1 files changed, 98 insertions, 0 deletions
diff --git a/src/libs/kdtools/lockfile_unix.cpp b/src/libs/kdtools/lockfile_unix.cpp
new file mode 100644
index 000000000..a024a842f
--- /dev/null
+++ b/src/libs/kdtools/lockfile_unix.cpp
@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB)
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Installer Framework.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "lockfile_p.h"
+
+#include <QCoreApplication>
+#include <QDir>
+
+#include <cerrno>
+#include <sys/file.h>
+#include <unistd.h>
+
+namespace KDUpdater {
+
+bool LockFile::Private::lock()
+{
+    if (locked)
+        return true;
+
+    errorString.clear();
+    errno = 0;
+    handle = open(filename.toLatin1().constData(), O_CREAT | O_RDWR | O_NONBLOCK, 0600);
+    if (handle == -1) {
+        errorString = QCoreApplication::translate("LockFile", "Cannot create lock file \"%1\": "
+            "%2").arg(QDir::toNativeSeparators(filename), QString::fromLocal8Bit(strerror(errno)));
+        return false;
+    }
+    const QString pid = QString::number(qApp->applicationPid());
+    const QByteArray data = pid.toLatin1();
+    errno = 0;
+    qint64 written = 0;
+    while (written < data.size()) {
+        const qint64 n = write(handle, data.constData() + written, data.size() - written);
+        if (n < 0) {
+            errorString = QCoreApplication::translate("LockFile", "Cannot write PID to lock "
+                "file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QString::fromLocal8Bit(strerror(errno)));
+            return false;
+        }
+        written += n;
+    }
+    errno = 0;
+    locked = flock(handle, LOCK_NB | LOCK_EX) != -1;
+    if (!locked) {
+        errorString = QCoreApplication::translate("LockFile", "Cannot obtain the lock for "
+            "file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QString::fromLocal8Bit(strerror(errno)));
+    }
+    return locked;
+}
+
+bool LockFile::Private::unlock()
+{
+    errorString.clear();
+    if (!locked)
+        return true;
+
+    errno = 0;
+    locked = flock(handle, LOCK_UN | LOCK_NB) == -1;
+    if (locked) {
+        errorString = QCoreApplication::translate("LockFile", "Cannot release the lock for "
+            "file \"%1\": %2").arg(QDir::toNativeSeparators(filename), QString::fromLocal8Bit(strerror(errno)));
+    } else {
+        unlink(filename.toLatin1());
+    }
+    return !locked;
+}
+
+} // namespace KDUpdater