/****************************************************************************
*
*                            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 <stddef.h>
#include <signal.h>
#include <dos.h>
#define INCL_DOSSIGNALS
#include <wos2.h>

extern  void    __null_int23_exit();
extern  void    (*__int23_exit)();

static PFNSIGHANDLER handler = 0;
static USHORT        action;

//#pragma off(unreferenced);
static _WCFAR pascal break_handler( USHORT sigarg, USHORT signum )
//#pragma on(unreferenced);
    {
        if( __int23_exit != __null_int23_exit ) raise( SIGINT );
    }

static void restore_handler()
    {
        DosSetSigHandler( handler, &handler, &action, action, SIG_CTRLC );
        handler = 0;
        __int23_exit = __null_int23_exit;
    }


void __grab_int23()
    {
        USHORT          action;

        if( handler != 0 ) return;
        DosSetSigHandler( (PFNSIGHANDLER)break_handler, &handler, &action, 2, SIG_CTRLC );
        __int23_exit = restore_handler;
    }

