Annotation of src/usr.bin/tmux/server.c, Revision 1.154
1.154 ! nicm 1: /* $OpenBSD: server.c,v 1.153 2015/11/24 21:52:06 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:
1.144 nicm 46: struct tmuxproc *server_proc;
1.66 nicm 47: int server_fd;
1.141 nicm 48: int server_exit;
1.66 nicm 49: struct event server_ev_accept;
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);
1.144 nicm 58: int server_loop(void);
1.141 nicm 59: int server_should_exit(void);
60: void server_send_exit(void);
1.144 nicm 61: void server_accept(int, short, void *);
62: void server_signal(int);
1.126 nicm 63: void server_child_signal(void);
64: void server_child_exited(pid_t, int);
65: void server_child_stopped(pid_t, int);
66:
67: /* Set marked pane. */
68: void
69: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
70: {
71: marked_session = s;
72: marked_winlink = wl;
73: marked_window = wl->window;
74: marked_window_pane = wp;
75: marked_layout_cell = wp->layout_cell;
76: }
77:
78: /* Clear marked pane. */
79: void
80: server_clear_marked(void)
81: {
82: marked_session = NULL;
83: marked_winlink = NULL;
84: marked_window = NULL;
85: marked_window_pane = NULL;
86: marked_layout_cell = NULL;
87: }
88:
89: /* Is this the marked pane? */
90: int
91: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
92: {
93: if (s == NULL || wl == NULL || wp == NULL)
94: return (0);
95: if (marked_session != s || marked_winlink != wl)
96: return (0);
97: if (marked_window_pane != wp)
98: return (0);
99: return (server_check_marked());
100: }
101:
102: /* Check if the marked pane is still valid. */
103: int
104: server_check_marked(void)
105: {
106: struct winlink *wl;
107:
108: if (marked_window_pane == NULL)
109: return (0);
110: if (marked_layout_cell != marked_window_pane->layout_cell)
111: return (0);
112:
113: if (!session_alive(marked_session))
114: return (0);
115: RB_FOREACH(wl, winlinks, &marked_session->windows) {
116: if (wl->window == marked_window && wl == marked_winlink)
117: break;
118: }
119: if (wl == NULL)
120: return (0);
121:
122: if (!window_has_pane(marked_window, marked_window_pane))
123: return (0);
124: return (window_pane_visible(marked_window_pane));
125: }
1.45 nicm 126:
1.60 nicm 127: /* Create server socket. */
128: int
129: server_create_socket(void)
1.1 nicm 130: {
1.60 nicm 131: struct sockaddr_un sa;
132: size_t size;
133: mode_t mask;
1.100 nicm 134: int fd;
1.60 nicm 135:
136: memset(&sa, 0, sizeof sa);
137: sa.sun_family = AF_UNIX;
138: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
139: if (size >= sizeof sa.sun_path) {
140: errno = ENAMETOOLONG;
1.119 nicm 141: return (-1);
1.60 nicm 142: }
143: unlink(sa.sun_path);
144:
145: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.119 nicm 146: return (-1);
1.60 nicm 147:
1.89 nicm 148: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.140 guenther 149: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1)
1.119 nicm 150: return (-1);
1.60 nicm 151: umask(mask);
152:
153: if (listen(fd, 16) == -1)
1.119 nicm 154: return (-1);
1.100 nicm 155: setblocking(fd, 0);
1.1 nicm 156:
1.60 nicm 157: return (fd);
158: }
159:
1.1 nicm 160: /* Fork new server. */
161: int
1.138 nicm 162: server_start(struct event_base *base, int lockfd, char *lockfile)
1.1 nicm 163: {
1.139 nicm 164: int pair[2];
1.1 nicm 165:
166: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
167: fatal("socketpair failed");
168:
1.144 nicm 169: server_proc = proc_start("server", base, 1, server_signal);
170: if (server_proc == NULL) {
1.1 nicm 171: close(pair[1]);
172: return (pair[0]);
173: }
174: close(pair[0]);
1.143 nicm 175:
1.152 nicm 176: if (log_get_level() > 3)
1.146 nicm 177: tty_create_log();
1.151 nicm 178: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
179: "tty ps", NULL) != 0)
1.143 nicm 180: fatal("pledge failed");
1.1 nicm 181:
1.121 nicm 182: RB_INIT(&windows);
1.102 nicm 183: RB_INIT(&all_window_panes);
1.122 nicm 184: TAILQ_INIT(&clients);
1.97 nicm 185: RB_INIT(&sessions);
1.47 nicm 186: TAILQ_INIT(&session_groups);
