Annotation of src/usr.bin/tmux/server.c, Revision 1.90
1.90 ! nicm 1: /* $OpenBSD: server.c,v 1.89 2010/06/21 00:18:57 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:
1.1 nicm 54: int server_create_socket(void);
1.66 nicm 55: void server_loop(void);
1.42 nicm 56: int server_should_shutdown(void);
1.66 nicm 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 *);
1.1 nicm 61: void server_child_signal(void);
1.66 nicm 62: void server_child_exited(pid_t, int);
63: void server_child_stopped(pid_t, int);
64: void server_second_callback(int, short, void *);
1.46 nicm 65: void server_lock_server(void);
66: void server_lock_sessions(void);
1.45 nicm 67:
1.60 nicm 68: /* Create server socket. */
69: int
70: server_create_socket(void)
1.1 nicm 71: {
1.60 nicm 72: struct sockaddr_un sa;
73: size_t size;
74: mode_t mask;
75: int fd, mode;
76:
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) {
81: errno = ENAMETOOLONG;
82: fatal("socket failed");
83: }
84: unlink(sa.sun_path);
85:
86: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
87: fatal("socket failed");
88:
1.89 nicm 89: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.60 nicm 90: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
91: fatal("bind failed");
92: umask(mask);
93:
94: if (listen(fd, 16) == -1)
95: fatal("listen failed");
1.1 nicm 96:
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");
101: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
102: fatal("fcntl failed");
103:
1.75 nicm 104: server_update_socket();
105:
1.60 nicm 106: return (fd);
107: }
108:
1.1 nicm 109: /* Fork new server. */
110: int
111: server_start(char *path)
112: {
1.82 nicm 113: struct window_pane *wp;
1.84 nicm 114: int pair[2];
1.83 nicm 115: char rpathbuf[MAXPATHLEN], *cause;
1.82 nicm 116: struct timeval tv;
117: u_int i;
1.1 nicm 118:
119: /* The first client is special and gets a socketpair; create it. */
120: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
121: fatal("socketpair failed");
122:
123: switch (fork()) {
124: case -1:
125: fatal("fork failed");
126: case 0:
127: break;
128: default:
129: close(pair[1]);
130: return (pair[0]);
131: }
132: close(pair[0]);
133:
134: /*
135: * Must daemonise before loading configuration as the PID changes so
136: * $TMUX would be wrong for sessions created in the config file.
137: */
1.16 nicm 138: if (daemon(1, 0) != 0)
1.1 nicm 139: fatal("daemon failed");
140:
1.88 nicm 141: /* event_init() was called in our parent, need to reinit. */
1.90 ! nicm 142: if (setenv("EVENT_NOKQUEUE", "1", 1) != 0)
! 143: fatal("setenv");
1.88 nicm 144: if (event_reinit(ev_base) != 0)
145: fatal("event_reinit failed");
1.90 ! nicm 146: unsetenv("EVENT_NOKQUEUE");
1.88 nicm 147: clear_signals();
148:
1.16 nicm 149: logfile("server");
150: log_debug("server started, pid %ld", (long) getpid());
151:
1.1 nicm 152: ARRAY_INIT(&windows);
153: ARRAY_INIT(&clients);
1.31 nicm 154: ARRAY_INIT(&dead_clients);
1.1 nicm 155: ARRAY_INIT(&sessions);
1.31 nicm 156: ARRAY_INIT(&dead_sessions);
1.47 nicm 157: TAILQ_INIT(&session_groups);
1.15 nicm 158: mode_key_init_trees();
1.1 nicm 159: key_bindings_init();
160: utf8_build();
161:
162: start_time = time(NULL);
163: socket_path = path;
164:
1.16 nicm 165: if (realpath(socket_path, rpathbuf) == NULL)
166: strlcpy(rpathbuf, socket_path, sizeof rpathbuf);
167: log_debug("socket path %s", socket_path);
168: setproctitle("server (%s)", rpathbuf);
169:
1.66 nicm 170: server_fd = server_create_socket();
1.60 nicm 171: server_client_create(pair[1]);
1.16 nicm 172:
1.82 nicm 173: if (access(SYSTEM_CFG, R_OK) == 0)
1.83 nicm 174: load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
1.82 nicm 175: else if (errno != ENOENT) {
1.83 nicm 176: cfg_add_cause(
177: &cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
1.64 nicm 178: }
1.82 nicm 179: if (cfg_file != NULL)
1.83 nicm 180: load_cfg(cfg_file, NULL, &cfg_causes);
1.82 nicm 181:
182: /*
183: * If there is a session already, put the current window and pane into
184: * more mode.
