1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2003-2004 Sean M. Kelly <smkelly@FreeBSD.org> 5 * Copyright (c) 2013 iXsystems.com, 6 * author: Alfred Perlstein <alfred@freebsd.org> 7 * 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Software watchdog daemon. 34 */ 35 36 #include <sys/types.h> 37 #include <sys/mman.h> 38 #include <sys/param.h> 39 #include <sys/rtprio.h> 40 #include <sys/stat.h> 41 #include <sys/time.h> 42 #include <sys/sysctl.h> 43 #include <sys/watchdog.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <libutil.h> 49 #include <math.h> 50 #include <paths.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdint.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <strings.h> 57 #include <sysexits.h> 58 #include <syslog.h> 59 #include <unistd.h> 60 61 #include <getopt.h> 62 63 static long fetchtimeout(int opt, 64 const char *longopt, const char *myoptarg, int zero_ok); 65 static void parseargs(int, char *[]); 66 static int seconds_to_pow2ns(int); 67 static void sighandler(int); 68 static void watchdog_loop(void); 69 static int watchdog_init(void); 70 static int watchdog_onoff(int onoff); 71 static int watchdog_patpat(u_int timeout); 72 static void usage(void); 73 static int tstotv(struct timeval *tv, struct timespec *ts); 74 static int tvtohz(struct timeval *tv); 75 76 static int debugging = 0; 77 static int end_program = 0; 78 static const char *pidfile = _PATH_VARRUN "watchdogd.pid"; 79 static u_int timeout = WD_TO_128SEC; 80 static u_int exit_timeout = WD_TO_NEVER; 81 static u_int pretimeout = 0; 82 static u_int timeout_sec; 83 static u_int nap = 10; 84 static int passive = 0; 85 static int is_daemon = 0; 86 static int is_dry_run = 0; /* do not arm the watchdog, only 87 report on timing of the watch 88 program */ 89 static int do_timedog = 0; 90 static int do_syslog = 1; 91 static int fd = -1; 92 static int carp_thresh_seconds = -1; 93 static char *test_cmd = NULL; 94 95 static const char *getopt_shortopts; 96 97 static int pretimeout_set; 98 static int pretimeout_act; 99 static int pretimeout_act_set; 100 101 static int softtimeout_set; 102 static int softtimeout_act; 103 static int softtimeout_act_set; 104 105 static struct option longopts[] = { 106 { "debug", no_argument, &debugging, 1 }, 107 { "pretimeout", required_argument, &pretimeout_set, 1 }, 108 { "pretimeout-action", required_argument, &pretimeout_act_set, 1 }, 109 { "softtimeout", no_argument, &softtimeout_set, 1 }, 110 { "softtimeout-action", required_argument, &softtimeout_act_set, 1 }, 111 { NULL, 0, NULL, 0} 112 }; 113 114 /* 115 * Periodically pat the watchdog, preventing it from firing. 