src/dbus/qdbus_symbols.cpp
author Alex Gilkes <alex.gilkes@nokia.com>
Mon, 11 Jan 2010 14:00:40 +0000
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtDBus module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore/qglobal.h>
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#include <QtCore/qlibrary.h>
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#include <QtCore/qmutex.h>
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#include <private/qmutexpool_p.h>
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QT_BEGIN_NAMESPACE
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void *qdbus_resolve_me(const char *name);
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#if !defined QT_LINKED_LIBDBUS
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static QLibrary *qdbus_libdbus = 0;
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void qdbus_unloadLibDBus()
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{
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    delete qdbus_libdbus;
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    qdbus_libdbus = 0;
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}
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bool qdbus_loadLibDBus()
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{
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    static volatile bool triedToLoadLibrary = false;
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#ifndef QT_NO_THREAD
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    QMutexLocker locker(QMutexPool::globalInstanceGet((void *)&qdbus_resolve_me));
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#endif
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    QLibrary *&lib = qdbus_libdbus;
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    if (triedToLoadLibrary)
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        return lib && lib->isLoaded();
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    lib = new QLibrary;
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    triedToLoadLibrary = true;
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    static int majorversions[] = { 3, 2, -1 };
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    lib->unload();
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    lib->setFileName(QLatin1String("dbus-1"));
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    for (uint i = 0; i < sizeof(majorversions) / sizeof(majorversions[0]); ++i) {
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        lib->setFileNameAndVersion(lib->fileName(), majorversions[i]);
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        if (lib->load() && lib->resolve("dbus_connection_open_private"))
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            return true;
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        lib->unload();
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    }
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    delete lib;
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    lib = 0;
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    return false;
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}
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void *qdbus_resolve_conditionally(const char *name)
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{
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    if (qdbus_loadLibDBus())
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        return qdbus_libdbus->resolve(name);
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    return 0;
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}
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void *qdbus_resolve_me(const char *name)
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{
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    void *ptr = 0;
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    if (!qdbus_loadLibDBus())
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        qFatal("Cannot find libdbus-1 in your system to resolve symbol '%s'.", name);
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    ptr = qdbus_libdbus->resolve(name);
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    if (!ptr)
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        qFatal("Cannot resolve '%s' in your libdbus-1.", name);
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    return ptr;
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}
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Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus)
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QT_END_NAMESPACE
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#endif