#include <stdio.h>
#include <unistd.h>
#define __USE_GNU
#include <fcntl.h>
#include <stdlib.h>

#define BS		(131072)
#define BLOCKS		(4096)
#define ALIGN(buf)	(char *) (((unsigned long) (buf) + 4095) & ~(4095))

int main(int argc, char *argv[])
{
	char *buffer;
	int fd, i;

	if (argc < 2) {
		printf("%s: <device>\n", argv[0]);
		return 1;
	}

	fd = open(argv[1], O_RDONLY | O_DIRECT);
	if (fd == -1) {
		perror("open");
		return 2;
	}

	buffer = ALIGN(malloc(BS + 4095));

	for (i = 0; i < BLOCKS; i++) {
		int ret = read(fd, buffer, BS);

		if (!ret)
			break;
		else if (ret < 0) {
			perror("read infile");
			break;
		}
	}

	return 0;
}