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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcfsocketnotifier_p.h"
#include <QtGui/qguiapplication.h>
#include <QtCore/qsocketnotifier.h>
#include <QtCore/qthread.h>
/**************************************************************************
Socket Notifiers
*************************************************************************/
void qt_mac_socket_callback(CFSocketRef s, CFSocketCallBackType callbackType, CFDataRef,
const void *, void *info)
{
QCFSocketNotifier *cfSocketNotifier = static_cast<QCFSocketNotifier *>(info);
int nativeSocket = CFSocketGetNative(s);
MacSocketInfo *socketInfo = cfSocketNotifier->macSockets.value(nativeSocket);
QEvent notifierEvent(QEvent::SockAct);
// There is a race condition that happen where we disable the notifier and
// the kernel still has a notification to pass on. We then get this
// notification after we've successfully disabled the CFSocket, but our Qt
// notifier is now gone. The upshot is we have to check the notifier
// every time.
if (callbackType == kCFSocketReadCallBack) {
if (socketInfo->readNotifier)
QGuiApplication::sendEvent(socketInfo->readNotifier, ¬ifierEvent);
} else if (callbackType == kCFSocketWriteCallBack) {
if (socketInfo->writeNotifier)
QGuiApplication::sendEvent(socketInfo->writeNotifier, ¬ifierEvent);
}
if (cfSocketNotifier->maybeCancelWaitForMoreEvents)
cfSocketNotifier->maybeCancelWaitForMoreEvents(cfSocketNotifier->eventDispatcher);
}
/*
Adds a loop source for the given socket to the current run loop.
*/
CFRunLoopSourceRef qt_mac_add_socket_to_runloop(const CFSocketRef socket)
{
CFRunLoopSourceRef loopSource = CFSocketCreateRunLoopSource(kCFAllocatorDefault, socket, 0);
if (!loopSource)
return 0;
CFRunLoopAddSource(CFRunLoopGetMain(), loopSource, kCFRunLoopCommonModes);
return loopSource;
}
/*
Removes the loop source for the given socket from the current run loop.
*/
void qt_mac_remove_socket_from_runloop(const CFSocketRef socket, CFRunLoopSourceRef runloop)
{
Q_ASSERT(runloop);
CFRunLoopRemoveSource(CFRunLoopGetMain(), runloop, kCFRunLoopCommonModes);
CFSocketDisableCallBacks(socket, kCFSocketReadCallBack);
CFSocketDisableCallBacks(socket, kCFSocketWriteCallBack);
CFRunLoopSourceInvalidate(runloop);
}
QCFSocketNotifier::QCFSocketNotifier()
:eventDispatcher(0)
, maybeCancelWaitForMoreEvents(0)
{
}
QCFSocketNotifier::~QCFSocketNotifier()
{
}
void QCFSocketNotifier::setHostEventDispatcher(QAbstractEventDispatcher *hostEventDispacher)
{
eventDispatcher = hostEventDispacher;
}
void QCFSocketNotifier::setMaybeCancelWaitForMoreEventsCallback(MaybeCancelWaitForMoreEventsFn callBack)
{
maybeCancelWaitForMoreEvents = callBack;
}
void QCFSocketNotifier::registerSocketNotifier(QSocketNotifier *notifier)
{
Q_ASSERT(notifier);
int nativeSocket = notifier->socket();
int type = notifier->type();
#ifndef QT_NO_DEBUG
if (nativeSocket < 0 || nativeSocket > FD_SETSIZE) {
qWarning("QSocketNotifier: Internal error");
return;
} else if (notifier->thread() != eventDispatcher->thread()
|| eventDispatcher->thread() != QThread::currentThread()) {
qWarning("QSocketNotifier: socket notifiers cannot be enabled from another thread");
return;
}
#endif
if (type == QSocketNotifier::Exception) {
qWarning("QSocketNotifier::Exception is not supported on iOS");
return;
}
// Check if we have a CFSocket for the native socket, create one if not.
