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190cf1507b
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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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/DeviceControlDevice.h>
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#include <Kernel/Devices/DeviceManagement.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<DeviceControlDevice> DeviceControlDevice::must_create()
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{
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auto device_control_device_or_error = DeviceManagement::try_create_device<DeviceControlDevice>();
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// FIXME: Find a way to propagate errors
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VERIFY(!device_control_device_or_error.is_error());
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return device_control_device_or_error.release_value();
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}
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bool DeviceControlDevice::can_read(const OpenFileDescription&, u64) const
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{
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return true;
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}
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UNMAP_AFTER_INIT DeviceControlDevice::DeviceControlDevice()
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: CharacterDevice(2, 10)
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{
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}
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UNMAP_AFTER_INIT DeviceControlDevice::~DeviceControlDevice() = default;
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ErrorOr<size_t> DeviceControlDevice::read(OpenFileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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auto device_event = DeviceManagement::the().dequeue_top_device_event({});
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if (!device_event.has_value())
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return 0;
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if (size < sizeof(DeviceEvent))
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return Error::from_errno(EOVERFLOW);
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size_t nread = 0;
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TRY(buffer.write(&device_event.value(), nread, sizeof(DeviceEvent)));
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nread += sizeof(DeviceEvent);
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return nread;
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}
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ErrorOr<void> DeviceControlDevice::ioctl(OpenFileDescription&, unsigned, Userspace<void*>)
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{
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return Error::from_errno(ENOTSUP);
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}
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}
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