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#include <err.h>
#include <limits.h>
#include "xenctrl.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
xc_interface *h;
int id = 0;
void daemonize(void)
{
switch (fork()) {
case -1:
err(1, "fork");
case 0:
break;
default:
exit(0);
}
umask(0);
if (setsid() < 0)
err(1, "setsid");
if (chdir("/") < 0)
err(1, "chdir /");
if (freopen("/dev/null", "r", stdin) == NULL)
err(1, "reopen stdin");
if(freopen("/dev/null", "w", stdout) == NULL)
err(1, "reopen stdout");
if(freopen("/dev/null", "w", stderr) == NULL)
err(1, "reopen stderr");
}
void catch_exit(int sig)
{
if (id)
xc_watchdog(h, id, 300);
exit(0);
}
void catch_usr1(int sig)
{
if (id)
xc_watchdog(h, id, 0);
exit(0);
}
int main(int argc, char **argv)
{
int t, s;
int ret;
if (argc < 2)
errx(1, "usage: %s <timeout> <sleep>", argv[0]);
daemonize();
h = xc_interface_open(NULL, NULL, 0);
if (h == NULL)
err(1, "xc_interface_open");
t = strtoul(argv[1], NULL, 0);
if (t == ULONG_MAX)
err(1, "strtoul");
s = t / 2;
if (argc == 3) {
s = strtoul(argv[2], NULL, 0);
if (s == ULONG_MAX)
err(1, "strtoul");
}
if (signal(SIGHUP, &catch_exit) == SIG_ERR)
err(1, "signal");
if (signal(SIGINT, &catch_exit) == SIG_ERR)
err(1, "signal");
if (signal(SIGQUIT, &catch_exit) == SIG_ERR)
err(1, "signal");
if (signal(SIGTERM, &catch_exit) == SIG_ERR)
err(1, "signal");
if (signal(SIGUSR1, &catch_usr1) == SIG_ERR)
err(1, "signal");
id = xc_watchdog(h, 0, t);
if (id <= 0)
err(1, "xc_watchdog setup");
for (;;) {
sleep(s);
ret = xc_watchdog(h, id, t);
if (ret != 0)
err(1, "xc_watchdog");
}
}
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