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__
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