116 */ 117 int 118 main(int argc, char *argv[]) 119 { 120 struct rtprio rtp; 121 struct pidfh *pfh; 122 pid_t otherpid; 123 124 if (getuid() != 0) 125 errx(EX_SOFTWARE, "not super user"); 126 127 parseargs(argc, argv); 128 129 if (do_syslog) 130 openlog("watchdogd", LOG_CONS|LOG_NDELAY|LOG_PERROR, 131 LOG_DAEMON); 132 133 rtp.type = RTP_PRIO_REALTIME; 134 rtp.prio = 0; 135 if (rtprio(RTP_SET, 0, &rtp) == -1) 136 err(EX_OSERR, "rtprio"); 137 138 if (!is_dry_run && watchdog_init() == -1) 139 errx(EX_SOFTWARE, "unable to initialize watchdog"); 140 141 if (is_daemon) { 142 if (watchdog_onoff(1) == -1) 143 err(EX_OSERR, "patting the dog"); 144 145 pfh = pidfile_open(pidfile, 0600, &otherpid); 146 if (pfh == NULL) { 147 if (errno == EEXIST) { 148 watchdog_onoff(0); 149 errx(EX_SOFTWARE, "%s already running, pid: %d", 150 getprogname(), otherpid); 151 } 152 warn("Cannot open or create pidfile"); 153 } 154 155 if (debugging == 0 && daemon(0, 0) == -1) { 156 watchdog_onoff(0); 157 pidfile_remove(pfh); 158 err(EX_OSERR, "daemon"); 159 } 160 161 signal(SIGHUP, SIG_IGN); 162 signal(SIGINT, sighandler); 163 signal(SIGTERM, sighandler); 164 165 pidfile_write(pfh); 166 if (madvise(0, 0, MADV_PROTECT) != 0) 167 warn("madvise failed"); 168 if (mlockall(MCL_CURRENT | MCL_FUTURE) != 0) 169 warn("mlockall failed"); 170 171 watchdog_loop(); 172 173 /* exiting */ 174 pidfile_remove(pfh); 175 return (EX_OK); 176 } else { 177 if (passive) 178 timeout |= WD_PASSIVE; 179 else 180 timeout |= WD_ACTIVE; 181 if (watchdog_patpat(timeout) < 0) 182 err(EX_OSERR, "patting the dog"); 183 return (EX_OK); 184 } 185 } 186 187 static void 188 pow2ns_to_ts(int pow2ns, struct timespec *ts) 189 { 190 uint64_t ns; 191 192 ns = 1ULL << pow2ns; 193 ts->tv_sec = ns / 1000000000ULL; 194 ts->tv_nsec = ns % 1000000000ULL; 195 } 196 197 /* 198 * Convert a timeout in seconds to N where 2^N nanoseconds is close to 199 * "seconds". 200 * 201 * The kernel expects the timeouts for watchdogs in "2^N nanosecond format". 202 */ 203 static u_int 204 parse_timeout_to_pow2ns(char opt, const char *longopt, const char *myoptarg) 205 { 206 double a; 207 u_int rv; 208 struct timespec ts; 209 struct timeval tv; 210 int ticks; 211 char shortopt[] = "- "; 212 213 if (!longopt) 214 shortopt[1] = opt; 215 216 a = fetchtimeout(opt, longopt, myoptarg, 1); 217 218 if (a == 0) 219 rv = WD_TO_NEVER; 220 else 221 rv = seconds_to_pow2ns(a); 222 pow2ns_to_ts(rv, &ts); 223 tstotv(&tv, &ts); 224 ticks = tvtohz(&tv); 225 if (debugging) { 226 printf("Timeout for %s%s " 227 "is 2^%d nanoseconds " 228 "(in: %s sec -> out: %jd sec %ld ns -> %d ticks)\n", 229 longopt ? "-" : "", longopt ? longopt : shortopt, 230 rv, 231 myoptarg, (intmax_t)ts.tv_sec, ts.tv_nsec, ticks); 232 } 233 if (ticks <= 0) { 234 errx(1, "Timeout for %s%s is too small, please choose a higher timeout.", longopt ? "-" : "", longopt ? longopt : shortopt); 235 } 236 237 return (rv); 238 } 239 240 /* 241 * Catch signals and begin shutdown process. 242 */ 243 static void 244 sighandler(int signum) 245 { 246 247 if (signum == SIGINT || signum == SIGTERM) 248 end_program = 1; 249 } 250 251 /* 252 * Open the watchdog device. 