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/file.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 <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 34 #include "tmux.h" 35 36 struct tmuxproc *client_proc; 37 struct tmuxpeer *client_peer; 38 int client_flags; 39 struct event client_stdin; 40 enum { 41 CLIENT_EXIT_NONE, 42 CLIENT_EXIT_DETACHED, 43 CLIENT_EXIT_DETACHED_HUP, 44 CLIENT_EXIT_LOST_TTY, 45 CLIENT_EXIT_TERMINATED, 46 CLIENT_EXIT_LOST_SERVER, 47 CLIENT_EXIT_EXITED, 48 CLIENT_EXIT_SERVER_EXITED, 49 } client_exitreason = CLIENT_EXIT_NONE; 50 int client_exitval; 51 enum msgtype client_exittype; 52 const char *client_exitsession; 53 int client_attached; 54 55 __dead void client_exec(const char *,const char *); 56 int client_get_lock(char *); 57 int client_connect(struct event_base *, const char *, int); 58 void client_send_identify(const char *, const char *); 59 void client_stdin_callback(int, short, void *); 60 void client_write(int, const char *, size_t); 61 void client_signal(int); 62 void client_dispatch(struct imsg *, void *); 63 void client_dispatch_attached(struct imsg *); 64 void client_dispatch_wait(struct imsg *, const char *); 65 const char *client_exit_message(void); 66 67 /* 68 * Get server create lock. If already held then server start is happening in 69 * another client, so block until the lock is released and return -2 to 70 * retry. Return -1 on failure to continue and start the server anyway. 71 */ 72 int 73 client_get_lock(char *lockfile) 74 { 75 int lockfd; 76 77 log_debug("lock file is %s", lockfile); 78 79 if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) { 80 log_debug("open failed: %s", strerror(errno)); 81 return (-1); 82 } 83 84 if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) { 85 log_debug("flock failed: %s", strerror(errno)); 86 if (errno != EAGAIN) 87 return (lockfd); 88 while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR) 89 /* nothing */; 90 close(lockfd); 91 return (-2); 92 } 93 log_debug("flock succeeded"); 94 95 return (lockfd); 96 } 97 98 /* Connect client to server. */ 99 int 100 client_connect(struct event_base *base, const char *path, int start_server) 101 { 102 struct sockaddr_un sa; 103 size_t size; 104 int fd, lockfd = -1, locked = 0; 105 char *lockfile = NULL; 106 107 memset(&sa, 0, sizeof sa); 108 sa.sun_family = AF_UNIX; 109 size = strlcpy(sa.sun_path, path, sizeof sa.sun_path); 110 if (size >= sizeof sa.sun_path) { 111 errno = ENAMETOOLONG; 112 return (-1); 113 } 114 log_debug("socket is %s", path); 115 116 retry: 117 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 118 return (-1); 119 120 log_debug("trying connect"); 121 if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) { 122 log_debug("connect failed: %s", strerror(errno)); 123 if (errno != ECONNREFUSED && errno != ENOENT) 124 goto failed; 125 if (!start_server) 126 goto failed; 127 close(fd); 128 129 if (!locked) { 130 xasprintf(&lockfile, "%s.lock", path); 131 if ((lockfd = client_get_lock(lockfile)) < 0) { 132 log_debug("didn't get lock (%d)", lockfd); 133 134 free(lockfile); 135 lockfile = NULL; 136 137 if (lockfd == -2) 138 goto retry; 139 } 140 log_debug("got lock (%d)", lockfd); 141 142 /* 143 * Always retry at least once, even if we got the lock, 144 * because another client could have taken the lock, 145 * started the server and released the lock between our 146 * connect() and flock(). 