1 /* Definitions of macros to access `dev_t' values. 2 Copyright (C) 1996, 1997, 1999, 2003, 2004, 2007, 2011 3 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21 #ifndef _SYS_SYSMACROS_H 22 #define _SYS_SYSMACROS_H 1 23 24 #include <features.h> 25 26 /* If the compiler does not know long long it is out of luck. We are 27 not going to hack weird hacks to support the dev_t representation 28 they need. */ 29 #ifdef __GLIBC_HAVE_LONG_LONG 30 __BEGIN_DECLS 31 32 __extension__ 33 extern unsigned int gnu_dev_major (unsigned long long int __dev) 34 __THROW __attribute_const__; 35 __extension__ 36 extern unsigned int gnu_dev_minor (unsigned long long int __dev) 37 __THROW __attribute_const__; 38 __extension__ 39 extern unsigned long long int gnu_dev_makedev (unsigned int __major, 40 unsigned int __minor) 41 __THROW __attribute_const__; 42 43 # if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES 44 __extension__ __extern_inline __attribute_const__ unsigned int 45 __NTH (gnu_dev_major (unsigned long long int __dev)) 46 { 47 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff); 48 } 49 50 __extension__ __extern_inline __attribute_const__ unsigned int 51 __NTH (gnu_dev_minor (unsigned long long int __dev)) 52 { 53 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff); 54 } 55 56 __extension__ __extern_inline __attribute_const__ unsigned long long int 57 __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor)) 58 { 59 return ((__minor & 0xff) | ((__major & 0xfff) << 8) 60 | (((unsigned long long int) (__minor & ~0xff)) << 12) 61 | (((unsigned long long int) (__major & ~0xfff)) << 32)); 62 } 63 # endif 64 __END_DECLS 65 66 /* Access the functions with their traditional names. */ 67 # define major(dev) gnu_dev_major (dev) 68 # define minor(dev) gnu_dev_minor (dev) 69 # define makedev(maj, min) gnu_dev_makedev (maj, min) 70 #endif 71 72 #endif /* sys/sysmacros.h */ 73
