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/****************************************************************************
** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB. All rights reserved.
**
** This file is part of the KD Tools library.
**
** Licensees holding valid commercial KD Tools licenses may use this file in
** accordance with the KD Tools Commercial License Agreement provided with
** the Software.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU Lesser General Public License version 2 and version 3 as published by the
** Free Software Foundation and appearing in the file LICENSE.LGPL included.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@kdab.com if any conditions of this licensing are not
** clear to you.
**
**********************************************************************/
#include "kdlockfile_p.h"
#include <QtCore/QCoreApplication>
#include <cerrno>
#include <sys/file.h>
KDLockFile::Private::~Private()
{
unlock();
}
bool KDLockFile::Private::lock()
{
if ( locked )
return true;
errorString.clear();
errno = 0;
handle = open( filename.toLatin1().constData(), O_CREAT | O_RDWR | O_NONBLOCK );
if ( handle == -1 ) {
errorString = QObject::tr("Could not create lock file %1: %2").arg( filename, QLatin1String( strerror( errno ) ) );
return false;
}
const QString pid = QString::number( qApp->applicationPid() );
const QByteArray data = pid.toLatin1();
errno = 0;
qint64 written = 0;
while ( written < data.size() ) {
const qint64 n = write( handle, data.constData() + written, data.size() - written );
if ( n < 0 ) {
errorString = QObject::tr("Could not write PID to lock file %1: %2").arg( filename, QLatin1String( strerror( errno ) ) );
return false;
}
written += n;
}
errno = 0;
locked = flock( handle, LOCK_NB | LOCK_EX ) != -1;
if ( !locked )
errorString = QObject::tr("Could not lock lock file %1: %2").arg( filename, QLatin1String( strerror( errno ) ) );
return locked;
}
bool KDLockFile::Private::unlock()
{
errorString.clear();
if ( !locked )
return true;
errno = 0;
locked = flock( handle, LOCK_UN | LOCK_NB ) == -1;
if ( locked )
errorString = QObject::tr("Could not unlock lock file %1: %2").arg( filename, QLatin1String( strerror( errno ) ) );
return !locked;
}
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