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diff --git a/src/sequencer/ControlBlockMmapper.cpp b/src/sequencer/ControlBlockMmapper.cpp
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+++ b/src/sequencer/ControlBlockMmapper.cpp
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+
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#include "ControlBlockMmapper.h"
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/mman.h>
+
+#include "misc/Debug.h"
+
+namespace Rosegarden
+{
+
+ControlBlockMmapper::ControlBlockMmapper(QString fileName)
+        : m_fileName(fileName),
+        m_fd( -1),
+        m_mmappedBuffer(0),
+        m_mmappedSize(sizeof(ControlBlock)),
+        m_controlBlock(0)
+{
+    m_fd = ::open(m_fileName.latin1(), O_RDWR);
+
+    if (m_fd < 0) {
+        SEQMAN_DEBUG << "ControlBlockMmapper : Couldn't open " << m_fileName
+        << endl;
+        throw Exception(std::string("Couldn't open ")
+                        + m_fileName.latin1());
+    }
+
+    //
+    // mmap() file for reading
+    //
+    m_mmappedBuffer = (char*)::mmap(0, m_mmappedSize,
+                                    PROT_READ, MAP_SHARED, m_fd, 0);
+
+    if (m_mmappedBuffer == (void*) - 1) {
+
+        SEQUENCER_DEBUG << QString("mmap failed : (%1) %2\n").
+        arg(errno).arg(strerror(errno));
+
+        throw Exception("mmap failed");
+    }
+
+    SEQMAN_DEBUG << "ControlBlockMmapper : mmap size : " << m_mmappedSize
+    << " at " << (void*)m_mmappedBuffer << endl;
+
+    // Create new control block on file
+    m_controlBlock = new (m_mmappedBuffer) ControlBlock;
+}
+
+ControlBlockMmapper::~ControlBlockMmapper()
+{
+    ::munmap(m_mmappedBuffer, m_mmappedSize);
+    ::close(m_fd);
+}
+
+}