1369 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &stream_info
,
1370 sizeof(struct lttcomm_relayd_reset_metadata
), 0);
1371 if (ret
< sizeof(struct lttcomm_relayd_reset_metadata
)) {
1373 /* Orderly shutdown. Not necessary to print an error. */
1374 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1376 ERR("Relay didn't receive valid reset_metadata struct "
1380 goto end_no_session
;
1382 DBG("Update metadata to version %" PRIu64
, be64toh(stream_info
.version
));
1384 /* Unsupported for live sessions for now. */
1385 if (session
->live_timer
!= 0) {
1390 stream
= stream_get_by_id(be64toh(stream_info
.stream_id
));
1395 pthread_mutex_lock(&stream
->lock
);
1396 if (!stream
->is_metadata
) {
1401 ret
= utils_rotate_stream_file(stream
->path_name
, stream
->channel_name
,
1402 0, 0, -1, -1, stream
->stream_fd
->fd
, NULL
,
1403 &stream
->stream_fd
->fd
);
1405 ERR("Failed to rotate metadata file %s of channel %s",
1406 stream
->path_name
, stream
->channel_name
);
1411 pthread_mutex_unlock(&stream
->lock
);
1415 memset(&reply
, 0, sizeof(reply
));
1417 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1419 reply
.ret_code
= htobe32(LTTNG_OK
);
1421 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1422 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1424 ERR("Relay sending reset metadata reply");
1433 * relay_unknown_command: send -1 if received unknown command
1435 static void relay_unknown_command(struct relay_connection
*conn
)
1437 struct lttcomm_relayd_generic_reply reply
;
1440 memset(&reply
, 0, sizeof(reply
));
1441 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1442 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1443 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1445 ERR("Relay sending unknown command");
1450 * relay_start: send an acknowledgment to the client to tell if we are
1451 * ready to receive data. We are ready if a session is established.
1453 static int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1454 struct relay_connection
*conn
)
1456 int ret
= htobe32(LTTNG_OK
);
1457 struct lttcomm_relayd_generic_reply reply
;
1458 struct relay_session
*session
= conn
->session
;
1461 DBG("Trying to start the streaming without a session established");
1462 ret
= htobe32(LTTNG_ERR_UNK
);
1465 memset(&reply
, 0, sizeof(reply
));
1466 reply
.ret_code
= ret
;
1467 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1468 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1470 ERR("Relay sending start ack");
1477 * Append padding to the file pointed by the file descriptor fd.
1479 static int write_padding_to_file(int fd
, uint32_t size
)
1488 zeros
= zmalloc(size
);
1489 if (zeros
== NULL
) {
1490 PERROR("zmalloc zeros for padding");
1495 ret
= lttng_write(fd
, zeros
, size
);
1497 PERROR("write padding to file");
1507 * relay_recv_metadata: receive the metadata for the session.
1509 static int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1510 struct relay_connection
*conn
)
1514 struct relay_session
*session
= conn
->session
;
1515 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1516 struct relay_stream
*metadata_stream
;
1517 uint64_t data_size
, payload_size
;
1520 ERR("Metadata sent before version check");
1525 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1526 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1527 ERR("Incorrect data size");
1531 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1533 if (data_buffer_size
< data_size
) {
1534 /* In case the realloc fails, we can free the memory */
1537 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1538 if (!tmp_data_ptr
) {
1539 ERR("Allocating data buffer");
1544 data_buffer
= tmp_data_ptr
;
1545 data_buffer_size
= data_size
;
1547 memset(data_buffer
, 0, data_size
);
1548 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1549 size_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, data_size
, 0);
1550 if (size_ret
< 0 || size_ret
!= data_size
) {
1551 if (size_ret
== 0) {
1552 /* Orderly shutdown. Not necessary to print an error. */
1553 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1555 ERR("Relay didn't receive the whole metadata");
1560 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1562 metadata_stream
= stream_get_by_id(be64toh(metadata_struct
->stream_id
));
1563 if (!metadata_stream
) {
1568 pthread_mutex_lock(&metadata_stream
->lock
);
1570 size_ret
= lttng_write(metadata_stream
->stream_fd
->fd
, metadata_struct
->payload
,
1572 if (size_ret
< payload_size
) {
1573 ERR("Relay error writing metadata on file");
1578 size_ret
= write_padding_to_file(metadata_stream
->stream_fd
->fd
,
1579 be32toh(metadata_struct
->padding_size
));
1584 metadata_stream
->metadata_received
+=
1585 payload_size
+ be32toh(metadata_struct
->padding_size
);
1586 DBG2("Relay metadata written. Updated metadata_received %" PRIu64
,
1587 metadata_stream
->metadata_received
);
1590 pthread_mutex_unlock(&metadata_stream
->lock
);
1591 stream_put(metadata_stream
);
1597 * relay_send_version: send relayd version number
1599 static int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1600 struct relay_connection
*conn
)
1603 struct lttcomm_relayd_version reply
, msg
;
1604 bool compatible
= true;
1606 conn
->version_check_done
= 1;
1608 /* Get version from the other side. */
1609 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1610 if (ret
< 0 || ret
!= sizeof(msg
)) {
1612 /* Orderly shutdown. Not necessary to print an error. */
1613 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1615 ERR("Relay failed to receive the version values.");
1621 memset(&reply
, 0, sizeof(reply
));
1622 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1623 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1625 /* Major versions must be the same */
1626 if (reply
.major
!= be32toh(msg
.major
)) {
1627 DBG("Incompatible major versions (%u vs %u), deleting session",
1628 reply
.major
, be32toh(msg
.major
));
1632 conn
->major
= reply
.major
;
1633 /* We adapt to the lowest compatible version */
1634 if (reply
.minor
<= be32toh(msg
.minor
)) {
1635 conn
->minor
= reply
.minor
;
1637 conn
->minor
= be32toh(msg
.minor
);
1640 reply
.major
= htobe32(reply
.major
);
1641 reply
.minor
= htobe32(reply
.minor
);
1642 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1643 sizeof(struct lttcomm_relayd_version
), 0);
1645 ERR("Relay sending version");
1653 DBG("Version check done using protocol %u.%u", conn
->major
,
1661 * Check for data pending for a given stream id from the session daemon.
