qlockfile_p.h - mozsearch

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// Copyright (C) 2013 David Faure <faure+bluesystems@kde.org>

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

// Qt-Security score:significant reason:default

#ifndef QLOCKFILE_P_H

#define QLOCKFILE_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 <QtCore/qlockfile.h>

#include <QtCore/qfile.h>

#include <optional>

QT_BEGIN_NAMESPACE

class QLockFilePrivate

public:

    struct LockFileInfo

        qint64 pid;

        QString appname;

        QString hostname;

        QByteArray hostid;

        QByteArray bootid;

        QT_DEFINE_TAG_STRUCT(Current);

        LockFileInfo() = default;

        LockFileInfo(Current);

        QByteArray asFileContents() const;

};

    explicit QLockFilePrivate(const QString &fn);

    ~QLockFilePrivate();

    QLockFile::LockError tryLock_sys(const LockFileInfo &current);

    bool removeStaleLock();

    // Returns \c true if the lock belongs to dead PID, or is old.

    // The attempt to delete it will tell us if it was really stale or not, though.

    bool isApparentlyStale(const LockFileInfo &current) const;

    // used in dbusmenu

    Q_CORE_EXPORT static QString processNameByPid(qint64 pid);

    static bool isProcessRunning(qint64 pid, const QString &appname);

    QString fileName;

    static std::optional<LockFileInfo> getLockInfo_helper(const QString &fileName);

    static int openNewFileDescriptor(const QString &fileName);

#ifdef Q_OS_WIN

    Qt::HANDLE fileHandle = Qt::HANDLE(-1); // INVALID_HANDLE_VALUE

#else

    int fileHandle = -1;

    int dirHandle = -1;     // the directory where the file is located

#endif

    std::chrono::milliseconds staleLockTime = std::chrono::seconds{30};

    QLockFile::LockError lockError = QLockFile::NoError;

    bool isLocked = false;

    // used in tst_QLockFile:

    static auto getLockFileHandle(QLockFile *f)

        return f->d_func()->fileHandle;

};

QT_END_NAMESPACE

#endif /* QLOCKFILE_P_H */