1// Copyright (C) 2013 David Faure <faure+bluesystems@kde.org>
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QLOCKFILE_P_H
5#define QLOCKFILE_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <QtCore/private/qglobal_p.h>
19#include <QtCore/qlockfile.h>
20#include <QtCore/qfile.h>
21
22#include <qplatformdefs.h>
23
24#ifdef Q_OS_WIN
25#include <io.h>
26#include <qt_windows.h>
27#endif
28
29QT_BEGIN_NAMESPACE
30
31class QLockFilePrivate
32{
33public:
34 QLockFilePrivate(const QString &fn)
35 : fileName(fn)
36 {
37 }
38 QLockFile::LockError tryLock_sys();
39 bool removeStaleLock();
40 QByteArray lockFileContents() const;
41 // Returns \c true if the lock belongs to dead PID, or is old.
42 // The attempt to delete it will tell us if it was really stale or not, though.
43 bool isApparentlyStale() const;
44
45 // used in dbusmenu
46 Q_CORE_EXPORT static QString processNameByPid(qint64 pid);
47 static bool isProcessRunning(qint64 pid, const QString &appname);
48
49 QString fileName;
50
51#ifdef Q_OS_WIN
52 Qt::HANDLE fileHandle = INVALID_HANDLE_VALUE;
53#else
54 int fileHandle = -1;
55#endif
56
57 std::chrono::milliseconds staleLockTime = std::chrono::seconds{30};
58 QLockFile::LockError lockError = QLockFile::NoError;
59 bool isLocked = false;
60
61 static int getLockFileHandle(QLockFile *f)
62 {
63 int fd;
64#ifdef Q_OS_WIN
65 // Use of this function on Windows WILL leak a file descriptor.
66 fd = _open_osfhandle(intptr_t(f->d_func()->fileHandle), 0);
67#else
68 fd = f->d_func()->fileHandle;
69#endif
70 QT_LSEEK(fd: fd, offset: 0, SEEK_SET);
71 return fd;
72 }
73};
74
75QT_END_NAMESPACE
76
77#endif /* QLOCKFILE_P_H */
78

source code of qtbase/src/corelib/io/qlockfile_p.h