Annotation of src/usr.bin/tmux/server.c, Revision 1.133
1.133 ! nicm 1: /* $OpenBSD: server.c,v 1.132 2015/08/28 12:25:42 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 <termios.h>
35: #include <time.h>
36: #include <unistd.h>
37:
38: #include "tmux.h"
39:
40: /*
41: * Main server functions.
42: */
43:
44: struct clients clients;
45:
1.66 nicm 46: int server_fd;
47: int server_shutdown;
48: struct event server_ev_accept;
49: struct event server_ev_second;
1.45 nicm 50:
1.126 nicm 51: struct session *marked_session;
52: struct winlink *marked_winlink;
53: struct window *marked_window;
54: struct window_pane *marked_window_pane;
55: struct layout_cell *marked_layout_cell;
56:
57: int server_create_socket(void);
58: void server_loop(void);
59: int server_should_shutdown(void);
60: void server_send_shutdown(void);
61: void server_accept_callback(int, short, void *);
62: void server_signal_callback(int, short, void *);
63: void server_child_signal(void);
64: void server_child_exited(pid_t, int);
65: void server_child_stopped(pid_t, int);
66: void server_second_callback(int, short, void *);
67: void server_lock_sessions(void);
68:
69: /* Set marked pane. */
70: void
71: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
72: {
73: marked_session = s;
74: marked_winlink = wl;
75: marked_window = wl->window;
76: marked_window_pane = wp;
77: marked_layout_cell = wp->layout_cell;
78: }
79:
80: /* Clear marked pane. */
81: void
82: server_clear_marked(void)
83: {
84: marked_session = NULL;
85: marked_winlink = NULL;
86: marked_window = NULL;
87: marked_window_pane = NULL;
88: marked_layout_cell = NULL;
89: }
90:
91: /* Is this the marked pane? */
92: int
93: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
94: {
95: if (s == NULL || wl == NULL || wp == NULL)
96: return (0);
97: if (marked_session != s || marked_winlink != wl)
98: return (0);
99: if (marked_window_pane != wp)
100: return (0);
101: return (server_check_marked());
102: }
103:
104: /* Check if the marked pane is still valid. */
105: int
106: server_check_marked(void)
107: {
108: struct winlink *wl;
109:
110: if (marked_window_pane == NULL)
111: return (0);
112: if (marked_layout_cell != marked_window_pane->layout_cell)
113: return (0);
114:
115: if (!session_alive(marked_session))
116: return (0);
117: RB_FOREACH(wl, winlinks, &marked_session->windows) {
118: if (wl->window == marked_window && wl == marked_winlink)
119: break;
120: }
121: if (wl == NULL)
122: return (0);
123:
124: if (!window_has_pane(marked_window, marked_window_pane))
125: return (0);
126: return (window_pane_visible(marked_window_pane));
127: }
1.45 nicm 128:
1.60 nicm 129: /* Create server socket. */
130: int
131: server_create_socket(void)
1.1 nicm 132: {
1.60 nicm 133: struct sockaddr_un sa;
134: size_t size;
135: mode_t mask;
1.100 nicm 136: int fd;
1.60 nicm 137:
138: memset(&sa, 0, sizeof sa);
139: sa.sun_family = AF_UNIX;
140: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
141: if (size >= sizeof sa.sun_path) {
142: errno = ENAMETOOLONG;
1.119 nicm 143: return (-1);
1.60 nicm 144: }
145: unlink(sa.sun_path);
146:
147: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.119 nicm 148: return (-1);
1.60 nicm 149:
1.89 nicm 150: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.60 nicm 151: if (bind(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
1.119 nicm 152: return (-1);
1.60 nicm 153: umask(mask);
154:
155: if (listen(fd, 16) == -1)
1.119 nicm 156: return (-1);
1.100 nicm 157: setblocking(fd, 0);
1.1 nicm 158:
1.60 nicm 159: return (fd);
160: }
161:
1.1 nicm 162: /* Fork new server. */
163: int
1.103 nicm 164: server_start(int lockfd, char *lockfile)
1.1 nicm 165: {
1.109 nicm 166: int pair[2];
167: struct timeval tv;
168: char *cause;
1.1 nicm 169:
170: /* The first client is special and gets a socketpair; create it. */
171: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
172: fatal("socketpair failed");
1.115 nicm 173: log_debug("starting server");
1.1 nicm 174:
175: switch (fork()) {
176: case -1:
177: fatal("fork failed");
178: case 0:
179: break;
180: default:
181: close(pair[1]);
182: return (pair[0]);
183: }
184: close(pair[0]);
185:
186: /*
187: * Must daemonise before loading configuration as the PID changes so
188: * $TMUX would be wrong for sessions created in the config file.
