1  /* Definitions of macros to access `dev_t' values.  Hurd version.
       2     Copyright (C) 1996-2023 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     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _BITS_SYSMACROS_H
      20  #define _BITS_SYSMACROS_H 1
      21  
      22  #ifndef _SYS_SYSMACROS_H
      23  # error "Never include <bits/sysmacros.h> directly; use <sys/sysmacros.h> instead."
      24  #endif
      25  
      26  /* The Hurd version of dev_t in glibc is a 32-bit quantity, with 8-bit
      27     major and 24-bit minor numbers.  The encoding is mmmmMMmm, where M is a
      28     hex digit of the major number and m is a hex digit of the minor number.  */
      29  
      30  #define __SYSMACROS_DECLARE_MAJOR(DECL_TEMPL)                   \
      31    DECL_TEMPL(unsigned int, major, (__dev_t __dev))
      32  
      33  #define __SYSMACROS_DEFINE_MAJOR(DECL_TEMPL)                    \
      34    __SYSMACROS_DECLARE_MAJOR (DECL_TEMPL)                        \
      35    {                                                             \
      36      return ((__dev & (__dev_t) 0x0000ff00u) >> 8);              \
      37    }
      38  
      39  #define __SYSMACROS_DECLARE_MINOR(DECL_TEMPL)                   \
      40    DECL_TEMPL(unsigned int, minor, (__dev_t __dev))
      41  
      42  #define __SYSMACROS_DEFINE_MINOR(DECL_TEMPL)                    \
      43    __SYSMACROS_DECLARE_MINOR (DECL_TEMPL)                        \
      44    {                                                             \
      45      return (__dev & (__dev_t) 0xffff00ff);                      \
      46    }
      47  
      48  #define __SYSMACROS_DECLARE_MAKEDEV(DECL_TEMPL)                 \
      49    DECL_TEMPL(__dev_t, makedev, (unsigned int __major, unsigned int __minor))
      50  
      51  #define __SYSMACROS_DEFINE_MAKEDEV(DECL_TEMPL)                  \
      52    __SYSMACROS_DECLARE_MAKEDEV (DECL_TEMPL)                      \
      53    {                                                             \
      54      __dev_t __dev;                                              \
      55      __dev  = (((__dev_t) (__major & 0x000000ffu)) << 8);        \
      56      __dev |= (((__dev_t) (__minor & 0xffff00ffu)) << 0);        \
      57      return __dev;                                               \
      58    }
      59  
      60  #endif /* bits/sysmacros.h */