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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtNetwork 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qlocalserver.h"
#include "qlocalserver_p.h"
#include "qlocalsocket.h"
#include <qdebug.h>
// The buffer size need to be 0 otherwise data could be
// lost if the socket that has written data closes the connection
// before it is read. Pipewriter is used for write buffering.
#define BUFSIZE 0
// ###: This should be a property. Should replace the insane 50 on unix as well.
#define SYSTEM_MAX_PENDING_SOCKETS 8
QT_BEGIN_NAMESPACE
bool QLocalServerPrivate::addListener()
{
// The object must not change its address once the
// contained OVERLAPPED struct is passed to Windows.
listeners << Listener();
Listener &listener = listeners.last();
listener.handle = CreateNamedPipe(
(const wchar_t *)fullServerName.utf16(), // pipe name
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, // read/write access
PIPE_TYPE_BYTE | // byte type pipe
PIPE_READMODE_BYTE | // byte-read mode
PIPE_WAIT, // blocking mode
PIPE_UNLIMITED_INSTANCES, // max. instances
BUFSIZE, // output buffer size
BUFSIZE, // input buffer size
3000, // client time-out
NULL);
if (listener.handle == INVALID_HANDLE_VALUE) {
setError(QLatin1String("QLocalServerPrivate::addListener"));
listeners.removeLast();
return false;
}
memset(&listener.overlapped, 0, sizeof(listener.overlapped));
listener.overlapped.hEvent = eventHandle;
if (!ConnectNamedPipe(listener.handle, &listener.overlapped)) {
switch (GetLastError()) {
case ERROR_IO_PENDING:
listener.connected = false;
break;
case ERROR_PIPE_CONNECTED:
listener.connected = true;
SetEvent(eventHandle);
break;
default:
CloseHandle(listener.handle);
setError(QLatin1String("QLocalServerPrivate::addListener"));
listeners.removeLast();
return false;
}
} else {
Q_ASSERT_X(false, "QLocalServerPrivate::addListener", "The impossible happened");
SetEvent(eventHandle);
}
return true;
}
void QLocalServerPrivate::setError(const QString &function)
{
int windowsError = GetLastError();
errorString = QString::fromLatin1("%1: %2").arg(function).arg(qt_error_string(windowsError));
error = QAbstractSocket::UnknownSocketError;
}
void QLocalServerPrivate::init()
{
}
bool QLocalServerPrivate::removeServer(const QString &name)
{
Q_UNUSED(name);
return true;
}
bool QLocalServerPrivate::listen(const QString &name)
{
Q_Q(QLocalServer);
QString pipePath = QLatin1String("\\\\.\\pipe\\");
if (name.startsWith(pipePath))
fullServerName = name;
else
fullServerName = pipePath + name;
// Use only one event for all listeners of one socket.
// The idea is that listener events are rare, so polling all listeners once in a while is
// cheap compared to waiting for N additional events in each iteration of the main loop.
eventHandle = CreateEvent(NULL, TRUE, FALSE, NULL);
connectionEventNotifier = new QWinEventNotifier(eventHandle , q);
q->connect(connectionEventNotifier, SIGNAL(activated(HANDLE)), q, SLOT(_q_onNewConnection()));
for (int i = 0; i < SYSTEM_MAX_PENDING_SOCKETS; ++i)
if (!addListener())
return false;
return true;
}
void QLocalServerPrivate::_q_onNewConnection()
{
Q_Q(QLocalServer);
DWORD dummy;
// Reset first, otherwise we could reset an event which was asserted
// immediately after we checked the conn status.
ResetEvent(eventHandle);
// Testing shows that there is indeed absolutely no guarantee which listener gets
// a client connection first, so there is no way around polling all of them.
for (int i = 0; i < listeners.size(); ) {
HANDLE handle = listeners[i].handle;
if (listeners[i].connected
|| GetOverlappedResult(handle, &listeners[i].overlapped, &dummy, FALSE))
{
listeners.removeAt(i);
addListener();
if (pendingConnections.size() > maxPendingConnections)
connectionEventNotifier->setEnabled(false);
// Make this the last thing so connected slots can wreak the least havoc
q->incomingConnection((quintptr)handle);
} else {
if (GetLastError() != ERROR_IO_INCOMPLETE) {
q->close();
setError(QLatin1String("QLocalServerPrivate::_q_onNewConnection"));
return;
}
++i;
}
}
}
void QLocalServerPrivate::closeServer()
{
connectionEventNotifier->setEnabled(false); // Otherwise, closed handle is checked before deleter runs
connectionEventNotifier->deleteLater();
connectionEventNotifier = 0;
CloseHandle(eventHandle);
for (int i = 0; i < listeners.size(); ++i)
CloseHandle(listeners[i].handle);
listeners.clear();
}
void QLocalServerPrivate::waitForNewConnection(int msecs, bool *timedOut)
{
Q_Q(QLocalServer);
if (!pendingConnections.isEmpty() || !q->isListening())
return;
DWORD result = WaitForSingleObject(eventHandle, (msecs == -1) ? INFINITE : msecs);
if (result == WAIT_TIMEOUT) {
if (timedOut)
*timedOut = true;
} else {
_q_onNewConnection();
}
}
QT_END_NAMESPACE
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