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

int main()
{
	int fd;
	char c;

	fd = open("/dev/hello0", O_RDWR);

	if (fd <0)
	{
		perror("open");
		return fd;
	}

	while (read(fd, &c, 1))
		putchar(c);
	close(fd);

	return 0;
}