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 __FBSDID("$FreeBSD$"); 38 39 #include <sys/mman.h> 40 #include <sys/param.h> 41 #include <sys/rtprio.h> 42 #include <sys/stat.h> 43 #include <sys/time.h> 44 #include <sys/sysctl.h> 45 #include <sys/watchdog.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <libutil.h> 51 #include <math.h> 52 #include <paths.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdint.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <strings.h> 59 #include <sysexits.h> 60 #include <syslog.h> 61 #include <unistd.h> 62 63 #include <getopt.h> 64 65 static long fetchtimeout(int opt, 66 const char *longopt, const char *myoptarg, int zero_ok); 67 static void parseargs(int, char *[]); 68 static int seconds_to_pow2ns(int); 69 static void sighandler(int); 70 static void watchdog_loop(void); 71 static int watchdog_init(void); 72 static int watchdog_onoff(int onoff); 73 static int watchdog_patpat(u_int timeout); 74 static void usage(void); 75 static int tstotv(struct timeval *tv, struct timespec *ts); 76 static int tvtohz(struct timeval *tv); 77 78 static int debugging = 0; 79 static int end_program = 0; 80 static const char *pidfile = _PATH_VARRUN "watchdogd.pid"; 81 static u_int timeout = WD_TO_128SEC; 82 static u_int exit_timeout = WD_TO_NEVER; 83 static u_int pretimeout = 0; 84 static u_int timeout_sec; 85 static u_int nap = 10; 86 static int passive = 0; 87 static int is_daemon = 0; 88 static int is_dry_run = 0; /* do not arm the watchdog, only 89 report on timing of the watch 90 program */ 91 static int do_timedog = 0; 92 static int do_syslog = 1; 93 static int fd = -1; 94 static int carp_thresh_seconds = -1; 95 static char *test_cmd = NULL; 96 97 static const char *getopt_shortopts; 98 99 static int pretimeout_set; 100 static int pretimeout_act; 101 static int pretimeout_act_set; 102 103 static int softtimeout_set; 104 static int softtimeout_act; 105 static int softtimeout_act_set; 106 107 static struct option longopts[] = { 108 { "debug", no_argument, &debugging, 1 }, 109 { "pretimeout", required_argument, &pretimeout_set, 1 }, 110 { "pretimeout-action", required_argument, &pretimeout_act_set, 1 }, 111 { "softtimeout", no_argument, &softtimeout_set, 1 }, 112 { "softtimeout-action", required_argument, &softtimeout_act_set, 1 }, 113 { NULL, 0, NULL, 0} 114 }; 115 116 /* 117 * Periodically pat the watchdog, preventing it from firing. 118 */ 119 int 120 main(int argc, char *argv[]) 121 { 122 struct rtprio rtp; 123 struct pidfh *pfh; 124 pid_t otherpid; 125 126 if (getuid() != 0) 127 errx(EX_SOFTWARE, "not super user"); 128 129 parseargs(argc, argv); 130 131 if (do_syslog) 132 openlog("watchdogd", LOG_CONS|LOG_NDELAY|LOG_PERROR, 133 LOG_DAEMON); 134 135 rtp.type = RTP_PRIO_REALTIME; 136 rtp.prio = 0; 137 if (rtprio(RTP_SET, 0, &rtp) == -1) 138 err(EX_OSERR, "rtprio"); 139 140 if (!is_dry_run && watchdog_init() == -1) 141 errx(EX_SOFTWARE, "unable to initialize watchdog"); 142 143 if (is_daemon) { 144 if (watchdog_onoff(1) == -1) 145 err(EX_OSERR, "patting