u.c

很好的mmap（）驱动函数的it is a good driver for mmap func

#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>

int global=0;
void hello(void)
{	
	printf("unsigned long=%d\n",sizeof(unsigned long));
	printf("hello\n");
	global=145;
	printf("global=%d\n",global);
}