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1 : : /* Definitions of macros to access `dev_t' values.
2 : : Copyright (C) 1996, 1997, 1999, 2003, 2004, 2007, 2011
3 : : Free Software Foundation, Inc.
4 : : This file is part of the GNU C Library.
5 : :
6 : : The GNU C Library is free software; you can redistribute it and/or
7 : : modify it under the terms of the GNU Lesser General Public
8 : : License as published by the Free Software Foundation; either
9 : : version 2.1 of the License, or (at your option) any later version.
10 : :
11 : : The GNU C Library is distributed in the hope that it will be useful,
12 : : but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 : : Lesser General Public License for more details.
15 : :
16 : : You should have received a copy of the GNU Lesser General Public
17 : : License along with the GNU C Library; if not, see
18 : : <http://www.gnu.org/licenses/>. */
19 : :
20 : : #ifndef _SYS_SYSMACROS_H
21 : : #define _SYS_SYSMACROS_H 1
22 : :
23 : : #include <features.h>
24 : :
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
27 : : they need. */
28 : : #ifdef __GLIBC_HAVE_LONG_LONG
29 : : __BEGIN_DECLS
30 : :
31 : : __extension__
32 : : extern unsigned int gnu_dev_major (unsigned long long int __dev)
33 : : __THROW __attribute_const__;
34 : : __extension__
35 : : extern unsigned int gnu_dev_minor (unsigned long long int __dev)
36 : : __THROW __attribute_const__;
37 : : __extension__
38 : : extern unsigned long long int gnu_dev_makedev (unsigned int __major,
39 : : unsigned int __minor)
40 : : __THROW __attribute_const__;
41 : :
42 : : # if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES
43 : : __extension__ __extern_inline __attribute_const__ unsigned int
44 : : __NTH (gnu_dev_major (unsigned long long int __dev))
45 : : {
46 : 1043 : return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
47 : : }
48 : :
49 : : __extension__ __extern_inline __attribute_const__ unsigned int
50 : : __NTH (gnu_dev_minor (unsigned long long int __dev))
51 : : {
52 : 4 : return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
53 : : }
54 : :
55 : : __extension__ __extern_inline __attribute_const__ unsigned long long int
56 : : __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
57 : : {
58 : : return ((__minor & 0xff) | ((__major & 0xfff) << 8)
59 : : | (((unsigned long long int) (__minor & ~0xff)) << 12)
60 : : | (((unsigned long long int) (__major & ~0xfff)) << 32));
61 : : }
62 : : # endif
63 : : __END_DECLS
64 : :
65 : : /* Access the functions with their traditional names. */
66 : : # define major(dev) gnu_dev_major (dev)
67 : : # define minor(dev) gnu_dev_minor (dev)
68 : : # define makedev(maj, min) gnu_dev_makedev (maj, min)
69 : : #endif
70 : :
71 : : #endif /* sys/sysmacros.h */
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