Annotation of src/usr.bin/tmux/server.c, Revision 1.172
1.172 ! nicm 1: /* $OpenBSD: server.c,v 1.171 2017/06/04 08:25:57 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: {
1.169 nicm 66: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 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: {
1.169 nicm 77: cmd_find_clear_state(&marked_pane, 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);
1.170 nicm 122: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
123: close(fd);
1.119 nicm 124: return (-1);
1.170 nicm 125: }
1.60 nicm 126: umask(mask);
127:
1.170 nicm 128: if (listen(fd, 128) == -1) {
129: close(fd);
1.119 nicm 130: return (-1);
1.170 nicm 131: }
1.100 nicm 132: setblocking(fd, 0);
1.1 nicm 133:
1.60 nicm 134: return (fd);
135: }
136:
1.1 nicm 137: /* Fork new server. */
138: int
1.138 nicm 139: server_start(struct event_base *base, int lockfd, char *lockfile)
1.1 nicm 140: {
1.167 nicm 141: int pair[2];
142: struct job *job;
1.1 nicm 143:
144: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
145: fatal("socketpair failed");
146:
1.144 nicm 147: server_proc = proc_start("server", base, 1, server_signal);
148: if (server_proc == NULL) {
1.1 nicm 149: close(pair[1]);
150: return (pair[0]);
151: }
152: close(pair[0]);
1.143 nicm 153:
1.171 nicm 154: if (log_get_level() > 1)
1.146 nicm 155: tty_create_log();
1.151 nicm 156: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
157: "tty ps", NULL) != 0)
1.143 nicm 158: fatal("pledge failed");
1.1 nicm 159:
1.121 nicm 160: RB_INIT(&windows);
1.102 nicm 161: RB_INIT(&all_window_panes);
1.122 nicm 162: TAILQ_INIT(&clients);
1.97 nicm 163: RB_INIT(&sessions);
1.166 nicm 164: RB_INIT(&session_groups);
1.1 nicm 165: key_bindings_init();
166:
1.153 nicm 167: gettimeofday(&start_time, NULL);
1.16 nicm 168:
1.66 nicm 169: server_fd = server_create_socket();
1.119 nicm 170: if (server_fd == -1)
171: fatal("couldn't create socket");
172: server_update_socket();
1.60 nicm 173: server_client_create(pair[1]);
1.103 nicm 174:
1.154 nicm 175: if (lockfd >= 0) {
176: unlink(lockfile);
177: free(lockfile);
178: close(lockfd);
179: }
1.16 nicm 180:
1.139 nicm 181: start_cfg();
1.66 nicm 182:
1.104 nicm 183: server_add_accept(0);
1.66 nicm 184:
1.144 nicm 185: proc_loop(server_proc, server_loop);
1.167 nicm 186:
187: LIST_FOREACH(job, &all_jobs, entry) {
188: if (job->pid != -1)
189: kill(job->pid, SIGTERM);
190: }
191:
1.129 nicm 192: status_prompt_save_history();
1.66 nicm 193: exit(0);
1.1 nicm 194: }
195:
1.144 nicm 196: /* Server loop callback. */
1.160 nicm 197: static int
1.66 nicm 198: server_loop(void)
1.1 nicm 199: {
1.144 nicm 200: struct client *c;
1.162 nicm 201: u_int items;
202:
203: do {
204: items = cmdq_next(NULL);
1.164 nicm 205: TAILQ_FOREACH(c, &clients, entry) {
206: if (c->flags & CLIENT_IDENTIFIED)
207: items += cmdq_next(c);
208: }
1.162 nicm 209: } while (items != 0);
1.31 nicm 210:
1.144 nicm 211: server_client_loop();
1.1 nicm 212:
1.145 nicm 213: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 214: if (!RB_EMPTY(&sessions))
215: return (0);
1.1 nicm 216: }
1.116 nicm 217:
1.122 nicm 218: TAILQ_FOREACH(c, &clients, entry) {
219: if (c->session != NULL)
1.116 nicm 220: return (0);
221: }
222:
223: /*
224: * No attached clients therefore want to exit - flush any waiting
225: * clients but don't actually exit until they've gone.
