#include<unistd.h>
#include<sys/mman.h>
#include<fcntl.h>
#include<sys/types.h>
#include<stdlib.h>
#include<errno.h>
#include<sys/ioctl.h>

#define	 CHAR_IOCTL	0x1a
#define	I_CHAR_MMAP	_IOWR(CHAR_IOCTL, 1,1024)	

main()
{
	int fd=0;
    unsigned long buffer;
	char *buf;
	int rc=0;
	char towrite;
	fd = open("/dev/simplechar",O_RDWR);
	if(fd <0){
		perror("Open failed");
		return;
	}
	printf("buffer ptr:%p\n", buffer);	
	rc = ioctl (fd, I_CHAR_MMAP,&buffer);
	if(rc ) {
		perror("mmap");
		return;
	}
	printf("buffer pointr:%p\n",buffer);

	printf(" buffer is:%s\n", (char *)buffer);
  // strcpy((char*)buffer,"hi meri");	
	
	
}