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https://github.com/LadybirdBrowser/ladybird.git
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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.
50 lines
845 B
C++
50 lines
845 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 "NullDevice.h"
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#include <AK/Singleton.h>
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#include <AK/StdLibExtras.h>
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namespace Kernel {
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static AK::Singleton<NullDevice> s_the;
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UNMAP_AFTER_INIT void NullDevice::initialize()
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{
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s_the.ensure_instance();
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}
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NullDevice& NullDevice::the()
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{
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return *s_the;
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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 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> NullDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
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{
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return 0;
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}
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KResultOr<size_t> NullDevice::write(FileDescription&, 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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