189: */
1.16 nicm 190: if (daemon(1, 0) != 0)
1.1 nicm 191: fatal("daemon failed");
192:
1.88 nicm 193: /* event_init() was called in our parent, need to reinit. */
1.125 nicm 194: clear_signals(0);
1.88 nicm 195: if (event_reinit(ev_base) != 0)
196: fatal("event_reinit failed");
197:
1.16 nicm 198: logfile("server");
199: log_debug("server started, pid %ld", (long) getpid());
200:
1.121 nicm 201: RB_INIT(&windows);
1.102 nicm 202: RB_INIT(&all_window_panes);
1.122 nicm 203: TAILQ_INIT(&clients);
1.97 nicm 204: RB_INIT(&sessions);
1.47 nicm 205: TAILQ_INIT(&session_groups);
1.15 nicm 206: mode_key_init_trees();
1.1 nicm 207: key_bindings_init();
208: utf8_build();
209:
210: start_time = time(NULL);
1.16 nicm 211: log_debug("socket path %s", socket_path);
1.96 nicm 212: setproctitle("server (%s)", socket_path);
1.16 nicm 213:
1.66 nicm 214: server_fd = server_create_socket();
1.119 nicm 215: if (server_fd == -1)
216: fatal("couldn't create socket");
217: server_update_socket();
1.60 nicm 218: server_client_create(pair[1]);
1.103 nicm 219:
220: unlink(lockfile);
1.105 nicm 221: free(lockfile);
1.103 nicm 222: close(lockfd);
1.16 nicm 223:
1.109 nicm 224: cfg_cmd_q = cmdq_new(NULL);
225: cfg_cmd_q->emptyfn = cfg_default_done;
226: cfg_finished = 0;
227: cfg_references = 1;
1.122 nicm 228: cfg_client = TAILQ_FIRST(&clients);
1.111 nicm 229: if (cfg_client != NULL)
230: cfg_client->references++;
1.109 nicm 231:
1.110 nicm 232: if (access(TMUX_CONF, R_OK) == 0) {
1.117 nicm 233: if (load_cfg(TMUX_CONF, cfg_cmd_q, &cause) == -1)
234: cfg_add_cause("%s: %s", TMUX_CONF, cause);
235: } else if (errno != ENOENT)
236: cfg_add_cause("%s: %s", TMUX_CONF, strerror(errno));
1.109 nicm 237: if (cfg_file != NULL) {
1.117 nicm 238: if (load_cfg(cfg_file, cfg_cmd_q, &cause) == -1)
239: cfg_add_cause("%s: %s", cfg_file, cause);
1.109 nicm 240: }
241: cmdq_continue(cfg_cmd_q);
1.129 nicm 242: status_prompt_load_history();
1.66 nicm 243:
1.104 nicm 244: server_add_accept(0);
1.66 nicm 245:
246: memset(&tv, 0, sizeof tv);
247: tv.tv_sec = 1;
248: evtimer_set(&server_ev_second, server_second_callback, NULL);
249: evtimer_add(&server_ev_second, &tv);
250:
1.88 nicm 251: set_signals(server_signal_callback);
1.66 nicm 252: server_loop();
1.129 nicm 253: status_prompt_save_history();
1.66 nicm 254: exit(0);
1.1 nicm 255: }
256:
257: /* Main server loop. */
1.66 nicm 258: void
259: server_loop(void)
1.1 nicm 260: {
1.66 nicm 261: while (!server_should_shutdown()) {
262: event_loop(EVLOOP_ONCE);
1.1 nicm 263:
1.60 nicm 264: server_window_loop();
265: server_client_loop();
1.80 nicm 266: }
1.66 nicm 267: }
1.31 nicm 268:
1.112 nicm 269: /* Check if the server should exit (no more clients or sessions). */
1.66 nicm 270: int
271: server_should_shutdown(void)
272: {
1.116 nicm 273: struct client *c;
1.1 nicm 274:
1.94 nicm 275: if (!options_get_number(&global_options, "exit-unattached")) {
1.97 nicm 276: if (!RB_EMPTY(&sessions))
277: return (0);
1.1 nicm 278: }
1.116 nicm 279:
1.122 nicm 280: TAILQ_FOREACH(c, &clients, entry) {
281: if (c->session != NULL)
1.116 nicm 282: return (0);
283: }
284:
285: /*
286: * No attached clients therefore want to exit - flush any waiting
287: * clients but don't actually exit until they've gone.
