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TOMOYO Linux Cross Reference
Linux/include/linux/stddef.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_STDDEF_H
  3 #define _LINUX_STDDEF_H
  4 
  5 #include <uapi/linux/stddef.h>
  6 
  7 #undef NULL
  8 #define NULL ((void *)0)
  9 
 10 enum {
 11         false   = 0,
 12         true    = 1
 13 };
 14 
 15 #undef offsetof
 16 #ifdef __compiler_offsetof
 17 #define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)
 18 #else
 19 #define offsetof(TYPE, MEMBER)  ((size_t)&((TYPE *)0)->MEMBER)
 20 #endif
 21 
 22 /**
 23  * sizeof_field(TYPE, MEMBER)
 24  *
 25  * @TYPE: The structure containing the field of interest
 26  * @MEMBER: The field to return the size of
 27  */
 28 #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
 29 
 30 /**
 31  * offsetofend(TYPE, MEMBER)
 32  *
 33  * @TYPE: The type of the structure
 34  * @MEMBER: The member within the structure to get the end offset of
 35  */
 36 #define offsetofend(TYPE, MEMBER) \
 37         (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
 38 
 39 #endif
 40 

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