mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-12 01:47:00 +02:00
3edc6ae0d6
Do this by: - Removing more instances of `LockRefPtr` and `NonnullLockRefPtr`. - Using better names of construction methods (i.e. `create` instead of `try_create`). - Only returning `NonnullRefPtr` on the `Device::try_create_device` method. - Removing a version of the `Device::try_create_device` method that called `DeviceType::try_create(forward<Args>(args)...)`, which was only used in a construction point in a VirtIO driver which now doesn't need this anymore.
37 lines
1.0 KiB
C++
37 lines
1.0 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 <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 Device;
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public:
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virtual ~NullDevice() override;
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static NonnullRefPtr<NullDevice> must_initialize();
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private:
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NullDevice();
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// ^Device
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virtual bool is_openable_by_jailed_processes() const override { return true; }
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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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