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/*
* Motif Tools Library, Version 3.1
* $Id$
*
* Written by David Flanagan.
* Copyright (c) 1992-2001 by David Flanagan.
* All Rights Reserved. See the file COPYRIGHT for details.
* This is open source software. See the file LICENSE for details.
* There is no warranty for this software. See NO_WARRANTY for details.
*
* $Log$
* Revision 1.1.1.1 2001/07/18 11:06:02 root
* Initial checkin.
*
* Revision 1.2 2001/06/12 16:25:28 andre
* *** empty log message ***
*
*
*/
/*
* The procedures in this file are only needed with DECWindows Xt
* libraries (VMS and Ultrix) to work around the fact that calling
* XtRemoveCallback causes a core dump.
* This is undeniably gross.
* See also Xmt.h, where we #define XtAddCallback and XtRemoveCallback
* to be these functions here.
*
* Note that these are not fully general replacements for the real functions;
* they don't work if a procedure is registered more than once, with
* different data on the same list in the same widget. But this doesn't
* happen in the Xmt library.
*/
#ifdef DECWINDOWS_CALLBACK_HACK
#include <Xmt/Xmt.h>
/* remove our redefinitions, so we get the real thing here. */
#undef XtAddCallback
#undef XtRemoveCallback
/*
* We use this no-op procedure as a placeholder, adding it
* whenever we remove a real callback procedure. This seems
* to prevent whatever corruption of the callback list occurs
*/
static void noop(Widget w, XtPointer tag, XtPointer data)
{
/* do nothing */
}
void _XmtDECAddCallback(Widget w, String name,
XtCallbackProc proc, XtPointer data)
{
XtRemoveCallback(w, name, noop, proc);
XtAddCallback(w, name, proc, data);
}
void _XmtDECRemoveCallback(Widget w, String name,
XtCallbackProc proc, XtPointer data)
{
XtRemoveCallback(w, name, proc, data);
XtAddCallback(w, name, noop, proc);
}
#else
/* just so the compiler doesn't complain about an empty file. */
static char XmtDummy;
#endif
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