1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

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

     6 **

     7 ** This file is part of the QtDBus module of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <QtCore/qglobal.h>

    43 #include <QtCore/qlibrary.h>

    44 #include <QtCore/qmutex.h>

    45 #include <private/qmutexpool_p.h>

    46 

    47 QT_BEGIN_NAMESPACE

    48 

    49 void *qdbus_resolve_me(const char *name);

    50 

    51 #if !defined QT_LINKED_LIBDBUS

    52 

    53 static QLibrary *qdbus_libdbus = 0;

    54 

    55 void qdbus_unloadLibDBus()

    56 {

    57     delete qdbus_libdbus;

    58     qdbus_libdbus = 0;

    59 }

    60 

    61 bool qdbus_loadLibDBus()

    62 {

    63     static volatile bool triedToLoadLibrary = false;

    64 #ifndef QT_NO_THREAD

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

    66 #endif

    67     QLibrary *&lib = qdbus_libdbus;

    68     if (triedToLoadLibrary)

    69         return lib && lib->isLoaded();

    70 

    71     lib = new QLibrary;

    72     triedToLoadLibrary = true;

    73 

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

    75     lib->unload();

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

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

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

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

    80             return true;

    81 

    82         lib->unload();

    83     }

    84 

    85     delete lib;

    86     lib = 0;

    87     return false;

    88 }

    89 

    90 void *qdbus_resolve_conditionally(const char *name)

    91 {

    92     if (qdbus_loadLibDBus())

    93         return qdbus_libdbus->resolve(name);

    94     return 0;

    95 }

    96 

    97 void *qdbus_resolve_me(const char *name)

    98 {

    99     void *ptr = 0;

   100     if (!qdbus_loadLibDBus())

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

   102 

   103     ptr = qdbus_libdbus->resolve(name);

   104     if (!ptr)

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

   106 

   107     return ptr;

   108 }

   109 

   110 Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus)

   111 

   112 QT_END_NAMESPACE

   113 

   114 #endif