1663 static int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1664 struct relay_connection
*conn
)
1666 struct relay_session
*session
= conn
->session
;
1667 struct lttcomm_relayd_data_pending msg
;
1668 struct lttcomm_relayd_generic_reply reply
;
1669 struct relay_stream
*stream
;
1671 uint64_t last_net_seq_num
, stream_id
;
1673 DBG("Data pending command received");
1675 if (!session
|| conn
->version_check_done
== 0) {
1676 ERR("Trying to check for data before version check");
1678 goto end_no_session
;
1681 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1682 if (ret
< sizeof(msg
)) {
1684 /* Orderly shutdown. Not necessary to print an error. */
1685 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1687 ERR("Relay didn't receive valid data_pending struct size : %d",
1691 goto end_no_session
;
1694 stream_id
= be64toh(msg
.stream_id
);
1695 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1697 stream
= stream_get_by_id(stream_id
);
1698 if (stream
== NULL
) {
1703 pthread_mutex_lock(&stream
->lock
);
1705 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1706 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1709 /* Avoid wrapping issue */
1710 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1711 /* Data has in fact been written and is NOT pending */
1714 /* Data still being streamed thus pending */
1718 stream
->data_pending_check_done
= true;
1719 pthread_mutex_unlock(&stream
->lock
);
1724 memset(&reply
, 0, sizeof(reply
));
1725 reply
.ret_code
= htobe32(ret
);
1726 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1728 ERR("Relay data pending ret code failed");
1736 * Wait for the control socket to reach a quiescent state.
1738 * Note that for now, when receiving this command from the session
1739 * daemon, this means that every subsequent commands or data received on
1740 * the control socket has been handled. So, this is why we simply return
1743 static int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1744 struct relay_connection
*conn
)
1748 struct relay_stream
*stream
;
1749 struct lttcomm_relayd_quiescent_control msg
;
1750 struct lttcomm_relayd_generic_reply reply
;
1752 DBG("Checking quiescent state on control socket");
1754 if (!conn
->session
|| conn
->version_check_done
== 0) {
1755 ERR("Trying to check for data before version check");
1757 goto end_no_session
;
1760 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1761 if (ret
< sizeof(msg
)) {
1763 /* Orderly shutdown. Not necessary to print an error. */
1764 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1766 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1770 goto end_no_session
;
1773 stream_id
= be64toh(msg
.stream_id
);
1774 stream
= stream_get_by_id(stream_id
);
1778 pthread_mutex_lock(&stream
->lock
);
1779 stream
->data_pending_check_done
= true;
1780 pthread_mutex_unlock(&stream
->lock
);
1781 DBG("Relay quiescent control pending flag set to %" PRIu64
, stream_id
);
1784 memset(&reply
, 0, sizeof(reply
));
1785 reply
.ret_code
= htobe32(LTTNG_OK
);
1786 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1788 ERR("Relay data quiescent control ret code failed");
1796 * Initialize a data pending command. This means that a consumer is about
1797 * to ask for data pending for each stream it holds. Simply iterate over
1798 * all streams of a session and set the data_pending_check_done flag.
1800 * This command returns to the client a LTTNG_OK code.
1802 static int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1803 struct relay_connection
*conn
)
1806 struct lttng_ht_iter iter
;
1807 struct lttcomm_relayd_begin_data_pending msg
;
1808 struct lttcomm_relayd_generic_reply reply
;
1809 struct relay_stream
*stream
;
1810 uint64_t session_id
;
1815 DBG("Init streams for data pending");
1817 if (!conn
->session
|| conn
->version_check_done
== 0) {
1818 ERR("Trying to check for data before version check");
1820 goto end_no_session
;
1823 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1824 if (ret
< sizeof(msg
)) {
1826 /* Orderly shutdown. Not necessary to print an error. */
1827 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1829 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1833 goto end_no_session
;
1836 session_id
= be64toh(msg
.session_id
);
1839 * Iterate over all streams to set the begin data pending flag.
1840 * For now, the streams are indexed by stream handle so we have
1841 * to iterate over all streams to find the one associated with
1842 * the right session_id.
1845 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1847 if (!stream_get(stream
)) {
1850 if (stream
->trace
->session
->id
== session_id
) {
1851 pthread_mutex_lock(&stream
->lock
);
1852 stream
->data_pending_check_done
= false;
1853 pthread_mutex_unlock(&stream
->lock
);
1854 DBG("Set begin data pending flag to stream %" PRIu64
,
1855 stream
->stream_handle
);
1861 memset(&reply
, 0, sizeof(reply
));
1862 /* All good, send back reply. */
1863 reply
.ret_code
= htobe32(LTTNG_OK
);
1865 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1867 ERR("Relay begin data pending send reply failed");
1875 * End data pending command. This will check, for a given session id, if
1876 * each stream associated with it has its data_pending_check_done flag
1877 * set. If not, this means that the client lost track of the stream but
1878 * the data is still being streamed on our side. In this case, we inform
1879 * the client that data is in flight.
1881 * Return to the client if there is data in flight or not with a ret_code.
