4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
20 #include <sys/ioctl.h>
21 #include <sys/socket.h>
42 * Main server functions.
46 struct clients clients
;
47 struct clients dead_clients
;
51 struct event server_ev_accept
;
52 struct event server_ev_second
;
54 int server_create_socket(void);
55 void server_loop(void);
56 int server_should_shutdown(void);
57 void server_send_shutdown(void);
58 void server_clean_dead(void);
59 void server_accept_callback(int, short, void *);
60 void server_signal_callback(int, short, void *);
61 void server_child_signal(void);
62 void server_child_exited(pid_t
, int);
63 void server_child_stopped(pid_t
, int);
64 void server_second_callback(int, short, void *);
65 void server_lock_server(void);
66 void server_lock_sessions(void);
68 /* Create server socket. */
70 server_create_socket(void)
72 struct sockaddr_un sa
;
77 memset(&sa
, 0, sizeof sa
);
78 sa
.sun_family
= AF_UNIX
;
79 size
= strlcpy(sa
.sun_path
, socket_path
, sizeof sa
.sun_path
);
80 if (size
>= sizeof sa
.sun_path
) {
82 fatal("socket failed");
86 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1)
87 fatal("socket failed");
89 mask
= umask(S_IXUSR
|S_IXGRP
|S_IRWXO
);
90 if (bind(fd
, (struct sockaddr
*) &sa
, SUN_LEN(&sa
)) == -1)
94 if (listen(fd
, 16) == -1)
95 fatal("listen failed");
97 if ((mode
= fcntl(fd
, F_GETFL
)) == -1)
98 fatal("fcntl failed");
99 if (fcntl(fd
, F_SETFL
, mode
|O_NONBLOCK
) == -1)
100 fatal("fcntl failed");
102 server_update_socket();
107 /* Fork new server. */
111 struct window_pane
*wp
;
117 /* The first client is special and gets a socketpair; create it. */
118 if (socketpair(AF_UNIX
, SOCK_STREAM
, PF_UNSPEC
, pair
) != 0)
119 fatal("socketpair failed");
123 fatal("fork failed");
133 * Must daemonise before loading configuration as the PID changes so
134 * $TMUX would be wrong for sessions created in the config file.
136 if (daemon(1, 0) != 0)
137 fatal("daemon failed");
139 /* event_init() was called in our parent, need to reinit. */
140 if (event_reinit(ev_base
) != 0)
141 fatal("event_reinit failed");
145 log_debug("server started, pid %ld", (long) getpid());
147 ARRAY_INIT(&windows
);
148 ARRAY_INIT(&clients
);
149 ARRAY_INIT(&dead_clients
);
150 ARRAY_INIT(&sessions
);
151 ARRAY_INIT(&dead_sessions
);
152 TAILQ_INIT(&session_groups
);
153 mode_key_init_trees();
157 start_time
= time(NULL
);
158 log_debug("socket path %s", socket_path
);
159 setproctitle("server (%s)", socket_path
);
161 server_fd
= server_create_socket();
162 server_client_create(pair
[1]);
164 if (access(SYSTEM_CFG
, R_OK
) == 0)
165 load_cfg(SYSTEM_CFG
, NULL
, &cfg_causes
);
166 else if (errno
!= ENOENT
) {
168 &cfg_causes
, "%s: %s", strerror(errno
), SYSTEM_CFG
);
170 if (cfg_file
!= NULL
)
171 load_cfg(cfg_file
, NULL
, &cfg_causes
);
174 * If there is a session already, put the current window and pane into
177 if (!ARRAY_EMPTY(&sessions
) && !ARRAY_EMPTY(&cfg_causes
)) {
178 wp
= ARRAY_FIRST(&sessions
)->curw
->window
->active
