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/*
* update.c -- periodically sync the filesystems to disk
*/
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include <signal.h>
void alarm_handler(int sig)
{
}
int main(int argc, char *argv[])
{
int i;
int interval;
struct sigaction sa;
sigset_t empty_set;
sigset_t alarm_set;
interval = (argc > 1) ? atoi(argv[1]) : 30;
if (fork() > 0)
exit(0);
chdir("/");
for (i = 0; i < OPEN_MAX; i++)
close(i);
setsid();
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sa.sa_handler = alarm_handler;
sigaction(SIGALRM, &sa, NULL);
sigemptyset(&empty_set);
sigemptyset(&alarm_set);
sigaddset(&alarm_set, SIGALRM);
sigprocmask(SIG_BLOCK, &alarm_set, NULL);
for (;;) {
alarm(interval);
sigsuspend(&empty_set);
sync();
}
}
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