sysdeps/generic/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 /* For compatibility we provide alternative names.
  23
  24    The problem here is that compilers other than GCC probably don't
  25    have the `long long' type and so `dev_t' is actually an array.  */
  26 #define major(dev) ((int)(((unsigned int) (dev) >> 8) & 0xff))
  27 #define minor(dev) ((int)((dev) & 0xff))
  28 #define makedev(major, minor) (((major) << 8) | (minor))
  29
  30 #endif /* sys/sysmacros.h */