253 */ 254 static int 255 watchdog_init(void) 256 { 257 258 if (is_dry_run) 259 return 0; 260 261 fd = open("/dev/" _PATH_WATCHDOG, O_RDWR); 262 if (fd >= 0) 263 return (0); 264 warn("Could not open watchdog device"); 265 return (-1); 266 } 267 268 /* 269 * If we are doing timing, then get the time. 270 */ 271 static int 272 watchdog_getuptime(struct timespec *tp) 273 { 274 int error; 275 276 if (!do_timedog) 277 return 0; 278 279 error = clock_gettime(CLOCK_UPTIME_FAST, tp); 280 if (error) 281 warn("clock_gettime"); 282 return (error); 283 } 284 285 static long 286 watchdog_check_dogfunction_time(struct timespec *tp_start, 287 struct timespec *tp_end) 288 { 289 struct timeval tv_start, tv_end, tv_now, tv; 290 const char *cmd_prefix, *cmd; 291 struct timespec tp_now; 292 int sec; 293 294 if (!do_timedog) 295 return (0); 296 297 TIMESPEC_TO_TIMEVAL(&tv_start, tp_start); 298 TIMESPEC_TO_TIMEVAL(&tv_end, tp_end); 299 timersub(&tv_end, &tv_start, &tv); 300 sec = tv.tv_sec; 301 if (sec < carp_thresh_seconds) 302 return (sec); 303 304 if (test_cmd) { 305 cmd_prefix = "Watchdog program"; 306 cmd = test_cmd; 307 } else { 308 cmd_prefix = "Watchdog operation"; 309 cmd = "stat(\"/etc\", &sb)"; 310 } 311 if (do_syslog) 312 syslog(LOG_CRIT, "%s: '%s' took too long: " 313 "%d.%06ld seconds >= %d seconds threshold", 314 cmd_prefix, cmd, sec, (long)tv.tv_usec, 315 carp_thresh_seconds); 316 else 317 warnx("%s: '%s' took too long: " 318 "%d.%06ld seconds >= %d seconds threshold", 319 cmd_prefix, cmd, sec, (long)tv.tv_usec, 320 carp_thresh_seconds); 321 322 /* 323 * Adjust the sleep interval again in case syslog(3) took a non-trivial 324 * amount of time to run. 325 */ 326 if (watchdog_getuptime(&tp_now)) 327 return (sec); 328 TIMESPEC_TO_TIMEVAL(&tv_now, &tp_now); 329 timersub(&tv_now, &tv_start, &tv); 330 sec = tv.tv_sec; 331 332 return (sec); 333 } 334 335 /* 336 * Main program loop which is iterated every second. 337 */ 338 static void 339 watchdog_loop(void) 340 { 341 struct timespec ts_start, ts_end; 342 struct stat sb; 343 long waited; 344 int error, failed; 345 346 while (end_program != 2) { 347 failed = 0; 348 349 error = watchdog_getuptime(&ts_start); 350 if (error) { 351 end_program = 1; 352 goto try_end; 353 } 354 355 if (test_cmd != NULL) 356 failed = system(test_cmd); 357 else 358 failed = stat("/etc", &sb); 359 360 error = watchdog_getuptime(&ts_end); 361 if (error) { 362 end_program = 1; 363 goto try_end; 364 } 365 366 if (failed == 0) 367 watchdog_patpat(timeout|WD_ACTIVE); 368 369 waited = watchdog_check_dogfunction_time(&ts_start, &ts_end); 370 if (nap - waited > 0) 371 sleep(nap - waited); 372 373 try_end: 374 if (end_program != 0) { 375 if (watchdog_onoff(0) == 0) { 376 end_program = 2; 377 } else { 378 warnx("Could not stop the watchdog, not exiting"); 379 end_program = 0; 380 } 381 } 382 } 383 } 384 385 /* 386 * Reset the watchdog timer. This function must be called periodically 387 * to keep the watchdog from firing. 388 */ 389 static int 390 watchdog_patpat(u_int t) 391 { 392 393 if (is_dry_run) 394 return 0; 395 396 return ioctl(fd, WDIOCPATPAT, &t); 397 } 398 399 /* 400 * Toggle the kernel's watchdog. This routine is used to enable and 401 * disable the watchdog. 