| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Copyright (C) 2016 Intel Corporation. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtDBus module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
| ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-2.0.html and |
| ** https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include <QtCore/qglobal.h> |
| #if QT_CONFIG(library) |
| #include <QtCore/qlibrary.h> |
| #include <QtCore/private/qlocking_p.h> |
| #endif |
| #include <QtCore/qmutex.h> |
| |
| #ifndef QT_NO_DBUS |
| |
| extern "C" void dbus_shutdown(); |
| |
| QT_BEGIN_NAMESPACE |
| |
| void (*qdbus_resolve_me(const char *name))(); |
| |
| #if !defined QT_LINKED_LIBDBUS |
| |
| #if QT_CONFIG(library) |
| static QLibrary *qdbus_libdbus = 0; |
| |
| void qdbus_unloadLibDBus() |
| { |
| if (qdbus_libdbus) { |
| if (qEnvironmentVariableIsSet("QDBUS_FORCE_SHUTDOWN")) |
| qdbus_libdbus->resolve("dbus_shutdown")(); |
| qdbus_libdbus->unload(); |
| } |
| delete qdbus_libdbus; |
| qdbus_libdbus = 0; |
| } |
| #endif |
| |
| bool qdbus_loadLibDBus() |
| { |
| #if QT_CONFIG(library) |
| #ifdef QT_BUILD_INTERNAL |
| // this is to simulate a library load failure for our autotest suite. |
| if (!qEnvironmentVariableIsEmpty("QT_SIMULATE_DBUS_LIBFAIL")) |
| return false; |
| #endif |
| |
| static bool triedToLoadLibrary = false; |
| static QBasicMutex mutex; |
| const auto locker = qt_scoped_lock(mutex); |
| |
| QLibrary *&lib = qdbus_libdbus; |
| if (triedToLoadLibrary) |
| return lib && lib->isLoaded(); |
| |
| lib = new QLibrary; |
| lib->setLoadHints(QLibrary::ExportExternalSymbolsHint); // make libdbus symbols available for apps that need more advanced control over the dbus |
| triedToLoadLibrary = true; |
| |
| static int majorversions[] = { 3, 2, -1 }; |
| const QString baseNames[] = { |
| #ifdef Q_OS_WIN |
| QLatin1String("dbus-1"), |
| #endif |
| QLatin1String("libdbus-1") |
| }; |
| |
| lib->unload(); |
| for (const int majorversion : majorversions) { |
| for (const QString &baseName : baseNames) { |
| #ifdef Q_OS_WIN |
| QString suffix; |
| if (majorversion != -1) |
| suffix = QString::number(- majorversion); // negative so it prepends the dash |
| lib->setFileName(baseName + suffix); |
| #else |
| lib->setFileNameAndVersion(baseName, majorversion); |
| #endif |
| if (lib->load() && lib->resolve("dbus_connection_open_private")) |
| return true; |
| |
| lib->unload(); |
| } |
| } |
| |
| delete lib; |
| lib = 0; |
| return false; |
| #else |
| return true; |
| #endif |
| } |
| |
| void (*qdbus_resolve_conditionally(const char *name))() |
| { |
| #if QT_CONFIG(library) |
| if (qdbus_loadLibDBus()) |
| return qdbus_libdbus->resolve(name); |
| #else |
| Q_UNUSED(name); |
| #endif |
| return 0; |
| } |
| |
| void (*qdbus_resolve_me(const char *name))() |
| { |
| #if QT_CONFIG(library) |
| if (Q_UNLIKELY(!qdbus_loadLibDBus())) |
| qFatal("Cannot find libdbus-1 in your system to resolve symbol '%s'.", name); |
| |
| QFunctionPointer ptr = qdbus_libdbus->resolve(name); |
| if (Q_UNLIKELY(!ptr)) |
| qFatal("Cannot resolve '%s' in your libdbus-1.", name); |
| |
| return ptr; |
| #else |
| Q_UNUSED(name); |
| return 0; |
| #endif |
| } |
| |
| #else |
| static void qdbus_unloadLibDBus() |
| { |
| if (qEnvironmentVariableIsSet("QDBUS_FORCE_SHUTDOWN")) |
| dbus_shutdown(); |
| } |
| |
| #endif // !QT_LINKED_LIBDBUS |
| |
| #if defined(QT_LINKED_LIBDBUS) || QT_CONFIG(library) |
| Q_DESTRUCTOR_FUNCTION(qdbus_unloadLibDBus) |
| #endif |
| |
| QT_END_NAMESPACE |
| |
| #endif // QT_NO_DBUS |