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diff --git a/src/serialport/qwinoverlappedionotifier_p.h b/src/serialport/qwinoverlappedionotifier_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2022 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:COMM$
+**
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** $QT_END_LICENSE$
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+**
+****************************************************************************/
+
+#ifndef QWINOVERLAPPEDIONOTIFIER_P_H
+#define QWINOVERLAPPEDIONOTIFIER_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 <QtCore/private/qglobal_p.h>
+#include <qobject.h>
+#include <qdeadlinetimer.h>
+
+typedef struct _OVERLAPPED OVERLAPPED;
+
+QT_BEGIN_NAMESPACE
+
+class QWinOverlappedIoNotifierPrivate;
+
+class QWinOverlappedIoNotifier : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(QWinOverlappedIoNotifier)
+    Q_DECLARE_PRIVATE(QWinOverlappedIoNotifier)
+    Q_PRIVATE_SLOT(d_func(), void _q_notified())
+    friend class QWinIoCompletionPort;
+public:
+    QWinOverlappedIoNotifier(QObject *parent = 0);
+    ~QWinOverlappedIoNotifier();
+
+    void setHandle(Qt::HANDLE h);
+    Qt::HANDLE handle() const;
+
+    void setEnabled(bool enabled);
+    OVERLAPPED *waitForAnyNotified(QDeadlineTimer deadline);
+    bool waitForNotified(QDeadlineTimer deadline, OVERLAPPED *overlapped);
+
+Q_SIGNALS:
+    void notified(quint32 numberOfBytes, quint32 errorCode, OVERLAPPED *overlapped);
+#if !defined(Q_QDOC)
+    void _q_notify();
+#endif
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINOVERLAPPEDIONOTIFIER_P_H