device.h

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/* @(#)device.h 1.19 09/11/16 Copyright 1995-2007 J. Schilling */
/*
 *  Generic header for users of major(), minor() and makedev()
 *
 *  Copyright (c) 1995-2007 J. Schilling
 */
/*
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * See the file CDDL.Schily.txt in this distribution for details.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file CDDL.Schily.txt from this distribution.
 */
 
#ifndef _SCHILY_DEVICE_H
#define _SCHILY_DEVICE_H
 
#ifndef _SCHILY_MCONFIG_H
#include <schily/mconfig.h>
#endif
 
/*
 * On generic SVR4, major is a function (defined in sys/mkdev.h).
 * On Solaris it is defined ...
 * As we cannot just test if major is #define'd, we have to
 * define _FOUND_MAJOR_ instead.
 *
 * WARNING: Do never include <sys/sysmacros.h> in SVR4, it contains
 * an old definition for major()/minor() defining 8 minorbits.
 * Use <sys/mkdev.h> instead.
 */
#ifndef _SCHILY_TYPES_H
#include <schily/types.h>
#endif
 
/*
 * Some systems define major in <sys/types.h>.
 * We are ready...
 */
#ifdef major
#   define _FOUND_MAJOR_
#endif
 
#ifdef MAJOR_IN_MKDEV
#   ifndef  _INCL_SYS_MKDEV_H
#   include <sys/mkdev.h>
#   define  _INCL_SYS_MKDEV_H
#   endif
    /*
     * Interix doesn't use makedev(); it uses mkdev()
     */
#   if !defined(makedev) && defined(mkdev)
#       define makedev(a, b)    mkdev((a), (b))
#   endif
#   define _FOUND_MAJOR_
#endif
 
#ifndef _FOUND_MAJOR_
#   ifdef MAJOR_IN_SYSMACROS
#       ifndef  _INCL_SYS_SYSMACROS_H
#       include <sys/sysmacros.h>
#       define  _INCL_SYS_SYSMACROS_H
#       endif
#       define _FOUND_MAJOR_
#   endif
#endif
 
/*
 * If we are on HP/UX before HP/UX 8,
 * major/minor are not in <sys/sysmacros.h>.
 */
#ifndef _FOUND_MAJOR_
#   if defined(hpux) || defined(__hpux__) || defined(__hpux)
#       ifndef  _INCL_SYS_MKOD_H
#       include <sys/mknod.h>
#       define  _INCL_SYS_MKOD_H
#       endif
#       define _FOUND_MAJOR_
#   endif
#endif
 
#ifndef _FOUND_MAJOR_
#   ifdef VMS
#       define major(dev)       (((((long)dev) >> 8) & 0xFF))
#       define minor(dev)       ((((long)dev) & 0xFF))
#       define makedev(majo, mino)  (((majo) << 8) | (mino))
#       define _FOUND_MAJOR_
#   endif /* VMS */
#endif /* _FOUND_MAJOR_ */
 
#ifdef  __cplusplus
extern "C" {
#endif
 
/*
 * For all other systems define major()/minor() here.
 * XXX Check if this definition will be usefull for ms dos too.
 */
#ifndef _FOUND_MAJOR_
#   define major(dev)       (((dev) >> 8) & 0xFF)
#   define minor(dev)       ((dev) & 0xFF)
#   define makedev(majo, mino)  (((majo) << 8) | (mino))
#endif
 
/*
 * Don't pollute namespace...
 */
#undef _FOUND_MAJOR_
 
#ifdef  __XDEV__
/*
 * The following defines are currently only needed for 'star'.
 * We make it conditional code to avoid to pollute the namespace.
 */
#define XDEV_T  unsigned long
 
extern  int minorbits;
extern  XDEV_T  minormask;
extern  XDEV_T  _dev_mask[];
 
#define dev_major(dev)          (((XDEV_T)(dev)) >> minorbits)
#define _dev_major(mbits, dev)      (((XDEV_T)(dev)) >> (mbits))
 
#define dev_minor(dev)          (((XDEV_T)(dev)) & minormask)
#define _dev_minor(mbits, dev)      (((XDEV_T)(dev)) & _dev_mask[(mbits)])
 
 
#define dev_make(majo, mino)        ((((XDEV_T)(majo)) << minorbits) | \
                            ((XDEV_T)(mino)))
#define _dev_make(mbits, majo, mino)    ((((XDEV_T)(majo)) << (mbits) | \
                            ((XDEV_T)(mino)))
 
extern  void    dev_init    __PR((BOOL debug));
#ifndef dev_major
extern  XDEV_T  dev_major   __PR((XDEV_T dev));
extern  XDEV_T  _dev_major  __PR((int mbits, XDEV_T dev));
extern  XDEV_T  dev_minor   __PR((XDEV_T dev));
extern  XDEV_T  _dev_minor  __PR((int mbits, XDEV_T dev));
extern  XDEV_T  dev_make    __PR((XDEV_T majo, XDEV_T mino));
extern  XDEV_T  _dev_make   __PR((int mbits, XDEV_T majo, XDEV_T mino));
#endif
 
#endif  /* __XDEV__ */
 
#ifdef  __cplusplus
}
#endif
 
#endif  /* _SCHILY_DEVICE_H */