mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
aee4786d8e
This singleton simplifies many aspects that we struggled with before: 1. There's no need to make derived classes of Device expose the constructor as public anymore. The singleton is a friend of them, so he can call the constructor. This solves the issue with try_create_device helper neatly, hopefully for good. 2. Getting a reference of the NullDevice is now being done from this singleton, which means that NullDevice no longer needs to use its own singleton, and we can apply the try_create_device helper on it too :) 3. We can now defer registration completely after the Device constructor which means the Device constructor is merely assigning the major and minor numbers of the Device, and the try_create_device helper ensures it calls the after_inserting method immediately after construction. This creates a great opportunity to make registration more OOM-safe.
33 lines
915 B
C++
33 lines
915 B
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Devices/CharacterDevice.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class FullDevice final : public CharacterDevice {
|
|
AK_MAKE_ETERNAL
|
|
friend class DeviceManagement;
|
|
|
|
public:
|
|
static NonnullRefPtr<FullDevice> must_create();
|
|
virtual ~FullDevice() override;
|
|
|
|
private:
|
|
FullDevice();
|
|
|
|
// ^CharacterDevice
|
|
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
|
|
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
|
|
virtual bool can_read(const OpenFileDescription&, size_t) const override;
|
|
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
|
|
virtual StringView class_name() const override { return "FullDevice"; }
|
|
};
|
|
|
|
}
|