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-rw-r--r--src/libs/kdtools/kdlockfile_unix.cpp77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/libs/kdtools/kdlockfile_unix.cpp b/src/libs/kdtools/kdlockfile_unix.cpp
new file mode 100644
index 000000000..c40eb3b7d
--- /dev/null
+++ b/src/libs/kdtools/kdlockfile_unix.cpp
@@ -0,0 +1,77 @@
+/****************************************************************************
+** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB. All rights reserved.
+**
+** This file is part of the KD Tools library.
+**
+** Licensees holding valid commercial KD Tools licenses may use this file in
+** accordance with the KD Tools Commercial License Agreement provided with
+** the Software.
+**
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU Lesser General Public License version 2 and version 3 as published by the
+** Free Software Foundation and appearing in the file LICENSE.LGPL included.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** Contact info@kdab.com if any conditions of this licensing are not
+** clear to you.
+**
+**********************************************************************/
+
+#include "kdlockfile_p.h"
+
+#include <QtCore/QCoreApplication>
+
+#include <cerrno>
+
+#include <sys/file.h>
+
+KDLockFile::Private::~Private()
+{
+ unlock();
+}
+
+bool KDLockFile::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 = QObject::tr("Could not create lock file %1: %2").arg(filename, QLatin1String(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 = QObject::tr("Could not write PID to lock file %1: %2").arg( filename, QLatin1String( strerror( errno ) ) );
+ return false;
+ }
+ written += n;
+ }
+ errno = 0;
+ locked = flock(handle, LOCK_NB | LOCK_EX) != -1;
+ if (!locked)
+ errorString = QObject::tr("Could not lock lock file %1: %2").arg(filename, QLatin1String(strerror(errno)));
+ return locked;
+}
+
+bool KDLockFile::Private::unlock()
+{
+ errorString.clear();
+ if (!locked)
+ return true;
+ errno = 0;
+ locked = flock(handle, LOCK_UN | LOCK_NB) == -1;
+ if (locked)
+ errorString = QObject::tr("Could not unlock lock file %1: %2").arg(filename, QLatin1String(strerror(errno)));
+ return !locked;
+}