;
179 window_pane_set_mode(wp
, &window_copy_mode
);
180 window_copy_init_for_output(wp
);
181 for (i
= 0; i
< ARRAY_LENGTH(&cfg_causes
); i
++) {
182 cause
= ARRAY_ITEM(&cfg_causes
, i
);
183 window_copy_add(wp
, "%s", cause
);
186 ARRAY_FREE(&cfg_causes
);
190 event_set(&server_ev_accept
,
191 server_fd
, EV_READ
|EV_PERSIST
, server_accept_callback
, NULL
);
192 event_add(&server_ev_accept
, NULL
);
194 memset(&tv
, 0, sizeof tv
);
196 evtimer_set(&server_ev_second
, server_second_callback
, NULL
);
197 evtimer_add(&server_ev_second
, &tv
);
199 set_signals(server_signal_callback
);
204 /* Main server loop. */
208 while (!server_should_shutdown()) {
209 event_loop(EVLOOP_ONCE
);
211 server_window_loop();
212 server_client_loop();
214 key_bindings_clean();
219 /* Check if the server should be shutting down (no more clients or sessions). */
221 server_should_shutdown(void)
225 if (!options_get_number(&global_options
, "exit-unattached")) {
226 for (i
= 0; i
< ARRAY_LENGTH(&sessions
); i
++) {
227 if (ARRAY_ITEM(&sessions
, i
) != NULL
)
231 for (i
= 0; i
< ARRAY_LENGTH(&clients
); i
++) {
232 if (ARRAY_ITEM(&clients
, i
) != NULL
)
238 /* Shutdown the server by killing all clients and windows. */
240 server_send_shutdown(void)
246 for (i
= 0; i
< ARRAY_LENGTH(&clients
); i
++) {
247 c
= ARRAY_ITEM(&clients
, i
);
249 if (c
->flags
& (CLIENT_BAD
|CLIENT_SUSPENDED
))
250 server_client_lost(c
);
252 server_write_client(c
, MSG_SHUTDOWN
, NULL
, 0);
257 for (i
= 0; i
< ARRAY_LENGTH(&sessions
); i
++) {
258 if ((s
= ARRAY_ITEM(&sessions
, i
)) != NULL
)
263 /* Free dead, unreferenced clients and sessions. */
265 server_clean_dead(void)
271 for (i
= 0; i
< ARRAY_LENGTH(&dead_sessions
); i
++) {
272 s
= ARRAY_ITEM(&dead_sessions
, i
);
273 if (s
== NULL
|| s
->references
!= 0)
275 ARRAY_SET(&dead_sessions
, i
, NULL
);
279 for (i
= 0; i
< ARRAY_LENGTH(&dead_clients
); i
++) {
280 c
= ARRAY_ITEM(&dead_clients
, i
);
281 if (c
== NULL
|| c
->references
!= 0)
283 ARRAY_SET(&dead_clients
, i
, NULL
);
288 /* Update socket execute permissions based on whether sessions are attached. */
290 server_update_socket(void)
294 static int last
= -1;
299 for (i
= 0; i
< ARRAY_LENGTH(&sessions
); i
++) {
300 s
= ARRAY_ITEM(&sessions
, i
);
301 if (s
!= NULL
&& !(s
->flags
& SESSION_UNATTACHED
)) {
310 if (stat(socket_path
, &sb
) != 0)
321 mode
&= ~(S_IXUSR
|S_IXGRP
|S_IXOTH
);
322 chmod(socket_path
, mode
);
326 /* Callback for server socket. */
329 server_accept_callback(int fd
, short events
, unused
void *data
)
331 struct sockaddr_storage sa
;
332 socklen_t slen
= sizeof sa
;
335 if (!(events
& EV_READ
))
338 newfd
= accept(fd
, (struct sockaddr
*) &sa
, &slen
);
340 if (errno
== EAGAIN
|| errno
== EINTR
|| errno
== ECONNABORTED
)
342 fatal("accept failed");
344 if (server_shutdown
) {
348 server_client_create(newfd
);
351 /* Signal handler. */
354 server_signal_callback(int sig
, unused
short events
, unused
void *data
)
359 server_send_shutdown();
