#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include <fcntl.h>
#include <sys/wait.h>

int main()
{ int p, s;

  p = fork();
  if (p == 0)
  { int t;
    srandomdev();
    t = random() % 10 + 5;
    printf("%d will wait for %d seconds\n", getpid(), t);
    sleep(t);
    printf("%d awake again\n", getpid());
    exit(0); }

  p = fork();
  if (p == 0)
  { int t;
    srandomdev();
    t = random() % 10 + 5;
    printf("%d will wait for %d seconds\n", getpid(), t);
    sleep(t);
    printf("%d awake again\n", getpid());
    exit(0); }

  p = fork();
  if (p == 0)
  { int t;
    srandomdev();
    t = random() % 10 + 5;
    printf("%d will wait for %d seconds\n", getpid(), t);
    sleep(t);
    printf("%d awake again\n", getpid());
    exit(0); }

  p = wait(& s);
  printf("%d terminated status ~ %d\n", p, s);
  p = wait(& s);
  printf("%d terminated status ~ %d\n", p, s);
  p = wait(& s);
  printf("%d terminated status ~ %d\n", p, s);

  printf("%d main thread finished\n", getpid()); }