#include <stdio.h>
#include <stdlib.h>

main(int argc, char* argv[])
{
  int pid ;

  if( (pid=fork()) == 0) {
    fprintf(stderr, "I'm the child, my pid is %d\n", getpid());
  } else {
    wait(NULL);
    fprintf(stderr, "I'm the parent, my pid is %d\n", getpid());
  }

  fprintf(stderr, "I'm %d. My parent is %d\n", getpid(), getppid());
}