#include <stdio.h>
#include <unistd.h>

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

  pid_t pid;

  pid = fork();

  if (pid < 0)
    printf("Error on fork");
  else if (pid == 0)
    printf("Child process. \n");
  else
    printf("Parent process. \n");

return 0;
}