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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsharedmemory.h"
#include "qsharedmemory_p.h"
#include "qcore_symbian_p.h"
#include <qdebug.h>
#ifndef QT_NO_SHAREDMEMORY
#define QSHAREDMEMORY_DEBUG
QT_BEGIN_NAMESPACE
QSharedMemoryPrivate::QSharedMemoryPrivate()
: QObjectPrivate(), memory(0), size(0), error(QSharedMemory::NoError),
#ifndef QT_NO_SYSTEMSEMAPHORE
systemSemaphore(QString()), lockedByMe(false)
#endif
{
}
void QSharedMemoryPrivate::setErrorString(const QString &function, TInt errorCode)
{
if (errorCode == KErrNone)
return;
switch (errorCode) {
case KErrAlreadyExists:
error = QSharedMemory::AlreadyExists;
errorString = QSharedMemory::tr("%1: already exists").arg(function);
break;
case KErrNotFound:
error = QSharedMemory::NotFound;
errorString = QSharedMemory::tr("%1: doesn't exists").arg(function);
break;
case KErrArgument:
error = QSharedMemory::InvalidSize;
errorString = QSharedMemory::tr("%1: invalid size").arg(function);
break;
case KErrNoMemory:
error = QSharedMemory::OutOfResources;
errorString = QSharedMemory::tr("%1: out of resources").arg(function);
break;
case KErrPermissionDenied:
error = QSharedMemory::PermissionDenied;
errorString = QSharedMemory::tr("%1: permission denied").arg(function);
break;
default:
errorString = QSharedMemory::tr("%1: unknown error %2").arg(function).arg(errorCode);
error = QSharedMemory::UnknownError;
#if defined QSHAREDMEMORY_DEBUG
qDebug() << errorString << "key" << key;
#endif
break;
}
}
key_t QSharedMemoryPrivate::handle()
{
// don't allow making handles on empty keys
if (nativeKey.isEmpty()) {
error = QSharedMemory::KeyError;
errorString = QSharedMemory::tr("%1: key is empty").arg(QLatin1String("QSharedMemory::handle"));
return 0;
}
// Not really cost effective to check here if shared memory is attachable, as it requires
// exactly the same call as attaching, so always assume handle is valid and return failure
// from attach.
return 1;
}
void QSharedMemoryPrivate::cleanHandle()
{
chunk.Close();
}
bool QSharedMemoryPrivate::create(int size)
{
if (!handle())
return false;
TPtrC ptr(qt_QString2TPtrC(nativeKey));
TInt err = chunk.CreateGlobal(ptr, size, size);
if (err != KErrNone) {
setErrorString(QLatin1String("QSharedMemory::create"), err);
return false;
}
// Zero out the created chunk
Mem::FillZ(chunk.Base(), chunk.Size());
return true;
}
bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode /* mode */)
{
// Grab a pointer to the memory block
if (!chunk.Handle()) {
if (!handle())
return false;
TPtrC ptr(qt_QString2TPtrC(nativeKey));
TInt err = KErrNoMemory;
err = chunk.OpenGlobal(ptr, false);
if (err != KErrNone) {
setErrorString(QLatin1String("QSharedMemory::attach"), err);
return false;
}
}
size = chunk.Size();
memory = chunk.Base();
return true;
}
bool QSharedMemoryPrivate::detach()
{
chunk.Close();
memory = 0;
size = 0;
return true;
}
QT_END_NAMESPACE
#endif //QT_NO_SHAREDMEMORY
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