288: */
289: cmd_wait_for_flush();
1.122 nicm 290: if (!TAILQ_EMPTY(&clients))
291: return (0);
1.116 nicm 292:
1.66 nicm 293: return (1);
1.1 nicm 294: }
295:
1.66 nicm 296: /* Shutdown the server by killing all clients and windows. */
1.1 nicm 297: void
1.66 nicm 298: server_send_shutdown(void)
1.1 nicm 299: {
1.122 nicm 300: struct client *c, *c1;
301: struct session *s, *s1;
1.116 nicm 302:
303: cmd_wait_for_flush();
1.1 nicm 304:
1.122 nicm 305: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
306: if (c->flags & (CLIENT_BAD|CLIENT_SUSPENDED))
307: server_client_lost(c);
308: else
309: server_write_client(c, MSG_SHUTDOWN, NULL, 0);
310: c->session = NULL;
1.42 nicm 311: }
312:
1.122 nicm 313: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 314: session_destroy(s);
1.66 nicm 315: }
316:
317: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 318: void
1.66 nicm 319: server_update_socket(void)
1.42 nicm 320: {
1.66 nicm 321: struct session *s;
322: static int last = -1;
1.93 nicm 323: int n, mode;
324: struct stat sb;
1.1 nicm 325:
1.66 nicm 326: n = 0;
1.97 nicm 327: RB_FOREACH(s, sessions, &sessions) {
328: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 329: n++;
330: break;
331: }
332: }
333:
334: if (n != last) {
335: last = n;
1.93 nicm 336:
337: if (stat(socket_path, &sb) != 0)
338: return;
339: mode = sb.st_mode;
340: if (n != 0) {
341: if (mode & S_IRUSR)
342: mode |= S_IXUSR;
343: if (mode & S_IRGRP)
344: mode |= S_IXGRP;
345: if (mode & S_IROTH)
346: mode |= S_IXOTH;
347: } else
348: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
349: chmod(socket_path, mode);
1.66 nicm 350: }
351: }
352:
353: /* Callback for server socket. */
354: void
355: server_accept_callback(int fd, short events, unused void *data)
356: {
357: struct sockaddr_storage sa;
358: socklen_t slen = sizeof sa;
359: int newfd;
360:
1.104 nicm 361: server_add_accept(0);
1.66 nicm 362: if (!(events & EV_READ))
363: return;
364:
365: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
366: if (newfd == -1) {
367: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
368: return;
1.104 nicm 369: if (errno == ENFILE || errno == EMFILE) {
370: /* Delete and don't try again for 1 second. */
371: server_add_accept(1);
372: return;
373: }
1.66 nicm 374: fatal("accept failed");
375: }
376: if (server_shutdown) {
377: close(newfd);
378: return;
1.42 nicm 379: }
1.66 nicm 380: server_client_create(newfd);
381: }
382:
1.104 nicm 383: /*
384: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
385: * event - used to backoff when running out of file descriptors.
