1 /* Definitions of macros to access `dev_t' values.
2 Copyright (C) 1996, 1997, 1999, 2003 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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
20 #ifndef _SYS_SYSMACROS_H
21 #define _SYS_SYSMACROS_H 1
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
29 extern __inline unsigned int gnu_dev_major (unsigned long long int __dev)
32 extern __inline unsigned int gnu_dev_minor (unsigned long long int __dev)
35 extern __inline unsigned long long int gnu_dev_makedev (unsigned int __major,
39 #if defined __GNUC__ && __GNUC__ >= 2
40 __extension__ extern __inline unsigned int
41 gnu_dev_major (unsigned long long int __dev) __THROW
43 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
46 __extension__ extern __inline unsigned int
47 gnu_dev_minor (unsigned long long int __dev) __THROW
49 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
52 __extension__ extern __inline unsigned long long int
53 gnu_dev_makedev (unsigned int __major, unsigned int __minor) __THROW
55 return ((__minor & 0xff) | ((__major & 0xfff) << 8)
56 | (((unsigned long long int) (__minor & ~0xff)) << 12)
57 | (((unsigned long long int) (__major & ~0xfff)) << 32));
62 /* Access the functions with their traditional names. */
63 #define major(dev) gnu_dev_major (dev)
64 #define minor(dev) gnu_dev_minor (dev)
65 #define makedev(maj, min) gnu_dev_makedev (maj, min)
67 #endif /* sys/sysmacros.h */