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2a5d9a6944
This does the exact thing as `adopt_ref`, which is a recent addition to AK. Note that pointers returned by a bare new (without `nothrow`) are guaranteed not to return null, so they can safely be converted into references.
47 lines
906 B
C++
47 lines
906 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 <AK/Memory.h>
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#include <AK/StdLibExtras.h>
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#include <Kernel/Devices/ZeroDevice.h>
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#include <Kernel/Panic.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<ZeroDevice> ZeroDevice::must_create()
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{
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return adopt_ref(*new ZeroDevice);
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}
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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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