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https://github.com/RGBCube/serenity
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29f9a38f76
Instead, try to create the device objects in separate static methods, and if we fail for some odd reason to allocate memory for such devices, just panic with that reason.
46 lines
1 KiB
C++
46 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 <Kernel/Devices/RandomDevice.h>
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#include <Kernel/Panic.h>
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#include <Kernel/Random.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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return adopt_ref_if_nonnull(new RandomDevice).release_nonnull();
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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 FileDescription&, size_t) const
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{
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return true;
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}
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KResultOr<size_t> RandomDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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return buffer.write_buffered<256>(size, [&](u8* data, size_t data_size) {
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get_good_random_bytes(data, data_size);
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return data_size;
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});
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}
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KResultOr<size_t> RandomDevice::write(FileDescription&, 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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