185: */
1.83 nicm 186: if (!ARRAY_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
1.82 nicm 187: wp = ARRAY_FIRST(&sessions)->curw->window->active;
1.85 nicm 188: window_pane_set_mode(wp, &window_copy_mode);
189: window_copy_init_for_output(wp);
1.83 nicm 190: for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
191: cause = ARRAY_ITEM(&cfg_causes, i);
1.85 nicm 192: window_copy_add(wp, "%s", cause);
1.83 nicm 193: xfree(cause);
1.82 nicm 194: }
1.83 nicm 195: ARRAY_FREE(&cfg_causes);
1.82 nicm 196: }
197: cfg_finished = 1;
1.66 nicm 198:
199: event_set(&server_ev_accept,
200: server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
201: event_add(&server_ev_accept, NULL);
202:
203: memset(&tv, 0, sizeof tv);
204: tv.tv_sec = 1;
205: evtimer_set(&server_ev_second, server_second_callback, NULL);
206: evtimer_add(&server_ev_second, &tv);
207:
1.88 nicm 208: set_signals(server_signal_callback);
1.66 nicm 209: server_loop();
210: exit(0);
1.1 nicm 211: }
212:
213: /* Main server loop. */
1.66 nicm 214: void
215: server_loop(void)
1.1 nicm 216: {
1.66 nicm 217: while (!server_should_shutdown()) {
218: event_loop(EVLOOP_ONCE);
1.1 nicm 219:
1.60 nicm 220: server_window_loop();
221: server_client_loop();
1.1 nicm 222:
1.8 nicm 223: key_bindings_clean();
1.66 nicm 224: server_clean_dead();
1.80 nicm 225: }
1.66 nicm 226: }
1.31 nicm 227:
1.66 nicm 228: /* Check if the server should be shutting down (no more clients or windows). */
229: int
230: server_should_shutdown(void)
231: {
232: u_int i;
1.1 nicm 233:
234: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
235: if (ARRAY_ITEM(&sessions, i) != NULL)
1.66 nicm 236: return (0);
1.1 nicm 237: }
238: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
239: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 240: return (0);
1.1 nicm 241: }
1.66 nicm 242: return (1);
1.1 nicm 243: }
244:
1.66 nicm 245: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 246: void
1.66 nicm 247: server_send_shutdown(void)
1.1 nicm 248: {
1.66 nicm 249: struct client *c;
1.1 nicm 250: struct session *s;
1.66 nicm 251: u_int i;
1.1 nicm 252:
1.42 nicm 253: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
254: c = ARRAY_ITEM(&clients, i);
255: if (c != NULL) {
256: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 257: server_client_lost(c);
1.42 nicm 258: else
259: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 260: c->session = NULL;
1.42 nicm 261: }
262: }
263:
1.1 nicm 264: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 265: if ((s = ARRAY_ITEM(&sessions, i)) != NULL)
1.1 nicm 266: session_destroy(s);
267: }
1.42 nicm 268: }
269:
1.66 nicm 270: /* Free dead, unreferenced clients and sessions. */
271: void
272: server_clean_dead(void)
273: {
274: struct session *s;
275: struct client *c;
276: u_int i;
277:
278: for (i = 0; i < ARRAY_LENGTH(&dead_sessions); i++) {
279: s = ARRAY_ITEM(&dead_sessions, i);
280: if (s == NULL || s->references != 0)
281: continue;
282: ARRAY_SET(&dead_sessions, i, NULL);
283: xfree(s);
284: }
285:
286: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
287: c = ARRAY_ITEM(&dead_clients, i);
288: if (c == NULL || c->references != 0)
289: continue;
290: ARRAY_SET(&dead_clients, i, NULL);
291: xfree(c);
292: }
293: }
294:
