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2ef8d469 | 1 | /* Definitions of macros to access `dev_t' values. Hurd version. |
dff8da6b | 2 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
2ef8d469 ST |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
2ef8d469 ST |
18 | |
19 | #ifndef _BITS_SYSMACROS_H | |
20 | #define _BITS_SYSMACROS_H 1 | |
21 | ||
22 | #ifndef _SYS_SYSMACROS_H | |
23 | # error "Never include <bits/sysmacros.h> directly; use <sys/sysmacros.h> instead." | |
24 | #endif | |
25 | ||
26 | /* The Hurd version of dev_t in glibc is a 32-bit quantity, with 8-bit | |
27 | major and 24-bit minor numbers. The encoding is mmmmMMmm, where M is a | |
28 | hex digit of the major number and m is a hex digit of the minor number. */ | |
29 | ||
30 | #define __SYSMACROS_DECLARE_MAJOR(DECL_TEMPL) \ | |
31 | DECL_TEMPL(unsigned int, major, (__dev_t __dev)) | |
32 | ||
33 | #define __SYSMACROS_DEFINE_MAJOR(DECL_TEMPL) \ | |
34 | __SYSMACROS_DECLARE_MAJOR (DECL_TEMPL) \ | |
35 | { \ | |
36 | return ((__dev & (__dev_t) 0x0000ff00u) >> 8); \ | |
37 | } | |
38 | ||
39 | #define __SYSMACROS_DECLARE_MINOR(DECL_TEMPL) \ | |
40 | DECL_TEMPL(unsigned int, minor, (__dev_t __dev)) | |
41 | ||
42 | #define __SYSMACROS_DEFINE_MINOR(DECL_TEMPL) \ | |
43 | __SYSMACROS_DECLARE_MINOR (DECL_TEMPL) \ | |
44 | { \ | |
45 | return (__dev & (__dev_t) 0xffff00ff); \ | |
46 | } | |
47 | ||
48 | #define __SYSMACROS_DECLARE_MAKEDEV(DECL_TEMPL) \ | |
49 | DECL_TEMPL(__dev_t, makedev, (unsigned int __major, unsigned int __minor)) | |
50 | ||
51 | #define __SYSMACROS_DEFINE_MAKEDEV(DECL_TEMPL) \ | |
52 | __SYSMACROS_DECLARE_MAKEDEV (DECL_TEMPL) \ | |
53 | { \ | |
54 | __dev_t __dev; \ | |
55 | __dev = (((__dev_t) (__major & 0x000000ffu)) << 8); \ | |
56 | __dev |= (((__dev_t) (__minor & 0xffff00ffu)) << 0); \ | |
57 | return __dev; \ | |
58 | } | |
59 | ||
60 | #endif /* bits/sysmacros.h */ |