kolibrios-fun/programs/develop/open watcom/trunk/clib/intel/grabfp87.c

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "variety.h"
//#include <signal.h>
#include "rtdata.h"

extern  void    __Init_FPE_handler();
extern  void    __Fini_FPE_handler();
#ifdef __DOS_386__
extern int __FPEHandlerStart_;
extern int __FPEHandlerEnd_;
extern int __DPMI_hosted(void);
#endif

void __GrabFP87( void )
{
#ifndef __WINDOWS__
    if( _RWD_FPE_handler_exit != __Fini_FPE_handler ) {
#ifdef __DOS_386__
        if( !_IsPharLap() && ( __DPMI_hosted() == 1 )) {
            DPMILockLinearRegion((long)&__FPEHandlerStart_,
                ((long)&__FPEHandlerEnd_ - (long)&__FPEHandlerStart_));
        }
#endif
        __Init_FPE_handler();
        _RWD_FPE_handler_exit = __Fini_FPE_handler;
    }
#endif
}