Annotation of src/usr.bin/tmux/server.c, Revision 1.100
1.100 ! nicm 1: /* $OpenBSD: server.c,v 1.99 2011/01/01 01:12:09 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
1.96 nicm 107: server_start(void)
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);
146: ARRAY_INIT(&clients);
1.31 nicm 147: ARRAY_INIT(&dead_clients);
1.97 nicm 148: RB_INIT(&sessions);
149: RB_INIT(&dead_sessions);
1.47 nicm 150: TAILQ_INIT(&session_groups);
1.98 nicm 151: ARRAY_INIT(&global_buffers);
1.15 nicm 152: mode_key_init_trees();
1.1 nicm 153: key_bindings_init();
154: utf8_build();
155:
156: start_time = time(NULL);
1.16 nicm 157: log_debug("socket path %s", socket_path);
1.96 nicm 158: setproctitle("server (%s)", socket_path);
1.16 nicm 159:
1.66 nicm 160: server_fd = server_create_socket();
1.60 nicm 161: server_client_create(pair[1]);
1.16 nicm 162:
1.82 nicm 163: if (access(SYSTEM_CFG, R_OK) == 0)
1.83 nicm 164: load_cfg(SYSTEM_CFG, NULL, &cfg_causes);
1.82 nicm 165: else if (errno != ENOENT) {
1.83 nicm 166: cfg_add_cause(
167: &cfg_causes, "%s: %s", strerror(errno), SYSTEM_CFG);
1.64 nicm 168: }
1.82 nicm 169: if (cfg_file != NULL)
1.83 nicm 170: load_cfg(cfg_file, NULL, &cfg_causes);
1.82 nicm 171:
172: /*
173: * If there is a session already, put the current window and pane into
174: * more mode.
175: */
1.97 nicm 176: if (!RB_EMPTY(&sessions) && !ARRAY_EMPTY(&cfg_causes)) {
177: wp = RB_MIN(sessions, &sessions)->curw->window->active;
1.85 nicm 178: window_pane_set_mode(wp, &window_copy_mode);
179: window_copy_init_for_output(wp);
1.83 nicm 180: for (i = 0; i < ARRAY_LENGTH(&cfg_causes); i++) {
181: cause = ARRAY_ITEM(&cfg_causes, i);
1.85 nicm 182: window_copy_add(wp, "%s", cause);
1.83 nicm 183: xfree(cause);
1.82 nicm 184: }
1.83 nicm 185: ARRAY_FREE(&cfg_causes);
1.82 nicm 186: }
187: cfg_finished = 1;
1.66 nicm 188:
189: event_set(&server_ev_accept,
190: server_fd, EV_READ|EV_PERSIST, server_accept_callback, NULL);
191: event_add(&server_ev_accept, NULL);
192:
193: memset(&tv, 0, sizeof tv);
194: tv.tv_sec = 1;
195: evtimer_set(&server_ev_second, server_second_callback, NULL);
196: evtimer_add(&server_ev_second, &tv);
197:
1.88 nicm 198: set_signals(server_signal_callback);
1.66 nicm 199: server_loop();
200: exit(0);
1.1 nicm 201: }
202:
203: /* Main server loop. */
1.66 nicm 204: void
205: server_loop(void)
1.1 nicm 206: {
1.66 nicm 207: while (!server_should_shutdown()) {
208: event_loop(EVLOOP_ONCE);
1.1 nicm 209:
1.60 nicm 210: server_window_loop();
211: server_client_loop();
1.1 nicm 212:
1.8 nicm 213: key_bindings_clean();
1.66 nicm 214: server_clean_dead();
1.80 nicm 215: }
1.66 nicm 216: }
1.31 nicm 217:
1.94 nicm 218: /* Check if the server should be shutting down (no more clients or sessions). */
1.66 nicm 219: int
220: server_should_shutdown(void)
221: {
222: u_int i;
1.1 nicm 223:
1.94 nicm 224: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 225: if (!RB_EMPTY(&sessions))
226: return (0);
1.1 nicm 227: }
228: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
229: if (ARRAY_ITEM(&clients, i) != NULL)
1.66 nicm 230: return (0);
1.1 nicm 231: }
1.66 nicm 232: return (1);
1.1 nicm 233: }
234:
1.66 nicm 235: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 236: void
1.66 nicm 237: server_send_shutdown(void)
1.1 nicm 238: {
1.66 nicm 239: struct client *c;
1.97 nicm 240: struct session *s, *next_s;
1.66 nicm 241: u_int i;
1.1 nicm 242:
1.42 nicm 243: for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
244: c = ARRAY_ITEM(&clients, i);
245: if (c != NULL) {
246: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
