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serenity/Kernel/Devices/ZeroDevice.cpp
Andreas Kling b481132418 Kernel: Make UserOrKernelBuffer return KResult from read/write/memset
This allows us to simplify a whole bunch of call sites with TRY(). :^)
2021-09-07 13:53:14 +02:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Memory.h>
#include <Kernel/Devices/ZeroDevice.h>
#include <Kernel/Sections.h>
namespace Kernel {
UNMAP_AFTER_INIT NonnullRefPtr<ZeroDevice> ZeroDevice::must_create()
{
return adopt_ref(*new ZeroDevice);
}
UNMAP_AFTER_INIT ZeroDevice::ZeroDevice()
: CharacterDevice(1, 5)
{
}
UNMAP_AFTER_INIT ZeroDevice::~ZeroDevice()
{
}
bool ZeroDevice::can_read(const FileDescription&, size_t) const
{
return true;
}
KResultOr<size_t> ZeroDevice::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
{
TRY(buffer.memset(0, size));
return size;
}
KResultOr<size_t> ZeroDevice::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t size)
{
return size;
}
}