Debugger: Introduce a pty based channel to inferiors

This is experimental for now and requires QTC_USE_PTY=1
in the environment to be used.

Change-Id: I460ce7b9283467d481e903f731f4243b7e5ec094
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/terminal.h

@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://www.qt.io/licensing.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef DEBUGGER_TERMINAL_H
+#define DEBUGGER_TERMINAL_H
+
+#include <QCoreApplication>
+#include <QSocketNotifier>
+
+namespace Debugger {
+namespace Internal {
+
+class Terminal : public QObject
+{
+    Q_OBJECT
+
+public:
+    Terminal(QObject *parent = 0);
+
+    void setup();
+    bool isUsable() const;
+
+    QByteArray slaveDevice() const { return m_slaveName; }
+
+    int write(const QByteArray &msg);
+    bool sendInterrupt();
+
+signals:
+    void stdOutReady(const QString &);
+    void stdErrReady(const QString &);
+    void error(const QString &);
+
+private:
+    void onSlaveReaderActivated(int fd);
+
+    bool m_isUsable;
+    int m_masterFd;
+    QSocketNotifier *m_masterReader;
+    QByteArray m_slaveName;
+};
+
+} // namespace Internal
+} // namespace Debugger
+
+#endif // DEBUGGER_TERMINAL_H