1 /* Definitions of macros to access `dev_t' values.
2 Copyright (C) 1996, 1997, 1999, 2003, 2004 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 /* If the compiler does not know long long it is out of luck. We are
27 not going to hack weird hacks to support the dev_t representation
28 they need. */
29
30 __extension__
31 extern unsigned int gnu_dev_major (unsigned long long int __dev)
32 __THROW __attribute__ ((__const__));
33 libc_hidden_proto(gnu_dev_major)
34 __extension__
35 extern unsigned int gnu_dev_minor (unsigned long long int __dev)
36 __THROW __attribute__ ((__const__));
37 libc_hidden_proto(gnu_dev_minor)
38 __extension__
39 extern unsigned long long int gnu_dev_makedev (unsigned int __major,
40 unsigned int __minor)
41 __THROW __attribute__ ((__const__));
42
43 # ifdef __USE_EXTERN_INLINES
44 __extension__ __extern_inline __attribute__ ((__const__)) unsigned int
__NTH(gnu_dev_major (unsigned long long int __dev))45 __NTH (gnu_dev_major (unsigned long long int __dev))
46 {
47 return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
48 }
49
50 __extension__ __extern_inline __attribute__ ((__const__)) unsigned int
__NTH(gnu_dev_minor (unsigned long long int __dev))51 __NTH (gnu_dev_minor (unsigned long long int __dev))
52 {
53 return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
54 }
55
56 __extension__ __extern_inline __attribute__ ((__const__)) unsigned long long int
__NTH(gnu_dev_makedev (unsigned int __major,unsigned int __minor))57 __NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
58 {
59 return ((__minor & 0xff) | ((__major & 0xfff) << 8)
60 | (((unsigned long long int) (__minor & ~0xff)) << 12)
61 | (((unsigned long long int) (__major & ~0xfff)) << 32));
62 }
63 # endif
64 __END_DECLS
65
66 /* Access the functions with their traditional names. */
67 # define major(dev) gnu_dev_major (dev)
68 # define minor(dev) gnu_dev_minor (dev)
69 # define makedev(maj, min) gnu_dev_makedev (maj, min)
70
71 #endif /* sys/sysmacros.h */
72