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36 lines
1006 B
C++
36 lines
1006 B
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 "CharacterDevice.h"
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namespace Kernel {
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class NullDevice final : public CharacterDevice {
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AK_MAKE_ETERNAL
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public:
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NullDevice();
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virtual ~NullDevice() override;
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static void initialize();
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static NullDevice& the();
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// ^Device
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virtual mode_t required_mode() const override { return 0666; }
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virtual String device_name() const override { return "null"; }
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private:
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// ^CharacterDevice
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const FileDescription&, size_t) const override { return true; }
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual StringView class_name() const override { return "NullDevice"; }
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};
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}
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