From 412855ae3d967ff81a383688397c4d9448a4ee15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Mr=C3=A1zek?= <peterix@gmail.com>
Date: Sun, 30 Oct 2016 02:37:38 +0100
Subject: NOISSUE refactor window management and launch, make MultiMC a single
 instance application.

---
 libraries/LocalPeer/src/LockedFile_unix.cpp | 114 ++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 libraries/LocalPeer/src/LockedFile_unix.cpp

(limited to 'libraries/LocalPeer/src/LockedFile_unix.cpp')

diff --git a/libraries/LocalPeer/src/LockedFile_unix.cpp b/libraries/LocalPeer/src/LockedFile_unix.cpp
new file mode 100644
index 00000000..4b68916c
--- /dev/null
+++ b/libraries/LocalPeer/src/LockedFile_unix.cpp
@@ -0,0 +1,114 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Solutions component.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "LockedFile.h"
+
+bool LockedFile::lock(LockMode mode, bool block)
+{
+	if (!isOpen()) {
+		qWarning("QtLockedFile::lock(): file is not opened");
+		return false;
+	}
+
+	if (mode == NoLock)
+		return unlock();
+
+	if (mode == m_lock_mode)
+		return true;
+
+	if (m_lock_mode != NoLock)
+		unlock();
+
+	struct flock fl;
+	fl.l_whence = SEEK_SET;
+	fl.l_start = 0;
+	fl.l_len = 0;
+	fl.l_type = (mode == ReadLock) ? F_RDLCK : F_WRLCK;
+	int cmd = block ? F_SETLKW : F_SETLK;
+	int ret = fcntl(handle(), cmd, &fl);
+
+	if (ret == -1) {
+		if (errno != EINTR && errno != EAGAIN)
+			qWarning("QtLockedFile::lock(): fcntl: %s", strerror(errno));
+		return false;
+	}
+
+
+	m_lock_mode = mode;
+	return true;
+}
+
+
+bool LockedFile::unlock()
+{
+	if (!isOpen()) {
+		qWarning("QtLockedFile::unlock(): file is not opened");
+		return false;
+	}
+
+	if (!isLocked())
+		return true;
+
+	struct flock fl;
+	fl.l_whence = SEEK_SET;
+	fl.l_start = 0;
+	fl.l_len = 0;
+	fl.l_type = F_UNLCK;
+	int ret = fcntl(handle(), F_SETLKW, &fl);
+
+	if (ret == -1) {
+		qWarning("QtLockedFile::lock(): fcntl: %s", strerror(errno));
+		return false;
+	}
+
+	m_lock_mode = NoLock;
+	return true;
+}
+
+LockedFile::~LockedFile()
+{
+	if (isOpen())
+		unlock();
+}
-- 
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