1.60 nicm 247: server_client_lost(c);
1.42 nicm 248: else
249: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
1.66 nicm 250: c->session = NULL;
1.42 nicm 251: }
252: }
253:
1.97 nicm 254: s = RB_MIN(sessions, &sessions);
255: while (s != NULL) {
256: next_s = RB_NEXT(sessions, &sessions, s);
257: session_destroy(s);
258: s = next_s;
1.1 nicm 259: }
1.42 nicm 260: }
261:
1.66 nicm 262: /* Free dead, unreferenced clients and sessions. */
263: void
264: server_clean_dead(void)
265: {
1.97 nicm 266: struct session *s, *next_s;
1.66 nicm 267: struct client *c;
268: u_int i;
269:
1.97 nicm 270: s = RB_MIN(sessions, &dead_sessions);
271: while (s != NULL) {
272: next_s = RB_NEXT(sessions, &dead_sessions, s);
273: if (s->references == 0) {
274: RB_REMOVE(sessions, &dead_sessions, s);
275: xfree(s->name);
276: xfree(s);
277: }
278: s = next_s;
1.66 nicm 279: }
280:
281: for (i = 0; i < ARRAY_LENGTH(&dead_clients); i++) {
282: c = ARRAY_ITEM(&dead_clients, i);
283: if (c == NULL || c->references != 0)
284: continue;
285: ARRAY_SET(&dead_clients, i, NULL);
286: xfree(c);
287: }
288: }
289:
290: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 291: void
1.66 nicm 292: server_update_socket(void)
1.42 nicm 293: {
1.66 nicm 294: struct session *s;
295: static int last = -1;
1.93 nicm 296: int n, mode;
297: struct stat sb;
1.1 nicm 298:
1.66 nicm 299: n = 0;
1.97 nicm 300: RB_FOREACH(s, sessions, &sessions) {
301: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 302: n++;
303: break;
304: }
305: }
306:
307: if (n != last) {
308: last = n;
1.93 nicm 309:
310: if (stat(socket_path, &sb) != 0)
311: return;
312: mode = sb.st_mode;
313: if (n != 0) {
314: if (mode & S_IRUSR)
315: mode |= S_IXUSR;
316: if (mode & S_IRGRP)
317: mode |= S_IXGRP;
318: if (mode & S_IROTH)
319: mode |= S_IXOTH;
320: } else
321: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
322: chmod(socket_path, mode);
1.66 nicm 323: }
324: }
325:
326: /* Callback for server socket. */
1.78 nicm 327: /* ARGSUSED */
1.66 nicm 328: void
329: server_accept_callback(int fd, short events, unused void *data)
330: {
331: struct sockaddr_storage sa;
332: socklen_t slen = sizeof sa;
333: int newfd;
334:
335: if (!(events & EV_READ))
336: return;
337:
338: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
339: if (newfd == -1) {
340: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
341: return;
342: fatal("accept failed");
343: }
344: if (server_shutdown) {
345: close(newfd);
346: return;
1.42 nicm 347: }
1.66 nicm 348: server_client_create(newfd);
349: }
350:
351: /* Signal handler. */
1.78 nicm 352: /* ARGSUSED */
1.66 nicm 353: void
354: server_signal_callback(int sig, unused short events, unused void *data)
355: {
356: switch (sig) {
357: case SIGTERM:
358: server_shutdown = 1;
359: server_send_shutdown();
360: break;
361: case SIGCHLD:
362: server_child_signal();
363: break;
364: case SIGUSR1:
365: event_del(&server_ev_accept);
366: close(server_fd);
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);
371: break;
1.1 nicm 372: }
373: }
374:
375: /* Handle SIGCHLD. */
376: void
377: server_child_signal(void)
378: {
1.66 nicm 379: int status;
380: pid_t pid;
1.1 nicm 381:
382: for (;;) {
383: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
384: case -1:
385: if (errno == ECHILD)
386: return;
1.39 nicm 387: fatal("waitpid failed");
1.1 nicm 388: case 0:
389: return;
390: }
1.66 nicm 391: if (WIFSTOPPED(status))
392: server_child_stopped(pid, status);
1.79 nicm 393: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 394: server_child_exited(pid, status);
395: }
396: }
397:
398: /* Handle exited children. */
