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https://github.com/SerenityOS/serenity
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45 lines
1 KiB
C++
45 lines
1 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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#include <AK/Singleton.h>
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#include <Kernel/Devices/DeviceManagement.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 NonnullLockRefPtr<NullDevice> NullDevice::must_initialize()
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{
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auto null_device_or_error = DeviceManagement::try_create_device<NullDevice>();
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// FIXME: Find a way to propagate errors
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VERIFY(!null_device_or_error.is_error());
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return null_device_or_error.release_value();
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}
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UNMAP_AFTER_INIT NullDevice::NullDevice()
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: CharacterDevice(1, 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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