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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QSHAREDMEMORY_P_H
#define QSHAREDMEMORY_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qsharedmemory.h"
#include <QtCore/qstring.h>
#if !QT_CONFIG(sharedmemory)
# if QT_CONFIG(systemsemaphore)
QT_BEGIN_NAMESPACE
namespace QSharedMemoryPrivate
{
int createUnixKeyFile(const QString &fileName);
QString makePlatformSafeKey(const QString &key,
const QString &prefix = QStringLiteral("qipc_sharedmemory_"));
}
QT_END_NAMESPACE
# endif
#else
#include "qsystemsemaphore.h"
#include "private/qobject_p.h"
#if !defined(Q_OS_WIN) && !defined(Q_OS_ANDROID) && !defined(Q_OS_INTEGRITY) && !defined(Q_OS_RTEMS)
# include <sys/sem.h>
#endif
QT_BEGIN_NAMESPACE
#if QT_CONFIG(systemsemaphore)
/*!
Helper class
*/
class QSharedMemoryLocker
{
public:
inline QSharedMemoryLocker(QSharedMemory *sharedMemory) : q_sm(sharedMemory)
{
Q_ASSERT(q_sm);
}
inline ~QSharedMemoryLocker()
{
if (q_sm)
q_sm->unlock();
}
inline bool lock()
{
if (q_sm && q_sm->lock())
return true;
q_sm = nullptr;
return false;
}
private:
QSharedMemory *q_sm;
};
#endif // QT_CONFIG(systemsemaphore)
class Q_AUTOTEST_EXPORT QSharedMemoryPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QSharedMemory)
public:
void *memory = nullptr;
qsizetype size = 0;
QString key;
QString nativeKey;
QSharedMemory::SharedMemoryError error = QSharedMemory::NoError;
QString errorString;
#if QT_CONFIG(systemsemaphore)
QSystemSemaphore systemSemaphore{QString()};
bool lockedByMe = false;
#endif
static int createUnixKeyFile(const QString &fileName);
static QString makePlatformSafeKey(const QString &key,
const QString &prefix = QStringLiteral("qipc_sharedmemory_"));
#ifdef Q_OS_WIN
Qt::HANDLE handle();
#elif defined(QT_POSIX_IPC)
int handle();
#else
key_t handle();
#endif
bool initKey();
bool cleanHandle();
bool create(qsizetype size);
bool attach(QSharedMemory::AccessMode mode);
bool detach();
void setErrorString(QLatin1StringView function);
#if QT_CONFIG(systemsemaphore)
bool tryLocker(QSharedMemoryLocker *locker, const QString &function) {
if (!locker->lock()) {
errorString = QSharedMemory::tr("%1: unable to lock").arg(function);
error = QSharedMemory::LockError;
return false;
}
return true;
}
#endif // QT_CONFIG(systemsemaphore)
private:
#ifdef Q_OS_WIN
Qt::HANDLE hand = nullptr;
#elif defined(QT_POSIX_IPC)
int hand = -1;
#else
key_t unix_key = 0;
#endif
};
QT_END_NAMESPACE
#endif // QT_CONFIG(sharedmemory)
#endif // QSHAREDMEMORY_P_H
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