1883 static int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1884 struct relay_connection
*conn
)
1887 struct lttng_ht_iter iter
;
1888 struct lttcomm_relayd_end_data_pending msg
;
1889 struct lttcomm_relayd_generic_reply reply
;
1890 struct relay_stream
*stream
;
1891 uint64_t session_id
;
1892 uint32_t is_data_inflight
= 0;
1894 DBG("End data pending command");
1896 if (!conn
->session
|| conn
->version_check_done
== 0) {
1897 ERR("Trying to check for data before version check");
1899 goto end_no_session
;
1902 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1903 if (ret
< sizeof(msg
)) {
1905 /* Orderly shutdown. Not necessary to print an error. */
1906 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1908 ERR("Relay didn't receive valid end data_pending struct size: %d",
1912 goto end_no_session
;
1915 session_id
= be64toh(msg
.session_id
);
1918 * Iterate over all streams to see if the begin data pending
1922 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1924 if (!stream_get(stream
)) {
1927 if (stream
->trace
->session
->id
!= session_id
) {
1931 pthread_mutex_lock(&stream
->lock
);
1932 if (!stream
->data_pending_check_done
) {
1933 if (!stream
->closed
|| !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
1934 is_data_inflight
= 1;
1935 DBG("Data is still in flight for stream %" PRIu64
,
1936 stream
->stream_handle
);
1937 pthread_mutex_unlock(&stream
->lock
);
1942 pthread_mutex_unlock(&stream
->lock
);
1947 memset(&reply
, 0, sizeof(reply
));
1948 /* All good, send back reply. */
1949 reply
.ret_code
= htobe32(is_data_inflight
);
1951 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1953 ERR("Relay end data pending send reply failed");
1961 * Receive an index for a specific stream.
1963 * Return 0 on success else a negative value.
1965 static int relay_recv_index(struct lttcomm_relayd_hdr
*recv_hdr
,
1966 struct relay_connection
*conn
)
1969 struct relay_session
*session
= conn
->session
;
1970 struct lttcomm_relayd_index index_info
;
1971 struct relay_index
*index
;
1972 struct lttcomm_relayd_generic_reply reply
;
1973 struct relay_stream
*stream
;
1974 uint64_t net_seq_num
;
1979 DBG("Relay receiving index");
1981 if (!session
|| conn
->version_check_done
== 0) {
1982 ERR("Trying to close a stream before version check");
1984 goto end_no_session
;
1987 msg_len
= lttcomm_relayd_index_len(
1988 lttng_to_index_major(conn
->major
, conn
->minor
),
1989 lttng_to_index_minor(conn
->major
, conn
->minor
));
1990 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &index_info
,
1992 if (ret
< msg_len
) {
1994 /* Orderly shutdown. Not necessary to print an error. */
1995 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1997 ERR("Relay didn't receive valid index struct size : %d", ret
);
2000 goto end_no_session
;
2003 net_seq_num
= be64toh(index_info
.net_seq_num
);
2005 stream
= stream_get_by_id(be64toh(index_info
.relay_stream_id
));
2007 ERR("stream_get_by_id not found");
2011 pthread_mutex_lock(&stream
->lock
);
2013 /* Live beacon handling */
2014 if (index_info
.packet_size
== 0) {
2015 DBG("Received live beacon for stream %" PRIu64
,
2016 stream
->stream_handle
);
2019 * Only flag a stream inactive when it has already
2020 * received data and no indexes are in flight.
2022 if (stream
->index_received_seqcount
> 0
2023 && stream
->indexes_in_flight
== 0) {
2024 stream
->beacon_ts_end
=
2025 be64toh(index_info
.timestamp_end
);
2028 goto end_stream_put
;
2030 stream
->beacon_ts_end
= -1ULL;
2033 if (stream
->ctf_stream_id
== -1ULL) {
2034 stream
->ctf_stream_id
= be64toh(index_info
.stream_id
);
2036 index
= relay_index_get_by_id_or_create(stream
, net_seq_num
);
2039 ERR("relay_index_get_by_id_or_create index NULL");
2040 goto end_stream_put
;
2042 if (set_index_control_data(index
, &index_info
, conn
)) {
2043 ERR("set_index_control_data error");
2044 relay_index_put(index
);
2046 goto end_stream_put
;
2048 ret
= relay_index_try_flush(index
);
2050 tracefile_array_commit_seq(stream
->tfa
);
2051 stream
->index_received_seqcount
++;
2052 } else if (ret
> 0) {
2056 ERR("relay_index_try_flush error %d", ret
);
2057 relay_index_put(index
);
2062 pthread_mutex_unlock(&stream
->lock
);
2067 memset(&reply
, 0, sizeof(reply
));
2069 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2071 reply
.ret_code
= htobe32(LTTNG_OK
);
2073 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2075 ERR("Relay sending close index id reply");
2084 * Receive the streams_sent message.
2086 * Return 0 on success else a negative value.
2088 static int relay_streams_sent(struct lttcomm_relayd_hdr
*recv_hdr
,
2089 struct relay_connection
*conn
)
2092 struct lttcomm_relayd_generic_reply reply
;
2096 DBG("Relay receiving streams_sent");
2098 if (!conn
->session
|| conn
->version_check_done
== 0) {
2099 ERR("Trying to close a stream before version check");
2101 goto end_no_session
;
2105 * Publish every pending stream in the connection recv list which are
2106 * now ready to be used by the viewer.
2108 publish_connection_local_streams(conn
);
2110 memset(&reply
, 0, sizeof(reply
));
2111 reply
.ret_code
= htobe32(LTTNG_OK
);
2112 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2114 ERR("Relay sending sent_stream reply");
2126 * relay_mkdir: Create a folder on the disk.
