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

   1 /* Definitions of macros to access `dev_t' values.
   2    Copyright (C) 1996, 1997, 1999 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_SYSMACROS_H
  21 #define _SYS_SYSMACROS_H        1
  22
  23 #include <bits/wordsize.h>
  24
  25 /* For compatibility we provide alternative names.
  26
  27    The problem here is that compilers other than GCC probably don't
  28    have the `long long' type and so `dev_t' is actually an array.  */
  29 #if __WORDSIZE == 64 || (defined __GNUC__ && __GNUC__ >= 2)
  30 # define major(dev) ((int)(((dev) >> 8) & 0xff))
  31 # define minor(dev) ((int)((dev) & 0xff))
  32 # define makedev(major, minor) ((((unsigned int) (major)) << 8) \
  33                                 | ((unsigned int) (minor)))
  34 #else
  35 # define major(dev) (((dev).__val[1] >> 8) & 0xff)
  36 # define minor(dev) ((dev).__val[1] & 0xff)
  37 # define makedev(major, minor) { 0, ((((unsigned int) (major)) << 8) \
  38                                      | ((unsigned int) (minor))) }
  39 #endif
  40
  41 #endif /* sys/sysmacros.h */