1 /* Definitions of macros to access `dev_t' values. Hurd version. 2 Copyright (C) 1996-2022 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