f5de4f24b2
Instead of doing so in the constructor, let's do immediately after the constructor, so we can safely pass a reference of a Device, so the SysFSDeviceComponent constructor can use that object to identify whether it's a block device or a character device. This allows to us to not hold a device in SysFSDeviceComponent with a RefPtr. Also, we also call the before_removing method in both SlavePTY::unref and File::unref, so because Device has that method being overrided, it can ensure the device is removed always cleanly.
40 lines
1.4 KiB
C++
40 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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#pragma once
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel {
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class MemoryDevice final : public CharacterDevice {
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AK_MAKE_ETERNAL
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public:
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static NonnullRefPtr<MemoryDevice> must_create();
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~MemoryDevice();
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virtual KResultOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
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// FIXME: We expose this constructor to make try_create_device helper to work
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MemoryDevice();
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private:
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virtual StringView class_name() const override { return "MemoryDevice"; }
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virtual bool can_read(const OpenFileDescription&, size_t) const override { return true; }
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virtual bool can_write(const OpenFileDescription&, size_t) const override { return false; }
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virtual bool is_seekable() const override { return true; }
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virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return EINVAL; }
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virtual void did_seek(OpenFileDescription&, off_t) override;
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bool is_allowed_range(PhysicalAddress, Memory::VirtualRange const&) const;
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};
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}
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