1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2013 David Faure <faure+bluesystems@kde.org> 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtCore module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef QLOCKFILE_P_H 41 #define QLOCKFILE_P_H 42 43 // 44 // W A R N I N G 45 // ------------- 46 // 47 // This file is not part of the Qt API. It exists purely as an 48 // implementation detail. This header file may change from version to 49 // version without notice, or even be removed. 50 // 51 // We mean it. 52 // 53 54 #include <QtCore/private/qglobal_p.h> 55 #include <QtCore/qlockfile.h> 56 #include <QtCore/qfile.h> 57 58 #include <qplatformdefs.h> 59 60 #ifdef Q_OS_WIN 61 #include <io.h> 62 #include <qt_windows.h> 63 #endif 64 65 QT_BEGIN_NAMESPACE 66 67 class QLockFilePrivate 68 { 69 public: QLockFilePrivate(const QString & fn)70 QLockFilePrivate(const QString &fn) 71 : fileName(fn), 72 #ifdef Q_OS_WIN 73 fileHandle(INVALID_HANDLE_VALUE), 74 #else 75 fileHandle(-1), 76 #endif 77 staleLockTime(30 * 1000), // 30 seconds 78 lockError(QLockFile::NoError), 79 isLocked(false) 80 { 81 } 82 QLockFile::LockError tryLock_sys(); 83 bool removeStaleLock(); 84 QByteArray lockFileContents() const; 85 // Returns \c true if the lock belongs to dead PID, or is old. 86 // The attempt to delete it will tell us if it was really stale or not, though. 87 bool isApparentlyStale() const; 88 89 // used in dbusmenu 90 Q_CORE_EXPORT static QString processNameByPid(qint64 pid); 91 static bool isProcessRunning(qint64 pid, const QString &appname); 92 93 QString fileName; 94 #ifdef Q_OS_WIN 95 Qt::HANDLE fileHandle; 96 #else 97 int fileHandle; 98 #endif 99 int staleLockTime; // "int milliseconds" is big enough for 24 days 100 QLockFile::LockError lockError; 101 bool isLocked; 102 getLockFileHandle(QLockFile * f)103 static int getLockFileHandle(QLockFile *f) 104 { 105 int fd; 106 #ifdef Q_OS_WIN 107 // Use of this function on Windows WILL leak a file descriptor. 108 fd = _open_osfhandle(intptr_t(f->d_func()->fileHandle), 0); 109 #else 110 fd = f->d_func()->fileHandle; 111 #endif 112 QT_LSEEK(fd, 0, SEEK_SET); 113 return fd; 114 } 115 }; 116 117 QT_END_NAMESPACE 118 119 #endif /* QLOCKFILE_P_H */ 120