2003-06-26 09:50:52 +00:00
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/*
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* Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Software watchdog daemon.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/rtprio.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <signal.h>
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static void parseargs(int, char *[]);
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static void sighandler(int);
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static void watchdog_loop(void);
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static int watchdog_init(void);
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static int watchdog_onoff(int onoff);
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static int watchdog_tickle(void);
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static void usage(void);
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int debugging = 0;
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int end_program = 0;
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const char *pidfile = _PATH_VARRUN "watchdogd.pid";
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int reset_mib[3];
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2003-06-26 18:36:57 +00:00
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size_t reset_miblen = 3;
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2003-06-26 09:50:52 +00:00
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/*
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* Periodically write to the debug.watchdog.reset sysctl OID
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* to keep the software watchdog from firing.
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*/
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int
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main(int argc, char *argv[])
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{
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struct rtprio rtp;
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FILE *fp;
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if (getuid() != 0)
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errx(EX_SOFTWARE, "not super user");
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parseargs(argc, argv);
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rtp.type = RTP_PRIO_REALTIME;
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rtp.prio = 0;
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if (rtprio(RTP_SET, 0, &rtp) == -1)
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err(EX_OSERR, "rtprio");
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if (watchdog_init() == -1)
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exit(EX_SOFTWARE);
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if (watchdog_onoff(1) == -1)
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exit(EX_SOFTWARE);
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if (debugging == 0 && daemon(0, 0) == -1) {
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watchdog_onoff(0);
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err(EX_OSERR, "daemon");
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}
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signal(SIGHUP, SIG_IGN);
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signal(SIGINT, sighandler);
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signal(SIGTERM, sighandler);
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fp = fopen(pidfile, "w");
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if (fp != NULL) {
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fprintf(fp, "%d\n", getpid());
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fclose(fp);
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}
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watchdog_loop();
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/* exiting */
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watchdog_onoff(0);
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unlink(pidfile);
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return (EX_OK);
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}
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/*
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* Catch signals and begin shutdown process.
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*/
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static void
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sighandler(int signum)
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{
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if (signum == SIGINT || signum == SIGTERM)
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end_program = 1;
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}
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/*
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* Locate the OID for the 'debug.watchdog.reset' sysctl setting.
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* Upon finding it, do an initial reset on the watchdog.
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*/
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static int
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watchdog_init()
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{
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int error;
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error = sysctlnametomib("debug.watchdog.reset", reset_mib,
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&reset_miblen);
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if (error == -1) {
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fprintf(stderr, "Could not find reset OID: %s\n",
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strerror(errno));
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return (error);
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}
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return watchdog_tickle();
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}
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/*
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* Main program loop which is iterated every second.
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*/
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static void
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watchdog_loop(void)
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{
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struct stat sb;
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int failed;
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while (end_program == 0) {
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failed = 0;
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failed = stat("/etc", &sb);
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if (failed == 0)
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watchdog_tickle();
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sleep(1);
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}
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}
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/*
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* Reset the watchdog timer. This function must be called periodically
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* to keep the watchdog from firing.
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*/
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int
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watchdog_tickle(void)
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{
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return sysctl(reset_mib, reset_miblen, NULL, NULL, NULL, 0);
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}
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/*
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* Toggle the kernel's watchdog. This routine is used to enable and
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* disable the watchdog.
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*/
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static int
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watchdog_onoff(int onoff)
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{
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2003-06-26 11:24:10 +00:00
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int mib[3];
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int error;
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2003-06-26 18:36:57 +00:00
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size_t len;
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2003-06-26 09:50:52 +00:00
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len = 3;
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error = sysctlnametomib("debug.watchdog.enabled", mib, &len);
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if (error == 0)
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error = sysctl(mib, len, NULL, NULL, &onoff, sizeof(onoff));
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if (error == -1) {
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fprintf(stderr, "Could not %s watchdog: %s\n",
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(onoff > 0) ? "enable" : "disable",
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strerror(errno));
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return (error);
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}
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return (0);
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}
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/*
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* Tell user how to use the program.
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*/
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static void
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usage()
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{
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fprintf(stderr, "usage: watchdogd [-d] [-I file]\n");
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exit(EX_USAGE);
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}
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/*
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* Handle the few command line arguments supported.
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*/
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static void
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parseargs(int argc, char *argv[])
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{
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int c;
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while ((c = getopt(argc, argv, "I:d?")) != -1) {
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switch (c) {
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case 'I':
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pidfile = optarg;
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break;
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case 'd':
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debugging = 1;
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break;
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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}
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}
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