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

int f1,f2,i=-1;
char *c;

int main(int argc,char *argv[])
{
	f1=open(argv[1],O_RDONLY);
	f2=open(argv[2],O_WRONLY);
	printf("%d %d\n",f1,f2);

	if (f1>=0)
	{
		lseek(f1,i,2);
		while (read(f1,&c,1))
		{
			write(f2,&c,1);
			--i;
			if (lseek(f1,i,2)==-1)
				break;
		}
	}

	close(f1);
	close(f2);
	ulink(argv[1]);
	link(argv[2],argv[1]);
	ulink(argv[2]);

	printf("OK\n");
	return 0;
}