Annotation of src/usr.bin/tmux/server.c, Revision 1.166
1.166 ! nicm 1: /* $OpenBSD: server.c,v 1.165 2017/01/24 21:50:22 nicm Exp $ */
1.1 nicm 2:
3: /*
1.157 nicm 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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:
1.155 nicm 44: struct clients clients;
1.1 nicm 45:
1.155 nicm 46: struct tmuxproc *server_proc;
1.160 nicm 47: static int server_fd;
48: static int server_exit;
49: static struct event server_ev_accept;
1.155 nicm 50:
51: struct cmd_find_state marked_pane;
1.126 nicm 52:
1.160 nicm 53: static int server_create_socket(void);
54: static int server_loop(void);
55: static void server_send_exit(void);
56: static void server_accept(int, short, void *);
57: static void server_signal(int);
58: static void server_child_signal(void);
59: static void server_child_exited(pid_t, int);
60: static void server_child_stopped(pid_t, int);
1.126 nicm 61:
62: /* Set marked pane. */
63: void
64: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
65: {
1.155 nicm 66: cmd_find_clear_state(&marked_pane, NULL, 0);
67: marked_pane.s = s;
68: marked_pane.wl = wl;
69: marked_pane.w = wl->window;
70: marked_pane.wp = wp;
1.126 nicm 71: }
72:
73: /* Clear marked pane. */
74: void
75: server_clear_marked(void)
76: {
1.155 nicm 77: cmd_find_clear_state(&marked_pane, NULL, 0);
1.126 nicm 78: }
79:
80: /* Is this the marked pane? */
81: int
82: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
83: {
84: if (s == NULL || wl == NULL || wp == NULL)
85: return (0);
1.155 nicm 86: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 87: return (0);
1.155 nicm 88: if (marked_pane.wp != wp)
1.126 nicm 89: return (0);
90: return (server_check_marked());
91: }
92:
93: /* Check if the marked pane is still valid. */
94: int
95: server_check_marked(void)
96: {
1.155 nicm 97: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 98: }
1.45 nicm 99:
1.60 nicm 100: /* Create server socket. */
1.160 nicm 101: static int
1.60 nicm 102: server_create_socket(void)
1.1 nicm 103: {
1.60 nicm 104: struct sockaddr_un sa;
105: size_t size;
106: mode_t mask;
1.100 nicm 107: int fd;
1.60 nicm 108:
109: memset(&sa, 0, sizeof sa);
110: sa.sun_family = AF_UNIX;
111: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
112: if (size >= sizeof sa.sun_path) {
113: errno = ENAMETOOLONG;
1.119 nicm 114: return (-1);
1.60 nicm 115: }
116: unlink(sa.sun_path);
117:
118: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.119 nicm 119: return (-1);
1.60 nicm 120:
1.89 nicm 121: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.140 guenther 122: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1)
1.119 nicm 123: return (-1);
1.60 nicm 124: umask(mask);
125:
1.158 nicm 126: if (listen(fd, 128) == -1)
1.119 nicm 127: return (-1);
1.100 nicm 128: setblocking(fd, 0);
1.1 nicm 129:
1.60 nicm 130: return (fd);
131: }
132:
1.1 nicm 133: /* Fork new server. */
134: int
1.138 nicm 135: server_start(struct event_base *base, int lockfd, char *lockfile)
1.1 nicm 136: {
1.139 nicm 137: int pair[2];
1.1 nicm 138:
139: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
140: fatal("socketpair failed");
141:
1.144 nicm 142: server_proc = proc_start("server", base, 1, server_signal);
143: if (server_proc == NULL) {
1.1 nicm 144: close(pair[1]);
145: return (pair[0]);
146: }
147: close(pair[0]);
1.143 nicm 148:
1.152 nicm 149: if (log_get_level() > 3)
1.146 nicm 150: tty_create_log();
1.151 nicm 151: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
152: "tty ps", NULL) != 0)
1.143 nicm 153: fatal("pledge failed");
1.1 nicm 154:
1.121 nicm 155: RB_INIT(&windows);
1.102 nicm 156: RB_INIT(&all_window_panes);
1.122 nicm 157: TAILQ_INIT(&clients);
1.97 nicm 158: RB_INIT(&sessions);
1.166 ! nicm 159: RB_INIT(&session_groups);
1.1 nicm 160: key_bindings_init();
161:
1.153 nicm 162: gettimeofday(&start_time, NULL);
1.16 nicm 163:
1.66 nicm 164: server_fd = server_create_socket();
1.119 nicm 165: if (server_fd == -1)
166: fatal("couldn't create socket");
167: server_update_socket();
