Annotation of embedaddon/tmux/server.c, revision 1.1
1.1 ! misho 1: /* $OpenBSD$ */
! 2:
! 3: /*
! 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
! 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>
! 27: #include <event.h>
! 28: #include <fcntl.h>
! 29: #include <signal.h>
! 30: #include <stdio.h>
! 31: #include <stdlib.h>
! 32: #include <string.h>
! 33: #include <termios.h>
! 34: #include <time.h>
! 35: #include <unistd.h>
! 36:
! 37: #include "tmux.h"
! 38:
! 39: /*
! 40: * Main server functions.
! 41: */
! 42:
! 43: struct clients clients;
! 44:
! 45: struct tmuxproc *server_proc;
! 46: static int server_fd;
! 47: static int server_exit;
! 48: static struct event server_ev_accept;
! 49:
! 50: struct cmd_find_state marked_pane;
! 51:
! 52: static int server_create_socket(void);
! 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);
! 60:
! 61: /* Set marked pane. */
! 62: void
! 63: server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
! 64: {
! 65: cmd_find_clear_state(&marked_pane, NULL, 0);
! 66: marked_pane.s = s;
! 67: marked_pane.wl = wl;
! 68: marked_pane.w = wl->window;
! 69: marked_pane.wp = wp;
! 70: }
! 71:
! 72: /* Clear marked pane. */
! 73: void
! 74: server_clear_marked(void)
! 75: {
! 76: cmd_find_clear_state(&marked_pane, NULL, 0);
! 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);
! 85: if (marked_pane.s != s || marked_pane.wl != wl)
! 86: return (0);
! 87: if (marked_pane.wp != wp)
! 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: {
! 96: return (cmd_find_valid_state(&marked_pane));
! 97: }
! 98:
! 99: /* Create server socket. */
! 100: static int
! 101: server_create_socket(void)
! 102: {
! 103: struct sockaddr_un sa;
! 104: size_t size;
! 105: mode_t mask;
! 106: int fd;
! 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;
! 113: return (-1);
! 114: }
! 115: unlink(sa.sun_path);
! 116:
! 117: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
! 118: return (-1);
! 119:
! 120: mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
! 121: if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1)
! 122: return (-1);
! 123: umask(mask);
! 124:
! 125: if (listen(fd, 128) == -1)
! 126: return (-1);
! 127: setblocking(fd, 0);
! 128:
! 129: return (fd);
! 130: }
! 131:
! 132: /* Fork new server. */
! 133: int
! 134: server_start(struct event_base *base, int lockfd, char *lockfile)
! 135: {
! 136: int pair[2];
! 137:
! 138: if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
! 139: fatal("socketpair failed");
! 140:
! 141: server_proc = proc_start("server", base, 1, server_signal);
! 142: if (server_proc == NULL) {
! 143: close(pair[1]);
! 144: return (pair[0]);
! 145: }
! 146: close(pair[0]);
! 147:
! 148: if (log_get_level() > 3)
! 149: tty_create_log();
! 150: if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
! 151: "tty ps", NULL) != 0)
! 152: fatal("pledge failed");
! 153:
! 154: RB_INIT(&windows);
! 155: RB_INIT(&all_window_panes);
! 156: TAILQ_INIT(&clients);
! 157: RB_INIT(&sessions);
! 158: RB_INIT(&session_groups);
! 159: key_bindings_init();
! 160:
! 161: gettimeofday(&start_time, NULL);
! 162:
! 163: server_fd = server_create_socket();
! 164: if (server_fd == -1)
! 165: fatal("couldn't create socket");
! 166: server_update_socket();
! 167: server_client_create(pair[1]);
! 168:
! 169: if (lockfd >= 0) {
! 170: unlink(lockfile);
! 171: free(lockfile);
! 172: close(lockfd);
! 173: }
! 174:
! 175: start_cfg();
! 176:
! 177: status_prompt_load_history();
! 178:
! 179: server_add_accept(0);
! 180:
! 181: proc_loop(server_proc, server_loop);
! 182: status_prompt_save_history();
! 183: exit(0);
! 184: }
! 185:
! 186: /* Server loop callback. */
! 187: static int
! 188: server_loop(void)
! 189: {
! 190: struct client *c;
! 191: u_int items;
! 192:
! 193: do {
! 194: items = cmdq_next(NULL);
! 195: TAILQ_FOREACH(c, &clients, entry) {
! 196: if (c->flags & CLIENT_IDENTIFIED)
! 197: items += cmdq_next(c);
! 198: }
! 199: } while (items != 0);
! 200:
! 201: server_client_loop();
! 202:
! 203: if (!options_get_number(global_options, "exit-unattached")) {
! 204: if (!RB_EMPTY(&sessions))
! 205: return (0);
! 206: }
! 207:
! 208: TAILQ_FOREACH(c, &clients, entry) {
! 209: if (c->session != NULL)
! 210: return (0);
! 211: }
! 212:
! 213: /*
! 214: * No attached clients therefore want to exit - flush any waiting
! 215: * clients but don't actually exit until they've gone.
