File: | src/usr.sbin/watchdogd/watchdogd.c |
Warning: | line 93, column 2 Value stored to 'argv' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
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 | } |