the dog"); 146 147 pfh = pidfile_open(pidfile, 0600, &otherpid); 148 if (pfh == NULL) { 149 if (errno == EEXIST) { 150 watchdog_onoff(0); 151 errx(EX_SOFTWARE, "%s already running, pid: %d", 152 getprogname(), otherpid); 153 } 154 warn("Cannot open or create pidfile"); 155 } 156 157 if (debugging == 0 && daemon(0, 0) == -1) { 158 watchdog_onoff(0); 159 pidfile_remove(pfh); 160 err(EX_OSERR, "daemon"); 161 } 162 163 signal(SIGHUP, SIG_IGN); 164 signal(SIGINT, sighandler); 165 signal(SIGTERM, sighandler); 166 167 pidfile_write(pfh); 168 if (madvise(0, 0, MADV_PROTECT) != 0) 169 warn("madvise failed"); 170 if (mlockall(MCL_CURRENT | MCL_FUTURE) != 0) 171 warn("mlockall failed"); 172 173 watchdog_loop(); 174 175 /* exiting */ 176 pidfile_remove(pfh); 177 return (EX_OK); 178 } else { 179 if (passive) 180 timeout |= WD_PASSIVE; 181 else 182 timeout |= WD_ACTIVE; 183 if (watchdog_patpat(timeout) < 0) 184 err(EX_OSERR, "patting the dog"); 185 return (EX_OK); 186 } 187 } 188 189 static void 190 pow2ns_to_ts(int pow2ns, struct timespec *ts) 191 { 192 uint64_t ns; 193 194 ns = 1ULL << pow2ns; 195 ts->tv_sec = ns / 1000000000ULL; 196 ts->tv_nsec = ns % 1000000000ULL; 197 } 198 199 /* 200 * Convert a timeout in seconds to N where 2^N nanoseconds is close to 201 * "seconds". 202 * 203 * The kernel expects the timeouts for watchdogs in "2^N nanosecond format". 204 */ 205 static u_int 206 parse_timeout_to_pow2ns(char opt, const char *longopt, const char *myoptarg) 207 { 208 double a; 209 u_int rv; 210 struct timespec ts; 211 struct timeval tv; 212 int ticks; 213 char shortopt[] = "- "; 214 215 if (!longopt) 216 shortopt[1] = opt; 217 218 a = fetchtimeout(opt, longopt, myoptarg, 1); 219 220 if (a == 0) 221 rv = WD_TO_NEVER; 222 else 223 rv = seconds_to_pow2ns(a); 224 pow2ns_to_ts(rv, &ts); 225 tstotv(&tv, &ts); 226 ticks = tvtohz(&tv); 227 if (debugging) { 228 printf("Timeout for %s%s " 229 "is 2^%d nanoseconds " 230 "(in: %s sec -> out: %jd sec %ld ns -> %d ticks)\n", 231 longopt ? "-" : "", longopt ? longopt : shortopt, 232 rv, 233 myoptarg, (intmax_t)ts.tv_sec, ts.tv_nsec, ticks); 234 } 235 if (ticks <= 0) { 236 errx(1, "Timeout for %s%s is too small, please choose a higher timeout.", longopt ? "-" : "", longopt ? longopt : shortopt); 237 } 238 239 return (rv); 240 } 241 242 /* 243 * Catch signals and begin shutdown process. 244 */ 245 static void 246 sighandler(int signum) 247 { 248 249 if (signum == SIGINT || signum == SIGTERM) 250 end_program = 1; 251 } 252 253 /* 254 * Open the watchdog device. 255 */ 256 static int 257 watchdog_init(void) 258 { 259 260 if (is_dry_run) 261 return 0; 262 263 fd = open("/dev/" _PATH_WATCHDOG, O_RDWR); 264 if (fd >= 0) 265 return (0); 266 warn("Could not open watchdog device"); 267 return (-1); 268 } 269 270 /* 271 * If we are doing timing, then get the time. 272 */ 273 static int 274 watchdog_getuptime(struct timespec *tp) 275 { 276 int error; 277 278 if (!do_timedog) 279 return 0; 280 281 error = clock_gettime(CLOCK_UPTIME_FAST, tp); 282 if (error) 283 