1.60 nicm 168: server_client_create(pair[1]);
1.103 nicm 169:
1.154 nicm 170: if (lockfd >= 0) {
171: unlink(lockfile);
172: free(lockfile);
173: close(lockfd);
174: }
1.16 nicm 175:
1.139 nicm 176: start_cfg();
177:
1.129 nicm 178: status_prompt_load_history();
1.66 nicm 179:
1.104 nicm 180: server_add_accept(0);
1.66 nicm 181:
1.144 nicm 182: proc_loop(server_proc, server_loop);
1.129 nicm 183: status_prompt_save_history();
1.66 nicm 184: exit(0);
1.1 nicm 185: }
186:
1.144 nicm 187: /* Server loop callback. */
1.160 nicm 188: static int
1.66 nicm 189: server_loop(void)
1.1 nicm 190: {
1.144 nicm 191: struct client *c;
1.162 nicm 192: u_int items;
193:
194: do {
195: items = cmdq_next(NULL);
1.164 nicm 196: TAILQ_FOREACH(c, &clients, entry) {
197: if (c->flags & CLIENT_IDENTIFIED)
198: items += cmdq_next(c);
199: }
1.162 nicm 200: } while (items != 0);
1.31 nicm 201:
1.144 nicm 202: server_client_loop();
1.1 nicm 203:
1.145 nicm 204: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 205: if (!RB_EMPTY(&sessions))
206: return (0);
1.1 nicm 207: }
1.116 nicm 208:
1.122 nicm 209: TAILQ_FOREACH(c, &clients, entry) {
210: if (c->session != NULL)
1.116 nicm 211: return (0);
212: }
213:
214: /*
215: * No attached clients therefore want to exit - flush any waiting
216: * clients but don't actually exit until they've gone.
217: */
218: cmd_wait_for_flush();
1.122 nicm 219: if (!TAILQ_EMPTY(&clients))
220: return (0);
1.116 nicm 221:
1.66 nicm 222: return (1);
1.1 nicm 223: }
224:
1.141 nicm 225: /* Exit the server by killing all clients and windows. */
1.160 nicm 226: static void
1.141 nicm 227: server_send_exit(void)
1.1 nicm 228: {
1.122 nicm 229: struct client *c, *c1;
230: struct session *s, *s1;
1.116 nicm 231:
232: cmd_wait_for_flush();
1.1 nicm 233:
1.122 nicm 234: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 235: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 236: server_client_lost(c);
237: else
1.144 nicm 238: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 239: c->session = NULL;
1.42 nicm 240: }
241:
1.122 nicm 242: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 243: session_destroy(s);
1.66 nicm 244: }
245:
246: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 247: void
1.66 nicm 248: server_update_socket(void)
1.42 nicm 249: {
1.66 nicm 250: struct session *s;
251: static int last = -1;
1.93 nicm 252: int n, mode;
253: struct stat sb;
1.1 nicm 254:
1.66 nicm 255: n = 0;
1.97 nicm 256: RB_FOREACH(s, sessions, &sessions) {
257: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 258: n++;
259: break;
260: }
261: }
262:
263: if (n != last) {
264: last = n;
1.93 nicm 265:
266: if (stat(socket_path, &sb) != 0)
267: return;
1.159 semarie 268: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 269: if (n != 0) {
270: if (mode & S_IRUSR)
271: mode |= S_IXUSR;
272: if (mode & S_IRGRP)
273: mode |= S_IXGRP;
274: if (mode & S_IROTH)
275: mode |= S_IXOTH;
276: } else
277: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
278: chmod(socket_path, mode);
1.66 nicm 279: }
280: }
281:
282: /* Callback for server socket. */
1.160 nicm 283: static void
1.150 nicm 284: server_accept(int fd, short events, __unused void *data)
1.66 nicm 285: {
286: struct sockaddr_storage sa;
287: socklen_t slen = sizeof sa;
288: int newfd;
289:
1.104 nicm 290: server_add_accept(0);
1.66 nicm 291: if (!(events & EV_READ))
292: return;
293:
294: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
295: if (newfd == -1) {
296: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
297: return;
1.104 nicm 298: if (errno == ENFILE || errno == EMFILE) {
299: /* Delete and don't try again for 1 second. */
300: server_add_accept(1);
301: return;
302: }
1.66 nicm 303: fatal("accept failed");
304: }
1.141 nicm 305: if (server_exit) {
1.66 nicm 306: close(newfd);
307: return;
1.42 nicm 308: }
1.66 nicm 309: server_client_create(newfd);
310: }
311:
1.104 nicm 312: /*
313: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
314: * event - used to backoff when running out of file descriptors.
