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7a3ab6c517
Instead of returning a ssize_t where negative values mean error, we now return KResultOr<size_t> and use the error state to report errors exclusively.
146 lines
4.1 KiB
C++
146 lines
4.1 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 "MasterPTY.h"
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#include "PTYMultiplexer.h"
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#include "SlavePTY.h"
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#include <Kernel/Process.h>
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#include <LibC/errno_numbers.h>
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#include <LibC/signal_numbers.h>
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#include <LibC/sys/ioctl_numbers.h>
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//#define MASTERPTY_DEBUG
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namespace Kernel {
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MasterPTY::MasterPTY(unsigned index)
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: CharacterDevice(200, index)
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, m_slave(adopt(*new SlavePTY(*this, index)))
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, m_index(index)
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{
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m_pts_name = String::format("/dev/pts/%u", m_index);
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auto process = Process::current();
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set_uid(process->uid());
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set_gid(process->gid());
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}
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MasterPTY::~MasterPTY()
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{
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#ifdef MASTERPTY_DEBUG
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dbg() << "~MasterPTY(" << m_index << ")";
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#endif
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PTYMultiplexer::the().notify_master_destroyed({}, m_index);
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}
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String MasterPTY::pts_name() const
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{
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return m_pts_name;
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}
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KResultOr<size_t> MasterPTY::read(FileDescription&, size_t, u8* buffer, size_t size)
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{
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if (!m_slave && m_buffer.is_empty())
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return 0;
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return m_buffer.read(buffer, size);
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}
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KResultOr<size_t> MasterPTY::write(FileDescription&, size_t, const u8* buffer, size_t size)
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{
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if (!m_slave)
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return KResult(-EIO);
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m_slave->on_master_write(buffer, size);
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return size;
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}
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bool MasterPTY::can_read(const FileDescription&, size_t) const
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{
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if (!m_slave)
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return true;
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return !m_buffer.is_empty();
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}
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bool MasterPTY::can_write(const FileDescription&, size_t) const
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{
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return true;
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}
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void MasterPTY::notify_slave_closed(Badge<SlavePTY>)
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{
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#ifdef MASTERPTY_DEBUG
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dbg() << "MasterPTY(" << m_index << "): slave closed, my retains: " << ref_count() << ", slave retains: " << m_slave->ref_count();
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#endif
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// +1 ref for my MasterPTY::m_slave
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// +1 ref for FileDescription::m_device
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if (m_slave->ref_count() == 2)
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m_slave = nullptr;
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}
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ssize_t MasterPTY::on_slave_write(const u8* data, ssize_t size)
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{
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if (m_closed)
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return -EIO;
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m_buffer.write(data, size);
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return size;
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}
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bool MasterPTY::can_write_from_slave() const
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{
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if (m_closed)
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return true;
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return m_buffer.space_for_writing();
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}
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KResult MasterPTY::close()
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{
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if (ref_count() == 2) {
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InterruptDisabler disabler;
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// After the closing FileDescription dies, slave is the only thing keeping me alive.
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// From this point, let's consider ourselves closed.
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m_closed = true;
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m_slave->hang_up();
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}
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return KSuccess;
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}
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int MasterPTY::ioctl(FileDescription& description, unsigned request, FlatPtr arg)
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{
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REQUIRE_PROMISE(tty);
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if (!m_slave)
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return -EIO;
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if (request == TIOCSWINSZ || request == TIOCGPGRP)
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return m_slave->ioctl(description, request, arg);
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return -EINVAL;
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}
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String MasterPTY::absolute_path(const FileDescription&) const
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{
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return String::format("ptm:%s", m_pts_name.characters());
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}
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}
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