Annotation of src/usr.bin/tmux/server.c, Revision 1.183
1.183 ! nicm 1: /* $OpenBSD: server.c,v 1.182 2018/08/18 20:08:52 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_loop(void);
54: static void server_send_exit(void);
55: static void server_accept(int, short, void *);
56: static void server_signal(int);
57: static void server_child_signal(void);
58: static void server_child_exited(pid_t, int);
59: static void server_child_stopped(pid_t, int);
1.126 nicm 60:
61: /* Set marked pane. */
62: void
63: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
64: {
1.169 nicm 65: cmd_find_clear_state(&marked_pane, 0);
1.155 nicm 66: marked_pane.s = s;
67: marked_pane.wl = wl;
68: marked_pane.w = wl->window;
69: marked_pane.wp = wp;
1.126 nicm 70: }
71:
72: /* Clear marked pane. */
73: void
74: server_clear_marked(void)
75: {
1.169 nicm 76: cmd_find_clear_state(&marked_pane, 0);
1.126 nicm 77: }
78:
79: /* Is this the marked pane? */
80: int
81: server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
82: {
83: if (s == NULL || wl == NULL || wp == NULL)
84: return (0);
1.155 nicm 85: if (marked_pane.s != s || marked_pane.wl != wl)
1.126 nicm 86: return (0);
1.155 nicm 87: if (marked_pane.wp != wp)
1.126 nicm 88: return (0);
89: return (server_check_marked());
90: }
91:
92: /* Check if the marked pane is still valid. */
93: int
94: server_check_marked(void)
95: {
1.155 nicm 96: return (cmd_find_valid_state(&marked_pane));
1.126 nicm 97: }
1.45 nicm 98:
1.60 nicm 99: /* Create server socket. */
1.160 nicm 100: static int
1.178 nicm 101: server_create_socket(char **cause)
1.1 nicm 102: {
1.60 nicm 103: struct sockaddr_un sa;
104: size_t size;
105: mode_t mask;
1.178 nicm 106: int fd, saved_errno;
1.60 nicm 107:
108: memset(&sa, 0, sizeof sa);
109: sa.sun_family = AF_UNIX;
110: size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
111: if (size >= sizeof sa.sun_path) {
112: errno = ENAMETOOLONG;
1.178 nicm 113: goto fail;
1.60 nicm 114: }
115: unlink(sa.sun_path);
116:
117: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.178 nicm 118: goto fail;
1.60 nicm 119:
1.89 nicm 120: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
1.178 nicm 121: if (bind(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
122: saved_errno = errno;
1.170 nicm 123: close(fd);
1.178 nicm 124: errno = saved_errno;
125: goto fail;
1.170 nicm 126: }
1.60 nicm 127: umask(mask);
128:
1.170 nicm 129: if (listen(fd, 128) == -1) {
1.178 nicm 130: saved_errno = errno;
1.170 nicm 131: close(fd);
1.178 nicm 132: errno = saved_errno;
133: goto fail;
1.170 nicm 134: }
1.100 nicm 135: setblocking(fd, 0);
1.1 nicm 136:
1.60 nicm 137: return (fd);
1.178 nicm 138:
139: fail:
140: if (cause != NULL) {
141: xasprintf(cause, "error creating %s (%s)", socket_path,
142: strerror(errno));
143: }
144: return (-1);
145: }
146:
147: /* Server error callback. */
148: static enum cmd_retval
149: server_start_error(struct cmdq_item *item, void *data)
150: {
151: char *error = data;
152:
153: cmdq_error(item, "%s", error);
154: free(error);
155:
156: return (CMD_RETURN_NORMAL);
1.60 nicm 157: }
158:
1.1 nicm 159: /* Fork new server. */
160: int
1.174 nicm 161: server_start(struct tmuxproc *client, struct event_base *base, int lockfd,
