1 /* Definitions of macros to access `dev_t' values. 2 Copyright (C) 1996-2015 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 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_SYSMACROS_H 20 #define _SYS_SYSMACROS_H 1 21 22 #include <features.h> 23 24 __BEGIN_DECLS 25 26 __extension__ 27 extern unsigned int gnu_dev_major (unsigned long long int __dev) 28 __THROW __attribute_const__; 29 __extension__ 30 extern unsigned int gnu_dev_minor (unsigned long long int __dev) 31 __THROW __attribute_const__; 32 __extension__ 33 extern unsigned long long int gnu_dev_makedev (unsigned int __major, 34 unsigned int __minor) 35 __THROW __attribute_const__; 36 37 #ifdef __USE_EXTERN_INLINES 38 __extension__ __extern_inline __attribute_const__ unsigned int 39 __NTH (gnu_dev_major (unsigned long long int __dev)) 40 { 41 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff); 42 } 43 44 __extension__ __extern_inline __attribute_const__ unsigned int 45 __NTH (gnu_dev_minor (unsigned long long int __dev)) 46 { 47 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff); 48 } 49 50 __extension__ __extern_inline __attribute_const__ unsigned long long int 51 __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor)) 52 { 53 return ((__minor & 0xff) | ((__major & 0xfff) << 8) 54 | (((unsigned long long int) (__minor & ~0xff)) << 12) 55 | (((unsigned long long int) (__major & ~0xfff)) << 32)); 56 } 57 #endif 58 __END_DECLS 59 60 /* Access the functions with their traditional names. */ 61 #define major(dev) gnu_dev_major (dev) 62 #define minor(dev) gnu_dev_minor (dev) 63 #define makedev(maj, min) gnu_dev_makedev (maj, min) 64 65 #endif /* sys/sysmacros.h */ 66