#ifndef _LINUX_STDDEF_H #define _LINUX_STDDEF_H #undef NULL #if defined(__cplusplus) #define NULL 0 #else #define NULL ((void *)0) #endif #ifndef _SIZE_T #include <linux/types.h> #endif #undef offsetof #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) #endif