#include <stdio.h>
#include <fcntl.h>

#define ERROR -1

main()
{
	int i,fd1,fd2,status;
        if ((fd1=open("ff",O_WRONLY|O_CREAT,0777))== -1)
              {printf("ERROR\n"); exit(1);}
              printf("%d\n",fd1);
        fd2=dup(fd1);
              printf("%d\n",fd2);
   if ( fork()==0 )  {
        write(fd1,"HELLO CHILD\n",12);exit(0);}
   else {
        wait(&status);
        write(fd2,"HELLO PARENT\n",13);}
write(fd1,"COMMON PART\n",12); 

}