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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
/* Definitions of macros to access `dev_t' values.
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Copyright (C) 1996, 1997, 1999 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _SYS_SYSMACROS_H
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#define _SYS_SYSMACROS_H 1
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/* For compatibility we provide alternative names.
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The problem here is that compilers other than GCC probably don't
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have the `long long' type and so `dev_t' is actually an array. */
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#if defined __GNUC__ && __GNUC__ >= 2
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# define major(dev) ((int)(((dev) >> 8) & 0xff))
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# define minor(dev) ((int)((dev) & 0xff))
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# define makedev(major, minor) ((((unsigned int) (major)) << 8) \
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| ((unsigned int) (minor)))
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#else
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/* We need to know the word order here. This assumes that the word order
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is consistent with the byte order. */
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# include <endian.h>
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# if __BYTE_ORDER == __BIG_ENDIAN
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# define major(dev) (((dev).__val[1] >> 8) & 0xff)
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# define minor(dev) ((dev).__val[1] & 0xff)
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# define makedev(major, minor) { 0, ((((unsigned int) (major)) << 8) \
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| ((unsigned int) (minor))) }
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# else
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# define major(dev) (((dev).__val[0] >> 8) & 0xff)
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# define minor(dev) ((dev).__val[0] & 0xff)
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# define makedev(major, minor) { ((((unsigned int) (major)) << 8) \
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| ((unsigned int) (minor))), 0 }
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# endif
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#endif
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#endif /* sys/sysmacros.h */
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