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TTYAgent.h
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1998-08-21
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// $Id: TTYAgent.h,v 1.21 1998/08/21 10:21:52 zeller Exp $ -*- C++ -*-
// An agent interface using ptys (pseudo ttys)
// Copyright (C) 1995 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>.
#ifndef _DDD_TTYAgent_h
#define _DDD_TTYAgent_h
#ifdef __GNUG__
#pragma interface
#endif
#include "LiterateA.h"
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h> // O_RDWR
const unsigned TTYAgent_NTypes = LiterateAgent_NTypes;
class TTYAgent: public LiterateAgent {
public:
DECLARE_TYPE_INFO
private:
string _master_tty; // master side of terminal
string _slave_tty; // slave side of terminal
int master; // master file descriptor
int slave; // slave file descriptor
bool push; // true if extra devices must be pushed
void open_master(); // find and open master tty
void open_slave(); // open slave tty
protected:
// Hooks for alternative communication schemes
virtual int setupCommunication();
virtual int setupChildCommunication();
virtual int setupParentCommunication();
// Open a tty.
// Like open(TTY, FLAGS), but care for EAGAIN and EWOULDBLOCK conditions
virtual int open_tty(const char *tty, int flags = O_RDWR);
// Check whether a TTY is usable
virtual bool tty_ok(const char *tty);
public:
// Constructors
TTYAgent(XtAppContext app_context, const string& pth,
unsigned nTypes = TTYAgent_NTypes):
LiterateAgent(app_context, pth, nTypes),
_master_tty(), _slave_tty(),
master(-1), slave(-1),
push(false)
{}
TTYAgent(XtAppContext app_context, FILE *in = stdin,
FILE *out = stdout, FILE *err = 0,
unsigned nTypes = TTYAgent_NTypes):
LiterateAgent(app_context, in, out, err, nTypes),
_master_tty(), _slave_tty(),
master(-1), slave(-1),
push(false)
{}
TTYAgent(XtAppContext app_context, bool dummy,
unsigned nTypes = TTYAgent_NTypes):
LiterateAgent(app_context, dummy, nTypes),
_master_tty(), _slave_tty(),
master(-1), slave(-1),
push(false)
{}
// Duplicator
TTYAgent (const TTYAgent& tty)
: LiterateAgent(tty),
_master_tty(tty.master_tty()),
_slave_tty(tty.slave_tty()),
master(tty.master),
slave(tty.slave),
push(tty.push)
{};
virtual Agent *dup() const { return new TTYAgent(*this); }
// Return the name of the used tty
const string& master_tty() const { return _master_tty; }
const string& slave_tty() const { return _slave_tty; }
};
#endif // _DDD_TTYAgent_h
// DON'T ADD ANYTHING BEHIND THIS #endif