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| 1 | /* Definitions of macros to access `dev_t' values. Hurd version. |
|---|---|
| 2 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
| 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 |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 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 */ |
| 61 |
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