2128 static int relay_mkdir(struct lttcomm_relayd_hdr
*recv_hdr
,
2129 struct relay_connection
*conn
)
2132 ssize_t network_ret
;
2133 struct relay_session
*session
= conn
->session
;
2134 struct lttcomm_relayd_mkdir path_info_header
;
2135 struct lttcomm_relayd_mkdir
*path_info
= NULL
;
2136 struct lttcomm_relayd_generic_reply reply
;
2139 if (!session
|| !conn
->version_check_done
) {
2140 ERR("Trying to create a directory before version check");
2142 goto end_no_session
;
2145 if (session
->major
== 2 && session
->minor
< 11) {
2147 * This client is not supposed to use this command since
2148 * it predates its introduction.
2150 ERR("relay_mkdir command is unsupported before LTTng 2.11");
2152 goto end_no_session
;
2155 network_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &path_info_header
,
2156 sizeof(path_info_header
), 0);
2157 if (network_ret
< (ssize_t
) sizeof(path_info_header
)) {
2158 if (network_ret
== 0) {
2159 /* Orderly shutdown. Not necessary to print an error. */
2160 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2162 ERR("Reception of mkdir command argument length failed with ret = %zi, expected %zu",
2163 network_ret
, sizeof(path_info_header
));
2166 goto end_no_session
;
2169 path_info_header
.length
= be32toh(path_info_header
.length
);
2171 /* Ensure that it fits in local path length. */
2172 if (path_info_header
.length
>= LTTNG_PATH_MAX
) {
2173 ret
= -ENAMETOOLONG
;
2174 ERR("Path name argument of mkdir command (%" PRIu32
" bytes) exceeds the maximal length allowed (%d bytes)",
2175 path_info_header
.length
, LTTNG_PATH_MAX
);
2179 path_info
= zmalloc(sizeof(path_info_header
) + path_info_header
.length
);
2181 PERROR("zmalloc of mkdir command path");
2186 network_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, path_info
->path
,
2187 path_info_header
.length
, 0);
2188 if (network_ret
< (ssize_t
) path_info_header
.length
) {
2189 if (network_ret
== 0) {
2190 /* Orderly shutdown. Not necessary to print an error. */
2191 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2193 ERR("Reception of mkdir path argument failed with ret = %zi, expected %" PRIu32
,
2194 network_ret
, path_info_header
.length
);
2197 goto end_no_session
;
2200 path
= create_output_path(path_info
->path
);
2202 ERR("Failed to create output path");
2207 ret
= utils_mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, -1, -1);
2209 ERR("relay creating output directory");
2216 memset(&reply
, 0, sizeof(reply
));
2218 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2220 reply
.ret_code
= htobe32(LTTNG_OK
);
2222 network_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
2223 sizeof(struct lttcomm_relayd_generic_reply
), 0);
2224 if (network_ret
< (ssize_t
) sizeof(struct lttcomm_relayd_generic_reply
)) {
2225 ERR("Failed to send mkdir command status code with ret = %zi, expected %zu",
2227 sizeof(struct lttcomm_relayd_generic_reply
));
2237 static int validate_rotate_rename_path_length(const char *path_type
,
2238 uint32_t path_length
)
2242 if (path_length
> LTTNG_PATH_MAX
) {
2243 ret
= -ENAMETOOLONG
;
2244 ERR("rotate rename \"%s\" path name length (%" PRIu32
" bytes) exceeds the allowed size of %i bytes",
2245 path_type
, path_length
, LTTNG_PATH_MAX
);
2246 } else if (path_length
== 0) {
2248 ERR("rotate rename \"%s\" path name has an illegal length of 0", path_type
);
2254 * relay_rotate_rename: rename the trace folder after a rotation is
2255 * completed. We are not closing any fd here, just moving the folder, so it
2256 * works even if data is still in-flight.
2258 static int relay_rotate_rename(struct lttcomm_relayd_hdr
*recv_hdr
,
2259 struct relay_connection
*conn
)
2262 ssize_t network_ret
;
2263 struct relay_session
*session
= conn
->session
;
2264 struct lttcomm_relayd_generic_reply reply
;
2265 struct lttcomm_relayd_rotate_rename header
;
2266 char *received_paths
= NULL
;
2267 size_t received_paths_size
;
2268 const char *received_old_path
, *received_new_path
;
2269 char *complete_old_path
= NULL
, *complete_new_path
= NULL
;
2271 if (!session
|| !conn
->version_check_done
) {
2272 ERR("Trying to rename a trace folder before version check");
2277 if (session
->major
== 2 && session
->minor
< 11) {
2278 ERR("relay_rotate_rename command is unsupported before LTTng 2.11");
2283 network_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &header
,
2285 if (network_ret
< (ssize_t
) sizeof(header
)) {
2286 if (network_ret
== 0) {
2287 /* Orderly shutdown. Not necessary to print an error. */
2288 DBG("Socket %d did an orderly shutdown",
2291 ERR("Relay didn't receive a valid rotate_rename command header: expected %zu bytes, recvmsg() returned %zi",
2292 sizeof(header
), network_ret
);
2298 header
.old_path_length
= be32toh(header
.old_path_length
);
2299 header
.new_path_length
= be32toh(header
.new_path_length
);
2300 received_paths_size
= header
.old_path_length
+ header
.new_path_length
;
2302 /* Ensure the paths don't exceed their allowed size. */
2303 ret
= validate_rotate_rename_path_length("old", header
.old_path_length
);
2307 ret
= validate_rotate_rename_path_length("new", header
.new_path_length
);
2312 received_paths
= zmalloc(received_paths_size
);
2313 if (!received_paths
) {
2314 PERROR("Could not allocate rotate commands paths reception buffer");
2319 network_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, received_paths
,
2320 received_paths_size
, 0);
2321 if (network_ret
< (ssize_t
) received_paths_size
) {
2322 if (network_ret
== 0) {
2323 /* Orderly shutdown. Not necessary to print an error. */
2324 DBG("Socket %d did an orderly shutdown",
2327 ERR("Relay failed to received rename command paths (%zu bytes): recvmsg() returned %zi",
2328 received_paths_size
, network_ret
);
2334 /* Validate that both paths received are NULL terminated. */
2335 if (received_paths
[header
.old_path_length
- 1] != '\0') {
2336 ERR("relay_rotate_rename command's \"old\" path is invalid (not NULL terminated)");
2340 if (received_paths
[received_paths_size
- 1] != '\0') {
2341 ERR("relay_rotate_rename command's \"new\" path is invalid (not NULL terminated)");
2346 received_old_path
= received_paths
;
2347 received_new_path
= received_paths
+ header
.old_path_length
;
2349 complete_old_path
= create_output_path(received_old_path
);
2350 if (!complete_old_path
) {
2351 ERR("Failed to build old output path in rotate_rename command");
2356 complete_new_path
= create_output_path(received_new_path
);
2357 if (!complete_new_path
) {
2358 ERR("Failed to build new output path in rotate_rename command");
2363 ret
= utils_mkdir_recursive(complete_new_path
, S_IRWXU
| S_IRWXG
,
2366 ERR("Failed to mkdir() rotate_rename's \"new\" output directory at \"%s\"",
2372 * If a domain has not yet created its channel, the domain-specific
2373 * folder might not exist, but this is not an error.