1.15 nicm 187: mode_key_init_trees();
1.1 nicm 188: key_bindings_init();
189:
1.153 nicm 190: gettimeofday(&start_time, NULL);
1.16 nicm 191:
1.66 nicm 192: server_fd = server_create_socket();
1.119 nicm 193: if (server_fd == -1)
194: fatal("couldn't create socket");
195: server_update_socket();
1.60 nicm 196: server_client_create(pair[1]);
1.103 nicm 197:
1.154 ! nicm 198: if (lockfd >= 0) {
! 199: unlink(lockfile);
! 200: free(lockfile);
! 201: close(lockfd);
! 202: }
1.16 nicm 203:
1.139 nicm 204: start_cfg();
205:
1.129 nicm 206: status_prompt_load_history();
1.66 nicm 207:
1.104 nicm 208: server_add_accept(0);
1.66 nicm 209:
1.144 nicm 210: proc_loop(server_proc, server_loop);
1.129 nicm 211: status_prompt_save_history();
1.66 nicm 212: exit(0);
1.1 nicm 213: }
214:
1.144 nicm 215: /* Server loop callback. */
216: int
1.66 nicm 217: server_loop(void)
1.1 nicm 218: {
1.144 nicm 219: struct client *c;
1.31 nicm 220:
1.144 nicm 221: server_client_loop();
1.1 nicm 222:
1.145 nicm 223: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 224: if (!RB_EMPTY(&sessions))
225: return (0);
1.1 nicm 226: }
1.116 nicm 227:
1.122 nicm 228: TAILQ_FOREACH(c, &clients, entry) {
229: if (c->session != NULL)
1.116 nicm 230: return (0);
231: }
232:
233: /*
234: * No attached clients therefore want to exit - flush any waiting
235: * clients but don't actually exit until they've gone.
236: */
237: cmd_wait_for_flush();
1.122 nicm 238: if (!TAILQ_EMPTY(&clients))
239: return (0);
1.116 nicm 240:
1.66 nicm 241: return (1);
1.1 nicm 242: }
243:
1.141 nicm 244: /* Exit the server by killing all clients and windows. */
1.1 nicm 245: void
1.141 nicm 246: server_send_exit(void)
1.1 nicm 247: {
1.122 nicm 248: struct client *c, *c1;
249: struct session *s, *s1;
1.116 nicm 250:
251: cmd_wait_for_flush();
1.1 nicm 252:
1.122 nicm 253: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 254: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 255: server_client_lost(c);
256: else
1.144 nicm 257: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 258: c->session = NULL;
1.42 nicm 259: }
260:
1.122 nicm 261: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 262: session_destroy(s);
1.66 nicm 263: }
264:
265: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 266: void
1.66 nicm 267: server_update_socket(void)
1.42 nicm 268: {
1.66 nicm 269: struct session *s;
270: static int last = -1;
1.93 nicm 271: int n, mode;
272: struct stat sb;
1.1 nicm 273:
1.66 nicm 274: n = 0;
1.97 nicm 275: RB_FOREACH(s, sessions, &sessions) {
276: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 277: n++;
278: break;
279: }
280: }
281:
282: if (n != last) {
283: last = n;
1.93 nicm 284:
285: if (stat(socket_path, &sb) != 0)
286: return;
287: mode = sb.st_mode;
288: if (n != 0) {
289: if (mode & S_IRUSR)
290: mode |= S_IXUSR;
291: if (mode & S_IRGRP)
292: mode |= S_IXGRP;
293: if (mode & S_IROTH)
294: mode |= S_IXOTH;
295: } else
296: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
297: chmod(socket_path, mode);
1.66 nicm 298: }
299: }
300:
301: /* Callback for server socket. */
302: void
1.150 nicm 303: server_accept(int fd, short events, __unused void *data)
1.66 nicm 304: {
305: struct sockaddr_storage sa;
306: socklen_t slen = sizeof sa;
307: int newfd;
308:
1.104 nicm 309: server_add_accept(0);
1.66 nicm 310: if (!(events & EV_READ))
311: return;
312:
313: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
314: if (newfd == -1) {
315: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
316: return;
1.104 nicm 317: if (errno == ENFILE || errno == EMFILE) {
318: /* Delete and don't try again for 1 second. */
319: server_add_accept(1);
320: return;
321: }
1.66 nicm 322: fatal("accept failed");
323: }
1.141 nicm 324: if (server_exit) {
1.66 nicm 325: close(newfd);
326: return;
1.42 nicm 327: }
1.66 nicm 328: server_client_create(newfd);
329: }
330:
1.104 nicm 331: /*
332: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
333: * event - used to backoff when running out of file descriptors.
