/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QWSSHAREDMEMORY_P_H
#define QWSSHAREDMEMORY_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qplatformdefs.h"
#include "QtCore/qstring.h"

QT_BEGIN_NAMESPACE

#if !defined(QT_NO_QWS_MULTIPROCESS)

class QWSSharedMemory {
public:

    QWSSharedMemory();
    ~QWSSharedMemory();

    void setPermissions(mode_t mode);
    int size() const;
    void *address() { return shmBase; }

    int id() const { return shmId; }

    void detach();

    bool create(int size);
    bool attach(int id);

    //bool create(int size, const QString &filename, char c = 'Q');
    //bool attach(const QString &filename, char c = 'Q');
// old API

    QWSSharedMemory(int, const QString &, char c = 'Q');
    void * base() { return address(); }

    bool create();
    void destroy();

    bool attach();

private:
    void *shmBase;
    int shmSize;
    QString shmFile;
    char character;
    int shmId;
    key_t key;
};

#endif // QT_NO_QWS_MULTIPROCESS

QT_END_NAMESPACE

#endif // QWSSHAREDMEMORY_P_H