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https://github.com/SerenityOS/serenity
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11eee67b85
Until now, our kernel has reimplemented a number of AK classes to provide automatic internal locking: - RefPtr - NonnullRefPtr - WeakPtr - Weakable This patch renames the Kernel classes so that they can coexist with the original AK classes: - RefPtr => LockRefPtr - NonnullRefPtr => NonnullLockRefPtr - WeakPtr => LockWeakPtr - Weakable => LockWeakable The goal here is to eventually get rid of the Lock* classes in favor of using external locking.
33 lines
958 B
C++
33 lines
958 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 <Kernel/Devices/CharacterDevice.h>
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namespace Kernel {
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class NullDevice final : public CharacterDevice {
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friend class DeviceManagement;
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public:
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virtual ~NullDevice() override;
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static NonnullLockRefPtr<NullDevice> must_initialize();
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private:
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NullDevice();
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// ^CharacterDevice
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
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virtual bool can_write(OpenFileDescription const&, u64) const override { return true; }
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virtual bool can_read(OpenFileDescription const&, u64) const override;
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virtual StringView class_name() const override { return "NullDevice"sv; }
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virtual bool is_seekable() const override { return true; }
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};
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}
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