/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtDBus 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.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include <QtCore/qglobal.h>

#include <QtCore/qlibrary.h>

#include <QtCore/qmutex.h>

#include <private/qmutexpool_p.h>

QT_BEGIN_NAMESPACE

void *qdbus_resolve_me(const char *name);

#if !defined QT_LINKED_LIBDBUS

static QLibrary *qdbus_libdbus = 0;

void qdbus_unloadLibDBus()

{

    delete qdbus_libdbus;

    qdbus_libdbus = 0;

}

bool qdbus_loadLibDBus()

{

    static volatile bool triedToLoadLibrary = false;

#ifndef QT_NO_THREAD

    QMutexLocker locker(QMutexPool::globalInstanceGet((void *)&qdbus_resolve_me));

#endif

    QLibrary *&lib = qdbus_libdbus;

    if (triedToLoadLibrary)

        return lib && lib->isLoaded();

    lib = new QLibrary;

    triedToLoadLibrary = true;

    static int majorversions[] = { 3, 2, -1 };

    lib->unload();

    lib->setFileName(QLatin1String("dbus-1"));

    for (uint i = 0; i < sizeof(majorversions) / sizeof(majorversions[0]); ++i) {

        lib->setFileNameAndVersion(lib->fileName(), majorversions[i]);

        if (lib->load() && lib->resolve("dbus_connection_open_private"))

            return true;

        lib->unload();

    }

    delete lib;

    lib = 0;

    return false;

}

void *qdbus_resolve_conditionally(const char *name)

{

    if (qdbus_loadLibDBus())

        return qdbus_libdbus->resolve(name);

    return 0;

}

void *qdbus_resolve_me(const char *name)

{

    void *ptr = 0;

    if (!qdbus_loadLibDBus())

        qFatal("Cannot find libdbus-1 in your system to resolve symbol '%s'.", name);

    ptr = qdbus_libdbus->resolve(name);

    if (!ptr)

        qFatal("Cannot resolve '%s' in your libdbus-1.", name);

    return ptr;

}

Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus)

QT_END_NAMESPACE