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72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/* Definitions of macros to access `dev_t' values.
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Copyright (C) 1996, 1997, 1999, 2003, 2004, 2007, 2011
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_SYSMACROS_H
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#define _SYS_SYSMACROS_H 1
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#include <features.h>
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/* If the compiler does not know long long it is out of luck. We are
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not going to hack weird hacks to support the dev_t representation
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they need. */
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#ifdef __GLIBC_HAVE_LONG_LONG
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__BEGIN_DECLS
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__extension__
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extern unsigned int gnu_dev_major (unsigned long long int __dev)
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__THROW __attribute_const__;
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__extension__
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extern unsigned int gnu_dev_minor (unsigned long long int __dev)
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__THROW __attribute_const__;
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__extension__
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extern unsigned long long int gnu_dev_makedev (unsigned int __major,
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unsigned int __minor)
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__THROW __attribute_const__;
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# if defined __GNUC__ && __GNUC__ >= 2 && defined __USE_EXTERN_INLINES
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__extension__ __extern_inline __attribute_const__ unsigned int
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__NTH (gnu_dev_major (unsigned long long int __dev))
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{
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return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
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}
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__extension__ __extern_inline __attribute_const__ unsigned int
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__NTH (gnu_dev_minor (unsigned long long int __dev))
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{
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return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
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}
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__extension__ __extern_inline __attribute_const__ unsigned long long int
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__NTH (gnu_dev_makedev (unsigned int __major, unsigned int __minor))
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{
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return ((__minor & 0xff) | ((__major & 0xfff) << 8)
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| (((unsigned long long int) (__minor & ~0xff)) << 12)
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| (((unsigned long long int) (__major & ~0xfff)) << 32));
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}
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# endif
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__END_DECLS
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/* Access the functions with their traditional names. */
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# define major(dev) gnu_dev_major (dev)
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# define minor(dev) gnu_dev_minor (dev)
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# define makedev(maj, min) gnu_dev_makedev (maj, min)
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#endif
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#endif /* sys/sysmacros.h */
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