mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
#ifndef _UAPI_LINUX_STDDEF_H
|
|
#define _UAPI_LINUX_STDDEF_H
|
|
|
|
#ifndef __always_inline
|
|
#define __always_inline inline
|
|
#endif
|
|
|
|
/**
|
|
* __struct_group() - Create a mirrored named and anonyomous struct
|
|
*
|
|
* @TAG: The tag name for the named sub-struct (usually empty)
|
|
* @NAME: The identifier name of the mirrored sub-struct
|
|
* @ATTRS: Any struct attributes (usually empty)
|
|
* @MEMBERS: The member declarations for the mirrored structs
|
|
*
|
|
* Used to create an anonymous union of two structs with identical layout
|
|
* and size: one anonymous and one named. The former's members can be used
|
|
* normally without sub-struct naming, and the latter can be used to
|
|
* reason about the start, end, and size of the group of struct members.
|
|
* The named struct can also be explicitly tagged for layer reuse, as well
|
|
* as both having struct attributes appended.
|
|
*/
|
|
#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
|
|
union { \
|
|
struct { MEMBERS } ATTRS; \
|
|
struct TAG { MEMBERS } ATTRS NAME; \
|
|
} ATTRS
|
|
|
|
#ifdef __cplusplus
|
|
/* sizeof(struct{}) is 1 in C++, not 0, can't use C version of the macro. */
|
|
#define __DECLARE_FLEX_ARRAY(T, member) \
|
|
T member[0]
|
|
#else
|
|
/**
|
|
* __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
|
|
*
|
|
* @TYPE: The type of each flexible array element
|
|
* @NAME: The name of the flexible array member
|
|
*
|
|
* In order to have a flexible array member in a union or alone in a
|
|
* struct, it needs to be wrapped in an anonymous struct with at least 1
|
|
* named member, but that member can be empty.
|
|
*/
|
|
#define __DECLARE_FLEX_ARRAY(TYPE, NAME) \
|
|
struct { \
|
|
struct { } __empty_ ## NAME; \
|
|
TYPE NAME[]; \
|
|
}
|
|
#endif
|
|
|
|
#ifndef __counted_by
|
|
#define __counted_by(m)
|
|
#endif
|
|
|
|
#endif /* _UAPI_LINUX_STDDEF_H */
|