sysdeps/unix/sysv/linux/sys/sysmacros.h

   1 /* Definitions of macros to access `dev_t' values.
   2    Copyright (C) 1996-2014 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 */