mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-09 16:42:10 +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.
43 lines
967 B
C++
43 lines
967 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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#include <AK/Singleton.h>
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#include <Kernel/API/MajorNumberAllocation.h>
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#include <Kernel/Devices/Device.h>
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#include <Kernel/Devices/Generic/NullDevice.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<NullDevice> NullDevice::must_initialize()
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{
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return MUST(Device::try_create_device<NullDevice>());
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}
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UNMAP_AFTER_INIT NullDevice::NullDevice()
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: CharacterDevice(MajorAllocation::CharacterDeviceFamily::Generic, 3)
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{
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}
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UNMAP_AFTER_INIT NullDevice::~NullDevice() = default;
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bool NullDevice::can_read(OpenFileDescription const&, u64) const
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{
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return true;
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}
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ErrorOr<size_t> NullDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
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{
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return 0;
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}
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ErrorOr<size_t> NullDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t buffer_size)
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{
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return buffer_size;
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}
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}
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