147 */ 148 locked = 1; 149 goto retry; 150 } 151 152 if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) { 153 free(lockfile); 154 close(lockfd); 155 return (-1); 156 } 157 fd = server_start(base, lockfd, lockfile); 158 } 159 160 if (locked && lockfd >= 0) { 161 free(lockfile); 162 close(lockfd); 163 } 164 setblocking(fd, 0); 165 return (fd); 166 167 failed: 168 if (locked) { 169 free(lockfile); 170 close(lockfd); 171 } 172 close(fd); 173 return (-1); 174 } 175 176 /* Get exit string from reason number. */ 177 const char * 178 client_exit_message(void) 179 { 180 static char msg[256]; 181 182 switch (client_exitreason) { 183 case CLIENT_EXIT_NONE: 184 break; 185 case CLIENT_EXIT_DETACHED: 186 if (client_exitsession != NULL) { 187 xsnprintf(msg, sizeof msg, "detached " 188 "(from session %s)", client_exitsession); 189 return (msg); 190 } 191 return ("detached"); 192 case CLIENT_EXIT_DETACHED_HUP: 193 if (client_exitsession != NULL) { 194 xsnprintf(msg, sizeof msg, "detached and SIGHUP " 195 "(from session %s)", client_exitsession); 196 return (msg); 197 } 198 return ("detached and SIGHUP"); 199 case CLIENT_EXIT_LOST_TTY: 200 return ("lost tty"); 201 case CLIENT_EXIT_TERMINATED: 202 return ("terminated"); 203 case CLIENT_EXIT_LOST_SERVER: 204 return ("lost server"); 205 case CLIENT_EXIT_EXITED: 206 return ("exited"); 207 case CLIENT_EXIT_SERVER_EXITED: 208 return ("server exited"); 209 } 210 return ("unknown reason"); 211 } 212 213 /* Client main loop. */ 214 int 215 client_main(struct event_base *base, int argc, char **argv, int flags, 216 const char *shellcmd) 217 { 218 struct cmd *cmd; 219 struct cmd_list *cmdlist; 220 struct msg_command_data *data; 221 int cmdflags, fd, i; 222 const char *ttynam, *cwd; 223 pid_t ppid; 224 enum msgtype msg; 225 char *cause, path[PATH_MAX]; 226 struct termios tio, saved_tio; 227 size_t size; 228 229 /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */ 230 signal(SIGCHLD, SIG_IGN); 231 232 /* Save the flags. */ 233 client_flags = flags; 234 235 /* Set up the initial command. */ 236 cmdflags = 0; 237 if (shellcmd != NULL) { 238 msg = MSG_SHELL; 239 cmdflags = CMD_STARTSERVER; 240 } else if (argc == 0) { 241 msg = MSG_COMMAND; 242 cmdflags = CMD_STARTSERVER; 243 } else { 244 msg = MSG_COMMAND; 245 246 /* 247 * It sucks parsing the command string twice (in client and 248 * later in server) but it is necessary to get the start server 249 * flag. 250 */ 251 cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause); 252 if (cmdlist == NULL) { 253 fprintf(stderr, "%s\n", cause); 254 return (1); 255 } 256 cmdflags &= ~CMD_STARTSERVER; 257 TAILQ_FOREACH(cmd, &cmdlist->list, qentry) { 258 if (cmd->entry->flags & CMD_STARTSERVER) 259 cmdflags |= CMD_STARTSERVER; 260 } 261 cmd_list_free(cmdlist); 262 } 263 264 /* Create client process structure (starts logging). */ 265 client_proc = proc_start("client", base, 0, client_signal); 266 267 /* Initialize the client socket and start the server. */ 268 fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER); 269 if (fd == -1) { 270 if (errno == ECONNREFUSED) { 271 fprintf(stderr, "no server running on %s\n", 272 socket_path); 273 } else { 274 fprintf(stderr, "error connecting to %s (%s)\n", 275 socket_path, strerror(errno)); 276 } 277 return (1); 278 } 279 client_peer = proc_add_peer(client_proc, fd, client_dispatch, 280 __UNCONST(shellcmd)); 281 282 /* Save these before pledge(). */ 283 if ((cwd = getcwd(path, sizeof path)) == NULL) { 284 if ((cwd = find_home()) == NULL) 285 cwd = "/"; 286 } 287 if ((ttynam = ttyname(STDIN_FILENO)) == NULL) 288 ttynam = ""; 289 290 #ifdef __OpenBSD__ 291 /* 292 * Drop privileges for client. "proc exec" is needed for -c and for 293 * locking (which uses system(3)). 294 * 295 * "tty" is needed to restore termios(4) and also for some reason -CC 296 * does not work properly without it (input is not recognised). 297 * 298 * "sendfd" is dropped later in client_dispatch_wait(). 