mirror of
https://github.com/RGBCube/serenity
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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.
42 lines
1.6 KiB
C++
42 lines
1.6 KiB
C++
/*
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* Copyright (c) 2021, Patrick Meyer <git@the-space.agency>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/Devices/KCOVInstance.h>
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namespace Kernel {
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class KCOVDevice final : public BlockDevice {
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AK_MAKE_ETERNAL
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friend class DeviceManagement;
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public:
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static HashMap<ProcessID, KCOVInstance*>* proc_instance;
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static HashMap<ThreadID, KCOVInstance*>* thread_instance;
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static NonnullRefPtr<KCOVDevice> must_create();
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static void free_thread();
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static void free_process();
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// ^File
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KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
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KResultOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
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protected:
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KCOVDevice();
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virtual StringView class_name() const override { return "KCOVDevice"; }
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virtual bool can_read(const OpenFileDescription&, size_t) const override final { return true; }
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virtual bool can_write(const OpenFileDescription&, size_t) const override final { return true; }
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virtual void start_request(AsyncBlockDeviceRequest& request) override final { request.complete(AsyncDeviceRequest::Failure); }
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virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
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};
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}
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