1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _UAPI_LINUX_TYPES_H
3#define _UAPI_LINUX_TYPES_H
4
5#include <asm/types.h>
6
7#ifndef __ASSEMBLY__
8#ifndef __KERNEL__
9#ifndef __EXPORTED_HEADERS__
10#warning "Attempt to use kernel headers from user space, see https://kernelnewbies.org/KernelHeaders"
11#endif /* __EXPORTED_HEADERS__ */
12#endif
13
14#include <linux/posix_types.h>
15
16
17/*
18 * Below are truly Linux-specific types that should never collide with
19 * any application/library that wants linux/types.h.
20 */
21
22/* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */
23#ifdef __CHECKER__
24#define __bitwise __attribute__((bitwise))
25#else
26#define __bitwise
27#endif
28
29/* The kernel doesn't use this legacy form, but user space does */
30#define __bitwise__ __bitwise
31
32typedef __u16 __bitwise __le16;
33typedef __u16 __bitwise __be16;
34typedef __u32 __bitwise __le32;
35typedef __u32 __bitwise __be32;
36typedef __u64 __bitwise __le64;
37typedef __u64 __bitwise __be64;
38
39typedef __u16 __bitwise __sum16;
40typedef __u32 __bitwise __wsum;
41
42/*
43 * aligned_u64 should be used in defining kernel<->userspace ABIs to avoid
44 * common 32/64-bit compat problems.
45 * 64-bit values align to 4-byte boundaries on x86_32 (and possibly other
46 * architectures) and to 8-byte boundaries on 64-bit architectures. The new
47 * aligned_64 type enforces 8-byte alignment so that structs containing
48 * aligned_64 values have the same alignment on 32-bit and 64-bit architectures.
49 * No conversions are necessary between 32-bit user-space and a 64-bit kernel.
50 */
51#define __aligned_u64 __u64 __attribute__((aligned(8)))
52#define __aligned_be64 __be64 __attribute__((aligned(8)))
53#define __aligned_le64 __le64 __attribute__((aligned(8)))
54
55typedef unsigned __bitwise __poll_t;
56
57#endif /* __ASSEMBLY__ */
58#endif /* _UAPI_LINUX_TYPES_H */
59

source code of linux/include/uapi/linux/types.h