warn("clock_gettime"); 284 return (error); 285 } 286 287 static long 288 watchdog_check_dogfunction_time(struct timespec *tp_start, 289 struct timespec *tp_end) 290 { 291 struct timeval tv_start, tv_end, tv_now, tv; 292 const char *cmd_prefix, *cmd; 293 struct timespec tp_now; 294 int sec; 295 296 if (!do_timedog) 297 return (0); 298 299 TIMESPEC_TO_TIMEVAL(&tv_start, tp_start); 300 TIMESPEC_TO_TIMEVAL(&tv_end, tp_end); 301 timersub(&tv_end, &tv_start, &tv); 302 sec = tv.tv_sec; 303 if (sec < carp_thresh_seconds) 304 return (sec); 305 306 if (test_cmd) { 307 cmd_prefix = "Watchdog program"; 308 cmd = test_cmd; 309 } else { 310 cmd_prefix = "Watchdog operation"; 311 cmd = "stat(\"/etc\", &sb)"; 312 } 313 if (do_syslog) 314 syslog(LOG_CRIT, "%s: '%s' took too long: " 315 "%d.%06ld seconds >= %d seconds threshold", 316 cmd_prefix, cmd, sec, (long)tv.tv_usec, 317 carp_thresh_seconds); 318 else 319 warnx("%s: '%s' took too long: " 320 "%d.%06ld seconds >= %d seconds threshold", 321 cmd_prefix, cmd, sec, (long)tv.tv_usec, 322 carp_thresh_seconds); 323 324 /* 325 * Adjust the sleep interval again in case syslog(3) took a non-trivial 326 * amount of time to run. 327 */ 328 if (watchdog_getuptime(&tp_now)) 329 return (sec); 330 TIMESPEC_TO_TIMEVAL(&tv_now, &tp_now); 331 timersub(&tv_now, &tv_start, &tv); 332 sec = tv.tv_sec; 333 334 return (sec); 335 } 336 337 /* 338 * Main program loop which is iterated every second. 339 */ 340 static void 341 watchdog_loop(void) 342 { 343 struct timespec ts_start, ts_end; 344 struct stat sb; 345 long waited; 346 int error, failed; 347 348 while (end_program != 2) { 349 failed = 0; 350 351 error = watchdog_getuptime(&ts_start); 352 if (error) { 353 end_program = 1; 354 goto try_end; 355 } 356 357 if (test_cmd != NULL) 358 failed = system(test_cmd); 359 else 360 failed = stat("/etc", &sb); 361 362 error = watchdog_getuptime(&ts_end); 363 if (error) { 364 end_program = 1; 365 goto try_end; 366 } 367 368 if (failed == 0) 369 watchdog_patpat(timeout|WD_ACTIVE); 370 371 waited = watchdog_check_dogfunction_time(&ts_start, &ts_end); 372 if (nap - waited > 0) 373 sleep(nap - waited); 374 375 try_end: 376 if (end_program != 0) { 377 if (watchdog_onoff(0) == 0) { 378 end_program = 2; 379 } else { 380 warnx("Could not stop the watchdog, not exiting"); 381 end_program = 0; 382 } 383 } 384 } 385 } 386 387 /* 388 * Reset the watchdog timer. This function must be called periodically 389 * to keep the watchdog from firing. 390 */ 391 static int 392 watchdog_patpat(u_int t) 393 { 394 395 if (is_dry_run) 396 return 0; 397 398 return ioctl(fd, WDIOCPATPAT, &t); 399 } 400 401 /* 402 * Toggle the kernel's watchdog. This routine is used to enable and 403 * disable the watchdog. 