LINUX设备驱动程序第二版配套源码

				/*				 * import.c -- a module using a symbol from export.c				 *				 *********/								#ifndef __KERNEL__				#  define __KERNEL__				#endif				#ifndef MODULE				#  define MODULE				#endif								/*				 * Use versioning if needed				 */				#include  /* retrieve the CONFIG_* macros */				#ifdef CONFIG_MODVERSIONS				#   undef MODVERSIONS /* it might be defined */				#   define MODVERSIONS				#endif								#ifdef MODVERSIONS				#  include 				#  include "export.ver"				#endif												#include 				#include 				#include "sysdep.h"								extern int export_function(int, int);								int import_init(void)				{				    int i = export_function(2,2);				    printk("import: my mate tells that 2+2 = %i\n",i);				    return 0;				}								void import_cleanup(void)				{}								module_init(import_init);				module_exit(import_cleanup);