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                 : #include <features.h>
      24                 : 
      25                 : /* If the compiler does not know long long it is out of luck.  We are
      26                 :    not going to hack weird hacks to support the dev_t representation
      27                 :    they need.  */
      28                 : #ifdef __GLIBC_HAVE_LONG_LONG
      29                 : __extension__
      30                 : extern __inline unsigned int gnu_dev_major (unsigned long long int __dev)
      31                 :      __THROW;
      32                 : __extension__
      33                 : extern __inline unsigned int gnu_dev_minor (unsigned long long int __dev)
      34                 :      __THROW;
      35                 : __extension__
      36                 : extern __inline unsigned long long int gnu_dev_makedev (unsigned int __major,
      37                 :                                                         unsigned int __minor)
      38                 :      __THROW;
      39                 : 
      40                 : # if defined __GNUC__ && __GNUC__ >= 2
      41                 : __extension__ extern __inline unsigned int
      42                 : __NTH (gnu_dev_major (unsigned long long int __dev))
      43               0 : {
      44               0 :   return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
      45                 : }
      46                 : 
      47                 : __extension__ extern __inline unsigned int
      48                 : __NTH (gnu_dev_minor (unsigned long long int __dev))
      49               0 : {
      50               0 :   return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
      51                 : }
      52                 : 
      53                 : __extension__ extern __inline unsigned long long int
      54                 : __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
      55               0 : {
      56               0 :   return ((__minor & 0xff) | ((__major & 0xfff) << 8)
      57                 :           | (((unsigned long long int) (__minor & ~0xff)) << 12)
      58                 :           | (((unsigned long long int) (__major & ~0xfff)) << 32));
      59                 : }
      60                 : # endif
      61                 : 
      62                 : 
      63                 : /* Access the functions with their traditional names.  */
      64                 : # define major(dev) gnu_dev_major (dev)
      65                 : # define minor(dev) gnu_dev_minor (dev)
      66                 : # define makedev(maj, min) gnu_dev_makedev (maj, min)
      67                 : #endif
      68                 : 
      69                 : #endif /* sys/sysmacros.h */