1/* Definitions of macros to access `dev_t' values.
2 Copyright (C) 1996-2015 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#include <features.h>
23
24__BEGIN_DECLS
25
26__extension__
27extern unsigned int gnu_dev_major (unsigned long long int __dev)
28 __THROW __attribute_const__;
29__extension__
30extern unsigned int gnu_dev_minor (unsigned long long int __dev)
31 __THROW __attribute_const__;
32__extension__
33extern unsigned long long int gnu_dev_makedev (unsigned int __major,
34 unsigned int __minor)
35 __THROW __attribute_const__;
36
37#ifdef __USE_EXTERN_INLINES
38__extension__ __extern_inline __attribute_const__ unsigned int
39__NTH (gnu_dev_major (unsigned long long int __dev))
40{
41 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
42}
43
44__extension__ __extern_inline __attribute_const__ unsigned int
45__NTH (gnu_dev_minor (unsigned long long int __dev))
46{
47 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
48}
49
50__extension__ __extern_inline __attribute_const__ unsigned long long int
51__NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
52{
53 return ((__minor & 0xff) | ((__major & 0xfff) << 8)
54 | (((unsigned long long int) (__minor & ~0xff)) << 12)
55 | (((unsigned long long int) (__major & ~0xfff)) << 32));
56}
57#endif
58__END_DECLS
59
60/* Access the functions with their traditional names. */
61#define major(dev) gnu_dev_major (dev)
62#define minor(dev) gnu_dev_minor (dev)
63#define makedev(maj, min) gnu_dev_makedev (maj, min)
64
65#endif /* sys/sysmacros.h */
66