402 */ 403 static int 404 watchdog_onoff(int onoff) 405 { 406 int error; 407 408 /* fake successful watchdog op if a dry run */ 409 if (is_dry_run) 410 return 0; 411 412 if (onoff) { 413 /* 414 * Call the WDIOC_SETSOFT regardless of softtimeout_set 415 * because we'll need to turn it off if someone had turned 416 * it on. 417 */ 418 error = ioctl(fd, WDIOC_SETSOFT, &softtimeout_set); 419 if (error) { 420 warn("setting WDIOC_SETSOFT %d", softtimeout_set); 421 return (error); 422 } 423 error = watchdog_patpat((timeout|WD_ACTIVE)); 424 if (error) { 425 warn("watchdog_patpat failed"); 426 goto failsafe; 427 } 428 if (softtimeout_act_set) { 429 error = ioctl(fd, WDIOC_SETSOFTTIMEOUTACT, 430 &softtimeout_act); 431 if (error) { 432 warn("setting WDIOC_SETSOFTTIMEOUTACT %d", 433 softtimeout_act); 434 goto failsafe; 435 } 436 } 437 if (pretimeout_set) { 438 error = ioctl(fd, WDIOC_SETPRETIMEOUT, &pretimeout); 439 if (error) { 440 warn("setting WDIOC_SETPRETIMEOUT %d", 441 pretimeout); 442 goto failsafe; 443 } 444 } 445 if (pretimeout_act_set) { 446 error = ioctl(fd, WDIOC_SETPRETIMEOUTACT, 447 &pretimeout_act); 448 if (error) { 449 warn("setting WDIOC_SETPRETIMEOUTACT %d", 450 pretimeout_act); 451 goto failsafe; 452 } 453 } 454 /* pat one more time for good measure */ 455 return watchdog_patpat((timeout|WD_ACTIVE)); 456 } else { 457 return watchdog_patpat(exit_timeout); 458 } 459 failsafe: 460 watchdog_patpat(exit_timeout); 461 return (error); 462 } 463 464 /* 465 * Tell user how to use the program. 466 */ 467 static void 468 usage(void) 469 { 470 if (is_daemon) 471 fprintf(stderr, "usage:\n" 472 " watchdogd [-dnSw] [-e cmd] [-I pidfile] [-s sleep] [-t timeout]\n" 473 " [-T script_timeout] [-x exit_timeout]\n" 474 " [--debug]\n" 475 " [--pretimeout seconds] [-pretimeout-action action]\n" 476 " [--softtimeout] [-softtimeout-action action]\n" 477 ); 478 else 479 fprintf(stderr, "usage: watchdog [-d] [-t timeout]\n"); 480 exit(EX_USAGE); 481 } 482 483 static long 484 fetchtimeout(int opt, const char *longopt, const char *myoptarg, int zero_ok) 485 { 486 const char *errstr; 487 char *p; 488 long rv; 489 490 errstr = NULL; 491 p = NULL; 492 errno = 0; 493 rv = strtol(myoptarg, &p, 0); 494 if ((p != NULL && *p != '\0') || errno != 0) 495 errstr = "is not a number"; 496 if (rv < 0 || (!zero_ok && rv == 0)) 497 errstr = "must be greater than zero"; 498 if (errstr) { 499 if (longopt) 500 errx(EX_USAGE, "--%s argument %s", longopt, errstr); 501 else 502 errx(EX_USAGE, "-%c argument %s", opt, errstr); 503 } 504 return (rv); 505 } 506 507 struct act_tbl { 508 const char *at_act; 509 int at_value; 510 }; 511 512 static const struct act_tbl act_tbl[] = { 513 { "panic", WD_SOFT_PANIC }, 514 { "ddb", WD_SOFT_DDB }, 515 { "log", WD_SOFT_LOG }, 516 { "printf", WD_SOFT_PRINTF }, 517 { NULL, 0 } 518 }; 519 520 static void 521 timeout_act_error(const char *lopt, const char *badact) 522 { 523 char *opts, *oldopts; 524 int i; 525 526 opts = NULL; 527 for (i = 0; act_tbl[i].at_act != NULL; i++) { 528 oldopts = opts; 529 if (asprintf(&opts, "%s%s%s", 530 oldopts == NULL ? "" : oldopts, 531 oldopts == NULL ? "" : ", ", 532 act_tbl[i].at_act) == -1) 533 err(EX_OSERR, "malloc"); 534 free(oldopts); 535 } 536 warnx("bad --%s argument '%s' must be one of (%s).", 537 lopt, badact, opts); 538 usage(); 539 } 540 541 /* 542 * Take a comma separated list of actions and or the flags 543 * together for the ioctl. 