Annotation of src/usr.bin/tmux/server.c, Revision 1.104
1.104 ! nicm 1: /* $OpenBSD: server.c,v 1.103 2012/03/09 09:57:40 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
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.
9: *
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.
17: */
18:
19: #include <sys/types.h>
20: #include <sys/ioctl.h>
21: #include <sys/socket.h>
22: #include <sys/stat.h>
23: #include <sys/un.h>
24: #include <sys/wait.h>
25:
26: #include <errno.h>
1.66 nicm 27: #include <event.h>
1.1 nicm 28: #include <fcntl.h>
1.5 nicm 29: #include <paths.h>
1.1 nicm 30: #include <signal.h>
31: #include <stdio.h>
32: #include <stdlib.h>
33: #include <string.h>
34: #include <syslog.h>
35: #include <termios.h>
36: #include <time.h>
37: #include <unistd.h>
38:
39: #include "tmux.h"
40:
41: /*
42: * Main server functions.
43: */
44:
45: /* Client list. */
46: struct clients clients;
1.31 nicm 47: struct clients dead_clients;
1.1 nicm 48:
1.66 nicm 49: int server_fd;
50: int server_shutdown;
51: struct event server_ev_accept;
52: struct event server_ev_second;
1.45 nicm 53:
1.98 nicm 54: struct paste_stack global_buffers;
55:
1.1 nicm 56: int server_create_socket(void);
1.66 nicm 57: void server_loop(void);
1.42 nicm 58: int server_should_shutdown(void);
1.66 nicm 59: void server_send_shutdown(void);
60: void server_clean_dead(void);
61: void server_accept_callback(int, short, void *);
62: void server_signal_callback(int, short, void *);
1.1 nicm 63: void server_child_signal(void);
1.66 nicm 64: void server_child_exited(pid_t, int);
65: void server_child_stopped(pid_t, int);
66: void server_second_callback(int, short, void *);
1.46 nicm 67: void server_lock_server(void);
68: void server_lock_sessions(void);
1.45 nicm 69:
1.60 nicm 70: /* Create server socket. */
71: int
72: server_create_socket(void)
1.1 nicm 73: {
1.60 nicm 74: struct sockaddr_un sa;
75: size_t size;
76: mode_t mask;
1.100 nicm 77: int fd;
1.60 nicm 78:
79: memset(&sa, 0, sizeof sa);
80: sa.sun_family = AF_UNIX;
81: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
82: if (size >= sizeof sa.sun_path) {
83: errno = ENAMETOOLONG;
84: fatal("socket failed");
85: }
86: unlink(sa.sun_path);
87:
88: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
89: fatal("socket failed");
90:
1.89 nicm 91: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.60 nicm 92: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
93: fatal("bind failed");
94: umask(mask);
95:
96: if (listen(fd, 16) == -1)
97: fatal("listen failed");
1.100 nicm 98: setblocking(fd, 0);
1.1 nicm 99:
1.75 nicm 100: server_update_socket();
101:
1.60 nicm 102: return (fd);
103: }
104:
1.1 nicm 105: /* Fork new server. */
106: int
1.103 nicm 107: server_start(int lockfd, char *lockfile)
1.1 nicm 108: {
1.82 nicm 109: struct window_pane *wp;
1.84 nicm 110: int pair[2];
1.96 nicm 111: char *cause;
1.82 nicm 112: struct timeval tv;
113: u_int i;
1.1 nicm 114:
115: /* The first client is special and gets a socketpair; create it. */
116: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
117: fatal("socketpair failed");
118:
119: switch (fork()) {
120: case -1:
121: fatal("fork failed");
122: case 0:
123: break;
124: default:
125: close(pair[1]);
126: return (pair[0]);
127: }
128: close(pair[0]);
129:
130: /*
131: * Must daemonise before loading configuration as the PID changes so
132: * $TMUX would be wrong for sessions created in the config file.
