grabfp87.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 65 行

/****************************************************************************
*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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#include "variety.h"
//#include <signal.h>
#include "rtdata.h"

#ifndef __WINDOWS__
    #include "extender.h"
    #include "dpmi.h"
#endif

extern  void    __Init_FPE_handler( void );
extern  void    __Fini_FPE_handler( void );
#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
}