2375 ret
= rename(complete_old_path
, complete_new_path
);
2376 if (ret
< 0 && errno
!= ENOENT
) {
2377 PERROR("Renaming chunk in rotate_rename command from \"%s\" to \"%s\"",
2378 complete_old_path
, complete_new_path
);
2384 memset(&reply
, 0, sizeof(reply
));
2386 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2388 reply
.ret_code
= htobe32(LTTNG_OK
);
2390 network_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
2391 sizeof(struct lttcomm_relayd_generic_reply
), 0);
2392 if (network_ret
< sizeof(struct lttcomm_relayd_generic_reply
)) {
2393 ERR("Relay sending stream id");
2398 free(received_paths
);
2399 free(complete_old_path
);
2400 free(complete_new_path
);
2405 * Process the commands received on the control socket
2407 static int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
2408 struct relay_connection
*conn
)
2412 switch (be32toh(recv_hdr
->cmd
)) {
2413 case RELAYD_CREATE_SESSION
:
2414 ret
= relay_create_session(recv_hdr
, conn
);
2416 case RELAYD_ADD_STREAM
:
2417 ret
= relay_add_stream(recv_hdr
, conn
);
2419 case RELAYD_START_DATA
:
2420 ret
= relay_start(recv_hdr
, conn
);
2422 case RELAYD_SEND_METADATA
:
2423 ret
= relay_recv_metadata(recv_hdr
, conn
);
2425 case RELAYD_VERSION
:
2426 ret
= relay_send_version(recv_hdr
, conn
);
2428 case RELAYD_CLOSE_STREAM
:
2429 ret
= relay_close_stream(recv_hdr
, conn
);
2431 case RELAYD_DATA_PENDING
:
2432 ret
= relay_data_pending(recv_hdr
, conn
);
2434 case RELAYD_QUIESCENT_CONTROL
:
2435 ret
= relay_quiescent_control(recv_hdr
, conn
);
2437 case RELAYD_BEGIN_DATA_PENDING
:
2438 ret
= relay_begin_data_pending(recv_hdr
, conn
);
2440 case RELAYD_END_DATA_PENDING
:
2441 ret
= relay_end_data_pending(recv_hdr
, conn
);
2443 case RELAYD_SEND_INDEX
:
2444 ret
= relay_recv_index(recv_hdr
, conn
);
2446 case RELAYD_STREAMS_SENT
:
2447 ret
= relay_streams_sent(recv_hdr
, conn
);
2449 case RELAYD_RESET_METADATA
:
2450 ret
= relay_reset_metadata(recv_hdr
, conn
);
2452 case RELAYD_ROTATE_RENAME
:
2453 ret
= relay_rotate_rename(recv_hdr
, conn
);
2456 ret
= relay_mkdir(recv_hdr
, conn
);
2458 case RELAYD_UPDATE_SYNC_INFO
:
2460 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
2461 relay_unknown_command(conn
);
2471 * Handle index for a data stream.
2473 * Called with the stream lock held.
2475 * Return 0 on success else a negative value.
2477 static int handle_index_data(struct relay_stream
*stream
, uint64_t net_seq_num
,
2481 uint64_t data_offset
;
2482 struct relay_index
*index
;
2484 /* Get data offset because we are about to update the index. */
2485 data_offset
= htobe64(stream
->tracefile_size_current
);
2487 DBG("handle_index_data: stream %" PRIu64
" net_seq_num %" PRIu64
" data offset %" PRIu64
,
2488 stream
->stream_handle
, net_seq_num
, stream
->tracefile_size_current
);
2491 * Lookup for an existing index for that stream id/sequence
2492 * number. If it exists, the control thread has already received the
2493 * data for it, thus we need to write it to disk.
