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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Badge.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/Locking/Mutex.h>
namespace Kernel {
class MasterPTY;
class PTYMultiplexer final : public CharacterDevice {
public:
PTYMultiplexer();
virtual ~PTYMultiplexer() override;
static void initialize();
static PTYMultiplexer& the();
// ^CharacterDevice
virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override { return 0; }
virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override { return 0; }
virtual bool can_read(const OpenFileDescription&, u64) const override { return true; }
virtual bool can_write(const OpenFileDescription&, size_t) const override { return true; }
void notify_master_destroyed(Badge<MasterPTY>, unsigned index);
private:
// ^CharacterDevice
virtual StringView class_name() const override { return "PTYMultiplexer"sv; }
static constexpr size_t max_pty_pairs = 64;
MutexProtected<Vector<unsigned, max_pty_pairs>> m_freelist;
};
}
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