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diff --git a/third_party/SingleApplication-3.3.0/singleapplication_p.h b/third_party/SingleApplication-3.3.0/singleapplication_p.h
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+// The MIT License (MIT)
+//
+// Copyright (c) Itay Grudev 2015 - 2020
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+//
+//  W A R N I N G !!!
+//  -----------------
+//
+// This file is not part of the SingleApplication API. It is used purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or may even be removed.
+//
+
+#ifndef SINGLEAPPLICATION_P_H
+#define SINGLEAPPLICATION_P_H
+
+#include <QtCore/QSharedMemory>
+#include <QtNetwork/QLocalServer>
+#include <QtNetwork/QLocalSocket>
+#include "singleapplication.h"
+
+struct InstancesInfo {
+    bool primary;
+    quint32 secondary;
+    qint64 primaryPid;
+    char primaryUser[128];
+    quint16 checksum; // Must be the last field
+};
+
+struct ConnectionInfo {
+    qint64 msgLen = 0;
+    quint32 instanceId = 0;
+    quint8 stage = 0;
+};
+
+class SingleApplicationPrivate : public QObject {
+Q_OBJECT
+public:
+    enum ConnectionType : quint8 {
+        InvalidConnection = 0,
+        NewInstance = 1,
+        SecondaryInstance = 2,
+        Reconnect = 3
+    };
+    enum ConnectionStage : quint8 {
+        StageInitHeader = 0,
+        StageInitBody = 1,
+        StageConnectedHeader = 2,
+        StageConnectedBody = 3,
+    };
+    Q_DECLARE_PUBLIC(SingleApplication)
+
+    SingleApplicationPrivate( SingleApplication *q_ptr );
+    ~SingleApplicationPrivate() override;
+
+    static QString getUsername();
+    void genBlockServerName();
+    void initializeMemoryBlock() const;
+    void startPrimary();
+    void startSecondary();
+    bool connectToPrimary( int msecs, ConnectionType connectionType );
+    quint16 blockChecksum() const;
+    qint64 primaryPid() const;
+    QString primaryUser() const;
+    bool isFrameComplete(QLocalSocket *sock);
+    void readMessageHeader(QLocalSocket *socket, ConnectionStage nextStage);
+    void readInitMessageBody(QLocalSocket *socket);
+    void writeAck(QLocalSocket *sock);
+    bool writeConfirmedFrame(int msecs, const QByteArray &msg);
+    bool writeConfirmedMessage(int msecs, const QByteArray &msg);
+    static void randomSleep();
+    void addAppData(const QString &data);
+    QStringList appData() const;
+
+    SingleApplication *q_ptr;
+    QSharedMemory *memory;
+    QLocalSocket *socket;
+    QLocalServer *server;
+    quint32 instanceNumber;
+    QString blockServerName;
+    SingleApplication::Options options;
+    QMap<QLocalSocket*, ConnectionInfo> connectionMap;
+    QStringList appDataList;
+
+public Q_SLOTS:
+    void slotConnectionEstablished();
+    void slotDataAvailable( QLocalSocket*, quint32 );
+    void slotClientConnectionClosed( QLocalSocket*, quint32 );
+};
+
+#endif // SINGLEAPPLICATION_P_H