#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

main(){
  int pid, status, died, fd;
  fd = creat("sharedfile", 0644);
  if(fd == -1){
	fprintf(stderr,"cannot create sharedfile\n");
  	exit(2);
  }
  switch(pid = fork()){
	case -1: fprintf(stderr,"Can't fork\n");
		exit(1);
	case 0: /* child process */
		write(fd, "CCCC", 4);
		close(fd);
		exit(0);
	default: /* parent process */
		write(fd,"PPPP",4);
		close(fd);
		died = wait(&status);
  }
  exit(0);
}