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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/DevPtsFS.h>
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#include <Kernel/Process.h>
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#include <Kernel/TTY/MasterPTY.h>
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#include <Kernel/TTY/SlavePTY.h>
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namespace Kernel {
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static Singleton<SpinlockProtected<SlavePTY::List>> s_all_instances;
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SpinlockProtected<SlavePTY::List>& SlavePTY::all_instances()
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{
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return s_all_instances;
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}
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bool SlavePTY::unref() const
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{
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bool did_hit_zero = SlavePTY::all_instances().with([&](auto&) {
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if (deref_base())
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return false;
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m_list_node.remove();
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return true;
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});
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if (did_hit_zero) {
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const_cast<SlavePTY&>(*this).before_removing();
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delete this;
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}
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return did_hit_zero;
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}
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SlavePTY::SlavePTY(MasterPTY& master, unsigned index, NonnullOwnPtr<KString> tty_name)
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: TTY(201, index)
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, m_master(master)
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, m_index(index)
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, m_tty_name(move(tty_name))
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{
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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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set_size(80, 25);
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SlavePTY::all_instances().with([&](auto& list) { list.append(*this); });
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}
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SlavePTY::~SlavePTY()
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{
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dbgln_if(SLAVEPTY_DEBUG, "~SlavePTY({})", m_index);
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}
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KString const& SlavePTY::tty_name() const
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{
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return *m_tty_name;
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}
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void SlavePTY::echo(u8 ch)
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{
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if (should_echo_input()) {
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auto buffer = UserOrKernelBuffer::for_kernel_buffer(&ch);
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[[maybe_unused]] auto result = m_master->on_slave_write(buffer, 1);
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}
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}
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void SlavePTY::on_master_write(const UserOrKernelBuffer& buffer, size_t size)
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{
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auto result = buffer.read_buffered<128>(size, [&](ReadonlyBytes data) {
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for (const auto& byte : data)
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emit(byte, false);
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return data.size();
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});
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if (!result.is_error())
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evaluate_block_conditions();
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}
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ErrorOr<size_t> SlavePTY::on_tty_write(const UserOrKernelBuffer& data, size_t size)
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{
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m_time_of_last_write = kgettimeofday().to_truncated_seconds();
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return m_master->on_slave_write(data, size);
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}
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bool SlavePTY::can_write(const OpenFileDescription&, size_t) const
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{
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return m_master->can_write_from_slave();
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}
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bool SlavePTY::can_read(const OpenFileDescription& description, size_t offset) const
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{
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if (m_master->is_closed())
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return true;
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return TTY::can_read(description, offset);
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}
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ErrorOr<size_t> SlavePTY::read(OpenFileDescription& description, u64 offset, UserOrKernelBuffer& buffer, size_t size)
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{
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if (m_master->is_closed())
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return 0;
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return TTY::read(description, offset, buffer, size);
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}
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ErrorOr<void> SlavePTY::close()
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{
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m_master->notify_slave_closed({});
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return {};
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}
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FileBlockerSet& SlavePTY::blocker_set()
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{
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return m_master->blocker_set();
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}
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}
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