162: char *lockfile)
1.1 nicm 163: {
1.167 nicm 164: int pair[2];
1.175 nicm 165: sigset_t set, oldset;
1.178 nicm 166: struct client *c;
167: char *cause = NULL;
1.1 nicm 168:
169: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
170: fatal("socketpair failed");
171:
1.175 nicm 172: sigfillset(&set);
173: sigprocmask(SIG_BLOCK, &set, &oldset);
1.174 nicm 174: switch (fork()) {
175: case -1:
176: fatal("fork failed");
177: case 0:
178: break;
179: default:
1.175 nicm 180: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.1 nicm 181: close(pair[1]);
182: return (pair[0]);
183: }
184: close(pair[0]);
1.174 nicm 185: if (daemon(1, 0) != 0)
186: fatal("daemon failed");
1.176 nicm 187: proc_clear_signals(client, 0);
1.174 nicm 188: if (event_reinit(base) != 0)
189: fatalx("event_reinit failed");
190: server_proc = proc_start("server");
191: proc_set_signals(server_proc, server_signal);
1.175 nicm 192: sigprocmask(SIG_SETMASK, &oldset, NULL);
1.143 nicm 193:
1.171 nicm 194: if (log_get_level() > 1)
1.146 nicm 195: tty_create_log();
1.151 nicm 196: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
197: "tty ps", NULL) != 0)
1.143 nicm 198: fatal("pledge failed");
1.1 nicm 199:
1.121 nicm 200: RB_INIT(&windows);
1.102 nicm 201: RB_INIT(&all_window_panes);
1.122 nicm 202: TAILQ_INIT(&clients);
1.97 nicm 203: RB_INIT(&sessions);
1.1 nicm 204: key_bindings_init();
205:
1.153 nicm 206: gettimeofday(&start_time, NULL);
1.16 nicm 207:
1.178 nicm 208: server_fd = server_create_socket(&cause);
209: if (server_fd != -1)
210: server_update_socket();
211: c = server_client_create(pair[1]);
1.103 nicm 212:
1.154 nicm 213: if (lockfd >= 0) {
214: unlink(lockfile);
215: free(lockfile);
216: close(lockfd);
217: }
1.16 nicm 218:
1.178 nicm 219: if (cause != NULL) {
220: cmdq_append(c, cmdq_get_callback(server_start_error, cause));
221: c->flags |= CLIENT_EXIT;
222: }
223:
1.139 nicm 224: start_cfg();
1.104 nicm 225: server_add_accept(0);
1.66 nicm 226:
1.144 nicm 227: proc_loop(server_proc, server_loop);
1.167 nicm 228:
1.183 ! nicm 229: job_kill_all();
! 230: status_prompt_save_history();
1.167 nicm 231:
1.66 nicm 232: exit(0);
1.1 nicm 233: }
234:
1.144 nicm 235: /* Server loop callback. */
1.160 nicm 236: static int
1.66 nicm 237: server_loop(void)
1.1 nicm 238: {
1.144 nicm 239: struct client *c;
1.162 nicm 240: u_int items;
241:
242: do {
243: items = cmdq_next(NULL);
1.164 nicm 244: TAILQ_FOREACH(c, &clients, entry) {
245: if (c->flags & CLIENT_IDENTIFIED)
246: items += cmdq_next(c);
247: }
1.162 nicm 248: } while (items != 0);
1.31 nicm 249:
1.144 nicm 250: server_client_loop();
1.179 nicm 251:
252: if (!options_get_number(global_options, "exit-empty") && !server_exit)
253: return (0);
1.1 nicm 254:
1.145 nicm 255: if (!options_get_number(global_options, "exit-unattached")) {
1.97 nicm 256: if (!RB_EMPTY(&sessions))
257: return (0);
1.1 nicm 258: }
1.116 nicm 259:
1.122 nicm 260: TAILQ_FOREACH(c, &clients, entry) {
261: if (c->session != NULL)
1.116 nicm 262: return (0);
263: }
264:
265: /*
266: * No attached clients therefore want to exit - flush any waiting
267: * clients but don't actually exit until they've gone.
