mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-26 09:30:24 +00:00
128 lines
3 KiB
C++
128 lines
3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "MasterPTY.h"
|
|
#include "PTYMultiplexer.h"
|
|
#include "SlavePTY.h"
|
|
#include <Kernel/Debug.h>
|
|
#include <Kernel/Process.h>
|
|
#include <LibC/errno_numbers.h>
|
|
#include <LibC/signal_numbers.h>
|
|
#include <LibC/sys/ioctl_numbers.h>
|
|
|
|
namespace Kernel {
|
|
|
|
MasterPTY::MasterPTY(unsigned index)
|
|
: CharacterDevice(200, index)
|
|
, m_slave(adopt_ref(*new SlavePTY(*this, index)))
|
|
, m_index(index)
|
|
{
|
|
m_pts_name = String::formatted("/dev/pts/{}", m_index);
|
|
auto process = Process::current();
|
|
set_uid(process->uid());
|
|
set_gid(process->gid());
|
|
|
|
m_buffer.set_unblock_callback([this]() {
|
|
if (m_slave)
|
|
evaluate_block_conditions();
|
|
});
|
|
}
|
|
|
|
MasterPTY::~MasterPTY()
|
|
{
|
|
dbgln_if(MASTERPTY_DEBUG, "~MasterPTY({})", m_index);
|
|
PTYMultiplexer::the().notify_master_destroyed({}, m_index);
|
|
}
|
|
|
|
String MasterPTY::pts_name() const
|
|
{
|
|
return m_pts_name;
|
|
}
|
|
|
|
KResultOr<size_t> MasterPTY::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
|
|
{
|
|
if (!m_slave && m_buffer.is_empty())
|
|
return 0;
|
|
return m_buffer.read(buffer, size);
|
|
}
|
|
|
|
KResultOr<size_t> MasterPTY::write(FileDescription&, u64, const UserOrKernelBuffer& buffer, size_t size)
|
|
{
|
|
if (!m_slave)
|
|
return EIO;
|
|
m_slave->on_master_write(buffer, size);
|
|
return size;
|
|
}
|
|
|
|
bool MasterPTY::can_read(const FileDescription&, size_t) const
|
|
{
|
|
if (!m_slave)
|
|
return true;
|
|
return !m_buffer.is_empty();
|
|
}
|
|
|
|
bool MasterPTY::can_write(const FileDescription&, size_t) const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
void MasterPTY::notify_slave_closed(Badge<SlavePTY>)
|
|
{
|
|
dbgln_if(MASTERPTY_DEBUG, "MasterPTY({}): slave closed, my retains: {}, slave retains: {}", m_index, ref_count(), m_slave->ref_count());
|
|
// +1 ref for my MasterPTY::m_slave
|
|
// +1 ref for FileDescription::m_device
|
|
if (m_slave->ref_count() == 2)
|
|
m_slave = nullptr;
|
|
}
|
|
|
|
ssize_t MasterPTY::on_slave_write(const UserOrKernelBuffer& data, ssize_t size)
|
|
{
|
|
if (m_closed)
|
|
return -EIO;
|
|
return m_buffer.write(data, size);
|
|
}
|
|
|
|
bool MasterPTY::can_write_from_slave() const
|
|
{
|
|
if (m_closed)
|
|
return true;
|
|
return m_buffer.space_for_writing();
|
|
}
|
|
|
|
KResult MasterPTY::close()
|
|
{
|
|
InterruptDisabler disabler;
|
|
// After the closing FileDescription dies, slave is the only thing keeping me alive.
|
|
// From this point, let's consider ourselves closed.
|
|
m_closed = true;
|
|
|
|
if (m_slave)
|
|
m_slave->hang_up();
|
|
|
|
return KSuccess;
|
|
}
|
|
|
|
int MasterPTY::ioctl(FileDescription& description, unsigned request, FlatPtr arg)
|
|
{
|
|
REQUIRE_PROMISE(tty);
|
|
if (!m_slave)
|
|
return -EIO;
|
|
if (request == TIOCSWINSZ || request == TIOCGPGRP)
|
|
return m_slave->ioctl(description, request, arg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
String MasterPTY::absolute_path(const FileDescription&) const
|
|
{
|
|
return String::formatted("ptm:{}", m_pts_name);
|
|
}
|
|
|
|
String MasterPTY::device_name() const
|
|
{
|
|
return String::formatted("{}", minor());
|
|
}
|
|
|
|
}
|