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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Badge.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/DoubleBuffer.h>
namespace Kernel {
class SlavePTY;
class MasterPTY final : public CharacterDevice {
public:
[[nodiscard]] static RefPtr<MasterPTY> try_create(unsigned index);
virtual ~MasterPTY() override;
unsigned index() const { return m_index; }
String pts_name() const;
KResultOr<size_t> on_slave_write(const UserOrKernelBuffer&, size_t);
bool can_write_from_slave() const;
void notify_slave_closed(Badge<SlavePTY>);
bool is_closed() const { return m_closed; }
virtual String absolute_path(const FileDescription&) const override;
// ^Device
virtual mode_t required_mode() const override { return 0640; }
virtual String device_name() const override;
private:
explicit MasterPTY(unsigned index, NonnullOwnPtr<DoubleBuffer> buffer);
// ^CharacterDevice
virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResult close() override;
virtual bool is_master_pty() const override { return true; }
virtual KResult ioctl(FileDescription&, unsigned request, Userspace<void*> arg) override;
virtual StringView class_name() const override { return "MasterPTY"; }
RefPtr<SlavePTY> m_slave;
unsigned m_index;
bool m_closed { false };
NonnullOwnPtr<DoubleBuffer> m_buffer;
String m_pts_name;
};
}
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