133: */
1.16 nicm 134: if (daemon(1, 0) != 0)
1.1 nicm 135: fatal("daemon failed");
136:
1.88 nicm 137: /* event_init() was called in our parent, need to reinit. */
138: if (event_reinit(ev_base) != 0)
139: fatal("event_reinit failed");
1.92 nicm 140: clear_signals(0);
1.88 nicm 141:
1.16 nicm 142: logfile("server");
143: log_debug("server started, pid %ld", (long) getpid());
144:
1.1 nicm 145: ARRAY_INIT(&windows);
1.102 nicm 146: RB_INIT(&all_window_panes);
1.1 nicm 147: ARRAY_INIT(&clients);
1.31 nicm 148: ARRAY_INIT(&dead_clients);
1.97 nicm 149: RB_INIT(&sessions);
150: RB_INIT(&dead_sessions);
1.47 nicm 151: TAILQ_INIT(&session_groups);
1.98 nicm 152: ARRAY_INIT(&global_buffers);
1.15 nicm 153: mode_key_init_trees();
1.1 nicm 154: key_bindings_init();
155: utf8_build();
156:
157: start_time = time(NULL);
1.16 nicm 158: log_debug("socket path %s", socket_path);
1.96 nicm 159: setproctitle("server (%s)", socket_path);
1.16 nicm 160:
1.66 nicm 161: server_fd = server_create_socket();
1.60 nicm 162: server_client_create(pair[1]);
1.103 nicm 163:
164: unlink(lockfile);
165: xfree(lockfile);
166: close(lockfd);
1.16 nicm 167:
1.82 nicm 168: if (access(SYSTEM_CFG, R_OK) == 0)
1.83 nicm 169: load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
1.82 nicm 170: else if (errno != ENOENT) {
1.83 nicm 171: cfg_add_cause(
172: &cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
1.64 nicm 173: }
1.82 nicm 174: if (cfg_file != NULL)
1.83 nicm 175: load_cfg(cfg_file, NULL, &cfg_causes);
1.82 nicm 176:
177: /*
178: * If there is a session already, put the current window and pane into
179: * more mode.
180: */
1.97 nicm 181: if (!RB_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
182: wp = RB_MIN(sessions, &sessions)->curw->window->active;
1.85 nicm 183: window_pane_set_mode(wp, &window_copy_mode);
184: window_copy_init_for_output(wp);
1.83 nicm 185: for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
186: cause = ARRAY_ITEM(&cfg_causes, i);
1.85 nicm 187: window_copy_add(wp, "%s", cause);
1.83 nicm 188: xfree(cause);
1.82 nicm 189: }
1.83 nicm 190: ARRAY_FREE(&cfg_causes);
1.82 nicm 191: }
192: cfg_finished = 1;
1.66 nicm 193:
1.104 ! nicm 194: server_add_accept(0);
1.66 nicm 195:
196: memset(&tv, 0, sizeof tv);
197: tv.tv_sec = 1;
198: evtimer_set(&server_ev_second, server_second_callback, NULL);
199: evtimer_add(&server_ev_second, &tv);
200:
1.88 nicm 201: set_signals(server_signal_callback);
1.66 nicm 202: server_loop();
203: exit(0);
1.1 nicm 204: }
205:
206: /* Main server loop. */
1.66 nicm 207: void
208: server_loop(void)
1.1 nicm 209: {
1.66 nicm 210: while (!server_should_shutdown()) {
211: event_loop(EVLOOP_ONCE);
1.1 nicm 212:
1.60 nicm 213: server_window_loop();
214: server_client_loop();
1.1 nicm 215:
1.8 nicm 216: key_bindings_clean();
1.66 nicm 217: server_clean_dead();
1.80 nicm 218: }
1.66 nicm 219: }
1.31 nicm 220:
1.94 nicm 221: /* Check if the server should be shutting down (no more clients or sessions). */
1.66 nicm 222: int
223: server_should_shutdown(void)
224: {
225: u_int i;
1.1 nicm 226:
1.94 nicm 227: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 228: if (!RB_EMPTY(&sessions))
229: return (0);
1.1 nicm 230: }
231: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
232: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 233: return (0);
1.1 nicm 234: }
1.66 nicm 235: return (1);