315: */
316: void
317: server_add_accept(int timeout)
318: {
319: struct timeval tv = { timeout, 0 };
320:
321: if (event_initialized(&server_ev_accept))
322: event_del(&server_ev_accept);
323:
324: if (timeout == 0) {
1.144 nicm 325: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
326: NULL);
1.104 nicm 327: event_add(&server_ev_accept, NULL);
328: } else {
1.144 nicm 329: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
330: server_accept, NULL);
1.104 nicm 331: event_add(&server_ev_accept, &tv);
332: }
333: }
334:
1.66 nicm 335: /* Signal handler. */
1.160 nicm 336: static void
1.144 nicm 337: server_signal(int sig)
1.66 nicm 338: {
1.119 nicm 339: int fd;
1.120 nicm 340:
1.66 nicm 341: switch (sig) {
342: case SIGTERM:
1.141 nicm 343: server_exit = 1;
344: server_send_exit();
1.66 nicm 345: break;
346: case SIGCHLD:
347: server_child_signal();
348: break;
349: case SIGUSR1:
350: event_del(&server_ev_accept);
1.119 nicm 351: fd = server_create_socket();
352: if (fd != -1) {
353: close(server_fd);
354: server_fd = fd;
355: server_update_socket();
356: }
1.104 nicm 357: server_add_accept(0);
1.66 nicm 358: break;
1.1 nicm 359: }
360: }
361:
362: /* Handle SIGCHLD. */
1.160 nicm 363: static void
1.1 nicm 364: server_child_signal(void)
365: {
1.66 nicm 366: int status;
367: pid_t pid;
1.1 nicm 368:
369: for (;;) {
370: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
371: case -1:
372: if (errno == ECHILD)
373: return;
1.39 nicm 374: fatal("waitpid failed");
1.1 nicm 375: case 0:
376: return;
377: }
1.66 nicm 378: if (WIFSTOPPED(status))
379: server_child_stopped(pid, status);
1.79 nicm 380: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 381: server_child_exited(pid, status);
382: }
383: }
384:
385: /* Handle exited children. */
1.160 nicm 386: static void
1.66 nicm 387: server_child_exited(pid_t pid, int status)
388: {
1.121 nicm 389: struct window *w, *w1;
1.66 nicm 390: struct window_pane *wp;
391: struct job *job;
392:
1.121 nicm 393: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 394: TAILQ_FOREACH(wp, &w->panes, entry) {
395: if (wp->pid == pid) {
1.118 nicm 396: wp->status = status;
1.156 nicm 397: server_destroy_pane(wp, 1);
1.77 nicm 398: break;
1.53 nicm 399: }
400: }
1.80 nicm 401: }
1.1 nicm 402:
1.101 nicm 403: LIST_FOREACH(job, &all_jobs, lentry) {
1.66 nicm 404: if (pid == job->pid) {
1.67 nicm 405: job_died(job, status); /* might free job */
406: break;
1.1 nicm 407: }
1.53 nicm 408: }
409: }
410:
1.66 nicm 411: /* Handle stopped children. */
1.160 nicm 412: static void
1.66 nicm 413: server_child_stopped(pid_t pid, int status)
1.31 nicm 414: {
1.66 nicm 415: struct window *w;
416: struct window_pane *wp;
1.31 nicm 417:
1.66 nicm 418: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
419: return;
1.31 nicm 420:
1.121 nicm 421: RB_FOREACH(w, windows, &windows) {
1.66 nicm 422: TAILQ_FOREACH(wp, &w->panes, entry) {
423: if (wp->pid == pid) {
424: if (killpg(pid, SIGCONT) != 0)
425: kill(pid, SIGCONT);
426: }
1.1 nicm 427: }
428: }
429: }
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