404 */ 405 static int 406 watchdog_onoff(int onoff) 407 { 408 int error; 409 410 /* fake successful watchdog op if a dry run */ 411 if (is_dry_run) 412 return 0; 413 414 if (onoff) { 415 /* 416 * Call the WDIOC_SETSOFT regardless of softtimeout_set 417 * because we'll need to turn it off if someone had turned 418 * it on. 419 */ 420 error = ioctl(fd, WDIOC_SETSOFT, &softtimeout_set); 421 if (error) { 422 warn("setting WDIOC_SETSOFT %d", softtimeout_set); 423 return (error); 424 } 425 error = watchdog_patpat((timeout|WD_ACTIVE)); 426 if (error) { 427 warn("watchdog_patpat failed"); 428 goto failsafe; 429 } 430 if (softtimeout_act_set) { 431 error = ioctl(fd, WDIOC_SETSOFTTIMEOUTACT, 432 &softtimeout_act); 433 if (error) { 434 warn("setting WDIOC_SETSOFTTIMEOUTACT %d", 435 softtimeout_act); 436 goto failsafe; 437 } 438 } 439 if (pretimeout_set) { 440 error = ioctl(fd, WDIOC_SETPRETIMEOUT, &pretimeout); 441 if (error) { 442 warn("setting WDIOC_SETPRETIMEOUT %d", 443 pretimeout); 444 goto failsafe; 445 } 446 } 447 if (pretimeout_act_set) { 448 error = ioctl(fd, WDIOC_SETPRETIMEOUTACT, 449 &pretimeout_act); 450 if (error) { 451 warn("setting WDIOC_SETPRETIMEOUTACT %d", 452 pretimeout_act); 453 goto failsafe; 454 } 455 } 456 /* pat one more time for good measure */ 457 return watchdog_patpat((timeout|WD_ACTIVE)); 458 } else { 459 return watchdog_patpat(exit_timeout); 460 } 461 failsafe: 462 watchdog_patpat(exit_timeout); 463 return (error); 464 } 465 466 /* 467 * Tell user how to use the program. 468 */ 469 static void 470 usage(void) 471 { 472 if (is_daemon) 473 fprintf(stderr, "usage:\n" 474 " watchdogd [-dnSw] [-e cmd] [-I pidfile] [-s sleep] [-t timeout]\n" 475 " [-T script_timeout] [-x exit_timeout]\n" 476 " [--debug]\n" 477 " [--pretimeout seconds] [-pretimeout-action action]\n" 478 " [--softtimeout] [-softtimeout-action action]\n" 479 ); 480 else 481 fprintf(stderr, "usage: watchdog [-d] [-t timeout]\n"); 482 exit(EX_USAGE); 483 } 484 485 static long 486 fetchtimeout(int opt, const char *longopt, const char *myoptarg, int zero_ok) 487 { 488 const char *errstr; 489 char *p; 490 long rv; 491 492 errstr = NULL; 493 p = NULL; 494 errno = 0; 495 rv = strtol(myoptarg, &p, 0); 496 if ((p != NULL && *p != '\0') || errno != 0) 497 errstr = "is not a number"; 498 if (rv < 0 || (!zero_ok && rv == 0)) 499 errstr = "must be greater than zero"; 500 if (errstr) { 501 if (longopt) 502 errx(EX_USAGE, "--%s argument %s", longopt, errstr); 503 else 504 errx(EX_USAGE, "-%c argument %s", opt, errstr); 505 } 506 return (rv); 507 } 508 509 struct act_tbl { 510 const char *at_act; 511 int at_value; 512 }; 513 514 static const struct act_tbl act_tbl[] = { 515 { "panic", WD_SOFT_PANIC }, 516 { "ddb", WD_SOFT_DDB }, 517 { "log", WD_SOFT_LOG }, 518 { "printf", WD_SOFT_PRINTF }, 519 { NULL, 0 } 520 }; 521 522 static void 523 timeout_act_error(const char *lopt, const char *badact) 524 { 525 char *opts, *oldopts; 526 int i; 527 528 opts = NULL; 529 for (i = 0; act_tbl[i].at_act != NULL; i++) { 530 oldopts = opts; 531 if (asprintf(&opts, "%s%s%s", 532 oldopts == NULL ? "" : oldopts, 533 oldopts == NULL ? "" : ", ", 534 act_tbl[i].at_act) == -1) 535 err(EX_OSERR, "malloc"); 536 free(oldopts); 537 } 538 warnx("bad --%s argument '%s' must be one of (%s).", 539 lopt, badact, opts); 540 usage(); 541 } 542 543 /* 544 * Take a comma separated list of actions and or the flags 545 * together for the ioctl. 