295: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 296: void
1.66 nicm 297: server_update_socket(void)
1.42 nicm 298: {
1.66 nicm 299: struct session *s;
300: u_int i;
301: static int last = -1;
302: int n;
1.1 nicm 303:
1.66 nicm 304: n = 0;
1.42 nicm 305: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.66 nicm 306: s = ARRAY_ITEM(&sessions, i);
307: if (s != NULL && !(s->flags & SESSION_UNATTACHED)) {
308: n++;
309: break;
310: }
311: }
312:
313: if (n != last) {
314: last = n;
315: if (n != 0)
1.89 nicm 316: chmod(socket_path, S_IRWXU|S_IRWXG);
1.66 nicm 317: else
1.89 nicm 318: chmod(socket_path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
1.66 nicm 319: }
320: }
321:
322: /* Callback for server socket. */
1.78 nicm 323: /* ARGSUSED */
1.66 nicm 324: void
325: server_accept_callback(int fd, short events, unused void *data)
326: {
327: struct sockaddr_storage sa;
328: socklen_t slen = sizeof sa;
329: int newfd;
330:
331: if (!(events & EV_READ))
332: return;
333:
334: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
335: if (newfd == -1) {
336: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
337: return;
338: fatal("accept failed");
339: }
340: if (server_shutdown) {
341: close(newfd);
342: return;
1.42 nicm 343: }
1.66 nicm 344: server_client_create(newfd);
345: }
346:
347: /* Signal handler. */
1.78 nicm 348: /* ARGSUSED */
1.66 nicm 349: void
350: server_signal_callback(int sig, unused short events, unused void *data)
351: {
352: switch (sig) {
353: case SIGTERM:
354: server_shutdown = 1;
355: server_send_shutdown();
356: break;
357: case SIGCHLD:
358: server_child_signal();
359: break;
360: case SIGUSR1:
361: event_del(&server_ev_accept);
362: close(server_fd);
363: server_fd = server_create_socket();
364: event_set(&server_ev_accept, server_fd,
365: EV_READ|EV_PERSIST, server_accept_callback, NULL);
366: event_add(&server_ev_accept, NULL);
367: break;
1.1 nicm 368: }
369: }
370:
371: /* Handle SIGCHLD. */
372: void
373: server_child_signal(void)
374: {
1.66 nicm 375: int status;
376: pid_t pid;
1.1 nicm 377:
378: for (;;) {
379: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
380: case -1:
381: if (errno == ECHILD)
382: return;
1.39 nicm 383: fatal("waitpid failed");
1.1 nicm 384: case 0:
385: return;
386: }
1.66 nicm 387: if (WIFSTOPPED(status))
388: server_child_stopped(pid, status);
1.79 nicm 389: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 390: server_child_exited(pid, status);
391: }
392: }
393:
394: /* Handle exited children. */
395: void
396: server_child_exited(pid_t pid, int status)
397: {
398: struct window *w;
399: struct window_pane *wp;
400: struct job *job;
401: u_int i;
402:
403: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
404: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
405: continue;
406: TAILQ_FOREACH(wp, &w->panes, entry) {
407: if (wp->pid == pid) {
1.77 nicm 408: server_destroy_pane(wp);
409: break;
1.53 nicm 410: }
411: }
1.80 nicm 412: }
1.1 nicm 413:
1.66 nicm 414: SLIST_FOREACH(job, &all_jobs, lentry) {
415: if (pid == job->pid) {
1.67 nicm 416: job_died(job, status); /* might free job */
417: break;
1.1 nicm 418: }
1.53 nicm 419: }
420: }
421:
1.66 nicm 422: /* Handle stopped children. */
1.31 nicm 423: void
