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https://github.com/SerenityOS/serenity
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b55199c227
The TTY subsystem is represented with unix devices, so it should be under the Devices directory like the Audio, Storage, GPU and HID subsystems.
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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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/Badge.h>
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#include <Kernel/Devices/CharacterDevice.h>
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namespace Kernel {
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class MasterPTY;
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class PTYMultiplexer final : public CharacterDevice {
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public:
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PTYMultiplexer();
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virtual ~PTYMultiplexer() override;
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static void initialize();
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static PTYMultiplexer& the();
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// ^CharacterDevice
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virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return 0; }
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return 0; }
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virtual bool can_read(OpenFileDescription const&, u64) const override { return true; }
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virtual bool can_write(OpenFileDescription const&, u64) const override { return true; }
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void notify_master_destroyed(Badge<MasterPTY>, unsigned index);
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private:
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// ^CharacterDevice
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virtual StringView class_name() const override { return "PTYMultiplexer"sv; }
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static constexpr size_t max_pty_pairs = 64;
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SpinlockProtected<Vector<unsigned, max_pty_pairs>, LockRank::None> m_freelist {};
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};
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}
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