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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/CircularDeque.h>
#include <AK/WeakPtr.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/DoubleBuffer.h>
#include <Kernel/ProcessGroup.h>
#include <Kernel/UnixTypes.h>
#define TTY_BUFFER_SIZE 1024
namespace Kernel {
class TTY : public CharacterDevice {
public:
virtual ~TTY() override;
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 int ioctl(FileDescription&, unsigned request, FlatPtr arg) override final;
virtual String absolute_path(const FileDescription&) const override { return tty_name(); }
virtual String const& tty_name() const = 0;
unsigned short rows() const { return m_rows; }
unsigned short columns() const { return m_columns; }
ProcessGroupID pgid() const
{
if (auto pg = m_pg.strong_ref())
return pg->pgid();
return 0;
}
int set_termios(const termios&);
bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
bool should_flush_on_signal() const { return !(m_termios.c_lflag & NOFLSH); }
bool should_echo_input() const { return m_termios.c_lflag & ECHO; }
bool in_canonical_mode() const { return m_termios.c_lflag & ICANON; }
void set_default_termios();
void hang_up();
// ^Device
virtual mode_t required_mode() const override { return 0620; }
protected:
virtual ssize_t on_tty_write(const UserOrKernelBuffer&, ssize_t) = 0;
void set_size(unsigned short columns, unsigned short rows);
TTY(unsigned major, unsigned minor);
void emit(u8, bool do_evaluate_block_conditions = false);
virtual void echo(u8) = 0;
bool can_do_backspace() const;
void do_backspace();
void erase_word();
void erase_character();
void kill_line();
void flush_input();
bool is_eol(u8) const;
bool is_eof(u8) const;
bool is_kill(u8) const;
bool is_erase(u8) const;
bool is_werase(u8) const;
void generate_signal(int signal);
int m_available_lines { 0 };
private:
// ^CharacterDevice
virtual bool is_tty() const final override { return true; }
inline void echo_with_processing(u8);
template<typename Functor>
void process_output(u8, Functor put_char);
CircularDeque<u8, TTY_BUFFER_SIZE> m_input_buffer;
// FIXME: use something like AK::Bitmap but which takes a size template parameter
u8 m_special_character_bitmask[TTY_BUFFER_SIZE / 8];
WeakPtr<Process> m_original_process_parent;
WeakPtr<ProcessGroup> m_pg;
termios m_termios;
unsigned short m_rows { 0 };
unsigned short m_columns { 0 };
};
}
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