2495 index
= relay_index_get_by_id_or_create(stream
, net_seq_num
);
2501 if (rotate_index
|| !stream
->index_file
) {
2502 uint32_t major
, minor
;
2504 /* Put ref on previous index_file. */
2505 if (stream
->index_file
) {
2506 lttng_index_file_put(stream
->index_file
);
2507 stream
->index_file
= NULL
;
2509 major
= stream
->trace
->session
->major
;
2510 minor
= stream
->trace
->session
->minor
;
2511 stream
->index_file
= lttng_index_file_create(stream
->path_name
,
2512 stream
->channel_name
,
2513 -1, -1, stream
->tracefile_size
,
2514 tracefile_array_get_file_index_head(stream
->tfa
),
2515 lttng_to_index_major(major
, minor
),
2516 lttng_to_index_minor(major
, minor
));
2517 if (!stream
->index_file
) {
2519 /* Put self-ref for this index due to error. */
2520 relay_index_put(index
);
2526 if (relay_index_set_file(index
, stream
->index_file
, data_offset
)) {
2528 /* Put self-ref for this index due to error. */
2529 relay_index_put(index
);
2534 ret
= relay_index_try_flush(index
);
2536 tracefile_array_commit_seq(stream
->tfa
);
2537 stream
->index_received_seqcount
++;
2538 } else if (ret
> 0) {
2542 /* Put self-ref for this index due to error. */
2543 relay_index_put(index
);
2552 * relay_process_data: Process the data received on the data socket
2554 static int relay_process_data(struct relay_connection
*conn
)
2556 int ret
= 0, rotate_index
= 0;
2558 struct relay_stream
*stream
;
2559 struct lttcomm_relayd_data_hdr data_hdr
;
2561 uint64_t net_seq_num
;
2563 struct relay_session
*session
;
2564 bool new_stream
= false, close_requested
= false;
2565 size_t chunk_size
= RECV_DATA_BUFFER_SIZE
;
2566 size_t recv_off
= 0;
2567 char data_buffer
[chunk_size
];
2569 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &data_hdr
,
2570 sizeof(struct lttcomm_relayd_data_hdr
), 0);
2573 /* Orderly shutdown. Not necessary to print an error. */
2574 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2576 ERR("Unable to receive data header on sock %d", conn
->sock
->fd
);
2582 stream_id
= be64toh(data_hdr
.stream_id
);
2583 stream
= stream_get_by_id(stream_id
);
2585 ERR("relay_process_data: Cannot find stream %" PRIu64
, stream_id
);
2589 session
= stream
->trace
->session
;
2590 data_size
= be32toh(data_hdr
.data_size
);
2592 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
2594 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
2595 data_size
, stream_id
, net_seq_num
);
2597 pthread_mutex_lock(&stream
->lock
);
2599 /* Check if a rotation is needed. */
2600 if (stream
->tracefile_size
> 0 &&
2601 (stream
->tracefile_size_current
+ data_size
) >
2602 stream
->tracefile_size
) {
2603 uint64_t old_id
, new_id
;
2605 old_id
= tracefile_array_get_file_index_head(stream
->tfa
);
2606 tracefile_array_file_rotate(stream
->tfa
);
2608 /* new_id is updated by utils_rotate_stream_file. */
2611 ret
= utils_rotate_stream_file(stream
->path_name
,
2612 stream
->channel_name
, stream
->tracefile_size
,
2613 stream
->tracefile_count
, -1,
2614 -1, stream
->stream_fd
->fd
,
2615 &new_id
, &stream
->stream_fd
->fd
);
2617 ERR("Rotating stream output file");
2618 goto end_stream_unlock
;
2621 * Reset current size because we just performed a stream
2624 stream
->tracefile_size_current
= 0;
2629 * Index are handled in protocol version 2.4 and above. Also,
2630 * snapshot and index are NOT supported.
2632 if (session
->minor
>= 4 && !session
->snapshot
) {
2633 ret
= handle_index_data(stream
, net_seq_num
, rotate_index
);
2635 ERR("handle_index_data: fail stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
2636 stream
->stream_handle
, net_seq_num
, ret
);
2637 goto end_stream_unlock
;
2641 for (recv_off
= 0; recv_off
< data_size
; recv_off
+= chunk_size
) {
2642 size_t recv_size
= min(data_size
- recv_off
, chunk_size
);
2644 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, recv_size
, 0);
2647 /* Orderly shutdown. Not necessary to print an error. */
2648 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2650 ERR("Socket %d error %d", conn
->sock
->fd
, ret
);
2653 goto end_stream_unlock
;
2656 /* Write data to stream output fd. */
2657 size_ret
= lttng_write(stream
->stream_fd
->fd
, data_buffer
,
2659 if (size_ret
< recv_size
) {
2660 ERR("Relay error writing data to file");
2662 goto end_stream_unlock
;
2665 DBG2("Relay wrote %zd bytes to tracefile for stream id %" PRIu64
,
2666 size_ret
, stream
->stream_handle
);
2669 ret
= write_padding_to_file(stream
->stream_fd
->fd
,
2670 be32toh(data_hdr
.padding_size
));
2672 ERR("write_padding_to_file: fail stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
2673 stream
->stream_handle
, net_seq_num
, ret
);
2674 goto end_stream_unlock
;
2676 stream
->tracefile_size_current
+=
2677 data_size
+ be32toh(data_hdr
.padding_size
);
2678 if (stream
->prev_seq
== -1ULL) {
2682 stream
->prev_seq
= net_seq_num
;
2685 close_requested
= stream
->close_requested
;
2686 pthread_mutex_unlock(&stream
->lock
);
2687 if (close_requested
) {
2688 try_stream_close(stream
);
2692 pthread_mutex_lock(&session
->lock
);
2693 uatomic_set(&session
->new_streams
, 1);
2694 pthread_mutex_unlock(&session
->lock
);
2701 static void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
2705 (void) lttng_poll_del(events
, pollfd
);
2707 ret
= close(pollfd
);
2709 ERR("Closing pollfd %d", pollfd
);
2713 static void relay_thread_close_connection(struct lttng_poll_event
