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01: /* Definitions of macros to access `dev_t' values.
02:    Copyright (C) 1996, 1997, 1999, 2003, 2004, 2007, 2011
03:    Free Software Foundation, Inc.
04:    This file is part of the GNU C Library.
05: 
06:    The GNU C Library is free software; you can redistribute it and/or
07:    modify it under the terms of the GNU Lesser General Public
08:    License as published by the Free Software Foundation; either
09:    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, write to the Free
18:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19:    02111-1307 USA.  */
20: 
21: #ifndef _SYS_SYSMACROS_H
22: #define _SYS_SYSMACROS_H        1
23: 
24: #include <features.h>
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: #ifdef __GLIBC_HAVE_LONG_LONG
30: __BEGIN_DECLS
31: 
32: __extension__
33: extern unsigned int gnu_dev_major (unsigned long long int __dev)
34:      __THROW __attribute_const__;
35: __extension__
36: extern unsigned int gnu_dev_minor (unsigned long long int __dev)
37:      __THROW __attribute_const__;
38: __extension__
39: extern unsigned long long int gnu_dev_makedev (unsigned int __major,
40:                                                unsigned int __minor)
41:      __THROW __attribute_const__;
42: 
43: # if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES
44: __extension__ __extern_inline __attribute_const__ unsigned int
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
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
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: #endif
71: 
72: #endif /* sys/sysmacros.h */
73: 

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