! 216: */
! 217: cmd_wait_for_flush();
! 218: if (!TAILQ_EMPTY(&clients))
! 219: return (0);
! 220:
! 221: return (1);
! 222: }
! 223:
! 224: /* Exit the server by killing all clients and windows. */
! 225: static void
! 226: server_send_exit(void)
! 227: {
! 228: struct client *c, *c1;
! 229: struct session *s, *s1;
! 230:
! 231: cmd_wait_for_flush();
! 232:
! 233: TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
! 234: if (c->flags & CLIENT_SUSPENDED)
! 235: server_client_lost(c);
! 236: else
! 237: proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
! 238: c->session = NULL;
! 239: }
! 240:
! 241: RB_FOREACH_SAFE(s, sessions, &sessions, s1)
! 242: session_destroy(s);
! 243: }
! 244:
! 245: /* Update socket execute permissions based on whether sessions are attached. */
! 246: void
! 247: server_update_socket(void)
! 248: {
! 249: struct session *s;
! 250: static int last = -1;
! 251: int n, mode;
! 252: struct stat sb;
! 253:
! 254: n = 0;
! 255: RB_FOREACH(s, sessions, &sessions) {
! 256: if (!(s->flags & SESSION_UNATTACHED)) {
! 257: n++;
! 258: break;
! 259: }
! 260: }
! 261:
! 262: if (n != last) {
! 263: last = n;
! 264:
! 265: if (stat(socket_path, &sb) != 0)
! 266: return;
! 267: mode = sb.st_mode & ACCESSPERMS;
! 268: if (n != 0) {
! 269: if (mode & S_IRUSR)
! 270: mode |= S_IXUSR;
! 271: if (mode & S_IRGRP)
! 272: mode |= S_IXGRP;
! 273: if (mode & S_IROTH)
! 274: mode |= S_IXOTH;
! 275: } else
! 276: mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
! 277: chmod(socket_path, mode);
! 278: }
! 279: }
! 280:
! 281: /* Callback for server socket. */
! 282: static void
! 283: server_accept(int fd, short events, __unused void *data)
! 284: {
! 285: struct sockaddr_storage sa;
! 286: socklen_t slen = sizeof sa;
! 287: int newfd;
! 288:
! 289: server_add_accept(0);
! 290: if (!(events & EV_READ))
! 291: return;
! 292:
! 293: newfd = accept(fd, (struct sockaddr *) &sa, &slen);
! 294: if (newfd == -1) {
! 295: if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
! 296: return;
! 297: if (errno == ENFILE || errno == EMFILE) {
! 298: /* Delete and don't try again for 1 second. */
! 299: server_add_accept(1);
! 300: return;
! 301: }
! 302: fatal("accept failed");
! 303: }
! 304: if (server_exit) {
! 305: close(newfd);
! 306: return;
! 307: }
! 308: server_client_create(newfd);
! 309: }
! 310:
! 311: /*
! 312: * Add accept event. If timeout is nonzero, add as a timeout instead of a read
! 313: * event - used to backoff when running out of file descriptors.
! 314: */
! 315: void
! 316: server_add_accept(int timeout)
! 317: {
! 318: struct timeval tv = { timeout, 0 };
! 319:
! 320: if (event_initialized(&server_ev_accept))
! 321: event_del(&server_ev_accept);
! 322:
! 323: if (timeout == 0) {
! 324: event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
! 325: NULL);
! 326: event_add(&server_ev_accept, NULL);
! 327: } else {
! 328: event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
! 329: server_accept, NULL);
! 330: event_add(&server_ev_accept, &tv);
! 331: }
! 332: }
! 333:
! 334: /* Signal handler. */
! 335: static void
! 336: server_signal(int sig)
! 337: {
! 338: int fd;
! 339:
! 340: switch (sig) {
! 341: case SIGTERM:
! 342: server_exit = 1;
! 343: server_send_exit();
! 344: break;
! 345: case SIGCHLD:
! 346: server_child_signal();
! 347: break;
! 348: case SIGUSR1:
! 349: event_del(&server_ev_accept);
! 350: fd = server_create_socket();
! 351: if (fd != -1) {
! 352: close(server_fd);
! 353: server_fd = fd;
! 354: server_update_socket();
! 355: }
! 356: server_add_accept(0);
! 357: break;
! 358: }
! 359: }
! 360:
! 361: /* Handle SIGCHLD. */
! 362: static void
! 363: server_child_signal(void)
! 364: {
! 365: int status;
! 366: pid_t pid;
! 367:
! 368: for (;;) {
! 369: switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
! 370: case -1:
! 371: if (errno == ECHILD)
! 372: return;
! 373: fatal("waitpid failed");
! 374: case 0:
! 375: return;
! 376: }
! 377: if (WIFSTOPPED(status))
! 378: server_child_stopped(pid, status);
! 379: else if (WIFEXITED(status) || WIFSIGNALED(status))
! 380: server_child_exited(pid, status);
! 381: }
! 382: }
! 383:
! 384: /* Handle exited children. */
! 385: static void
! 386: server_child_exited(pid_t pid, int status)
! 387: {
! 388: struct window *w, *w1;
! 389: struct window_pane *wp;
! 390: struct job *job;
! 391:
! 392: RB_FOREACH_SAFE(w, windows, &windows, w1) {
! 393: TAILQ_FOREACH(wp, &w->panes, entry) {
! 394: if (wp->pid == pid) {
! 395: wp->status = status;
! 396: server_destroy_pane(wp, 1);
! 397: break;
! 398: }
! 399: }
! 400: }
! 401:
! 402: LIST_FOREACH(job, &all_jobs, lentry) {
! 403: if (pid == job->pid) {
! 404: job_died(job, status); /* might free job */
! 405: break;
! 406: }
! 407: }
! 408: }
! 409:
! 410: /* Handle stopped children. */
! 411: static void
! 412: server_child_stopped(pid_t pid, int status)
! 413: {
! 414: struct window *w;
! 415: struct window_pane *wp;
! 416:
! 417: if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
! 418: return;
! 419:
! 420: RB_FOREACH(w, windows, &windows) {
! 421: TAILQ_FOREACH(wp, &w->panes, entry) {
! 422: if (wp->pid == pid) {
! 423: if (killpg(pid, SIGCONT) != 0)
! 424: kill(pid, SIGCONT);
! 425: }
! 426: }
! 427: }
! 428: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to server.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / tmux