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/* Definitions of macros to access `dev_t' values. Copyright (C) 1996, 1997, 1999, 2003, 2004, 2007, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _SYS_SYSMACROS_H #define _SYS_SYSMACROS_H 1 #include <features.h> /* If the compiler does not know long long it is out of luck. We are not going to hack weird hacks to support the dev_t representation they need. */ #ifdef __GLIBC_HAVE_LONG_LONG __BEGIN_DECLS __extension__ extern unsigned int gnu_dev_major (unsigned long long int __dev) __THROW __attribute_const__; __extension__ extern unsigned int gnu_dev_minor (unsigned long long int __dev) __THROW __attribute_const__; __extension__ extern unsigned long long int gnu_dev_makedev (unsigned int __major, unsigned int __minor) __THROW __attribute_const__; # if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES __extension__ __extern_inline __attribute_const__ unsigned int __NTH (gnu_dev_major (unsigned long long int __dev)) { return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff); } __extension__ __extern_inline __attribute_const__ unsigned int __NTH (gnu_dev_minor (unsigned long long int __dev)) { return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff); } __extension__ __extern_inline __attribute_const__ unsigned long long int __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor)) { return ((__minor & 0xff) | ((__major & 0xfff) << 8) | (((unsigned long long int) (__minor & ~0xff)) << 12) | (((unsigned long long int) (__major & ~0xfff)) << 32)); } # endif __END_DECLS /* Access the functions with their traditional names. */ # define major(dev) gnu_dev_major (dev) # define minor(dev) gnu_dev_minor (dev) # define makedev(maj, min) gnu_dev_makedev (maj, min) #endif #endif /* sys/sysmacros.h */