226: */
227: cmd_wait_for_flush();
1.122 nicm 228: if (!TAILQ_EMPTY(&clients))
229: return (0);
1.116 nicm 230:
1.66 nicm 231: return (1);
1.1 nicm 232: }
233:
1.141 nicm 234: /* Exit the server by killing all clients and windows. */
1.160 nicm 235: static void
1.141 nicm 236: server_send_exit(void)
1.1 nicm 237: {
1.122 nicm 238: struct client *c, *c1;
239: struct session *s, *s1;
1.116 nicm 240:
241: cmd_wait_for_flush();
1.1 nicm 242:
1.122 nicm 243: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 244: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 245: server_client_lost(c);
246: else
1.144 nicm 247: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.122 nicm 248: c->session = NULL;
1.42 nicm 249: }
250:
1.122 nicm 251: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.97 nicm 252: session_destroy(s);
1.66 nicm 253: }
254:
255: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 256: void
1.66 nicm 257: server_update_socket(void)
1.42 nicm 258: {
1.66 nicm 259: struct session *s;
260: static int last = -1;
1.93 nicm 261: int n, mode;
262: struct stat sb;
1.1 nicm 263:
1.66 nicm 264: n = 0;
1.97 nicm 265: RB_FOREACH(s, sessions, &sessions) {
266: if (!(s->flags & SESSION_UNATTACHED)) {
1.66 nicm 267: n++;
268: break;
269: }
270: }
271:
272: if (n != last) {
273: last = n;
1.93 nicm 274:
275: if (stat(socket_path, &sb) != 0)
276: return;
1.159 semarie 277: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 278: if (n != 0) {
279: if (mode & S_IRUSR)
280: mode |= S_IXUSR;
281: if (mode & S_IRGRP)
282: mode |= S_IXGRP;
283: if (mode & S_IROTH)
284: mode |= S_IXOTH;
285: } else
286: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
287: chmod(socket_path, mode);
1.66 nicm 288: }
289: }
290:
291: /* Callback for server socket. */
1.160 nicm 292: static void
1.150 nicm 293: server_accept(int fd, short events, __unused void *data)
1.66 nicm 294: {
295: struct sockaddr_storage sa;
296: socklen_t slen = sizeof sa;
297: int newfd;
298:
1.104 nicm 299: server_add_accept(0);
1.66 nicm 300: if (!(events & EV_READ))
301: return;
302:
303: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
304: if (newfd == -1) {
305: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
306: return;
1.104 nicm 307: if (errno == ENFILE || errno == EMFILE) {
308: /* Delete and don't try again for 1 second. */
309: server_add_accept(1);
310: return;
311: }
1.66 nicm 312: fatal("accept failed");
313: }
1.141 nicm 314: if (server_exit) {
1.66 nicm 315: close(newfd);
316: return;
1.42 nicm 317: }
1.66 nicm 318: server_client_create(newfd);
319: }
320:
1.104 nicm 321: /*
322: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
323: * event - used to backoff when running out of file descriptors.
324: */
325: void
326: server_add_accept(int timeout)
327: {
328: struct timeval tv = { timeout, 0 };
329:
330: if (event_initialized(&server_ev_accept))
331: event_del(&server_ev_accept);
332:
333: if (timeout == 0) {
1.144 nicm 334: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
335: NULL);
1.104 nicm 336: event_add(&server_ev_accept, NULL);
337: } else {
1.144 nicm 338: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
339: server_accept, NULL);
1.104 nicm 340: event_add(&server_ev_accept, &tv);
341: }
342: }
343:
1.66 nicm 344: /* Signal handler. */
1.160 nicm 345: static void
1.144 nicm 346: server_signal(int sig)
1.66 nicm 347: {
1.119 nicm 348: int fd;
1.120 nicm 349:
1.66 nicm 350: switch (sig) {
351: case SIGTERM:
1.141 nicm 352: server_exit = 1;
353: server_send_exit();
1.66 nicm 354: break;
355: case SIGCHLD:
356: server_child_signal();
357: break;
358: case SIGUSR1:
359: event_del(&server_ev_accept);
1.119 nicm 360: fd = server_create_socket();
361: if (fd != -1) {
362: close(server_fd);
363: server_fd = fd;
364: server_update_socket();
365: }
1.104 nicm 366: server_add_accept(0);
1.171 nicm 367: break;
368: case SIGUSR2:
369: proc_toggle_log(server_proc);
1.66 nicm 370: break;
1.1 nicm 371: }
372: }
373:
374: /* Handle SIGCHLD. */
1.160 nicm 375: static void
1.1 nicm 376: server_child_signal(void)
377: {
1.66 nicm 378: int status;
379: pid_t pid;
1.1 nicm 380:
381: for (;;) {
382: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
383: case -1:
384: if (errno == ECHILD)
385: return;
1.39 nicm 386: fatal("waitpid failed");
1.1 nicm 387: case 0:
388: return;
389: }
1.66 nicm 390: if (WIFSTOPPED(status))
391: server_child_stopped(pid, status);
1.79 nicm 392: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 393: server_child_exited(pid, status);
394: }
395: }
396:
397: /* Handle exited children. */
1.160 nicm 398: static void
1.66 nicm 399: server_child_exited(pid_t pid, int status)
400: {
1.121 nicm 401: struct window *w, *w1;
1.66 nicm 402: struct window_pane *wp;
403: struct job *job;
404:
1.121 nicm 405: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 406: TAILQ_FOREACH(wp, &w->panes, entry) {
407: if (wp->pid == pid) {
1.118 nicm 408: wp->status = status;
1.172 ! nicm 409:
! 410: log_debug("%%%u exited", wp->id);
! 411: wp->flags |= PANE_EXITED;
! 412:
! 413: if (window_pane_destroy_ready(wp))
! 414: server_destroy_pane(wp, 1);
1.77 nicm 415: break;
1.53 nicm 416: }
417: }
1.80 nicm 418: }
1.1 nicm 419:
1.167 nicm 420: LIST_FOREACH(job, &all_jobs, entry) {
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. */
1.160 nicm 429: static 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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