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