d5/d4f/qdbus__symbols_8cpp_source.html

// Copyright (C) 2016 The Qt Company Ltd.

// Copyright (C) 2016 Intel Corporation.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only


#include <QtCore/qglobal.h>

#include <QtCore/qlatin1stringview.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


using namespace Qt::StringLiterals;


void (*qdbus_resolve_me(const char *name))();


#if !defined QT_LINKED_LIBDBUS


#if QT_CONFIG(library)

Q_CONSTINIT static QLibrary *qdbus_libdbus = nullptr;


void qdbus_unloadLibDBus()

{

    if (qdbus_libdbus) {

        if (qEnvironmentVariableIsSet("QDBUS_FORCE_SHUTDOWN"))

            qdbus_libdbus->resolve("dbus_shutdown")();

        qdbus_libdbus->unload();

    }

    delete qdbus_libdbus;

    qdbus_libdbus = nullptr;

}

#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


    Q_CONSTINIT static bool triedToLoadLibrary = false;

    Q_CONSTINIT 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

        "dbus-1"_L1,

#endif

        "libdbus-1"_L1

    };


    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 = nullptr;

    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 nullptr;

}


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 nullptr;

#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

QLibrary
\inmodule QtCore \reentrant
Definition qlibrary.h:17

QLibrary::load
bool load()
Loads the library and returns true if the library was loaded successfully; otherwise returns false.
Definition qlibrary.cpp:806

QLibrary::ExportExternalSymbolsHint
@ ExportExternalSymbolsHint
Definition qlibrary.h:24

QLibrary::setFileNameAndVersion
void setFileNameAndVersion(const QString &fileName, int verNum)
Sets the fileName property and major version number to fileName and versionNumber respectively.
Definition qlibrary.cpp:969

QLibrary::setFileName
void setFileName(const QString &fileName)
Definition qlibrary.cpp:946

QLibrary::isLoaded
bool isLoaded() const
Returns true if load() succeeded; otherwise returns false.
Definition qlibrary.cpp:852

QLibrary::unload
bool unload()
Unloads the library and returns true if the library could be unloaded; otherwise returns false.
Definition qlibrary.cpp:834

QLibrary::setLoadHints
void setLoadHints(LoadHints hints)
Definition qlibrary.cpp:1136

QLibrary::resolve
QFunctionPointer resolve(const char *symbol)
Returns the address of the exported symbol symbol.
Definition qlibrary.cpp:1014

QMutex
\inmodule QtCore
Definition qmutex.h:285

QString
\macro QT_RESTRICTED_CAST_FROM_ASCII
Definition qstring.h:127

QString::number
static QString number(int, int base=10)
This is an overloaded member function, provided for convenience. It differs from the above function o...
Definition qstring.cpp:7822

QT_BEGIN_NAMESPACE
Combined button and popup list for selecting options.
Definition qstandardpaths_haiku.cpp:21

QT_END_NAMESPACE
Definition qsharedpointer.cpp:1545

Qt::StringLiterals
Definition qbytearray.h:716

Q_UNLIKELY
#define Q_UNLIKELY(x)
Definition qcompilerdetection.h:1006

qdbus_loadLibDBus
bool qdbus_loadLibDBus()
Definition qdbus_symbols.cpp:40

qdbus_resolve_me
void(*)() qdbus_resolve_me(const char *name)
Definition qdbus_symbols.cpp:21

dbus_shutdown
void dbus_shutdown()

qdbus_resolve_conditionally
void(*)() qdbus_resolve_conditionally(const char *name)
Definition qdbus_symbols.cpp:95

void
DBusConnection const char DBusError DBusBusType DBusError return DBusConnection DBusHandleMessageFunction void DBusFreeFunction return DBusConnection return DBusConnection return const char DBusError return DBusConnection DBusMessage dbus_uint32_t return DBusConnection dbus_bool_t DBusConnection DBusAddWatchFunction DBusRemoveWatchFunction DBusWatchToggledFunction void DBusFreeFunction return DBusConnection DBusDispatchStatusFunction void DBusFreeFunction DBusTimeout return DBusTimeout return DBusWatch return DBusWatch unsigned int return DBusError const DBusError return const DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessage return DBusMessageIter int const void return DBusMessageIter DBusMessageIter return DBusMessageIter void DBusMessageIter void int return DBusMessage DBusMessageIter return DBusMessageIter return DBusMessageIter DBusMessageIter const char const char const char const char return DBusMessage return DBusMessage const char return DBusMessage dbus_bool_t return DBusMessage dbus_uint32_t return DBusMessage void
Definition qdbus_symbols_p.h:401

qFatal
#define qFatal
Definition qlogging.h:164

ptr
static ControlElement< T > * ptr(QWidget *widget)
Definition qmdisubwindow.cpp:223

name
GLuint name
Definition qopengles2ext.h:156

qEnvironmentVariableIsEmpty
Q_CORE_EXPORT bool qEnvironmentVariableIsEmpty(const char *varName) noexcept

qEnvironmentVariableIsSet
Q_CORE_EXPORT bool qEnvironmentVariableIsSet(const char *varName) noexcept

Q_UNUSED
#define Q_UNUSED(x)
Definition qtpreprocessorsupport.h:20

mutex
QMutex mutex
[2]
Definition src_corelib_thread_qmutex.cpp:49