546 */ 547 static int 548 timeout_act_str2int(const char *lopt, const char *acts) 549 { 550 int i; 551 char *dupacts, *tofree; 552 char *o; 553 int rv = 0; 554 555 tofree = dupacts = strdup(acts); 556 if (!tofree) 557 err(EX_OSERR, "malloc"); 558 while ((o = strsep(&dupacts, ",")) != NULL) { 559 for (i = 0; act_tbl[i].at_act != NULL; i++) { 560 if (!strcmp(o, act_tbl[i].at_act)) { 561 rv |= act_tbl[i].at_value; 562 break; 563 } 564 } 565 if (act_tbl[i].at_act == NULL) 566 timeout_act_error(lopt, o); 567 } 568 free(tofree); 569 return rv; 570 } 571 572 int 573 tstotv(struct timeval *tv, struct timespec *ts) 574 { 575 576 tv->tv_sec = ts->tv_sec; 577 tv->tv_usec = ts->tv_nsec / 1000; 578 return 0; 579 } 580 581 /* 582 * Convert a timeval to a number of ticks. 583 * Mostly copied from the kernel. 584 */ 585 int 586 tvtohz(struct timeval *tv) 587 { 588 register unsigned long ticks; 589 register long sec, usec; 590 int hz; 591 size_t hzsize; 592 int error; 593 int tick; 594 595 hzsize = sizeof(hz); 596 597 error = sysctlbyname("kern.hz", &hz, &hzsize, NULL, 0); 598 if (error) 599 err(1, "sysctlbyname kern.hz"); 600 601 tick = 1000000 / hz; 602 603 /* 604 * If the number of usecs in the whole seconds part of the time 605 * difference fits in a long, then the total number of usecs will 606 * fit in an unsigned long. Compute the total and convert it to 607 * ticks, rounding up and adding 1 to allow for the current tick 608 * to expire. Rounding also depends on unsigned long arithmetic 609 * to avoid overflow. 610 * 611 * Otherwise, if the number of ticks in the whole seconds part of 612 * the time difference fits in a long, then convert the parts to 613 * ticks separately and add, using similar rounding methods and 614 * overflow avoidance. This method would work in the previous 615 * case but it is slightly slower and assumes that hz is integral. 616 * 617 * Otherwise, round the time difference down to the maximum 618 * representable value. 619 * 620 * If ints have 32 bits, then the maximum value for any timeout in 621 * 10ms ticks is 248 days. 622 */ 623 sec = tv->tv_sec; 624 usec = tv->tv_usec; 625 if (usec < 0) { 626 sec--; 627 usec += 1000000; 628 } 629 if (sec < 0) { 630 #ifdef DIAGNOSTIC 631 if (usec > 0) { 632 sec++; 633 usec -= 1000000; 634 } 635 printf("tvotohz: negative time difference %ld sec %ld usec\n", 636 sec, usec); 637 #endif 638 ticks = 1; 639 } else if (sec <= LONG_MAX / 1000000) 640 ticks = (sec * 1000000 + (unsigned long)usec + (tick - 1)) 641 / tick + 1; 642 else if (sec <= LONG_MAX / hz) 643 ticks = sec * hz 644 + ((unsigned long)usec + (tick - 1)) / tick + 1; 645 else 646 ticks = LONG_MAX; 647 if (ticks > INT_MAX) 648 ticks = INT_MAX; 649 return ((int)ticks); 650 } 651 652 static int 653 seconds_to_pow2ns(int seconds) 654 { 655 uint64_t power; 656 uint64_t ns; 657 uint64_t shifted; 658 659 if (seconds <= 0) 660 errx(1, "seconds %d < 0", seconds); 661 ns = ((uint64_t)seconds) * 1000000000ULL; 662 power = flsll(ns); 663 shifted = 1ULL << power; 664 if (shifted <= ns) { 665 power++; 666 } 667 if (debugging) { 668 printf("shifted %lld\n", (long long)shifted); 669 printf("seconds_to_pow2ns: seconds: %d, ns %lld, power %d\n", 670 seconds, (long long)ns, (int)power); 671 } 672 return (power); 673 } 674 675 676 /* 677 * Handle the few command line arguments supported. 