1c5c0fdbeSDavid 'Digit' Turner /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2c5c0fdbeSDavid 'Digit' Turner #ifndef _LINUX_STDDEF_H 3c5c0fdbeSDavid 'Digit' Turner #define _LINUX_STDDEF_H 4c5c0fdbeSDavid 'Digit' Turner 5c5c0fdbeSDavid 'Digit' Turner 6c5c0fdbeSDavid 'Digit' Turner 7c5c0fdbeSDavid 'Digit' Turner #ifndef __always_inline 8c5c0fdbeSDavid 'Digit' Turner #define __always_inline __inline__ 9c5c0fdbeSDavid 'Digit' Turner #endif 10c5c0fdbeSDavid 'Digit' Turner 11421ee1ecSDaniel Henrique Barboza /* Not all C++ standards support type declarations inside an anonymous union */ 12421ee1ecSDaniel Henrique Barboza #ifndef __cplusplus 13421ee1ecSDaniel Henrique Barboza #define __struct_group_tag(TAG) TAG 14421ee1ecSDaniel Henrique Barboza #else 15421ee1ecSDaniel Henrique Barboza #define __struct_group_tag(TAG) 16421ee1ecSDaniel Henrique Barboza #endif 17421ee1ecSDaniel Henrique Barboza 18c5c0fdbeSDavid 'Digit' Turner /** 19c5c0fdbeSDavid 'Digit' Turner * __struct_group() - Create a mirrored named and anonyomous struct 20c5c0fdbeSDavid 'Digit' Turner * 21c5c0fdbeSDavid 'Digit' Turner * @TAG: The tag name for the named sub-struct (usually empty) 22c5c0fdbeSDavid 'Digit' Turner * @NAME: The identifier name of the mirrored sub-struct 23c5c0fdbeSDavid 'Digit' Turner * @ATTRS: Any struct attributes (usually empty) 24c5c0fdbeSDavid 'Digit' Turner * @MEMBERS: The member declarations for the mirrored structs 25c5c0fdbeSDavid 'Digit' Turner * 26c5c0fdbeSDavid 'Digit' Turner * Used to create an anonymous union of two structs with identical layout 27c5c0fdbeSDavid 'Digit' Turner * and size: one anonymous and one named. The former's members can be used 28c5c0fdbeSDavid 'Digit' Turner * normally without sub-struct naming, and the latter can be used to 29c5c0fdbeSDavid 'Digit' Turner * reason about the start, end, and size of the group of struct members. 30421ee1ecSDaniel Henrique Barboza * The named struct can also be explicitly tagged for layer reuse (C only), 31421ee1ecSDaniel Henrique Barboza * as well as both having struct attributes appended. 32c5c0fdbeSDavid 'Digit' Turner */ 33c5c0fdbeSDavid 'Digit' Turner #define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \ 34c5c0fdbeSDavid 'Digit' Turner union { \ 35c5c0fdbeSDavid 'Digit' Turner struct { MEMBERS } ATTRS; \ 36421ee1ecSDaniel Henrique Barboza struct __struct_group_tag(TAG) { MEMBERS } ATTRS NAME; \ 37efb91426SDaniel Henrique Barboza } ATTRS 38c5c0fdbeSDavid 'Digit' Turner 39efb91426SDaniel Henrique Barboza #ifdef __cplusplus 40efb91426SDaniel Henrique Barboza /* sizeof(struct{}) is 1 in C++, not 0, can't use C version of the macro. */ 41efb91426SDaniel Henrique Barboza #define __DECLARE_FLEX_ARRAY(T, member) \ 42efb91426SDaniel Henrique Barboza T member[0] 43efb91426SDaniel Henrique Barboza #else 44c5c0fdbeSDavid 'Digit' Turner /** 45c5c0fdbeSDavid 'Digit' Turner * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union 46c5c0fdbeSDavid 'Digit' Turner * 47c5c0fdbeSDavid 'Digit' Turner * @TYPE: The type of each flexible array element 48c5c0fdbeSDavid 'Digit' Turner * @NAME: The name of the flexible array member 49c5c0fdbeSDavid 'Digit' Turner * 50c5c0fdbeSDavid 'Digit' Turner * In order to have a flexible array member in a union or alone in a 51c5c0fdbeSDavid 'Digit' Turner * struct, it needs to be wrapped in an anonymous struct with at least 1 52c5c0fdbeSDavid 'Digit' Turner * named member, but that member can be empty. 53c5c0fdbeSDavid 'Digit' Turner */ 54c5c0fdbeSDavid 'Digit' Turner #define __DECLARE_FLEX_ARRAY(TYPE, NAME) \ 55c5c0fdbeSDavid 'Digit' Turner struct { \ 56c5c0fdbeSDavid 'Digit' Turner struct { } __empty_ ## NAME; \ 57c5c0fdbeSDavid 'Digit' Turner TYPE NAME[]; \ 58c5c0fdbeSDavid 'Digit' Turner } 59c5c0fdbeSDavid 'Digit' Turner #endif 60da3c22c7SThomas Huth 61da3c22c7SThomas Huth #ifndef __counted_by 62da3c22c7SThomas Huth #define __counted_by(m) 63da3c22c7SThomas Huth #endif 64efb91426SDaniel Henrique Barboza 65c5614ee3SThomas Weißschuh #ifndef __counted_by_le 66c5614ee3SThomas Weißschuh #define __counted_by_le(m) 67c5614ee3SThomas Weißschuh #endif 68c5614ee3SThomas Weißschuh 69c5614ee3SThomas Weißschuh #ifndef __counted_by_be 70c5614ee3SThomas Weißschuh #define __counted_by_be(m) 71c5614ee3SThomas Weißschuh #endif 72c5614ee3SThomas Weißschuh 73*1cab5a02SRorie Reyes #define __kernel_nonstring 74*1cab5a02SRorie Reyes 75efb91426SDaniel Henrique Barboza #endif /* _LINUX_STDDEF_H */ 76