544 */ 545 static int 546 timeout_act_str2int(const char *lopt, const char *acts) 547 { 548 int i; 549 char *dupacts, *tofree; 550 char *o; 551 int rv = 0; 552 553 tofree = dupacts = strdup(acts); 554 if (!tofree) 555 err(EX_OSERR, "malloc"); 556 while ((o = strsep(&dupacts, ",")) != NULL) { 557 for (i = 0; act_tbl[i].at_act != NULL; i++) { 558 if (!strcmp(o, act_tbl[i].at_act)) { 559 rv |= act_tbl[i].at_value; 560 break; 561 } 562 } 563 if (act_tbl[i].at_act == NULL) 564 timeout_act_error(lopt, o); 565 } 566 free(tofree); 567 return rv; 568 } 569 570 int 571 tstotv(struct timeval *tv, struct timespec *ts) 572 { 573 574 tv->tv_sec = ts->tv_sec; 575 tv->tv_usec = ts->tv_nsec / 1000; 576 return 0; 577 } 578 579 /* 580 * Convert a timeval to a number of ticks. 581 * Mostly copied from the kernel. 582 */ 583 int 584 tvtohz(struct timeval *tv) 585 { 586 register unsigned long ticks; 587 register long sec, usec; 588 int hz; 589 size_t hzsize; 590 int error; 591 int tick; 592 593 hzsize = sizeof(hz); 594 595 error = sysctlbyname("kern.hz", &hz, &hzsize, NULL, 0); 596 if (error) 597 err(1, "sysctlbyname kern.hz"); 598 599 tick = 1000000 / hz; 600 601 /* 602 * If the number of usecs in the whole seconds part of the time 603 * difference fits in a long, then the total number of usecs will 604 * fit in an unsigned long. Compute the total and convert it to 605 * ticks, rounding up and adding 1 to allow for the current tick 606 * to expire. Rounding also depends on unsigned long arithmetic 607 * to avoid overflow. 608 * 609 * Otherwise, if the number of ticks in the whole seconds part of 610 * the time difference fits in a long, then convert the parts to 611 * ticks separately and add, using similar rounding methods and 612 * overflow avoidance. This method would work in the previous 613 * case but it is slightly slower and assumes that hz is integral. 614 * 615 * Otherwise, round the time difference down to the maximum 616 * representable value. 617 * 618 * If ints have 32 bits, then the maximum value for any timeout in 619 * 10ms ticks is 248 days. 620 */ 621 sec = tv->tv_sec; 622 usec = tv->tv_usec; 623 if (usec < 0) { 624 sec--; 625 usec += 1000000; 626 } 627 if (sec < 0) { 628 #ifdef DIAGNOSTIC 629 if (usec > 0) { 630 sec++; 631 usec -= 1000000; 632 } 633 printf("tvotohz: negative time difference %ld sec %ld usec\n", 634 sec, usec); 635 #endif 636 ticks = 1; 637 } else if (sec <= LONG_MAX / 1000000) 638 ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1)) 639 / tick + 1; 640 else if (sec <= LONG_MAX / hz) 641 ticks = sec * hz 642 + ((unsigned long)usec + (tick - 1)) / tick + 1; 643 else 644 ticks = LONG_MAX; 645 if (ticks > INT_MAX) 646 ticks = INT_MAX; 647 return ((int)ticks); 648 } 649 650 static int 651 seconds_to_pow2ns(int seconds) 652 { 653 uint64_t power; 654 uint64_t ns; 655 uint64_t shifted; 656 657 if (seconds <= 0) 658 errx(1, "seconds %d < 0", seconds); 659 ns = ((uint64_t)seconds) * 1000000000ULL; 660 power = flsll(ns); 661 shifted = 1ULL << power; 662 if (shifted <= ns) { 663 power++; 664 } 665 if (debugging) { 666 printf("shifted %lld\n", (long long)shifted); 667 printf("seconds_to_pow2ns: seconds: %d, ns %lld, power %d\n", 668 seconds, (long long)ns, (int)power); 669 } 670 return (power); 671 } 672 673 674 /* 675 * Handle the few command line arguments supported. 