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