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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
47 lines
1 KiB
C++
47 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/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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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()
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{
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}
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bool NullDevice::can_read(const OpenFileDescription&, size_t) 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, const UserOrKernelBuffer&, 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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