stddef.h File Reference

#include <_types/_ptrdiff_t.h>
#include <_types/_size_t.h>

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Macros
#define	NULL   ((void*)0)
#define	offsetof(type, member)   ((size_t)((char*)&(((type*)0)->member) - (char*)0))

Macro Definition Documentation

NULL

#define NULL   ((void*)0)

Expands to ((void*)0) (not C++). Implementation-defined null pointer constant

Definition at line 15 of file stddef.h.

offsetof

#define offsetof	(		type,
			member
	)		((size_t)((char*)&(((type*)0)->member) - (char*)0))

byte offset from the beginning of a struct type to specified member

Definition at line 27 of file stddef.h.