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84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "PTYMultiplexer.h"
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#include "MasterPTY.h"
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Process.h>
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#include <Kernel/Singleton.h>
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#include <LibC/errno_numbers.h>
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//#define PTMX_DEBUG
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namespace Kernel {
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static const unsigned s_max_pty_pairs = 8;
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static auto s_the = make_singleton<PTYMultiplexer>();
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PTYMultiplexer& PTYMultiplexer::the()
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{
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return *s_the;
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}
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PTYMultiplexer::PTYMultiplexer()
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: CharacterDevice(5, 2)
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{
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m_freelist.ensure_capacity(s_max_pty_pairs);
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for (int i = s_max_pty_pairs; i > 0; --i)
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m_freelist.unchecked_append(i - 1);
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}
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PTYMultiplexer::~PTYMultiplexer()
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{
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}
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KResultOr<NonnullRefPtr<FileDescription>> PTYMultiplexer::open(int options)
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{
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LOCKER(m_lock);
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if (m_freelist.is_empty())
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return KResult(-EBUSY);
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auto master_index = m_freelist.take_last();
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auto master = adopt(*new MasterPTY(master_index));
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#ifdef PTMX_DEBUG
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dbg() << "PTYMultiplexer::open: Vending master " << master->index();
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#endif
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auto description = FileDescription::create(move(master));
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description->set_rw_mode(options);
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description->set_file_flags(options);
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return description;
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}
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void PTYMultiplexer::notify_master_destroyed(Badge<MasterPTY>, unsigned index)
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{
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LOCKER(m_lock);
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m_freelist.append(index);
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#ifdef PTMX_DEBUG
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dbg() << "PTYMultiplexer: " << index << " added to freelist";
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#endif
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}
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}
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