Annotation of src/usr.bin/tmux/server.c, Revision 1.153
1.153 ! nicm 1: /* $OpenBSD: server.c,v 1.152 2015/11/24 21:19:46 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:
198: unlink(lockfile);
1.105 nicm 199: free(lockfile);
1.103 nicm 200: close(lockfd);
1.16 nicm 201:
1.139 nicm 202: start_cfg();
203:
1.129 nicm 204: status_prompt_load_history();
1.66 nicm 205:
1.104 nicm 206: server_add_accept(0);
1.66 nicm 207:
1.144 nicm 208: proc_loop(server_proc, server_loop);
1.129 nicm 209: status_prompt_save_history();
1.66 nicm 210: exit(0);
1.1 nicm 211: }
212:
1.144 nicm 213: /* Server loop callback. */
214: int
1.66 nicm 215: server_loop(void)
1.1 nicm 216: {
1.144 nicm 217: struct client *c;
1.31 nicm 218:
1.144 nicm 219: server_client_loop();
1.1 nicm 220:
1.145 nicm 221: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 222: if (!RB_EMPTY(&sessions))
223: return (0);
1.1 nicm 224: }
1.116 nicm 225:
1.122 nicm 226: TAILQ_FOREACH(c, &clients, entry) {
227: if (c->session != NULL)
1.116 nicm 228: return (0);
229: }
230:
231: /*
232: * No attached clients therefore want to exit - flush any waiting
233: * clients but don't actually exit until they've gone.
234: */
235: cmd_wait_for_flush();
1.122 nicm 236: if (!TAILQ_EMPTY(&clients))
237: return (0);
1.116 nicm 238:
1.66 nicm 239: return (1);
1.1 nicm 240: }
241:
1.141 nicm 242: /* Exit the server by killing all clients and windows. */
1.1 nicm 243: void
1.141 nicm 244: server_send_exit(void)
1.1 nicm 245: {
1.122 nicm 246: struct client *c, *c1;
247: struct session *s, *s1;
1.116 nicm 248:
249: cmd_wait_for_flush();
1.1 nicm 250:
1.122 nicm 251: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 252: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 253: server_client_lost(c);
254: else
1.144 nicm 255: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 256: c->session = NULL;
1.42 nicm 257: }
258:
1.122 nicm 259: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 260: session_destroy(s);
1.66 nicm 261: }
262:
263: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 264: void
1.66 nicm 265: server_update_socket(void)
1.42 nicm 266: {
1.66 nicm 267: struct session *s;
268: static int last = -1;
1.93 nicm 269: int n, mode;
270: struct stat sb;
1.1 nicm 271:
1.66 nicm 272: n = 0;
1.97 nicm 273: RB_FOREACH(s, sessions, &sessions) {
274: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 275: n++;
276: break;
277: }
278: }
279:
280: if (n != last) {
281: last = n;
1.93 nicm 282:
283: if (stat(socket_path, &sb) != 0)
284: return;
285: mode = sb.st_mode;
286: if (n != 0) {
287: if (mode & S_IRUSR)
288: mode |= S_IXUSR;
289: if (mode & S_IRGRP)
290: mode |= S_IXGRP;
291: if (mode & S_IROTH)
292: mode |= S_IXOTH;
293: } else
294: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
295: chmod(socket_path, mode);
1.66 nicm 296: }
297: }
298:
299: /* Callback for server socket. */
300: void
1.150 nicm 301: server_accept(int fd, short events, __unused void *data)
1.66 nicm 302: {
303: struct sockaddr_storage sa;
304: socklen_t slen = sizeof sa;
305: int newfd;
306:
1.104 nicm 307: server_add_accept(0);
1.66 nicm 308: if (!(events & EV_READ))
309: return;
310:
311: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
312: if (newfd == -1) {
313: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
314: return;
1.104 nicm 315: if (errno == ENFILE || errno == EMFILE) {
316: /* Delete and don't try again for 1 second. */
317: server_add_accept(1);
318: return;
319: }
1.66 nicm 320: fatal("accept failed");
321: }
1.141 nicm 322: if (server_exit) {
1.66 nicm 323: close(newfd);
324: return;
1.42 nicm 325: }
1.66 nicm 326: server_client_create(newfd);
327: }
328:
1.104 nicm 329: /*
330: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
331: * event - used to backoff when running out of file descriptors.
