read /dev/port

main.c

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>

int main(int argc, char** argv) {
	int fd;
	off_t ret;
	ssize_t ret2;
	unsigned char buf[64];
	int i;

	fd = open("/dev/port", O_RDWR);
	if (fd < 0) {
		perror("open");
		return 1;
	}

	ret = lseek(fd, 0xe100, SEEK_SET);
	if (ret == (off_t)-1) {
		perror("lseek");
		return 1;
	}

	ret2 = read(fd, buf, sizeof(buf));
	if (ret2 < 0) {
		perror("read");
		return 1;
	}

	printf("%d: ", ret2);
	for (i=0;i<ret2;i++) {
		printf("%02x ", buf[i]);
	}
	printf("\n");

	close(fd);

	return 0;
}