299 */ 300 if (pledge("stdio unix sendfd proc exec tty", NULL) != 0) 301 fatal("pledge failed"); 302 #endif 303 304 /* Free stuff that is not used in the client. */ 305 options_free(global_options); 306 options_free(global_s_options); 307 options_free(global_w_options); 308 environ_free(global_environ); 309 310 /* Create stdin handler. */ 311 setblocking(STDIN_FILENO, 0); 312 event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST, 313 client_stdin_callback, NULL); 314 if (client_flags & CLIENT_CONTROLCONTROL) { 315 if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) 316 fatal("tcgetattr failed"); 317 cfmakeraw(&tio); 318 tio.c_iflag = ICRNL|IXANY; 319 tio.c_oflag = OPOST|ONLCR; 320 #ifdef NOKERNINFO 321 tio.c_lflag = NOKERNINFO; 322 #endif 323 tio.c_cflag = CREAD|CS8|HUPCL; 324 tio.c_cc[VMIN] = 1; 325 tio.c_cc[VTIME] = 0; 326 cfsetispeed(&tio, cfgetispeed(&saved_tio)); 327 cfsetospeed(&tio, cfgetospeed(&saved_tio)); 328 tcsetattr(STDIN_FILENO, TCSANOW, &tio); 329 } 330 331 /* Send identify messages. */ 332 client_send_identify(ttynam, cwd); 333 334 /* Send first command. */ 335 if (msg == MSG_COMMAND) { 336 /* How big is the command? */ 337 size = 0; 338 for (i = 0; i < argc; i++) 339 size += strlen(argv[i]) + 1; 340 data = xmalloc((sizeof *data) + size); 341 342 /* Prepare command for server. */ 343 data->argc = argc; 344 if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) { 345 fprintf(stderr, "command too long\n"); 346 free(data); 347 return (1); 348 } 349 size += sizeof *data; 350 351 /* Send the command. */ 352 if (proc_send(client_peer, msg, -1, data, size) != 0) { 353 fprintf(stderr, "failed to send command\n"); 354 free(data); 355 return (1); 356 } 357 free(data); 358 } else if (msg == MSG_SHELL) 359 proc_send(client_peer, msg, -1, NULL, 0); 360 361 /* Start main loop. */ 362 proc_loop(client_proc, NULL); 363 364 /* Print the exit message, if any, and exit. */ 365 if (client_attached) { 366 if (client_exitreason != CLIENT_EXIT_NONE) 367 printf("[%s]\n", client_exit_message()); 368 369 ppid = getppid(); 370 if (client_exittype == MSG_DETACHKILL && ppid > 1) 371 kill(ppid, SIGHUP); 372 } else if (client_flags & CLIENT_CONTROLCONTROL) { 373 if (client_exitreason != CLIENT_EXIT_NONE) 374 printf("%%exit %s\n", client_exit_message()); 375 else 376 printf("%%exit\n"); 377 printf("\033\\"); 378 tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio); 379 } else if (client_exitreason != CLIENT_EXIT_NONE) 380 fprintf(stderr, "%s\n", client_exit_message()); 381 setblocking(STDIN_FILENO, 1); 382 return (client_exitval); 383 } 384 385 /* Send identify messages to server. */ 386 void 387 client_send_identify(const char *ttynam, const char *cwd) 388 { 389 const char *s; 390 char **ss; 391 size_t sslen; 392 int fd, flags = client_flags; 393 pid_t pid; 394 395 proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags); 396 397 if ((s = getenv("TERM")) == NULL) 398 s = ""; 399 proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1); 400 401 proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam, 402 strlen(ttynam) + 1); 403 proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1); 404 405 if ((fd = dup(STDIN_FILENO)) == -1) 406 fatal("dup failed"); 407 proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0); 408 409 pid = getpid(); 410 proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid); 411 412 for (ss = environ; *ss != NULL; ss++) { 413 sslen = strlen(*ss) + 1; 414 if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) 415 continue; 416 proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen); 417 } 418 419 proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0); 420 } 421 422 /* Callback for client stdin read events. */ 