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✏️ stddef.h

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _LINUX_STDDEF_H
#define _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; \
	}

#endif

/*
 * __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[]; \
	}

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✏️ stddef.h