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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. :^)
48 lines
1 KiB
C++
48 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/Memory.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/ZeroDevice.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<ZeroDevice> ZeroDevice::must_create()
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{
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auto zero_device_or_error = DeviceManagement::try_create_device<ZeroDevice>();
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// FIXME: Find a way to propagate errors
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VERIFY(!zero_device_or_error.is_error());
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return zero_device_or_error.release_value();
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}
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UNMAP_AFTER_INIT ZeroDevice::ZeroDevice()
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: CharacterDevice(1, 5)
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{
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}
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UNMAP_AFTER_INIT ZeroDevice::~ZeroDevice()
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{
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}
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bool ZeroDevice::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> ZeroDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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TRY(buffer.memset(0, size));
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return size;
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}
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ErrorOr<size_t> ZeroDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
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{
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return size;
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}
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}
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