| File: | src/usr.sbin/watchdogd/watchdogd.c |
| Warning: | line 93, column 2 Value stored to 'argv' is never read |
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| 1 | /* $OpenBSD: watchdogd.c,v 1.15 2015/01/16 06:40:22 deraadt Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2005 Marc Balmer <mbalmer@openbsd.org> |
| 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 USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <sys/types.h> |
| 20 | #include <sys/resource.h> |
| 21 | #include <sys/signal.h> |
| 22 | #include <sys/sysctl.h> |
| 23 | #include <sys/mman.h> |
| 24 | |
| 25 | #include <err.h> |
| 26 | #include <errno(*__errno()).h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <unistd.h> |
| 30 | |
| 31 | volatile sig_atomic_t quit = 0; |
| 32 | |
| 33 | __dead__attribute__((__noreturn__)) void usage(void); |
| 34 | void sighdlr(int); |
| 35 | int main(int, char *[]); |
| 36 | |
| 37 | __dead__attribute__((__noreturn__)) void |
| 38 | usage(void) |
| 39 | { |
| 40 | extern char *__progname; |
| 41 | |
| 42 | fprintf(stderr(&__sF[2]), "usage: %s [-dnq] [-i interval] [-p period]\n", |
| 43 | __progname); |
| 44 | exit(1); |
| 45 | } |
| 46 | |
| 47 | /* ARGSUSED */ |
| 48 | void |
| 49 | sighdlr(int signum) |
| 50 | { |
| 51 | quit = 1; |
| 52 | } |
| 53 | |
| 54 | int |
| 55 | main(int argc, char *argv[]) |
| 56 | { |
| 57 | struct rlimit rlim; |
| 58 | const char *errstr; |
| 59 | size_t len; |
| 60 | u_int interval = 0, period = 30, nperiod; |
| 61 | int ch, trigauto, sauto, speriod; |
| 62 | int quiet = 0, daemonize = 1, retval = 1, do_restore = 1; |
| 63 | int mib[3]; |
| 64 | |
| 65 | while ((ch = getopt(argc, argv, "di:np:q")) != -1) { |
| 66 | switch (ch) { |
| 67 | case 'd': |
| 68 | daemonize = 0; |
| 69 | break; |
| 70 | case 'i': |
| 71 | interval = (u_int)strtonum(optarg, 1LL, 86400LL, |
| 72 | &errstr); |
| 73 | if (errstr) |
| 74 | errx(1, "interval is %s: %s", errstr, optarg); |
| 75 | break; |
| 76 | case 'n': |
| 77 | do_restore = 0; |
| 78 | break; |
| 79 | case 'p': |
| 80 | period = (u_int)strtonum(optarg, 2LL, 86400LL, &errstr); |
| 81 | if (errstr) |
| 82 | errx(1, "period is %s: %s", errstr, optarg); |
| 83 | break; |
| 84 | case 'q': |
| 85 | quiet = 1; |
| 86 | break; |
| 87 | default: |
| 88 | usage(); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | argc -= optind; |
| 93 | argv += optind; |
Value stored to 'argv' is never read | |
| 94 | if (argc > 0) |
| 95 | usage(); |
| 96 | |
| 97 | if (interval == 0 && (interval = period / 3) == 0) |
| 98 | interval = 1; |
| 99 | |
| 100 | if (period <= interval) |
| 101 | errx(1, "retrigger interval too long"); |
| 102 | |
| 103 | /* save kern.watchdog.period and kern.watchdog.auto for restore */ |
| 104 | mib[0] = CTL_KERN1; |
| 105 | mib[1] = KERN_WATCHDOG64; |
| 106 | mib[2] = KERN_WATCHDOG_PERIOD1; |
| 107 | |
| 108 | len = sizeof(speriod); |
| 109 | if (sysctl(mib, 3, &speriod, &len, &period, sizeof(period)) == -1) { |
| 110 | if (errno(*__errno()) == EOPNOTSUPP45) |
| 111 | errx(1, "no watchdog timer available"); |
| 112 | else |
| 113 | err(1, "can't access kern.watchdog.period"); |
| 114 | } |
| 115 | |
| 116 | mib[2] = KERN_WATCHDOG_AUTO2; |
| 117 | len = sizeof(sauto); |
| 118 | trigauto = 0; |
| 119 | |
| 120 | if (sysctl(mib, 3, &sauto, &len, &trigauto, sizeof(trigauto)) == -1) |
| 121 | err(1, "can't access kern.watchdog.auto"); |
| 122 | |
| 123 | /* Double check the timeout period, some devices change the value */ |
| 124 | mib[2] = KERN_WATCHDOG_PERIOD1; |
| 125 | len = sizeof(nperiod); |
| 126 | if (sysctl(mib, 3, &nperiod, &len, NULL((void *)0), 0) == -1) { |
| 127 | warnx("can't read back kern.watchdog.period, " |
| 128 | "restoring original values"); |
| 129 | goto restore; |
| 130 | } |
| 131 | |
| 132 | if (nperiod != period && !quiet) |
| 133 | warnx("period adjusted to %d by device", nperiod); |
| 134 | |
| 135 | if (nperiod <= interval) { |
| 136 | warnx("retrigger interval %d too long, " |
| 137 | "restoring original values", interval); |
| 138 | goto restore; |
| 139 | } |
| 140 | |
| 141 | if (daemonize && daemon(0, 0)) { |
| 142 | warn("can't daemonize, restoring original values"); |
| 143 | goto restore; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * mlockall() below will wire the whole stack up to the limit |
| 148 | * thus we have to reduce stack size to avoid resource abuse |
| 149 | */ |
| 150 | rlim.rlim_cur = 256 * 1024; |
| 151 | rlim.rlim_max = 256 * 1024; |
| 152 | (void)setrlimit(RLIMIT_STACK3, &rlim); |
| 153 | |
| 154 | (void)mlockall(MCL_CURRENT0x01 | MCL_FUTURE0x02); |
| 155 | setpriority(PRIO_PROCESS0, getpid(), -5); |
| 156 | |
| 157 | signal(SIGTERM15, sighdlr); |
| 158 | |
| 159 | retval = 0; |
| 160 | while (!quit) { |
| 161 | if (sysctl(mib, 3, NULL((void *)0), 0, &period, sizeof(period)) == -1) |
| 162 | quit = retval = 1; |
| 163 | sleep(interval); |
| 164 | } |
| 165 | |
| 166 | if (do_restore) { |
| 167 | restore: sysctl(mib, 3, NULL((void *)0), 0, &speriod, sizeof(speriod)); |
| 168 | mib[2] = KERN_WATCHDOG_AUTO2; |
| 169 | sysctl(mib, 3, NULL((void *)0), 0, &sauto, sizeof(sauto)); |
| 170 | } |
| 171 | |
| 172 | return retval; |
| 173 | } |