678 */ 679 static void 680 parseargs(int argc, char *argv[]) 681 { 682 struct timespec ts; 683 int longindex; 684 int c; 685 const char *lopt; 686 687 /* Get the default value of timeout_sec from the default timeout. */ 688 pow2ns_to_ts(timeout, &ts); 689 timeout_sec = ts.tv_sec; 690 691 /* 692 * if we end with a 'd' aka 'watchdogd' then we are the daemon program, 693 * otherwise run as a command line utility. 694 */ 695 c = strlen(argv[0]); 696 if (argv[0][c - 1] == 'd') 697 is_daemon = 1; 698 699 if (is_daemon) 700 getopt_shortopts = "I:de:ns:t:ST:wx:?"; 701 else 702 getopt_shortopts = "dt:?"; 703 704 while ((c = getopt_long(argc, argv, getopt_shortopts, longopts, 705 &longindex)) != -1) { 706 switch (c) { 707 case 'I': 708 pidfile = optarg; 709 break; 710 case 'd': 711 debugging = 1; 712 break; 713 case 'e': 714 test_cmd = strdup(optarg); 715 break; 716 case 'n': 717 is_dry_run = 1; 718 break; 719 #ifdef notyet 720 case 'p': 721 passive = 1; 722 break; 723 #endif 724 case 's': 725 nap = fetchtimeout(c, NULL, optarg, 0); 726 break; 727 case 'S': 728 do_syslog = 0; 729 break; 730 case 't': 731 timeout_sec = atoi(optarg); 732 timeout = parse_timeout_to_pow2ns(c, NULL, optarg); 733 if (debugging) 734 printf("Timeout is 2^%d nanoseconds\n", 735 timeout); 736 break; 737 case 'T': 738 carp_thresh_seconds = 739 fetchtimeout(c, "NULL", optarg, 0); 740 break; 741 case 'w': 742 do_timedog = 1; 743 break; 744 case 'x': 745 exit_timeout = parse_timeout_to_pow2ns(c, NULL, optarg); 746 if (exit_timeout != 0) 747 exit_timeout |= WD_ACTIVE; 748 break; 749 case 0: 750 lopt = longopts[longindex].name; 751 if (!strcmp(lopt, "pretimeout")) { 752 pretimeout = fetchtimeout(0, lopt, optarg, 0); 753 } else if (!strcmp(lopt, "pretimeout-action")) { 754 pretimeout_act = timeout_act_str2int(lopt, 755 optarg); 756 } else if (!strcmp(lopt, "softtimeout-action")) { 757 softtimeout_act = timeout_act_str2int(lopt, 758 optarg); 759 } else { 760 /* warnx("bad option at index %d: %s", optind, 761 argv[optind]); 762 usage(); 763 */ 764 } 765 break; 766 case '?': 767 default: 768 usage(); 769 /* NOTREACHED */ 770 } 771 } 772 773 if (nap > timeout_sec / 2) 774 nap = timeout_sec / 2; 775 776 if (carp_thresh_seconds == -1) 777 carp_thresh_seconds = nap; 778 779 if (argc != optind) 780 errx(EX_USAGE, "extra arguments."); 781 if (is_daemon && timeout < WD_TO_1SEC) 782 errx(EX_USAGE, "-t argument is less than one second."); 783 if (pretimeout_set) { 784 if (pretimeout >= timeout_sec) { 785 errx(EX_USAGE, 786 "pretimeout (%d) >= timeout (%d -> %ld)\n" 787 "see manual section TIMEOUT RESOLUTION", 788 pretimeout, timeout_sec, (long)ts.tv_sec); 789 } 790 } 791 } 792