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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.
40 lines
723 B
C++
40 lines
723 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 "ZeroDevice.h"
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#include <AK/Memory.h>
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#include <AK/StdLibExtras.h>
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namespace Kernel {
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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 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> ZeroDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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if (!buffer.memset(0, size))
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return EFAULT;
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return size;
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}
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KResultOr<size_t> ZeroDevice::write(FileDescription&, 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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