diff options
Diffstat (limited to 'src/libs/kdtools/lockfile_win.cpp')
-rw-r--r-- | src/libs/kdtools/lockfile_win.cpp | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/libs/kdtools/lockfile_win.cpp b/src/libs/kdtools/lockfile_win.cpp new file mode 100644 index 000000000..20961cc4e --- /dev/null +++ b/src/libs/kdtools/lockfile_win.cpp @@ -0,0 +1,91 @@ +/**************************************************************************** +** +** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB) +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the Qt Installer Framework. +** +** $QT_BEGIN_LICENSE:GPL-EXCEPT$ +** 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. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3 as published by the Free Software +** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "lockfile.h" +#include "lockfile_p.h" + +#include "utils.h" + +#include <QCoreApplication> +#include <QDir> +#include <QFileInfo> + +namespace KDUpdater { + +bool LockFile::Private::lock() +{ + if (locked) + return locked; + + errorString.clear(); + handle = CreateFile(filename.toStdWString().data(), GENERIC_READ | GENERIC_WRITE, + FILE_SHARE_READ, NULL, QFileInfo(filename).exists() ? OPEN_EXISTING : CREATE_NEW, + FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE, NULL); + + if (handle == INVALID_HANDLE_VALUE) { + errorString = QCoreApplication::translate("LockFile", "Cannot create lock file \"%1\": " + "%2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError())); + return false; + } + + DWORD bytesWritten; + const QByteArray pid = QString::number(QCoreApplication::applicationPid()).toLatin1(); + if (!WriteFile(handle, pid.data(), pid.size(), &bytesWritten, NULL)) { + errorString = QCoreApplication::translate("LockFile", "Cannot write PID to lock file " + "\"%1\": %2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError())); + return false; + } + FlushFileBuffers(handle); + + if (!::LockFile(handle, 0, 0, QFileInfo(filename).size(), 0)) { + errorString = QCoreApplication::translate("LockFile", "Cannot obtain the lock for " + "file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError())); + } else { + locked = true; + } + return locked; +} + +bool LockFile::Private::unlock() +{ + errorString.clear(); + if (!locked) + return true; + + if (!UnlockFile(handle, 0, 0, QFileInfo(filename).size(), 0)) { + errorString = QCoreApplication::translate("LockFile", "Cannot release the lock for " + "file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QInstaller::windowsErrorString(GetLastError())); + } else { + locked = false; + CloseHandle(handle); + } + return !locked; +} + +} // namespace KDUpdater |