1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux 1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI_LINUX_STDDEF_H <<
3 #define _UAPI_LINUX_STDDEF_H <<
4 <<
5 #include <linux/compiler_types.h> 2 #include <linux/compiler_types.h>
6 3
7 #ifndef __always_inline 4 #ifndef __always_inline
8 #define __always_inline inline 5 #define __always_inline inline
9 #endif 6 #endif
10 7
11 /** 8 /**
12 * __struct_group() - Create a mirrored named 9 * __struct_group() - Create a mirrored named and anonyomous struct
13 * 10 *
14 * @TAG: The tag name for the named sub-struct 11 * @TAG: The tag name for the named sub-struct (usually empty)
15 * @NAME: The identifier name of the mirrored 12 * @NAME: The identifier name of the mirrored sub-struct
16 * @ATTRS: Any struct attributes (usually empt 13 * @ATTRS: Any struct attributes (usually empty)
17 * @MEMBERS: The member declarations for the m 14 * @MEMBERS: The member declarations for the mirrored structs
18 * 15 *
19 * Used to create an anonymous union of two st 16 * Used to create an anonymous union of two structs with identical layout
20 * and size: one anonymous and one named. The 17 * and size: one anonymous and one named. The former's members can be used
21 * normally without sub-struct naming, and the 18 * normally without sub-struct naming, and the latter can be used to
22 * reason about the start, end, and size of th 19 * reason about the start, end, and size of the group of struct members.
23 * The named struct can also be explicitly tag 20 * The named struct can also be explicitly tagged for layer reuse, as well
24 * as both having struct attributes appended. 21 * as both having struct attributes appended.
25 */ 22 */
26 #define __struct_group(TAG, NAME, ATTRS, MEMBE 23 #define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
27 union { \ 24 union { \
28 struct { MEMBERS } ATTRS; \ 25 struct { MEMBERS } ATTRS; \
29 struct TAG { MEMBERS } ATTRS N 26 struct TAG { MEMBERS } ATTRS NAME; \
30 } ATTRS !! 27 }
31 28
32 #ifdef __cplusplus <<
33 /* sizeof(struct{}) is 1 in C++, not 0, can't <<
34 #define __DECLARE_FLEX_ARRAY(T, member) \ <<
35 T member[0] <<
36 #else <<
37 /** 29 /**
38 * __DECLARE_FLEX_ARRAY() - Declare a flexible 30 * __DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
39 * 31 *
40 * @TYPE: The type of each flexible array elem 32 * @TYPE: The type of each flexible array element
41 * @NAME: The name of the flexible array membe 33 * @NAME: The name of the flexible array member
42 * 34 *
43 * In order to have a flexible array member in 35 * In order to have a flexible array member in a union or alone in a
44 * struct, it needs to be wrapped in an anonym 36 * struct, it needs to be wrapped in an anonymous struct with at least 1
45 * named member, but that member can be empty. 37 * named member, but that member can be empty.
46 */ 38 */
47 #define __DECLARE_FLEX_ARRAY(TYPE, NAME) 39 #define __DECLARE_FLEX_ARRAY(TYPE, NAME) \
48 struct { \ 40 struct { \
49 struct { } __empty_ ## NAME; \ 41 struct { } __empty_ ## NAME; \
50 TYPE NAME[]; \ 42 TYPE NAME[]; \
51 } 43 }
52 #endif <<
53 <<
54 #ifndef __counted_by <<
55 #define __counted_by(m) <<
56 #endif <<
57 <<
58 #ifndef __counted_by_le <<
59 #define __counted_by_le(m) <<
60 #endif <<
61 <<
62 #ifndef __counted_by_be <<
63 #define __counted_by_be(m) <<
64 #endif <<
65 <<
66 #endif /* _UAPI_LINUX_STDDEF_H */ <<
67 44
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