1#include <unistd.h>
 2#include <sys/time.h>
 3#include "syscall.h"
 4
 5unsigned alarm(unsigned seconds)
 6{
 7	struct itimerval it = { .it_value.tv_sec = seconds }, old = { 0 };
 8	setitimer(ITIMER_REAL, &it, &old);
 9	return old.it_value.tv_sec + !!old.it_value.tv_usec;
10}