1.66 nicm 424: server_child_stopped(pid_t pid, int status)
1.31 nicm 425: {
1.66 nicm 426: struct window *w;
427: struct window_pane *wp;
428: u_int i;
1.31 nicm 429:
1.66 nicm 430: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
431: return;
1.31 nicm 432:
1.66 nicm 433: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
434: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 435: continue;
1.66 nicm 436: TAILQ_FOREACH(wp, &w->panes, entry) {
437: if (wp->pid == pid) {
438: if (killpg(pid, SIGCONT) != 0)
439: kill(pid, SIGCONT);
440: }
441: }
1.31 nicm 442: }
1.1 nicm 443: }
444:
1.66 nicm 445: /* Handle once-per-second timer events. */
1.78 nicm 446: /* ARGSUSED */
1.1 nicm 447: void
1.66 nicm 448: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 449: {
1.60 nicm 450: struct window *w;
451: struct window_pane *wp;
1.66 nicm 452: struct timeval tv;
1.35 nicm 453: u_int i;
1.1 nicm 454:
1.60 nicm 455: if (options_get_number(&global_s_options, "lock-server"))
456: server_lock_server();
457: else
458: server_lock_sessions();
1.1 nicm 459:
1.60 nicm 460: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
461: w = ARRAY_ITEM(&windows, i);
462: if (w == NULL)
1.1 nicm 463: continue;
464:
1.60 nicm 465: TAILQ_FOREACH(wp, &w->panes, entry) {
466: if (wp->mode != NULL && wp->mode->timer != NULL)
467: wp->mode->timer(wp);
1.1 nicm 468: }
469: }
1.72 nicm 470:
471: server_client_status_timer();
1.66 nicm 472:
473: evtimer_del(&server_ev_second);
474: memset(&tv, 0, sizeof tv);
475: tv.tv_sec = 1;
476: evtimer_add(&server_ev_second, &tv);
1.1 nicm 477: }
478:
1.46 nicm 479: /* Lock the server if ALL sessions have hit the time limit. */
480: void
481: server_lock_server(void)
482: {
483: struct session *s;
484: u_int i;
485: int timeout;
486: time_t t;
487:
488: t = time(NULL);
489: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
490: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
491: continue;
492:
1.59 nicm 493: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 494: if (gettimeofday(&s->activity_time, NULL) != 0)
495: fatal("gettimeofday failed");
1.59 nicm 496: continue;
497: }
498:
1.46 nicm 499: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 500: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 501: return; /* not timed out */
502: }
503:
504: server_lock();
505: recalculate_sizes();
506: }
507:
508: /* Lock any sessions which have timed out. */
509: void
510: server_lock_sessions(void)
511: {
1.80 nicm 512: struct session *s;
1.62 deraadt 513: u_int i;
1.46 nicm 514: int timeout;
1.62 deraadt 515: time_t t;
1.46 nicm 516:
1.62 deraadt 517: t = time(NULL);
518: for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
1.46 nicm 519: if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
520: continue;
1.59 nicm 521:
522: if (s->flags & SESSION_UNATTACHED) {
1.65 nicm 523: if (gettimeofday(&s->activity_time, NULL) != 0)
524: fatal("gettimeofday failed");
1.59 nicm 525: continue;
526: }
1.46 nicm 527:
528: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 529: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 530: server_lock_session(s);
531: recalculate_sizes();
1.1 nicm 532: }
533: }
534: }
![[BACK]](/icons/back.gif){kind=icon}
Return to server.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / tmux