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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
* Copyright (c) 2010 University of Szeged
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "SharedMemory.h"
#include "ArgumentDecoder.h"
#include "ArgumentEncoder.h"
#include "CleanupHandler.h"
#include "WebCoreArgumentCoders.h"
#include <unistd.h>
#include <QCoreApplication>
#include <QLatin1String>
#include <QSharedMemory>
#include <QString>
#include <QUuid>
#include <wtf/Assertions.h>
#include <wtf/CurrentTime.h>
namespace WebKit {
SharedMemory::Handle::Handle()
: m_key()
, m_size(0)
{
}
SharedMemory::Handle::~Handle()
{
}
bool SharedMemory::Handle::isNull() const
{
return m_key.isNull();
}
void SharedMemory::Handle::encode(CoreIPC::ArgumentEncoder* encoder) const
{
encoder->encodeUInt64(m_size);
encoder->encode(m_key);
m_key = String();
}
bool SharedMemory::Handle::decode(CoreIPC::ArgumentDecoder* decoder, Handle& handle)
{
ASSERT_ARG(handle, !handle.m_size);
ASSERT_ARG(handle, handle.m_key.isNull());
uint64_t size;
if (!decoder->decodeUInt64(size))
return false;
String key;
if (!decoder->decode(key))
return false;
handle.m_size = size;
handle.m_key = key;
return true;
}
static QString createUniqueKey()
{
return QLatin1String("QWKSharedMemoryKey") + QUuid::createUuid().toString();
}
PassRefPtr<SharedMemory> SharedMemory::create(size_t size)
{
RefPtr<SharedMemory> sharedMemory(adoptRef(new SharedMemory));
QSharedMemory* impl = new QSharedMemory(createUniqueKey());
bool created = impl->create(size);
ASSERT_UNUSED(created, created);
sharedMemory->m_impl = impl;
sharedMemory->m_size = size;
sharedMemory->m_data = impl->data();
// Do not leave the shared memory segment behind.
CleanupHandler::instance()->markForCleanup(impl);
return sharedMemory.release();
}
static inline QSharedMemory::AccessMode accessMode(SharedMemory::Protection protection)
{
switch (protection) {
case SharedMemory::ReadOnly:
return QSharedMemory::ReadOnly;
case SharedMemory::ReadWrite:
return QSharedMemory::ReadWrite;
}
ASSERT_NOT_REACHED();
return QSharedMemory::ReadWrite;
}
PassRefPtr<SharedMemory> SharedMemory::create(const Handle& handle, Protection protection)
{
if (handle.isNull())
return 0;
QSharedMemory* impl = new QSharedMemory(QString(handle.m_key));
bool attached = impl->attach(accessMode(protection));
if (!attached) {
delete impl;
return 0;
}
RefPtr<SharedMemory> sharedMemory(adoptRef(new SharedMemory));
sharedMemory->m_impl = impl;
ASSERT(handle.m_size == impl->size());
sharedMemory->m_size = handle.m_size;
sharedMemory->m_data = impl->data();
// Do not leave the shared memory segment behind.
CleanupHandler::instance()->markForCleanup(impl);
return sharedMemory.release();
}
SharedMemory::~SharedMemory()
{
if (CleanupHandler::instance()->hasStartedDeleting())
return;
CleanupHandler::instance()->unmark(m_impl);
delete m_impl;
}
bool SharedMemory::createHandle(Handle& handle, Protection protection)
{
ASSERT_ARG(handle, handle.m_key.isNull());
ASSERT_ARG(handle, !handle.m_size);
QString key = m_impl->key();
if (key.isNull())
return false;
handle.m_key = String(key);
handle.m_size = m_size;
return true;
}
unsigned SharedMemory::systemPageSize()
{
static unsigned pageSize = 0;
if (!pageSize)
pageSize = getpagesize();
return pageSize;
}
} // namespace WebKit
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