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65b420f996
These instances were detected by searching for files that include AK/Memory.h, but don't match the regex: \\b(fast_u32_copy|fast_u32_fill|secure_zero|timing_safe_compare)\\b This regex is pessimistic, so there might be more files that don't actually use any memory function. In theory, one might use LibCPP to detect things like this automatically, but let's do this one step after another.
44 lines
1 KiB
C++
44 lines
1 KiB
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/DeviceManagement.h>
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#include <Kernel/Devices/ZeroDevice.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullLockRefPtr<ZeroDevice> ZeroDevice::must_create()
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{
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auto zero_device_or_error = DeviceManagement::try_create_device<ZeroDevice>();
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// FIXME: Find a way to propagate errors
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VERIFY(!zero_device_or_error.is_error());
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return zero_device_or_error.release_value();
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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() = default;
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bool ZeroDevice::can_read(OpenFileDescription const&, u64) const
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{
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return true;
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}
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ErrorOr<size_t> ZeroDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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TRY(buffer.memset(0, size));
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return size;
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}
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ErrorOr<size_t> ZeroDevice::write(OpenFileDescription&, u64, UserOrKernelBuffer const&, 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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