| /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| #ifndef _UAPI_LINUX_STDDEF_H |
| #define _UAPI_LINUX_STDDEF_H |
| |
| #include <linux/compiler_types.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 |
| |
| /** |
| * __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 |