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96 lines
3.2 KiB
96 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_STDDEF_H |
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#define _LINUX_STDDEF_H |
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#include <uapi/linux/stddef.h> |
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#undef NULL |
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#define NULL ((void *)0) |
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enum { |
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false = 0, |
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true = 1 |
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}; |
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#undef offsetof |
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#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER) |
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/** |
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* sizeof_field() - Report the size of a struct field in bytes |
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* |
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* @TYPE: The structure containing the field of interest |
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* @MEMBER: The field to return the size of |
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*/ |
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#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) |
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/** |
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* offsetofend() - Report the offset of a struct field within the struct |
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* |
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* @TYPE: The type of the structure |
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* @MEMBER: The member within the structure to get the end offset of |
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*/ |
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#define offsetofend(TYPE, MEMBER) \ |
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(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) |
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/** |
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* struct_group() - Wrap a set of declarations in a mirrored struct |
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* |
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* @NAME: The identifier name of the mirrored sub-struct |
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* @MEMBERS: The member declarations for the mirrored structs |
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* |
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* Used to create an anonymous union of two structs with identical |
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* layout and size: one anonymous and one named. The former can be |
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* used normally without sub-struct naming, and the latter can be |
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* used to reason about the start, end, and size of the group of |
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* struct members. |
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*/ |
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#define struct_group(NAME, MEMBERS...) \ |
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__struct_group(/* no tag */, NAME, /* no attrs */, MEMBERS) |
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/** |
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* struct_group_attr() - Create a struct_group() with trailing attributes |
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* |
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* @NAME: The identifier name of the mirrored sub-struct |
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* @ATTRS: Any struct attributes to apply |
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* @MEMBERS: The member declarations for the mirrored structs |
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* |
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* Used to create an anonymous union of two structs with identical |
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* layout and size: one anonymous and one named. The former can be |
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* used normally without sub-struct naming, and the latter can be |
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* used to reason about the start, end, and size of the group of |
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* struct members. Includes structure attributes argument. |
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*/ |
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#define struct_group_attr(NAME, ATTRS, MEMBERS...) \ |
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__struct_group(/* no tag */, NAME, ATTRS, MEMBERS) |
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/** |
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* struct_group_tagged() - Create a struct_group with a reusable tag |
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* |
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* @TAG: The tag name for the named sub-struct |
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* @NAME: The identifier name of the mirrored sub-struct |
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* @MEMBERS: The member declarations for the mirrored structs |
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* |
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* Used to create an anonymous union of two structs with identical |
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* layout and size: one anonymous and one named. The former can be |
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* used normally without sub-struct naming, and the latter can be |
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* used to reason about the start, end, and size of the group of |
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* struct members. Includes struct tag argument for the named copy, |
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* so the specified layout can be reused later. |
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*/ |
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#define struct_group_tagged(TAG, NAME, MEMBERS...) \ |
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__struct_group(TAG, NAME, /* no attrs */, MEMBERS) |
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/** |
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* DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union |
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* |
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* @TYPE: The type of each flexible array element |
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* @NAME: The name of the flexible array member |
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* |
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* In order to have a flexible array member in a union or alone in a |
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* struct, it needs to be wrapped in an anonymous struct with at least 1 |
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* named member, but that member can be empty. |
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*/ |
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#define DECLARE_FLEX_ARRAY(TYPE, NAME) \ |
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__DECLARE_FLEX_ARRAY(TYPE, NAME) |
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#endif
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