676 */ 677 static void 678 parseargs(int argc, char *argv[]) 679 { 680 struct timespec ts; 681 int longindex; 682 int c; 683 const char *lopt; 684 685 /* Get the default value of timeout_sec from the default timeout. */ 686 pow2ns_to_ts(timeout, &ts); 687 timeout_sec = ts.tv_sec; 688 689 /* 690 * if we end with a 'd' aka 'watchdogd' then we are the daemon program, 691 * otherwise run as a command line utility. 692 */ 693 c = strlen(argv[0]); 694 if (argv[0][c - 1] == 'd') 695 is_daemon = 1; 696 697 if (is_daemon) 698 getopt_shortopts = "I:de:ns:t:ST:wx:?"; 699 else 700 getopt_shortopts = "dt:?"; 701 702 while ((c = getopt_long(argc, argv, getopt_shortopts, longopts, 703 &longindex)) != -1) { 704 switch (c) { 705 case 'I': 706 pidfile = optarg; 707 break; 708 case 'd': 709 debugging = 1; 710 break; 711 case 'e': 712 test_cmd = strdup(optarg); 713 break; 714 case 'n': 715 is_dry_run = 1; 716 break; 717 #ifdef notyet 718 case 'p': 719 passive = 1; 720 break; 721 #endif 722 case 's': 723 nap = fetchtimeout(c, NULL, optarg, 0); 724 break; 725 case 'S': 726 do_syslog = 0; 727 break; 728 case 't': 729 timeout_sec = atoi(optarg); 730 timeout = parse_timeout_to_pow2ns(c, NULL, optarg); 731 if (debugging) 732 printf("Timeout is 2^%d nanoseconds\n", 733 timeout); 734 break; 735 case 'T': 736 carp_thresh_seconds = 737 fetchtimeout(c, "NULL", optarg, 0); 738 break; 739 case 'w': 740 do_timedog = 1; 741 break; 742 case 'x': 743 exit_timeout = parse_timeout_to_pow2ns(c, NULL, optarg); 744 if (exit_timeout != 0) 745 exit_timeout |= WD_ACTIVE; 746 break; 747 case 0: 748 lopt = longopts[longindex].name; 749 if (!strcmp(lopt, "pretimeout")) { 750 pretimeout = fetchtimeout(0, lopt, optarg, 0); 751 } else if (!strcmp(lopt, "pretimeout-action")) { 752 pretimeout_act = timeout_act_str2int(lopt, 753 optarg); 754 } else if (!strcmp(lopt, "softtimeout-action")) { 755 softtimeout_act = timeout_act_str2int(lopt, 756 optarg); 757 } else { 758 /* warnx("bad option at index %d: %s", optind, 759 argv[optind]); 760 usage(); 761 */ 762 } 763 break; 764 case '?': 765 default: 766 usage(); 767 /* NOTREACHED */ 768 } 769 } 770 771 if (nap > timeout_sec / 2) 772 nap = timeout_sec / 2; 773 774 if (carp_thresh_seconds == -1) 775 carp_thresh_seconds = nap; 776 777 if (argc != optind) 778 errx(EX_USAGE, "extra arguments."); 779 if (is_daemon && timeout < WD_TO_1SEC) 780 errx(EX_USAGE, "-t argument is less than one second."); 781 if (pretimeout_set) { 782 if (pretimeout >= timeout_sec) { 783 errx(EX_USAGE, 784 "pretimeout (%d) >= timeout (%d -> %ld)\n" 785 "see manual section TIMEOUT RESOLUTION", 786 pretimeout, timeout_sec, (long)ts.tv_sec); 787 } 788 } 789 } 790