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/****************************************************************************
**
** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB)
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 "lockfile.h"
#include "lockfile_p.h"
#include "utils.h"
#include <QCoreApplication>
#include <QDir>
#include <QFileInfo>
namespace KDUpdater {
bool LockFile::Private::lock()
{
if (locked)
return locked;
errorString.clear();
handle = CreateFile(filename.toStdWString().data(), GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ, NULL, QFileInfo(filename).exists() ? OPEN_EXISTING : CREATE_NEW,
FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE, NULL);
if (handle == INVALID_HANDLE_VALUE) {
errorString = QCoreApplication::translate("LockFile", "Cannot create lock file \"%1\": "
"%2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError()));
return false;
}
DWORD bytesWritten;
const QByteArray pid = QString::number(QCoreApplication::applicationPid()).toLatin1();
if (!WriteFile(handle, pid.data(), pid.size(), &bytesWritten, NULL)) {
errorString = QCoreApplication::translate("LockFile", "Cannot write PID to lock file "
"\"%1\": %2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError()));
return false;
}
FlushFileBuffers(handle);
if (!::LockFile(handle, 0, 0, QFileInfo(filename).size(), 0)) {
errorString = QCoreApplication::translate("LockFile", "Cannot obtain the lock for "
"file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError()));
} else {
locked = true;
}
return locked;
}
bool LockFile::Private::unlock()
{
errorString.clear();
if (!locked)
return true;
if (!UnlockFile(handle, 0, 0, QFileInfo(filename).size(), 0)) {
errorString = QCoreApplication::translate("LockFile", "Cannot release the lock for "
"file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError()));
} else {
locked = false;
CloseHandle(handle);
}
return !locked;
}
} // namespace KDUpdater
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