268: */
269: cmd_wait_for_flush();
1.122 nicm 270: if (!TAILQ_EMPTY(&clients))
271: return (0);
1.116 nicm 272:
1.183 ! nicm 273: if (job_still_running())
! 274: return (0);
1.180 nicm 275:
1.66 nicm 276: return (1);
1.1 nicm 277: }
278:
1.141 nicm 279: /* Exit the server by killing all clients and windows. */
1.160 nicm 280: static void
1.141 nicm 281: server_send_exit(void)
1.1 nicm 282: {
1.122 nicm 283: struct client *c, *c1;
284: struct session *s, *s1;
1.116 nicm 285:
286: cmd_wait_for_flush();
1.1 nicm 287:
1.122 nicm 288: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
1.144 nicm 289: if (c->flags & CLIENT_SUSPENDED)
1.122 nicm 290: server_client_lost(c);
1.180 nicm 291: else {
292: if (c->flags & CLIENT_ATTACHED)
293: notify_client("client-detached", c);
1.144 nicm 294: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
1.180 nicm 295: }
1.122 nicm 296: c->session = NULL;
1.42 nicm 297: }
298:
1.122 nicm 299: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
1.173 nicm 300: session_destroy(s, __func__);
1.66 nicm 301: }
302:
303: /* Update socket execute permissions based on whether sessions are attached. */
1.75 nicm 304: void
1.66 nicm 305: server_update_socket(void)
1.42 nicm 306: {
1.66 nicm 307: struct session *s;
308: static int last = -1;
1.93 nicm 309: int n, mode;
310: struct stat sb;
1.1 nicm 311:
1.66 nicm 312: n = 0;
1.97 nicm 313: RB_FOREACH(s, sessions, &sessions) {
1.182 nicm 314: if (s->attached != 0) {
1.66 nicm 315: n++;
316: break;
317: }
318: }
319:
320: if (n != last) {
321: last = n;
1.93 nicm 322:
323: if (stat(socket_path, &sb) != 0)
324: return;
1.159 semarie 325: mode = sb.st_mode & ACCESSPERMS;
1.93 nicm 326: if (n != 0) {
327: if (mode & S_IRUSR)
328: mode |= S_IXUSR;
329: if (mode & S_IRGRP)
330: mode |= S_IXGRP;
331: if (mode & S_IROTH)
332: mode |= S_IXOTH;
333: } else
334: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
335: chmod(socket_path, mode);
1.66 nicm 336: }
337: }
338:
339: /* Callback for server socket. */
1.160 nicm 340: static void
1.150 nicm 341: server_accept(int fd, short events, __unused void *data)
1.66 nicm 342: {
343: struct sockaddr_storage sa;
344: socklen_t slen = sizeof sa;
345: int newfd;
346:
1.104 nicm 347: server_add_accept(0);
1.66 nicm 348: if (!(events & EV_READ))
349: return;
350:
351: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
352: if (newfd == -1) {
353: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
354: return;
1.104 nicm 355: if (errno == ENFILE || errno == EMFILE) {
356: /* Delete and don't try again for 1 second. */
357: server_add_accept(1);
358: return;
359: }
1.66 nicm 360: fatal("accept failed");
361: }
1.141 nicm 362: if (server_exit) {
1.66 nicm 363: close(newfd);
364: return;
1.42 nicm 365: }
1.66 nicm 366: server_client_create(newfd);
367: }
368:
1.104 nicm 369: /*
370: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
371: * event - used to backoff when running out of file descriptors.