362 server_child_signal();
365 event_del(&server_ev_accept
);
367 server_fd
= server_create_socket();
368 event_set(&server_ev_accept
, server_fd
,
369 EV_READ
|EV_PERSIST
, server_accept_callback
, NULL
);
370 event_add(&server_ev_accept
, NULL
);
375 /* Handle SIGCHLD. */
377 server_child_signal(void)
383 switch (pid
= waitpid(WAIT_ANY
, &status
, WNOHANG
|WUNTRACED
)) {
387 fatal("waitpid failed");
391 if (WIFSTOPPED(status
))
392 server_child_stopped(pid
, status
);
393 else if (WIFEXITED(status
) || WIFSIGNALED(status
))
394 server_child_exited(pid
, status
);
398 /* Handle exited children. */
400 server_child_exited(pid_t pid
, int status
)
403 struct window_pane
*wp
;
407 for (i
= 0; i
< ARRAY_LENGTH(&windows
); i
++) {
408 if ((w
= ARRAY_ITEM(&windows
, i
)) == NULL
)
410 TAILQ_FOREACH(wp
, &w
->panes
, entry
) {
411 if (wp
->pid
== pid
) {
412 server_destroy_pane(wp
);
418 SLIST_FOREACH(job
, &all_jobs
, lentry
) {
419 if (pid
== job
->pid
) {
420 job_died(job
, status
); /* might free job */
426 /* Handle stopped children. */
428 server_child_stopped(pid_t pid
, int status
)
431 struct window_pane
*wp
;
434 if (WSTOPSIG(status
) == SIGTTIN
|| WSTOPSIG(status
) == SIGTTOU
)
437 for (i
= 0; i
< ARRAY_LENGTH(&windows
); i
++) {
438 if ((w
= ARRAY_ITEM(&windows
, i
)) == NULL
)
440 TAILQ_FOREACH(wp
, &w
->panes
, entry
) {
441 if (wp
->pid
== pid
) {
442 if (killpg(pid
, SIGCONT
) != 0)
449 /* Handle once-per-second timer events. */
452 server_second_callback(unused
int fd
, unused
short events
, unused
void *arg
)
455 struct window_pane
*wp
;
459 if (options_get_number(&global_s_options
, "lock-server"))
460 server_lock_server();
462 server_lock_sessions();
464 for (i
= 0; i
< ARRAY_LENGTH(&windows
); i
++) {
465 w
= ARRAY_ITEM(&windows
, i
);
469 TAILQ_FOREACH(wp
, &w
->panes
, entry
) {
470 if (wp
->mode
!= NULL
&& wp
->mode
->timer
!= NULL
)
475 server_client_status_timer();
477 evtimer_del(&server_ev_second
);
478 memset(&tv
, 0, sizeof tv
);
480 evtimer_add(&server_ev_second
, &tv
);
483 /* Lock the server if ALL sessions have hit the time limit. */
485 server_lock_server(void)
493 for (i
= 0; i
< ARRAY_LENGTH(&sessions
); i
++) {
494 if ((s
= ARRAY_ITEM(&sessions
, i
)) == NULL
)
497 if (s
->flags
& SESSION_UNATTACHED
) {
498 if (gettimeofday(&s
->activity_time
, NULL
) != 0)
499 fatal("gettimeofday failed");
503 timeout
= options_get_number(&s
->options
, "lock-after-time");
504 if (timeout
<= 0 || t
<= s
->activity_time
.tv_sec
+ timeout
)
505 return; /* not timed out */
512 /* Lock any sessions which have timed out. */
514 server_lock_sessions(void)
522 for (i
= 0; i
< ARRAY_LENGTH(&sessions
); i
++) {
523 if ((s
= ARRAY_ITEM(&sessions
, i
)) == NULL
)
526 if (s
->flags
& SESSION_UNATTACHED
) {
527 if (gettimeofday(&s
->activity_time
, NULL
) != 0)
528 fatal("gettimeofday failed");
532 timeout
= options_get_number(&s
->options
, "lock-after-time");
533 if (timeout
> 0 && t
> s
->activity_time
.tv_sec
+ timeout
) {
534 server_lock_session(s
);