386: */
387: void
388: server_add_accept(int timeout)
389: {
390: struct timeval tv = { timeout, 0 };
391:
392: if (event_initialized(&server_ev_accept))
393: event_del(&server_ev_accept);
394:
395: if (timeout == 0) {
396: event_set(&server_ev_accept,
397: server_fd, EV_READ, server_accept_callback, NULL);
398: event_add(&server_ev_accept, NULL);
399: } else {
400: event_set(&server_ev_accept,
401: server_fd, EV_TIMEOUT, server_accept_callback, NULL);
402: event_add(&server_ev_accept, &tv);
403: }
404: }
405:
1.66 nicm 406: /* Signal handler. */
407: void
408: server_signal_callback(int sig, unused short events, unused void *data)
409: {
1.119 nicm 410: int fd;
1.120 nicm 411:
1.66 nicm 412: switch (sig) {
413: case SIGTERM:
414: server_shutdown = 1;
415: server_send_shutdown();
416: break;
417: case SIGCHLD:
418: server_child_signal();
419: break;
420: case SIGUSR1:
421: event_del(&server_ev_accept);
1.119 nicm 422: fd = server_create_socket();
423: if (fd != -1) {
424: close(server_fd);
425: server_fd = fd;
426: server_update_socket();
427: }
1.104 nicm 428: server_add_accept(0);
1.66 nicm 429: break;
1.1 nicm 430: }
431: }
432:
433: /* Handle SIGCHLD. */
434: void
435: server_child_signal(void)
436: {
1.66 nicm 437: int status;
438: pid_t pid;
1.1 nicm 439:
440: for (;;) {
441: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
442: case -1:
443: if (errno == ECHILD)
444: return;
1.39 nicm 445: fatal("waitpid failed");
1.1 nicm 446: case 0:
447: return;
448: }
1.66 nicm 449: if (WIFSTOPPED(status))
450: server_child_stopped(pid, status);
1.79 nicm 451: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 452: server_child_exited(pid, status);
453: }
454: }
455:
456: /* Handle exited children. */
457: void
458: server_child_exited(pid_t pid, int status)
459: {
1.121 nicm 460: struct window *w, *w1;
1.66 nicm 461: struct window_pane *wp;
462: struct job *job;
463:
1.121 nicm 464: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 465: TAILQ_FOREACH(wp, &w->panes, entry) {
466: if (wp->pid == pid) {
1.118 nicm 467: wp->status = status;
1.77 nicm 468: server_destroy_pane(wp);
469: break;
1.53 nicm 470: }
471: }
1.80 nicm 472: }
1.1 nicm 473:
1.101 nicm 474: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 475: if (pid == job->pid) {
1.67 nicm 476: job_died(job, status); /* might free job */
477: break;
1.1 nicm 478: }
1.53 nicm 479: }
480: }
481:
1.66 nicm 482: /* Handle stopped children. */
1.31 nicm 483: void
1.66 nicm 484: server_child_stopped(pid_t pid, int status)
1.31 nicm 485: {
1.66 nicm 486: struct window *w;
487: struct window_pane *wp;
1.31 nicm 488:
1.66 nicm 489: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
490: return;
1.31 nicm 491:
1.121 nicm 492: RB_FOREACH(w, windows, &windows) {
1.66 nicm 493: TAILQ_FOREACH(wp, &w->panes, entry) {
494: if (wp->pid == pid) {
495: if (killpg(pid, SIGCONT) != 0)
496: kill(pid, SIGCONT);
497: }
498: }
1.31 nicm 499: }
1.1 nicm 500: }
501:
1.66 nicm 502: /* Handle once-per-second timer events. */
1.1 nicm 503: void
1.66 nicm 504: server_second_callback(unused int fd, unused short events, unused void *arg)
1.1 nicm 505: {
1.66 nicm 506: struct timeval tv;
1.1 nicm 507:
1.133 ! nicm 508: server_lock_sessions();
1.66 nicm 509:
510: evtimer_del(&server_ev_second);
511: memset(&tv, 0, sizeof tv);
512: tv.tv_sec = 1;
513: evtimer_add(&server_ev_second, &tv);
1.46 nicm 514: }
515:
516: /* Lock any sessions which have timed out. */
517: void
518: server_lock_sessions(void)
519: {
1.80 nicm 520: struct session *s;
1.46 nicm 521: int timeout;
1.62 deraadt 522: time_t t;
1.46 nicm 523:
1.62 deraadt 524: t = time(NULL);
1.97 nicm 525: RB_FOREACH(s, sessions, &sessions) {
1.99 nicm 526: if (s->flags & SESSION_UNATTACHED)
1.59 nicm 527: continue;
1.46 nicm 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: }
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