1/****************************************************************************
2**
3** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
4** Contact: http://www.qt-project.org/legal
5**
6** This file is part of the QtDBus module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Digia. For licensing terms and
14** conditions see http://qt.digia.com/licensing. For further information
15** use the contact form at http://qt.digia.com/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 2.1 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 2.1 requirements
23** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24**
25** In addition, as a special exception, Digia gives you certain additional
26** rights. These rights are described in the Digia Qt LGPL Exception
27** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28**
29** GNU General Public License Usage
30** Alternatively, this file may be used under the terms of the GNU
31** General Public License version 3.0 as published by the Free Software
32** Foundation and appearing in the file LICENSE.GPL included in the
33** packaging of this file. Please review the following information to
34** ensure the GNU General Public License version 3.0 requirements will be
35** met: http://www.gnu.org/copyleft/gpl.html.
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#ifndef QT_NO_DBUS
48
49QT_BEGIN_NAMESPACE
50
51void *qdbus_resolve_me(const char *name);
52
53#if !defined QT_LINKED_LIBDBUS
54
55static QLibrary *qdbus_libdbus = 0;
56
57void qdbus_unloadLibDBus()
58{
59 delete qdbus_libdbus;
60 qdbus_libdbus = 0;
61}
62
63bool qdbus_loadLibDBus()
64{
65 static volatile bool triedToLoadLibrary = false;
66#ifndef QT_NO_THREAD
67 QMutexLocker locker(QMutexPool::globalInstanceGet((void *)&qdbus_resolve_me));
68#endif
69 QLibrary *&lib = qdbus_libdbus;
70 if (triedToLoadLibrary)
71 return lib && lib->isLoaded();
72
73 lib = new QLibrary;
74 triedToLoadLibrary = true;
75
76 static int majorversions[] = { 3, 2, -1 };
77 lib->unload();
78 lib->setFileName(QLatin1String("dbus-1"));
79 lib->setLoadHints(QLibrary::ImprovedSearchHeuristics);
80 for (uint i = 0; i < sizeof(majorversions) / sizeof(majorversions[0]); ++i) {
81 lib->setFileNameAndVersion(lib->fileName(), majorversions[i]);
82 if (lib->load() && lib->resolve("dbus_connection_open_private"))
83 return true;
84
85 lib->unload();
86 }
87
88 delete lib;
89 lib = 0;
90 return false;
91}
92
93void *qdbus_resolve_conditionally(const char *name)
94{
95 if (qdbus_loadLibDBus())
96 return qdbus_libdbus->resolve(name);
97 return 0;
98}
99
100void *qdbus_resolve_me(const char *name)
101{
102 void *ptr = 0;
103 if (!qdbus_loadLibDBus())
104 qFatal("Cannot find libdbus-1 in your system to resolve symbol '%s'.", name);
105
106 ptr = qdbus_libdbus->resolve(name);
107 if (!ptr)
108 qFatal("Cannot resolve '%s' in your libdbus-1.", name);
109
110 return ptr;
111}
112
113Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus)
114
115#endif // QT_LINKED_LIBDBUS
116
117QT_END_NAMESPACE
118
119#endif // QT_NO_DBUS
120