334: */
335: void
336: server_add_accept(int timeout)
337: {
338: struct timeval tv = { timeout, 0 };
339:
340: if (event_initialized(&server_ev_accept))
341: event_del(&server_ev_accept);
342:
343: if (timeout == 0) {
1.144 nicm 344: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
345: NULL);
1.104 nicm 346: event_add(&server_ev_accept, NULL);
347: } else {
1.144 nicm 348: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
349: server_accept, NULL);
1.104 nicm 350: event_add(&server_ev_accept, &tv);
351: }
352: }
353:
1.66 nicm 354: /* Signal handler. */
355: void
1.144 nicm 356: server_signal(int sig)
1.66 nicm 357: {
1.119 nicm 358: int fd;
1.120 nicm 359:
1.66 nicm 360: switch (sig) {
361: case SIGTERM:
1.141 nicm 362: server_exit = 1;
363: server_send_exit();
1.66 nicm 364: break;
365: case SIGCHLD:
366: server_child_signal();
367: break;
368: case SIGUSR1:
369: event_del(&server_ev_accept);
1.119 nicm 370: fd = server_create_socket();
371: if (fd != -1) {
372: close(server_fd);
373: server_fd = fd;
374: server_update_socket();
375: }
1.104 nicm 376: server_add_accept(0);
1.66 nicm 377: break;
1.1 nicm 378: }
379: }
380:
381: /* Handle SIGCHLD. */
382: void
383: server_child_signal(void)
384: {
1.66 nicm 385: int status;
386: pid_t pid;
1.1 nicm 387:
388: for (;;) {
389: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
390: case -1:
391: if (errno == ECHILD)
392: return;
1.39 nicm 393: fatal("waitpid failed");
1.1 nicm 394: case 0:
395: return;
396: }
1.66 nicm 397: if (WIFSTOPPED(status))
398: server_child_stopped(pid, status);
1.79 nicm 399: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 400: server_child_exited(pid, status);
401: }
402: }
403:
404: /* Handle exited children. */
405: void
406: server_child_exited(pid_t pid, int status)
407: {
1.121 nicm 408: struct window *w, *w1;
1.66 nicm 409: struct window_pane *wp;
410: struct job *job;
411:
1.121 nicm 412: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 413: TAILQ_FOREACH(wp, &w->panes, entry) {
414: if (wp->pid == pid) {
1.118 nicm 415: wp->status = status;
1.77 nicm 416: server_destroy_pane(wp);
417: break;
1.53 nicm 418: }
419: }
1.80 nicm 420: }
1.1 nicm 421:
1.101 nicm 422: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 423: if (pid == job->pid) {
1.67 nicm 424: job_died(job, status); /* might free job */
425: break;
1.1 nicm 426: }
1.53 nicm 427: }
428: }
429:
1.66 nicm 430: /* Handle stopped children. */
1.31 nicm 431: void
1.66 nicm 432: server_child_stopped(pid_t pid, int status)
1.31 nicm 433: {
1.66 nicm 434: struct window *w;
435: struct window_pane *wp;
1.31 nicm 436:
1.66 nicm 437: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
438: return;
1.31 nicm 439:
1.121 nicm 440: RB_FOREACH(w, windows, &windows) {
1.66 nicm 441: TAILQ_FOREACH(wp, &w->panes, entry) {
442: if (wp->pid == pid) {
443: if (killpg(pid, SIGCONT) != 0)
444: kill(pid, SIGCONT);
445: }
1.1 nicm 446: }
447: }
448: }
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