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Serenity Operating System
1/*
2 * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#pragma once
8
9#include <AK/Badge.h>
10#include <Kernel/Devices/CharacterDevice.h>
11
12namespace Kernel {
13
14class MasterPTY;
15
16class PTYMultiplexer final : public CharacterDevice {
17public:
18 PTYMultiplexer();
19 virtual ~PTYMultiplexer() override;
20
21 static void initialize();
22 static PTYMultiplexer& the();
23
24 // ^CharacterDevice
25 virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
26 virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return 0; }
27 virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return 0; }
28 virtual bool can_read(OpenFileDescription const&, u64) const override { return true; }
29 virtual bool can_write(OpenFileDescription const&, u64) const override { return true; }
30
31 void notify_master_destroyed(Badge<MasterPTY>, unsigned index);
32
33private:
34 // ^CharacterDevice
35 virtual StringView class_name() const override { return "PTYMultiplexer"sv; }
36
37 static constexpr size_t max_pty_pairs = 64;
38 SpinlockProtected<Vector<unsigned, max_pty_pairs>, LockRank::None> m_freelist {};
39};
40
41}