*events
,
2714 int pollfd
, struct relay_connection
*conn
)
2716 const char *type_str
;
2718 switch (conn
->type
) {
2723 type_str
= "Control";
2725 case RELAY_VIEWER_COMMAND
:
2726 type_str
= "Viewer Command";
2728 case RELAY_VIEWER_NOTIFICATION
:
2729 type_str
= "Viewer Notification";
2732 type_str
= "Unknown";
2734 cleanup_connection_pollfd(events
, pollfd
);
2735 connection_put(conn
);
2736 DBG("%s connection closed with %d", type_str
, pollfd
);
2740 * This thread does the actual work
2742 static void *relay_thread_worker(void *data
)
2744 int ret
, err
= -1, last_seen_data_fd
= -1;
2746 struct lttng_poll_event events
;
2747 struct lttng_ht
*relay_connections_ht
;
2748 struct lttng_ht_iter iter
;
2749 struct lttcomm_relayd_hdr recv_hdr
;
2750 struct relay_connection
*destroy_conn
= NULL
;
2752 DBG("[thread] Relay worker started");
2754 rcu_register_thread();
2756 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
2758 if (testpoint(relayd_thread_worker
)) {
2759 goto error_testpoint
;
2762 health_code_update();
2764 /* table of connections indexed on socket */
2765 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2766 if (!relay_connections_ht
) {
2767 goto relay_connections_ht_error
;
2770 ret
= create_thread_poll_set(&events
, 2);
2772 goto error_poll_create
;
2775 ret
= lttng_poll_add(&events
, relay_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
2782 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
2784 health_code_update();
2786 /* Infinite blocking call, waiting for transmission */
2787 DBG3("Relayd worker thread polling...");
2788 health_poll_entry();
2789 ret
= lttng_poll_wait(&events
, -1);
2793 * Restart interrupted system call.
2795 if (errno
== EINTR
) {
2804 * Process control. The control connection is
2805 * prioritized so we don't starve it with high
2806 * throughput tracing data on the data connection.
2808 for (i
= 0; i
< nb_fd
; i
++) {
2809 /* Fetch once the poll data */
2810 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2811 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2813 health_code_update();
2817 * No activity for this FD (poll
2823 /* Thread quit pipe has been closed. Killing thread. */
2824 ret
= check_thread_quit_pipe(pollfd
, revents
);
2830 /* Inspect the relay conn pipe for new connection */
2831 if (pollfd
== relay_conn_pipe
[0]) {
2832 if (revents
& LPOLLIN
) {
2833 struct relay_connection
*conn
;
2835 ret
= lttng_read(relay_conn_pipe
[0], &conn
, sizeof(conn
));
2839 lttng_poll_add(&events
, conn
->sock
->fd
,
2840 LPOLLIN
| LPOLLRDHUP
);
2841 connection_ht_add(relay_connections_ht
, conn
);
2842 DBG("Connection socket %d added", conn
->sock
->fd
);
2843 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2844 ERR("Relay connection pipe error");
2847 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2851 struct relay_connection
*ctrl_conn
;
2853 ctrl_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
2854 /* If not found, there is a synchronization issue. */
2857 if (ctrl_conn
->type
== RELAY_DATA
) {
2858 if (revents
& LPOLLIN
) {
2860 * Flag the last seen data fd not deleted. It will be
2861 * used as the last seen fd if any fd gets deleted in
2864 last_notdel_data_fd
= pollfd
;
2866 goto put_ctrl_connection
;
2868 assert(ctrl_conn
->type
== RELAY_CONTROL
);
2870 if (revents
& LPOLLIN
) {
2871 ret
= ctrl_conn
->sock
->ops
->recvmsg(ctrl_conn
->sock
,
2872 &recv_hdr
, sizeof(recv_hdr
), 0);
2874 /* Connection closed */
2875 relay_thread_close_connection(&events
, pollfd
,
2878 ret
= relay_process_control(&recv_hdr
, ctrl_conn
);
2880 /* Clear the session on error. */
2881 relay_thread_close_connection(&events
,
2886 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2887 relay_thread_close_connection(&events
,
2889 if (last_seen_data_fd
== pollfd
) {
2890 last_seen_data_fd
= last_notdel_data_fd
;
2893 ERR("Unexpected poll events %u for control sock %d",
2895 connection_put(ctrl_conn
);
2898 put_ctrl_connection
:
2899 connection_put(ctrl_conn
);
2904 * The last loop handled a control request, go back to poll to make
2905 * sure we prioritise the control socket.
2911 if (last_seen_data_fd
>= 0) {
2912 for (i
= 0; i
< nb_fd
; i
++) {
2913 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2915 health_code_update();
2917 if (last_seen_data_fd
== pollfd
) {
2924 /* Process data connection. */
2925 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
2926 /* Fetch the poll data. */
2927 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2928 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2929 struct relay_connection
*data_conn
;
2931 health_code_update();
2934 /* No activity for this FD (poll implementation). */
2938 /* Skip the command pipe. It's handled in the first loop. */
2939 if (pollfd
== relay_conn_pipe
[0]) {
2943 data_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
2945 /* Skip it. Might be removed before. */
2948 if (data_conn
->type
== RELAY_CONTROL
) {
2949 goto put_data_connection
;
2951 assert(data_conn
->type
== RELAY_DATA
);
2953 if (revents
& LPOLLIN
) {
2954 ret
= relay_process_data(data_conn
);
2955 /* Connection closed */
2957 relay_thread_close_connection(&events
, pollfd
,
2960 * Every goto restart call sets the last seen fd where
2961 * here we don't really care since we gracefully
2962 * continue the loop after the connection is deleted.
