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grabtest.C
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1998-04-28
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// $Id: grabtest.C,v 1.2 1998/04/28 14:40:38 zeller Exp $
// Simple grab tester -- debug this with DDD and `checkGrab' enabled.
// Copyright (C) 1998 Technische Universitaet Braunschweig, Germany.
// Written by Andreas Zeller <zeller@ips.cs.tu-bs.de>.
//
// This file is part of DDD.
//
// DDD is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// DDD is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with DDD -- see the file COPYING.
// If not, write to the Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// DDD is the data display debugger.
// For details, see the DDD World-Wide-Web page,
// `http://www.cs.tu-bs.de/softech/ddd/',
// or send a mail to the DDD developers <ddd@ips.cs.tu-bs.de>.
#include <X11/Xlib.h>
#include <unistd.h> // sleep()
#include <stdlib.h> // atoi()
#include <sys/types.h>
#include <iostream.h>
#include <signal.h>
int main(int argc, char *argv[])
{
Display *display = XOpenDisplay((char *)0);
if (display == 0)
{
cerr << "Cannot open display\n";
exit(1);
}
Window window = DefaultRootWindow(display);
int seconds = 5;
if (argc > 1 && atoi(argv[1]) > 0)
seconds = atoi(argv[1]);
cout << "Grabbing...";
cout.flush();
// We pass GrabModeAsync for the keyboard such that it will keep
// on working.
int grab_result = XGrabPointer(display, window,
True, 0, GrabModeSync, GrabModeAsync,
None, None, CurrentTime);
// Placing a breakpoint
//
// <====== here
//
// will interrupt this function while the pointer is grabbed.
// Rely on DDD `checkGrab' to ungrab it.
switch (grab_result)
{
case GrabSuccess:
cout << "GrabSuccess\n";
cout << "Sleeping for " << seconds << " seconds...";
cout.flush();
sleep(seconds);
XUngrabPointer(display, CurrentTime);
XFlush(display);
cout << "done.\n";
break;
case GrabNotViewable:
cout << "GrabNotViewable\n";
break;
case AlreadyGrabbed:
cout << "AlreadyGrabbed\n";
break;
case GrabFrozen:
cout << "GrabFrozen\n";
break;
case GrabInvalidTime:
cout << "GrabInvalidTime\n";
break;
default:
cout << grab_result << "\n";
break;
}
exit(0);
}