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 | |
49 | QT_BEGIN_NAMESPACE |
50 | |
51 | void *qdbus_resolve_me(const char *name); |
52 | |
53 | #if !defined QT_LINKED_LIBDBUS |
54 | |
55 | static QLibrary *qdbus_libdbus = 0; |
56 | |
57 | void qdbus_unloadLibDBus() |
58 | { |
59 | delete qdbus_libdbus; |
60 | qdbus_libdbus = 0; |
61 | } |
62 | |
63 | bool 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 | |
93 | void *qdbus_resolve_conditionally(const char *name) |
94 | { |
95 | if (qdbus_loadLibDBus()) |
96 | return qdbus_libdbus->resolve(name); |
97 | return 0; |
98 | } |
99 | |
100 | void *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 | |
113 | Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus) |
114 | |
115 | #endif // QT_LINKED_LIBDBUS |
116 | |
117 | QT_END_NAMESPACE |
118 | |
119 | #endif // QT_NO_DBUS |
120 | |