332: */
333: void
334: server_add_accept(int timeout)
335: {
336: struct timeval tv = { timeout, 0 };
337:
338: if (event_initialized(&server_ev_accept))
339: event_del(&server_ev_accept);
340:
341: if (timeout == 0) {
1.144 nicm 342: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
343: NULL);
1.104 nicm 344: event_add(&server_ev_accept, NULL);
345: } else {
1.144 nicm 346: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
347: server_accept, NULL);
1.104 nicm 348: event_add(&server_ev_accept, &tv);
349: }
350: }
351:
1.66 nicm 352: /* Signal handler. */
353: void
1.144 nicm 354: server_signal(int sig)
1.66 nicm 355: {
1.119 nicm 356: int fd;
1.120 nicm 357:
1.66 nicm 358: switch (sig) {
359: case SIGTERM:
1.141 nicm 360: server_exit = 1;
361: server_send_exit();
1.66 nicm 362: break;
363: case SIGCHLD:
364: server_child_signal();
365: break;
366: case SIGUSR1:
367: event_del(&server_ev_accept);
1.119 nicm 368: fd = server_create_socket();
369: if (fd != -1) {
370: close(server_fd);
371: server_fd = fd;
372: server_update_socket();
373: }
1.104 nicm 374: server_add_accept(0);
1.66 nicm 375: break;
1.1 nicm 376: }
377: }
378:
379: /* Handle SIGCHLD. */
380: void
381: server_child_signal(void)
382: {
1.66 nicm 383: int status;
384: pid_t pid;
1.1 nicm 385:
386: for (;;) {
387: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
388: case -1:
389: if (errno == ECHILD)
390: return;
1.39 nicm 391: fatal("waitpid failed");
1.1 nicm 392: case 0:
393: return;
394: }
1.66 nicm 395: if (WIFSTOPPED(status))
396: server_child_stopped(pid, status);
1.79 nicm 397: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 398: server_child_exited(pid, status);
399: }
400: }
401:
402: /* Handle exited children. */
403: void
404: server_child_exited(pid_t pid, int status)
405: {
1.121 nicm 406: struct window *w, *w1;
1.66 nicm 407: struct window_pane *wp;
408: struct job *job;
409:
1.121 nicm 410: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 411: TAILQ_FOREACH(wp, &w->panes, entry) {
412: if (wp->pid == pid) {
1.118 nicm 413: wp->status = status;
1.77 nicm 414: server_destroy_pane(wp);
415: break;
1.53 nicm 416: }
417: }
1.80 nicm 418: }
1.1 nicm 419:
1.101 nicm 420: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 421: if (pid == job->pid) {
1.67 nicm 422: job_died(job, status); /* might free job */
423: break;
1.1 nicm 424: }
1.53 nicm 425: }
426: }
427:
1.66 nicm 428: /* Handle stopped children. */
1.31 nicm 429: void
1.66 nicm 430: server_child_stopped(pid_t pid, int status)
1.31 nicm 431: {
1.66 nicm 432: struct window *w;
433: struct window_pane *wp;
1.31 nicm 434:
1.66 nicm 435: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
436: return;
1.31 nicm 437:
1.121 nicm 438: RB_FOREACH(w, windows, &windows) {
1.66 nicm 439: TAILQ_FOREACH(wp, &w->panes, entry) {
440: if (wp->pid == pid) {
441: if (killpg(pid, SIGCONT) != 0)
442: kill(pid, SIGCONT);
443: }
1.1 nicm 444: }
445: }
446: }
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