sysmacros.h source code [include/x86_64-linux-gnu/sys/sysmacros.h]

1	/* Definitions of macros to access `dev_t' values.
2	Copyright (C) 1996-2016 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__
27	extern unsigned int gnu_dev_major (unsigned long long int __dev)
28	__THROW __attribute_const__;
29	__extension__
30	extern unsigned int gnu_dev_minor (unsigned long long int __dev)
31	__THROW __attribute_const__;
32	__extension__
33	extern 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

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