mirror of
https://github.com/RGBCube/serenity
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9f6eabd73a
This is minor progress on removing the `AK::String` API from the Kernel in the interest of improving OOM safety.
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, 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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#pragma once
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#include <AK/Badge.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/DoubleBuffer.h>
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namespace Kernel {
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class SlavePTY;
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class MasterPTY final : public CharacterDevice {
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public:
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static KResultOr<NonnullRefPtr<MasterPTY>> try_create(unsigned index);
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virtual ~MasterPTY() override;
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unsigned index() const { return m_index; }
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KString const& pts_name() const;
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KResultOr<size_t> on_slave_write(const UserOrKernelBuffer&, size_t);
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bool can_write_from_slave() const;
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void notify_slave_closed(Badge<SlavePTY>);
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bool is_closed() const { return m_closed; }
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virtual KResultOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const override;
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private:
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explicit MasterPTY(unsigned index, NonnullOwnPtr<DoubleBuffer> buffer, NonnullOwnPtr<KString> pts_name);
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// ^CharacterDevice
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virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual bool can_write(const OpenFileDescription&, size_t) const override;
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virtual KResult close() override;
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virtual bool is_master_pty() const override { return true; }
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virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
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virtual StringView class_name() const override { return "MasterPTY"sv; }
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RefPtr<SlavePTY> m_slave;
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unsigned m_index;
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bool m_closed { false };
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NonnullOwnPtr<DoubleBuffer> m_buffer;
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NonnullOwnPtr<KString> m_pts_name;
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};
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}
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