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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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.
*
* 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 HOLDER 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.
*/
#include "SlavePTY.h"
#include "MasterPTY.h"
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/DevPtsFS.h>
#include <Kernel/Process.h>
namespace Kernel {
SlavePTY::SlavePTY(MasterPTY& master, unsigned index)
: TTY(201, index)
, m_master(master)
, m_index(index)
{
m_tty_name = String::formatted("/dev/pts/{}", m_index);
auto process = Process::current();
set_uid(process->uid());
set_gid(process->gid());
DevPtsFS::register_slave_pty(*this);
set_size(80, 25);
}
SlavePTY::~SlavePTY()
{
dbgln_if(SLAVEPTY_DEBUG, "~SlavePTY({})", m_index);
DevPtsFS::unregister_slave_pty(*this);
}
String SlavePTY::tty_name() const
{
return m_tty_name;
}
void SlavePTY::echo(u8 ch)
{
if (should_echo_input()) {
auto buffer = UserOrKernelBuffer::for_kernel_buffer(&ch);
m_master->on_slave_write(buffer, 1);
}
}
void SlavePTY::on_master_write(const UserOrKernelBuffer& buffer, ssize_t size)
{
ssize_t nread = buffer.read_buffered<128>(size, [&](const u8* data, size_t data_size) {
for (size_t i = 0; i < data_size; ++i)
emit(data[i], false);
return (ssize_t)data_size;
});
if (nread > 0)
evaluate_block_conditions();
}
ssize_t SlavePTY::on_tty_write(const UserOrKernelBuffer& data, ssize_t size)
{
m_time_of_last_write = kgettimeofday().to_truncated_seconds();
return m_master->on_slave_write(data, size);
}
bool SlavePTY::can_write(const FileDescription&, size_t) const
{
return m_master->can_write_from_slave();
}
bool SlavePTY::can_read(const FileDescription& description, size_t offset) const
{
if (m_master->is_closed())
return true;
return TTY::can_read(description, offset);
}
KResultOr<size_t> SlavePTY::read(FileDescription& description, u64 offset, UserOrKernelBuffer& buffer, size_t size)
{
if (m_master->is_closed())
return 0;
return TTY::read(description, offset, buffer, size);
}
KResult SlavePTY::close()
{
m_master->notify_slave_closed({});
return KSuccess;
}
String SlavePTY::device_name() const
{
return String::formatted("{}", minor());
}
FileBlockCondition& SlavePTY::block_condition()
{
return m_master->block_condition();
}
}
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