#include <signal.h>
#include <time.h>
#include <unistd.h>

_syscall0(time_t, time);

_syscall1(int, alarm, unsigned int, seconds);

static void sleepsig(int sig) {}

void sleep(time_t t) {
  signal(SIGALRM, &sleepsig);
  alarm(t);
  pause();
}