mytest.c

#include<stdio.h>
#include<stdlib.h>
#include<sys/unistd.h>

#include<fcntl.h>

int main()
{
	char yourmsg[1000];

	int h=open("/dev/rwbuf", O_RDONLY);
	if(h<0)	
		printf("Error opening the device.\n");
	
	int n=read(h, yourmsg, sizeof(yourmsg));
	if(n<0)
		printf("Error reading the device.\n")

	int i;
        for(i=0; i<8; i++)
		printf("%c ", yourmsg[i]);
       
	close(h);
	return 0;
}