tools/include/sys/sysmacros.h

   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 static inline unsigned int
  24 __gnu_dev_major(unsigned long long int __dev)
  25 {
  26   return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
  27 }
  28
  29 static inline unsigned int
  30 __gnu_dev_minor(unsigned long long int __dev)
  31 {
  32   return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
  33 }
  34
  35 static inline unsigned long long int
  36 __gnu_dev_makedev(unsigned int __major, unsigned int __minor)
  37 {
  38   return ((__minor & 0xff) | ((__major & 0xfff) << 8)
  39           | (((unsigned long long int) (__minor & ~0xff)) << 12)
  40           | (((unsigned long long int) (__major & ~0xfff)) << 32));
  41 }
  42
  43 /* Access the functions with their traditional names.  */
  44 #ifndef major
  45 # define major(dev) __gnu_dev_major (dev)
  46 #endif
  47
  48 #ifndef minor
  49 # define minor(dev) __gnu_dev_minor (dev)
  50 #endif
  51
  52 #ifndef makedev
  53 # define makedev(maj, min) __gnu_dev_makedev (maj, min)
  54 #endif
  55
  56 #endif /* sys/sysmacros.h */