399: void
400: server_child_exited(pid_t pid, int status)
401: {
402: struct window *w;
403: struct window_pane *wp;
404: struct job *job;
405: u_int i;
406:
407: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
408: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
409: continue;
410: TAILQ_FOREACH(wp, &w->panes, entry) {
411: if (wp->pid == pid) {
1.77 nicm 412: server_destroy_pane(wp);
413: break;
1.53 nicm 414: }
415: }
1.80 nicm 416: }
1.1 nicm 417:
1.66 nicm 418: SLIST_FOREACH(job, &all_jobs, lentry) {
419: if (pid == job->pid) {
1.67 nicm 420: job_died(job, status); /* might free job */
421: break;
1.1 nicm 422: }
1.53 nicm 423: }
424: }
425:
1.66 nicm 426: /* Handle stopped children. */
1.31 nicm 427: void
1.66 nicm 428: server_child_stopped(pid_t pid, int status)
1.31 nicm 429: {
1.66 nicm 430: struct window *w;
431: struct window_pane *wp;
432: u_int i;
1.31 nicm 433:
1.66 nicm 434: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
435: return;
1.31 nicm 436:
1.66 nicm 437: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
438: if ((w = ARRAY_ITEM(&windows, i)) == NULL)
1.31 nicm 439: continue;
1.66 nicm 440: TAILQ_FOREACH(wp, &w->panes, entry) {
441: if (wp->pid == pid) {
442: if (killpg(pid, SIGCONT) != 0)
443: kill(pid, SIGCONT);
444: }
445: }
1.31 nicm 446: }
1.1 nicm 447: }
448:
1.66 nicm 449: /* Handle once-per-second timer events. */
1.78 nicm 450: /* ARGSUSED */
1.1 nicm 451: void
1.66 nicm 452: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 453: {
1.60 nicm 454: struct window *w;
455: struct window_pane *wp;
1.66 nicm 456: struct timeval tv;
1.35 nicm 457: u_int i;
1.1 nicm 458:
1.60 nicm 459: if (options_get_number(&global_s_options, "lock-server"))
460: server_lock_server();
461: else
462: server_lock_sessions();
1.1 nicm 463:
1.60 nicm 464: for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
465: w = ARRAY_ITEM(&windows, i);
466: if (w == NULL)
1.1 nicm 467: continue;
468:
1.60 nicm 469: TAILQ_FOREACH(wp, &w->panes, entry) {
470: if (wp->mode != NULL && wp->mode->timer != NULL)
471: wp->mode->timer(wp);
1.1 nicm 472: }
473: }
1.72 nicm 474:
475: server_client_status_timer();
1.66 nicm 476:
477: evtimer_del(&server_ev_second);
478: memset(&tv, 0, sizeof tv);
479: tv.tv_sec = 1;
480: evtimer_add(&server_ev_second, &tv);
1.1 nicm 481: }
482:
1.46 nicm 483: /* Lock the server if ALL sessions have hit the time limit. */
484: void
485: server_lock_server(void)
486: {
487: struct session *s;
488: int timeout;
489: time_t t;
490:
491: t = time(NULL);
1.97 nicm 492: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 493: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 494: continue;
1.46 nicm 495: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 496: if (timeout <= 0 || t <= s->activity_time.tv_sec + timeout)
1.46 nicm 497: return; /* not timed out */
498: }
499:
500: server_lock();
501: recalculate_sizes();
502: }
503:
504: /* Lock any sessions which have timed out. */
505: void
506: server_lock_sessions(void)
507: {
1.80 nicm 508: struct session *s;
1.46 nicm 509: int timeout;
1.62 deraadt 510: time_t t;
1.46 nicm 511:
1.62 deraadt 512: t = time(NULL);
1.97 nicm 513: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 514: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 515: continue;
1.46 nicm 516: timeout = options_get_number(&s->options, "lock-after-time");
1.65 nicm 517: if (timeout > 0 && t > s->activity_time.tv_sec + timeout) {
1.46 nicm 518: server_lock_session(s);
519: recalculate_sizes();
1.1 nicm 520: }
521: }
522: }
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