2965 /* Keep last seen port. */
2966 last_seen_data_fd
= pollfd
;
2967 connection_put(data_conn
);
2970 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2971 relay_thread_close_connection(&events
, pollfd
,
2974 ERR("Unknown poll events %u for data sock %d",
2977 put_data_connection
:
2978 connection_put(data_conn
);
2980 last_seen_data_fd
= -1;
2983 /* Normal exit, no error */
2988 /* Cleanup reamaining connection object. */
2990 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
,
2993 health_code_update();
2995 if (session_abort(destroy_conn
->session
)) {
3000 * No need to grab another ref, because we own
3003 relay_thread_close_connection(&events
, destroy_conn
->sock
->fd
,
3008 lttng_poll_clean(&events
);
3010 lttng_ht_destroy(relay_connections_ht
);
3011 relay_connections_ht_error
:
3012 /* Close relay conn pipes */
3013 utils_close_pipe(relay_conn_pipe
);
3015 DBG("Thread exited with error");
3017 DBG("Worker thread cleanup complete");
3021 ERR("Health error occurred in %s", __func__
);
3023 health_unregister(health_relayd
);
3024 rcu_unregister_thread();
3025 lttng_relay_stop_threads();
3030 * Create the relay command pipe to wake thread_manage_apps.
3031 * Closed in cleanup().
3033 static int create_relay_conn_pipe(void)
3037 ret
= utils_create_pipe_cloexec(relay_conn_pipe
);
3045 int main(int argc
, char **argv
)
3047 int ret
= 0, retval
= 0;
3050 /* Parse arguments */
3052 if (set_options(argc
, argv
)) {
3057 if (set_signal_handler()) {
3062 /* Try to create directory if -o, --output is specified. */
3063 if (opt_output_path
) {
3064 if (*opt_output_path
!= '/') {
3065 ERR("Please specify an absolute path for -o, --output PATH");
3070 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
,
3073 ERR("Unable to create %s", opt_output_path
);
3080 if (opt_daemon
|| opt_background
) {
3083 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
3091 * We are in the child. Make sure all other file
3092 * descriptors are closed, in case we are called with
3093 * more opened file descriptors than the standard ones.
3095 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
3100 /* Initialize thread health monitoring */
3101 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
3102 if (!health_relayd
) {
3103 PERROR("health_app_create error");
3105 goto exit_health_app_create
;
3108 /* Create thread quit pipe */
3109 if (init_thread_quit_pipe()) {
3111 goto exit_init_data
;
3114 /* Setup the thread apps communication pipe. */
3115 if (create_relay_conn_pipe()) {
3117 goto exit_init_data
;
3120 /* Init relay command queue. */
3121 cds_wfcq_init(&relay_conn_queue
.head
, &relay_conn_queue
.tail
);
3123 /* Initialize communication library */
3125 lttcomm_inet_init();
3127 /* tables of sessions indexed by session ID */
3128 sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3131 goto exit_init_data
;
3134 /* tables of streams indexed by stream ID */
3135 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3136 if (!relay_streams_ht
) {
3138 goto exit_init_data
;
3141 /* tables of streams indexed by stream ID */
3142 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3143 if (!viewer_streams_ht
) {
3145 goto exit_init_data
;
3148 ret
= utils_create_pipe(health_quit_pipe
);
3151 goto exit_health_quit_pipe
;
3154 /* Create thread to manage the client socket */
3155 ret
= pthread_create(&health_thread
, default_pthread_attr(),
3156 thread_manage_health
, (void *) NULL
);
3159 PERROR("pthread_create health");
3161 goto exit_health_thread
;
3164 /* Setup the dispatcher thread */
3165 ret
= pthread_create(&dispatcher_thread
, default_pthread_attr(),
3166 relay_thread_dispatcher
, (void *) NULL
);
3169 PERROR("pthread_create dispatcher");
3171 goto exit_dispatcher_thread
;
3174 /* Setup the worker thread */
3175 ret
= pthread_create(&worker_thread
, default_pthread_attr(),
3176 relay_thread_worker
, NULL
);
3179 PERROR("pthread_create worker");
3181 goto exit_worker_thread
;
3184 /* Setup the listener thread */
3185 ret
= pthread_create(&listener_thread
, default_pthread_attr(),
3186 relay_thread_listener
, (void *) NULL
);
3189 PERROR("pthread_create listener");
3191 goto exit_listener_thread
;
3194 ret
= relayd_live_create(live_uri
);
3196 ERR("Starting live viewer threads");
3202 * This is where we start awaiting program completion (e.g. through
3203 * signal that asks threads to teardown).
3206 ret
= relayd_live_join();
3212 ret
= pthread_join(listener_thread
, &status
);
3215 PERROR("pthread_join listener_thread");
3219 exit_listener_thread
:
3220 ret
= pthread_join(worker_thread
, &status
);
3223 PERROR("pthread_join worker_thread");
3228 ret
= pthread_join(dispatcher_thread
, &status
);
3231 PERROR("pthread_join dispatcher_thread");
3234 exit_dispatcher_thread
:
3236 ret
= pthread_join(health_thread
, &status
);
3239 PERROR("pthread_join health_thread");
3244 utils_close_pipe(health_quit_pipe
);
3245 exit_health_quit_pipe
:
3248 health_app_destroy(health_relayd
);
3249 exit_health_app_create
:
3252 * Wait for all pending call_rcu work to complete before tearing
3253 * down data structures. call_rcu worker may be trying to
3254 * perform lookups in those structures.
3259 /* Ensure all prior call_rcu are done. */