372: */
373: void
374: server_add_accept(int timeout)
375: {
376: struct timeval tv = { timeout, 0 };
377:
378: if (event_initialized(&server_ev_accept))
379: event_del(&server_ev_accept);
380:
381: if (timeout == 0) {
1.144 nicm 382: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
383: NULL);
1.104 nicm 384: event_add(&server_ev_accept, NULL);
385: } else {
1.144 nicm 386: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
387: server_accept, NULL);
1.104 nicm 388: event_add(&server_ev_accept, &tv);
389: }
390: }
391:
1.66 nicm 392: /* Signal handler. */
1.160 nicm 393: static void
1.144 nicm 394: server_signal(int sig)
1.66 nicm 395: {
1.119 nicm 396: int fd;
1.120 nicm 397:
1.173 nicm 398: log_debug("%s: %s", __func__, strsignal(sig));
1.66 nicm 399: switch (sig) {
400: case SIGTERM:
1.141 nicm 401: server_exit = 1;
402: server_send_exit();
1.66 nicm 403: break;
404: case SIGCHLD:
405: server_child_signal();
406: break;
407: case SIGUSR1:
408: event_del(&server_ev_accept);
1.178 nicm 409: fd = server_create_socket(NULL);
1.119 nicm 410: if (fd != -1) {
411: close(server_fd);
412: server_fd = fd;
413: server_update_socket();
414: }
1.104 nicm 415: server_add_accept(0);
1.171 nicm 416: break;
417: case SIGUSR2:
418: proc_toggle_log(server_proc);
1.66 nicm 419: break;
1.1 nicm 420: }
421: }
422:
423: /* Handle SIGCHLD. */
1.160 nicm 424: static void
1.1 nicm 425: server_child_signal(void)
426: {
1.66 nicm 427: int status;
428: pid_t pid;
1.1 nicm 429:
430: for (;;) {
431: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
432: case -1:
433: if (errno == ECHILD)
434: return;
1.39 nicm 435: fatal("waitpid failed");
1.1 nicm 436: case 0:
437: return;
438: }
1.66 nicm 439: if (WIFSTOPPED(status))
440: server_child_stopped(pid, status);
1.79 nicm 441: else if (WIFEXITED(status) || WIFSIGNALED(status))
1.66 nicm 442: server_child_exited(pid, status);
443: }
444: }
445:
446: /* Handle exited children. */
1.160 nicm 447: static void
1.66 nicm 448: server_child_exited(pid_t pid, int status)
449: {
1.121 nicm 450: struct window *w, *w1;
1.66 nicm 451: struct window_pane *wp;
452:
1.121 nicm 453: RB_FOREACH_SAFE(w, windows, &windows, w1) {
1.66 nicm 454: TAILQ_FOREACH(wp, &w->panes, entry) {
455: if (wp->pid == pid) {
1.118 nicm 456: wp->status = status;
1.177 nicm 457: wp->flags |= PANE_STATUSREADY;
1.172 nicm 458:
459: log_debug("%%%u exited", wp->id);
460: wp->flags |= PANE_EXITED;
461:
462: if (window_pane_destroy_ready(wp))
463: server_destroy_pane(wp, 1);
1.77 nicm 464: break;
1.53 nicm 465: }
466: }
1.80 nicm 467: }
1.183 ! nicm 468: job_check_died(pid, status);
1.53 nicm 469: }
470:
1.66 nicm 471: /* Handle stopped children. */
1.160 nicm 472: static void
1.66 nicm 473: server_child_stopped(pid_t pid, int status)
1.31 nicm 474: {
1.66 nicm 475: struct window *w;
476: struct window_pane *wp;
1.31 nicm 477:
1.66 nicm 478: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
479: return;
1.31 nicm 480:
1.121 nicm 481: RB_FOREACH(w, windows, &windows) {
1.66 nicm 482: TAILQ_FOREACH(wp, &w->panes, entry) {
483: if (wp->pid == pid) {
484: if (killpg(pid, SIGCONT) != 0)
485: kill(pid, SIGCONT);
486: }
1.1 nicm 487: }
488: }
489: }
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