1/* Definitions of macros to access `dev_t' values. 2 Copyright (C) 1996, 1997, 1999, 2003, 2004 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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20#ifndef _SYS_SYSMACROS_H 21#define _SYS_SYSMACROS_H 1 22 23#include <features.h> 24 25/* If the compiler does not know long long it is out of luck. We are 26 not going to hack weird hacks to support the dev_t representation 27 they need. */ 28#if 1 /*def __GLIBC_HAVE_LONG_LONG uClibc note: always enable */ 29__extension__ 30static __inline unsigned int gnu_dev_major (unsigned long long int __dev) 31 __THROW; 32__extension__ 33static __inline unsigned int gnu_dev_minor (unsigned long long int __dev) 34 __THROW; 35__extension__ 36static __inline unsigned long long int gnu_dev_makedev (unsigned int __major, 37 unsigned int __minor) 38 __THROW; 39 40# if defined __GNUC__ && __GNUC__ >= 2 41__extension__ static __inline unsigned int 42__NTH (gnu_dev_major (unsigned long long int __dev)) 43{ 44 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff); 45} 46 47__extension__ static __inline unsigned int 48__NTH (gnu_dev_minor (unsigned long long int __dev)) 49{ 50 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff); 51} 52 53__extension__ static __inline unsigned long long int 54__NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor)) 55{ 56 return ((__minor & 0xff) | ((__major & 0xfff) << 8) 57 | (((unsigned long long int) (__minor & ~0xff)) << 12) 58 | (((unsigned long long int) (__major & ~0xfff)) << 32)); 59} 60# endif 61 62 63/* Access the functions with their traditional names. */ 64# define major(dev) gnu_dev_major (dev) 65# define minor(dev) gnu_dev_minor (dev) 66# define makedev(maj, min) gnu_dev_makedev (maj, min) 67#endif 68 69#endif /* sys/sysmacros.h */ 70