MacSocketInfo *socketInfo = macSockets.value(nativeSocket);
if (!socketInfo) {
socketInfo = new MacSocketInfo();
// Create CFSocket, specify that we want both read and write callbacks (the callbacks
// are enabled/disabled later on).
const int callbackTypes = kCFSocketReadCallBack | kCFSocketWriteCallBack;
CFSocketContext context = {0, this, 0, 0, 0};
socketInfo->socket = CFSocketCreateWithNative(kCFAllocatorDefault, nativeSocket, callbackTypes, qt_mac_socket_callback, &context);
if (CFSocketIsValid(socketInfo->socket) == false) {
qWarning("QEventDispatcherMac::registerSocketNotifier: Failed to create CFSocket");
return;
}
CFOptionFlags flags = CFSocketGetSocketFlags(socketInfo->socket);
flags |= kCFSocketAutomaticallyReenableWriteCallBack; //QSocketNotifier stays enabled after a write
flags &= ~kCFSocketCloseOnInvalidate; //QSocketNotifier doesn't close the socket upon destruction/invalidation
CFSocketSetSocketFlags(socketInfo->socket, flags);
// Add CFSocket to runloop.
if (!(socketInfo->runloop = qt_mac_add_socket_to_runloop(socketInfo->socket))) {
qWarning("QEventDispatcherMac::registerSocketNotifier: Failed to add CFSocket to runloop");
CFSocketInvalidate(socketInfo->socket);
CFRelease(socketInfo->socket);
return;
}
// Disable both callback types by default. This must be done after
// we add the CFSocket to the runloop, or else these calls will have
// no effect.
CFSocketDisableCallBacks(socketInfo->socket, kCFSocketReadCallBack);
CFSocketDisableCallBacks(socketInfo->socket, kCFSocketWriteCallBack);
macSockets.insert(nativeSocket, socketInfo);
}
// Increment read/write counters and select enable callbacks if necessary.
if (type == QSocketNotifier::Read) {
Q_ASSERT(socketInfo->readNotifier == 0);
socketInfo->readNotifier = notifier;
CFSocketEnableCallBacks(socketInfo->socket, kCFSocketReadCallBack);
} else if (type == QSocketNotifier::Write) {
Q_ASSERT(socketInfo->writeNotifier == 0);
socketInfo->writeNotifier = notifier;
CFSocketEnableCallBacks(socketInfo->socket, kCFSocketWriteCallBack);
}
}
void QCFSocketNotifier::unregisterSocketNotifier(QSocketNotifier *notifier)
{
Q_ASSERT(notifier);
int nativeSocket = notifier->socket();
int type = notifier->type();
#ifndef QT_NO_DEBUG
if (nativeSocket < 0 || nativeSocket > FD_SETSIZE) {
qWarning("QSocketNotifier: Internal error");
return;
} else if (notifier->thread() != eventDispatcher->thread() || eventDispatcher->thread() != QThread::currentThread()) {
qWarning("QSocketNotifier: socket notifiers cannot be disabled from another thread");
return;
}
#endif
if (type == QSocketNotifier::Exception) {
qWarning("QSocketNotifier::Exception is not supported on iOS");
return;
}
MacSocketInfo *socketInfo = macSockets.value(nativeSocket);
if (!socketInfo) {
qWarning("QEventDispatcherMac::unregisterSocketNotifier: Tried to unregister a not registered notifier");
return;
}
// Decrement read/write counters and disable callbacks if necessary.
if (type == QSocketNotifier::Read) {
Q_ASSERT(notifier == socketInfo->readNotifier);
socketInfo->readNotifier = 0;
CFSocketDisableCallBacks(socketInfo->socket, kCFSocketReadCallBack);
} else if (type == QSocketNotifier::Write) {
Q_ASSERT(notifier == socketInfo->writeNotifier);
socketInfo->writeNotifier = 0;
CFSocketDisableCallBacks(socketInfo->socket, kCFSocketWriteCallBack);
}
// Remove CFSocket from runloop if this was the last QSocketNotifier.
if (socketInfo->readNotifier == 0 && socketInfo->writeNotifier == 0) {
if (CFSocketIsValid(socketInfo->socket))
qt_mac_remove_socket_from_runloop(socketInfo->socket, socketInfo->runloop);
CFRunLoopSourceInvalidate(socketInfo->runloop);
CFRelease(socketInfo->runloop);
CFSocketInvalidate(socketInfo->socket);
CFRelease(socketInfo->socket);
delete socketInfo;
macSockets.remove(nativeSocket);
}
}
void QCFSocketNotifier::removeSocketNotifiers()
{
// Remove CFSockets from the runloop.
for (MacSocketHash::ConstIterator it = macSockets.constBegin(); it != macSockets.constEnd(); ++it) {
MacSocketInfo *socketInfo = (*it);
if (CFSocketIsValid(socketInfo->socket)) {
qt_mac_remove_socket_from_runloop(socketInfo->socket, socketInfo->runloop);
CFRunLoopSourceInvalidate(socketInfo->runloop);
CFRelease(socketInfo->runloop);
CFSocketInvalidate(socketInfo->socket);
CFRelease(socketInfo->socket);
}
}
}
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