423 void 424 client_stdin_callback(__unused int fd, __unused short events, 425 __unused void *arg) 426 { 427 struct msg_stdin_data data; 428 429 data.size = read(STDIN_FILENO, data.data, sizeof data.data); 430 if (data.size < 0 && (errno == EINTR || errno == EAGAIN)) 431 return; 432 433 proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data); 434 if (data.size <= 0) 435 event_del(&client_stdin); 436 } 437 438 /* Force write to file descriptor. */ 439 void 440 client_write(int fd, const char *data, size_t size) 441 { 442 ssize_t used; 443 444 while (size != 0) { 445 used = write(fd, data, size); 446 if (used == -1) { 447 if (errno == EINTR || errno == EAGAIN) 448 continue; 449 break; 450 } 451 data += used; 452 size -= used; 453 } 454 } 455 456 /* Run command in shell; used for -c. */ 457 __dead void 458 client_exec(const char *shell, const char *shellcmd) 459 { 460 const char *name, *ptr; 461 char *argv0; 462 463 log_debug("shell %s, command %s", shell, shellcmd); 464 465 ptr = strrchr(shell, '/'); 466 if (ptr != NULL && *(ptr + 1) != '\0') 467 name = ptr + 1; 468 else 469 name = shell; 470 if (client_flags & CLIENT_LOGIN) 471 xasprintf(&argv0, "-%s", name); 472 else 473 xasprintf(&argv0, "%s", name); 474 setenv("SHELL", shell, 1); 475 476 setblocking(STDIN_FILENO, 1); 477 setblocking(STDOUT_FILENO, 1); 478 setblocking(STDERR_FILENO, 1); 479 closefrom(STDERR_FILENO + 1); 480 481 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 482 fatal("execl failed"); 483 } 484 485 /* Callback to handle signals in the client. */ 486 void 487 client_signal(int sig) 488 { 489 struct sigaction sigact; 490 int status; 491 492 if (sig == SIGCHLD) 493 waitpid(WAIT_ANY, &status, WNOHANG); 494 else if (!client_attached) { 495 if (sig == SIGTERM) 496 proc_exit(client_proc); 497 } else { 498 switch (sig) { 499 case SIGHUP: 500 client_exitreason = CLIENT_EXIT_LOST_TTY; 501 client_exitval = 1; 502 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 503 break; 504 case SIGTERM: 505 client_exitreason = CLIENT_EXIT_TERMINATED; 506 client_exitval = 1; 507 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 508 break; 509 case SIGWINCH: 510 proc_send(client_peer, MSG_RESIZE, -1, NULL, 0); 511 break; 512 case SIGCONT: 513 memset(&sigact, 0, sizeof sigact); 514 sigemptyset(&sigact.sa_mask); 515 sigact.sa_flags = SA_RESTART; 516 sigact.sa_handler = SIG_IGN; 517 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 518 fatal("sigaction failed"); 519 proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0); 520 break; 521 } 522 } 523 } 524 525 /* Callback for client read events. */ 526 void 527 client_dispatch(struct imsg *imsg, void *arg) 528 { 529 if (imsg == NULL) { 530 client_exitreason = CLIENT_EXIT_LOST_SERVER; 531 client_exitval = 1; 532 proc_exit(client_proc); 533 return; 534 } 535 536 if (client_attached) 537 client_dispatch_attached(imsg); 538 else 539 client_dispatch_wait(imsg, arg); 540 } 541 542 /* Dispatch imsgs when in wait state (before MSG_READY). */ 543 void 544 client_dispatch_wait(struct imsg *imsg, const char *shellcmd) 545 { 546 char *data; 547 ssize_t datalen; 548 struct msg_stdout_data stdoutdata; 549 struct msg_stderr_data stderrdata; 550 int retval; 551 #ifdef __OpenBSD__ 552 static int pledge_applied; 553 554 /* 555 * "sendfd" is no longer required once all of the identify messages 556 * have been sent. We know the server won't send us anything until that 557 * point (because we don't ask it to), so we can drop "sendfd" once we 558 * get the first message from the server. 