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1 /* Definitions of macros to access `dev_t' values. Hurd version.
2 Copyright (C) 1996-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #ifndef _BITS_SYSMACROS_H
20 #define _BITS_SYSMACROS_H 1
22 #ifndef _SYS_SYSMACROS_H
23 # error "Never include <bits/sysmacros.h> directly; use <sys/sysmacros.h> instead."
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. */
30 #define __SYSMACROS_DECLARE_MAJOR(DECL_TEMPL) \
31 DECL_TEMPL(unsigned int, major, (__dev_t __dev))
33 #define __SYSMACROS_DEFINE_MAJOR(DECL_TEMPL) \
34 __SYSMACROS_DECLARE_MAJOR (DECL_TEMPL) \
36 return ((__dev & (__dev_t) 0x0000ff00u) >> 8); \
39 #define __SYSMACROS_DECLARE_MINOR(DECL_TEMPL) \
40 DECL_TEMPL(unsigned int, minor, (__dev_t __dev))
42 #define __SYSMACROS_DEFINE_MINOR(DECL_TEMPL) \
43 __SYSMACROS_DECLARE_MINOR (DECL_TEMPL) \
45 return (__dev & (__dev_t) 0xffff00ff); \
48 #define __SYSMACROS_DECLARE_MAKEDEV(DECL_TEMPL) \
49 DECL_TEMPL(__dev_t, makedev, (unsigned int __major, unsigned int __minor))
51 #define __SYSMACROS_DEFINE_MAKEDEV(DECL_TEMPL) \
52 __SYSMACROS_DECLARE_MAKEDEV (DECL_TEMPL) \
55 __dev = (((__dev_t) (__major & 0x000000ffu)) << 8); \
56 __dev |= (((__dev_t) (__minor & 0xffff00ffu)) << 0); \
60 #endif /* bits/sysmacros.h */