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/****************************************************************************
**
** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB)
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 "kdlockfile.h"
#include "kdlockfile_p.h"
#include <QtCore/QCoreApplication>
#include <QtCore/QFileInfo>
KDLockFile::Private::~Private()
{
unlock();
}
bool KDLockFile::Private::lock()
{
const QFileInfo fi(filename);
handle = CreateFile(filename.toStdWString().data(),
GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ,
NULL, fi.exists() ? OPEN_EXISTING : CREATE_NEW,
FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE, NULL);
if (!handle)
return false;
QString pid = QString::number(qApp->applicationPid());
QByteArray data = pid.toLatin1();
DWORD bytesWritten;
const bool wrotePid = WriteFile(handle, data.data(), data.size(), &bytesWritten, NULL);
if (!wrotePid)
return false;
FlushFileBuffers(handle);
const bool locked = LockFile(handle, 0, 0, fi.size(), 0);
this->locked = locked;
return locked;
}
bool KDLockFile::Private::unlock()
{
const QFileInfo fi(filename);
if (locked) {
const bool success = UnlockFile(handle, 0, 0, 0, fi.size());
this->locked = !success;
CloseHandle(handle);
return success;
}
return true;
}
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