559 */ 560 if (!pledge_applied) { 561 if (pledge("stdio unix proc exec tty", NULL) != 0) 562 fatal("pledge failed"); 563 pledge_applied = 1; 564 }; 565 #endif 566 567 data = imsg->data; 568 datalen = imsg->hdr.len - IMSG_HEADER_SIZE; 569 570 switch (imsg->hdr.type) { 571 case MSG_EXIT: 572 case MSG_SHUTDOWN: 573 if (datalen != sizeof retval && datalen != 0) 574 fatalx("bad MSG_EXIT size"); 575 if (datalen == sizeof retval) { 576 memcpy(&retval, data, sizeof retval); 577 client_exitval = retval; 578 } 579 proc_exit(client_proc); 580 break; 581 case MSG_READY: 582 if (datalen != 0) 583 fatalx("bad MSG_READY size"); 584 585 event_del(&client_stdin); 586 client_attached = 1; 587 proc_send(client_peer, MSG_RESIZE, -1, NULL, 0); 588 break; 589 case MSG_STDIN: 590 if (datalen != 0) 591 fatalx("bad MSG_STDIN size"); 592 593 event_add(&client_stdin, NULL); 594 break; 595 case MSG_STDOUT: 596 if (datalen != sizeof stdoutdata) 597 fatalx("bad MSG_STDOUT size"); 598 memcpy(&stdoutdata, data, sizeof stdoutdata); 599 600 client_write(STDOUT_FILENO, stdoutdata.data, 601 stdoutdata.size); 602 break; 603 case MSG_STDERR: 604 if (datalen != sizeof stderrdata) 605 fatalx("bad MSG_STDERR size"); 606 memcpy(&stderrdata, data, sizeof stderrdata); 607 608 client_write(STDERR_FILENO, stderrdata.data, 609 stderrdata.size); 610 break; 611 case MSG_VERSION: 612 if (datalen != 0) 613 fatalx("bad MSG_VERSION size"); 614 615 fprintf(stderr, "protocol version mismatch " 616 "(client %d, server %u)\n", PROTOCOL_VERSION, 617 imsg->hdr.peerid & 0xff); 618 client_exitval = 1; 619 proc_exit(client_proc); 620 break; 621 case MSG_SHELL: 622 if (datalen == 0 || data[datalen - 1] != '\0') 623 fatalx("bad MSG_SHELL string"); 624 625 clear_signals(0); 626 client_exec(data, shellcmd); 627 /* NOTREACHED */ 628 case MSG_DETACH: 629 case MSG_DETACHKILL: 630 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 631 break; 632 case MSG_EXITED: 633 proc_exit(client_proc); 634 break; 635 } 636 } 637 638 /* Dispatch imsgs in attached state (after MSG_READY). */ 639 void 640 client_dispatch_attached(struct imsg *imsg) 641 { 642 struct sigaction sigact; 643 char *data; 644 ssize_t datalen; 645 646 data = imsg->data; 647 datalen = imsg->hdr.len - IMSG_HEADER_SIZE; 648 649 switch (imsg->hdr.type) { 650 case MSG_DETACH: 651 case MSG_DETACHKILL: 652 if (datalen == 0 || data[datalen - 1] != '\0') 653 fatalx("bad MSG_DETACH string"); 654 655 client_exitsession = xstrdup(data); 656 client_exittype = imsg->hdr.type; 657 if (imsg->hdr.type == MSG_DETACHKILL) 658 client_exitreason = CLIENT_EXIT_DETACHED_HUP; 659 else 660 client_exitreason = CLIENT_EXIT_DETACHED; 661 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 662 break; 663 case MSG_EXIT: 664 if (datalen != 0 && datalen != sizeof (int)) 665 fatalx("bad MSG_EXIT size"); 666 667 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 668 client_exitreason = CLIENT_EXIT_EXITED; 669 break; 670 case MSG_EXITED: 671 if (datalen != 0) 672 fatalx("bad MSG_EXITED size"); 673 674 proc_exit(client_proc); 675 break; 676 case MSG_SHUTDOWN: 677 if (datalen != 0) 678 fatalx("bad MSG_SHUTDOWN size"); 679 680 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 681 client_exitreason = CLIENT_EXIT_SERVER_EXITED; 682 client_exitval = 1; 683 break; 684 case MSG_SUSPEND: 685 if (datalen != 0) 686 fatalx("bad MSG_SUSPEND size"); 687 688 memset(&sigact, 0, sizeof sigact); 689 sigemptyset(&sigact.sa_mask); 690 sigact.sa_flags = SA_RESTART; 691 sigact.sa_handler = SIG_DFL; 692 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 693 fatal("sigaction failed"); 694 kill(getpid(), SIGTSTP); 695 break; 696 case MSG_LOCK: 697 if (datalen == 0 || data[datalen - 1] != '\0') 698 fatalx("bad MSG_LOCK string"); 699 700 system(data); 701 proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0); 702 break; 703 } 704 } 705