/*
 * Copyright (c) 1996 The Regents of the University of California.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement
 * is hereby granted, provided that the above copyright notice and the
 * following two paragraphs appear in all copies of this software.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
 * OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE
 * UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 *
 * $Id: iohandler.cc,v 1.3 1996/06/09 01:13:40 aswan Exp $
 */

#include "iohandler.h"

IOHandler::IOHandler() : fd_(-1)
{
}

IOHandler::~IOHandler()
{
	if (fd_ >= 0)
		unlink();
}

void IOHandler::link(int fd, int mask)
{
	fd_ = fd;
	Tk_CreateFileHandler(fd, mask, callback, (ClientData)this);
}

void IOHandler::unlink()
{
	if (fd_ >= 0) {
		Tk_DeleteFileHandler(fd_);
		fd_ = -1;
	}
}

void IOHandler::callback(ClientData cd, int mask)
{
	IOHandler* p = (IOHandler*)cd;
	p->dispatch(mask);
}