1.1 nicm 236: }
237:
1.66 nicm 238: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 239: void
1.66 nicm 240: server_send_shutdown(void)
1.1 nicm 241: {
1.66 nicm 242: struct client *c;
1.97 nicm 243: struct session *s, *next_s;
1.66 nicm 244: u_int i;
1.1 nicm 245:
1.42 nicm 246: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
247: c = ARRAY_ITEM(&clients, i);
248: if (c != NULL) {
249: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 250: server_client_lost(c);
1.42 nicm 251: else
252: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 253: c->session = NULL;
1.42 nicm 254: }
255: }
256:
1.97 nicm 257: s = RB_MIN(sessions, &sessions);
258: while (s != NULL) {
259: next_s = RB_NEXT(sessions, &sessions, s);
260: session_destroy(s);
261: s = next_s;
1.1 nicm 262: }
1.42 nicm 263: }
264:
1.66 nicm 265: /* Free dead, unreferenced clients and sessions. */
266: void
267: server_clean_dead(void)
268: {
1.97 nicm 269: struct session *s, *next_s;
1.66 nicm 270: struct client *c;
271: u_int i;
272:
1.97 nicm 273: s = RB_MIN(sessions, &dead_sessions);
274: while (s != NULL) {
275: next_s = RB_NEXT(sessions, &dead_sessions, s);
276: if (s->references == 0) {
277: RB_REMOVE(sessions, &dead_sessions, s);
278: xfree(s->name);
279: xfree(s);
280: }
281: s = next_s;
1.66 nicm 282: }
283:
284: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
285: c = ARRAY_ITEM(&dead_clients, i);
286: if (c == NULL || c->references != 0)
287: continue;
288: ARRAY_SET(&dead_clients, i, NULL);
289: xfree(c);
290: }
291: }
292:
293: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 294: void
1.66 nicm 295: server_update_socket(void)
1.42 nicm 296: {
1.66 nicm 297: struct session *s;
298: static int last = -1;
1.93 nicm 299: int n, mode;
300: struct stat sb;
1.1 nicm 301:
1.66 nicm 302: n = 0;
1.97 nicm 303: RB_FOREACH(s, sessions, &sessions) {
304: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 305: n++;
306: break;
307: }
308: }
309:
310: if (n != last) {
311: last = n;
1.93 nicm 312:
313: if (stat(socket_path, &sb) != 0)
314: return;
315: mode = sb.st_mode;
316: if (n != 0) {
317: if (mode & S_IRUSR)
318: mode |= S_IXUSR;
319: if (mode & S_IRGRP)
320: mode |= S_IXGRP;
321: if (mode & S_IROTH)
322: mode |= S_IXOTH;
323: } else
324: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
325: chmod(socket_path, mode);
1.66 nicm 326: }
327: }
328:
329: /* Callback for server socket. */
1.78 nicm 330: /* ARGSUSED */
1.66 nicm 331: void
332: server_accept_callback(int fd, short events, unused void *data)
333: {
334: struct sockaddr_storage sa;
335: socklen_t slen = sizeof sa;
336: int newfd;
337:
1.104 ! nicm 338: server_add_accept(0);
1.66 nicm 339: if (!(events & EV_READ))
340: return;
341:
342: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
343: if (newfd == -1) {
344: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
345: return;
1.104 ! nicm 346: if (errno == ENFILE || errno == EMFILE) {
! 347: /* Delete and don't try again for 1 second. */
! 348: server_add_accept(1);
! 349: return;
! 350: }
1.66 nicm 351: fatal("accept failed");
352: }
353: if (server_shutdown) {
354: close(newfd);
355: return;
1.42 nicm 356: }
1.66 nicm 357: server_client_create(newfd);
358: }
359:
1.104 ! nicm 360: /*
! 361: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
! 362: * event - used to backoff when running out of file descriptors.
