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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. :^)
51 lines
1.2 KiB
C++
51 lines
1.2 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 <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Devices/RandomDevice.h>
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#include <Kernel/Random.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<RandomDevice> RandomDevice::must_create()
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{
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auto random_device_or_error = DeviceManagement::try_create_device<RandomDevice>();
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// FIXME: Find a way to propagate errors
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VERIFY(!random_device_or_error.is_error());
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return random_device_or_error.release_value();
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}
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UNMAP_AFTER_INIT RandomDevice::RandomDevice()
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: CharacterDevice(1, 8)
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{
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}
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UNMAP_AFTER_INIT RandomDevice::~RandomDevice()
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{
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}
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bool RandomDevice::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> RandomDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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return buffer.write_buffered<256>(size, [&](Bytes bytes) {
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get_good_random_bytes(bytes);
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return bytes.size();
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});
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}
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ErrorOr<size_t> RandomDevice::write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t size)
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{
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// FIXME: Use input for entropy? I guess that could be a neat feature?
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return size;
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}
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}
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