LXR linux/include/linux/stddef.h

   1#ifndef _LINUX_STDDEF_H
   2#define _LINUX_STDDEF_H
   3
   4#include <linux/compiler.h>
   5
   6#undef NULL
   7#if defined(__cplusplus)
   8#define NULL 0
   9#else
  10#define NULL ((void *)0)
  11#endif
  12
  13#undef offsetof
  14#ifdef __compiler_offsetof
  15#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
  16#else
  17#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  18#endif
  19
  20#endif
  21