#include <stdio.h>   /*printf*/
#include <sys/uio.h> /*readv. iovec*/
#include <fcntl.h>   /*O_RDWR, open*/
#include <unistd.h>  /*close*/

int main()
{

	int test_fd, bytes_read, i;
	struct iovec iov[2];
	char arr0[5];
	char arr1[20];

	//for clarity, fill buffers with 'X's
	for(i=0;i<20;i++)
		arr1[i]='X';

	for(i=0;i<5;i++)
		arr0[i]='X';

	iov[0].iov_len = 5;
	iov[0].iov_base = arr0;
	iov[1].iov_len = 20;
	iov[1].iov_base = arr1;

	test_fd = open("testfile.foo",O_RDWR);

	bytes_read = readv(test_fd, iov, 2);

	printf("Total Bytes: %d\n",bytes_read);

	printf("Vectors:\n\t");
	for(i=0;i<(bytes_read<5?bytes_read:5);i++)
		printf("%c",arr0[i]);
	printf("\n\t");
	bytes_read -= 5;
	for(i=0;i<bytes_read;i++)
		printf("%c",arr1[i]);
	printf("\n");

	close(test_fd);

	return 0;
}