#ifndef _LINUX_STDDEF_H

#define _LINUX_STDDEF_H

#undef NULL

#if defined(__cplusplus)

#define NULL 0

#else

#define NULL ((void *)0)

#endif

#undef offsetof

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

/**

 * container_of - cast a member of a structure out to the containing structure

 *

 * @ptr:	the pointer to the member.

 * @type:	the type of the container struct this is embedded in.

 * @member:	the name of the member within the struct.

 *

 */

#define container_of(ptr, type, member) ({			\

        const typeof( ((type *)0)->member ) *__mptr = (ptr);	\

        (type *)( (char *)__mptr - offsetof(type,member) );})

/*

 * Check at compile time that something is of a particular type.

 * Always evaluates to 1 so you may use it easily in comparisons.

 */

#define typecheck(type,x) \

({	type __dummy; \

	typeof(x) __dummy2; \

	(void)(&__dummy == &__dummy2); \

	1; \

})

#endif