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Serenity Operating System
1/*
2 * Copyright (c) 2021-2022, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#pragma once
8
9#include <Kernel/FileSystem/File.h>
10#include <Kernel/Memory/AnonymousVMObject.h>
11
12namespace Kernel {
13
14class AnonymousFile final : public File {
15public:
16 static ErrorOr<NonnullRefPtr<AnonymousFile>> try_create(NonnullLockRefPtr<Memory::AnonymousVMObject> vmobject)
17 {
18 return adopt_nonnull_ref_or_enomem(new (nothrow) AnonymousFile(move(vmobject)));
19 }
20
21 virtual ~AnonymousFile() override;
22
23 virtual ErrorOr<NonnullLockRefPtr<Memory::VMObject>> vmobject_for_mmap(Process&, Memory::VirtualRange const&, u64& offset, bool shared) override;
24
25private:
26 virtual StringView class_name() const override { return "AnonymousFile"sv; }
27 virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const&) const override;
28 virtual bool can_read(OpenFileDescription const&, u64) const override { return false; }
29 virtual bool can_write(OpenFileDescription const&, u64) const override { return false; }
30 virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return ENOTSUP; }
31 virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return ENOTSUP; }
32
33 explicit AnonymousFile(NonnullLockRefPtr<Memory::AnonymousVMObject>);
34
35 NonnullLockRefPtr<Memory::AnonymousVMObject> m_vmobject;
36};
37
38}