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1ce32ef675
Previously reads and writes to /dev/zero, /dev/full, /dev/null and /dev/random were limited to 4096 bytes. This removes that restriction so that users can enjoy more zero bytes in their buffers.
41 lines
891 B
C++
41 lines
891 B
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/Random.h>
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namespace Kernel {
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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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