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19d3f8cab7
..and allow implicit creation of KResult and KResultOr from ErrnoCode. This means that kernel functions that return those types can finally do "return EINVAL;" and it will just work. There's a handful of functions that still deal with signed integers that should be converted to return KResults.
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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ZeroDevice::ZeroDevice()
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: CharacterDevice(1, 5)
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{
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}
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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&, size_t, UserOrKernelBuffer& buffer, size_t size)
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{
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ssize_t count = min(static_cast<size_t>(PAGE_SIZE), size);
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if (!buffer.memset(0, count))
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return EFAULT;
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return count;
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}
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KResultOr<size_t> ZeroDevice::write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t size)
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{
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return min(static_cast<size_t>(PAGE_SIZE), size);
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}
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}
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