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

char buffer[16];

int main()
{
	int fd=open("aa", O_RDONLY);
	int i;
	for(i=5;i>0;i--)
	{
		read(fd,buffer,i);
		write(1,buffer,i);
	}
	return 0;
}