// an example of how to use memory mapping.

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>


#define BUFSIZE 80


int main(int argc, char * argv[]) {
	int i, fd, len, tmp=0,j;

	char * mptr;
	size_t size = BUFSIZE;

	char buffer[BUFSIZE];
	
	
	if((fd = open("/dev/lcd", O_RDWR)) < -1) {
		perror("file files\n");
		return 0;
	}

	
	mptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0);
	if(mptr == MAP_FAILED) {
		printf("mmap() failed\n");
		tmp = 1;
		exit(1);
	}

	memset(buffer,'\0', 80);
	sprintf(buffer,"    Hopefully it         wont blow",34);
	memcpy(mptr,buffer,34);
	write(fd,"-mmapon",7);
	// memory mapping must be turned off. otherwise no other command
	// will be recognized. since it will read from memory mapping area
	write(fd,"-mmapof",7);

	munmap(mptr, size);
	close(fd);
	
	return 0;
}