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https://github.com/LadybirdBrowser/ladybird.git
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4a3a947df3
This will allow File and it's descendants to use RefCounted instead of having a custom implementation of unref. (Since RefCounted calls will_be_destroyed automatically) This commit also removes an erroneous call to `before_removing` in AHCIPort, this is a duplicate call, as the only reference to the device is immediately dropped following the call, which in turns calls `before_removing` via File::unref.
117 lines
2.8 KiB
C++
117 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).will_be_destroyed();
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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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