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       1                 :            : /* Definitions of macros to access `dev_t' values.
       2                 :            :    Copyright (C) 1996, 1997, 1999, 2003, 2004, 2007, 2011
       3                 :            :    Free Software Foundation, Inc.
       4                 :            :    This file is part of the GNU C Library.
       5                 :            : 
       6                 :            :    The GNU C Library is free software; you can redistribute it and/or
       7                 :            :    modify it under the terms of the GNU Lesser General Public
       8                 :            :    License as published by the Free Software Foundation; either
       9                 :            :    version 2.1 of the License, or (at your option) any later version.
      10                 :            : 
      11                 :            :    The GNU C Library is distributed in the hope that it will be useful,
      12                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14                 :            :    Lesser General Public License for more details.
      15                 :            : 
      16                 :            :    You should have received a copy of the GNU Lesser General Public
      17                 :            :    License along with the GNU C Library; if not, write to the Free
      18                 :            :    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
      19                 :            :    02111-1307 USA.  */
      20                 :            : 
      21                 :            : #ifndef _SYS_SYSMACROS_H
      22                 :            : #define _SYS_SYSMACROS_H        1
      23                 :            : 
      24                 :            : #include <features.h>
      25                 :            : 
      26                 :            : /* If the compiler does not know long long it is out of luck.  We are
      27                 :            :    not going to hack weird hacks to support the dev_t representation
      28                 :            :    they need.  */
      29                 :            : #ifdef __GLIBC_HAVE_LONG_LONG
      30                 :            : __BEGIN_DECLS
      31                 :            : 
      32                 :            : __extension__
      33                 :            : extern unsigned int gnu_dev_major (unsigned long long int __dev)
      34                 :            :      __THROW __attribute_const__;
      35                 :            : __extension__
      36                 :            : extern unsigned int gnu_dev_minor (unsigned long long int __dev)
      37                 :            :      __THROW __attribute_const__;
      38                 :            : __extension__
      39                 :            : extern unsigned long long int gnu_dev_makedev (unsigned int __major,
      40                 :            :                                                unsigned int __minor)
      41                 :            :      __THROW __attribute_const__;
      42                 :            : 
      43                 :            : # if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES
      44                 :            : __extension__ __extern_inline __attribute_const__ unsigned int
      45                 :            : __NTH (gnu_dev_major (unsigned long long int __dev))
      46                 :            : {
      47                 :        415 :   return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
      48                 :            : }
      49                 :            : 
      50                 :            : __extension__ __extern_inline __attribute_const__ unsigned int
      51                 :            : __NTH (gnu_dev_minor (unsigned long long int __dev))
      52                 :            : {
      53                 :            :   return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
      54                 :            : }
      55                 :            : 
      56                 :            : __extension__ __extern_inline __attribute_const__ unsigned long long int
      57                 :            : __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
      58                 :            : {
      59                 :            :   return ((__minor & 0xff) | ((__major & 0xfff) << 8)
      60                 :            :           | (((unsigned long long int) (__minor & ~0xff)) << 12)
      61                 :            :           | (((unsigned long long int) (__major & ~0xfff)) << 32));
      62                 :            : }
      63                 :            : # endif
      64                 :            : __END_DECLS
      65                 :            : 
      66                 :            : /* Access the functions with their traditional names.  */
      67                 :            : # define major(dev) gnu_dev_major (dev)
      68                 :            : # define minor(dev) gnu_dev_minor (dev)
      69                 :            : # define makedev(maj, min) gnu_dev_makedev (maj, min)
      70                 :            : #endif
      71                 :            : 
      72                 :            : #endif /* sys/sysmacros.h */