#include <stdio.h>
#include <signal.h>
#include <sys/time.h>
int main(int argc, char *argv[])
{
sigset_t block;
struct itimerval itv;
sigemptyset(&block);
sigaddset(&block, SIGALRM);
sigprocmask(SIG_BLOCK, &block, NULL);
itv.it_interval.tv_sec = 2;
itv.it_interval.tv_usec = 0;
itv.it_value = itv.it_interval;
setitimer(ITIMER_REAL, &itv, NULL);
while (1) {
printf("%d\n", time(NULL));
sigwaitinfo(&block, NULL);
}
return 0;
}
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