! 363: */
! 364: void
! 365: server_add_accept(int timeout)
! 366: {
! 367: struct timeval tv = { timeout, 0 };
! 368:
! 369: if (event_initialized(&server_ev_accept))
! 370: event_del(&server_ev_accept);
! 371:
! 372: if (timeout == 0) {
! 373: event_set(&server_ev_accept,
! 374: server_fd, EV_READ, server_accept_callback, NULL);
! 375: event_add(&server_ev_accept, NULL);
! 376: } else {
! 377: event_set(&server_ev_accept,
! 378: server_fd, EV_TIMEOUT, server_accept_callback, NULL);
! 379: event_add(&server_ev_accept, &tv);
! 380: }
! 381: }
! 382:
1.66 nicm 383: /* Signal handler. */
1.78 nicm 384: /* ARGSUSED */
1.66 nicm 385: void
386: server_signal_callback(int sig, unused short events, unused void *data)
387: {
388: switch (sig) {
389: case SIGTERM:
390: server_shutdown = 1;
391: server_send_shutdown();
392: break;
393: case SIGCHLD:
394: server_child_signal();
395: break;
396: case SIGUSR1:
397: event_del(&server_ev_accept);
398: close(server_fd);
399: server_fd = server_create_socket();
1.104 ! nicm 400: server_add_accept(0);
1.66 nicm 401: break;
1.1 nicm 402: }
403: }
404:
405: /* Handle SIGCHLD. */
406: void
407: server_child_signal(void)
408: {
1.66 nicm 409: int status;
410: pid_t pid;
1.1 nicm 411:
412: for (;;) {
413: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
414: case -1:
415: if (errno == ECHILD)
416: return;
1.39 nicm 417: fatal("waitpid failed");
1.1 nicm 418: case 0:
419: return;
420: }
1.66 nicm 421: if (WIFSTOPPED(status))
422: server_child_stopped(pid, status);
1.79 nicm 423: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 424: server_child_exited(pid, status);
425: }
426: }
427:
428: /* Handle exited children. */
429: void
430: server_child_exited(pid_t pid, int status)
431: {
432: struct window *w;
433: struct window_pane *wp;
434: struct job *job;
435: u_int i;
436:
437: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
438: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
439: continue;
440: TAILQ_FOREACH(wp, &w->panes, entry) {
441: if (wp->pid == pid) {
1.77 nicm 442: server_destroy_pane(wp);
443: break;
1.53 nicm 444: }
445: }
1.80 nicm 446: }
1.1 nicm 447:
1.101 nicm 448: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 449: if (pid == job->pid) {
1.67 nicm 450: job_died(job, status); /* might free job */
451: break;
1.1 nicm 452: }
1.53 nicm 453: }
454: }
455:
1.66 nicm 456: /* Handle stopped children. */
1.31 nicm 457: void
1.66 nicm 458: server_child_stopped(pid_t pid, int status)
1.31 nicm 459: {
1.66 nicm 460: struct window *w;
461: struct window_pane *wp;
462: u_int i;
1.31 nicm 463:
1.66 nicm 464: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
465: return;
1.31 nicm 466:
1.66 nicm 467: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
468: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 469: continue;
1.66 nicm 470: TAILQ_FOREACH(wp, &w->panes, entry) {
471: if (wp->pid == pid) {
472: if (killpg(pid, SIGCONT) != 0)
473: kill(pid, SIGCONT);
474: }
475: }
1.31 nicm 476: }
1.1 nicm 477: }
478:
1.66 nicm 479: /* Handle once-per-second timer events. */
1.78 nicm 480: /* ARGSUSED */
1.1 nicm 481: void
1.66 nicm 482: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 483: {
1.60 nicm 484: struct window *w;
485: struct window_pane *wp;
1.66 nicm 486: struct timeval tv;
1.35 nicm 487: u_int i;
1.1 nicm 488:
1.60 nicm 489: if (options_get_number(&global_s_options, "lock-server"))
490: server_lock_server();
491: else
492: server_lock_sessions();
1.1 nicm 493:
1.60 nicm 494: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
495: w = ARRAY_ITEM(&windows, i);
496: if (w == NULL)
1.1 nicm 497: continue;
498:
1.60 nicm 499: TAILQ_FOREACH(wp, &w->panes, entry) {
500: if (wp->mode != NULL && wp->mode->timer != NULL)
501: wp->mode->timer(wp);
1.1 nicm 502: }
503: }
1.72 nicm 504:
505: server_client_status_timer();
1.66 nicm 506:
507: evtimer_del(&server_ev_second);
508: memset(&tv, 0, sizeof tv);
509: tv.tv_sec = 1;
510: evtimer_add(&server_ev_second, &tv);
1.1 nicm 511: }
512:
1.46 nicm 513: /* Lock the server if ALL sessions have hit the time limit. */
514: void
515: server_lock_server(void)
516: {
517: struct session *s;
518: int timeout;
519: time_t t;
520:
521: t = time(NULL);
1.97 nicm 522: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 523: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 524: continue;
1.46 nicm 525: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 526: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 527: return; /* not timed out */
528: }
529:
530: server_lock();
531: recalculate_sizes();
532: }
533:
534: /* Lock any sessions which have timed out. */
535: void
536: server_lock_sessions(void)
537: {
1.80 nicm 538: struct session *s;
1.46 nicm 539: int timeout;
1.62 deraadt 540: time_t t;
1.46 nicm 541:
1.62 deraadt 542: t = time(NULL);
1.97 nicm 543: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 544: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 545: continue;
1.46 nicm 546: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 547: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 548: server_lock_session(s);
549: recalculate_sizes();
1.1 nicm 550: }
551: }
552: }
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