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06c835f857
I introduced a regression in #7184 where `TTY` would report 1 byte read in canonical mode even if we had no more characters left. This was caused by counting the '\0' that denotes EOF into the number of characters that were read. The fix was simple: exclude the EOF character from the number of bytes. This still wouldn't be correct by itself, as the EOF and EOL control characters could change between when the data was written to the TTY and when it is read. We fix this by signaling out-of-band whether something is a special character. End-of-file markers have a value of zero and have their special bits set. Any other bytes with a special flag are treated as line endings. This is possible, as POSIX doesn't allow special characters to be 0. Fixes #7419
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020, 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/CircularDeque.h>
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#include <AK/WeakPtr.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/DoubleBuffer.h>
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#include <Kernel/ProcessGroup.h>
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#include <Kernel/UnixTypes.h>
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#define TTY_BUFFER_SIZE 1024
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namespace Kernel {
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class TTY : public CharacterDevice {
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public:
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virtual ~TTY() override;
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual int ioctl(FileDescription&, unsigned request, FlatPtr arg) override final;
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virtual String absolute_path(const FileDescription&) const override { return tty_name(); }
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virtual String const& tty_name() const = 0;
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unsigned short rows() const { return m_rows; }
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unsigned short columns() const { return m_columns; }
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ProcessGroupID pgid() const
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{
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if (auto pg = m_pg.strong_ref())
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return pg->pgid();
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return 0;
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}
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int set_termios(const termios&);
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bool should_generate_signals() const { return m_termios.c_lflag & ISIG; }
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bool should_flush_on_signal() const { return !(m_termios.c_lflag & NOFLSH); }
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bool should_echo_input() const { return m_termios.c_lflag & ECHO; }
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bool in_canonical_mode() const { return m_termios.c_lflag & ICANON; }
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void set_default_termios();
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void hang_up();
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// ^Device
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virtual mode_t required_mode() const override { return 0620; }
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protected:
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virtual ssize_t on_tty_write(const UserOrKernelBuffer&, ssize_t) = 0;
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void set_size(unsigned short columns, unsigned short rows);
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TTY(unsigned major, unsigned minor);
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void emit(u8, bool do_evaluate_block_conditions = false);
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virtual void echo(u8) = 0;
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bool can_do_backspace() const;
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void do_backspace();
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void erase_word();
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void erase_character();
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void kill_line();
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void flush_input();
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bool is_eol(u8) const;
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bool is_eof(u8) const;
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bool is_kill(u8) const;
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bool is_erase(u8) const;
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bool is_werase(u8) const;
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void generate_signal(int signal);
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int m_available_lines { 0 };
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private:
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// ^CharacterDevice
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virtual bool is_tty() const final override { return true; }
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CircularDeque<u8, TTY_BUFFER_SIZE> m_input_buffer;
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// FIXME: use something like AK::Bitmap but which takes a size template parameter
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u8 m_special_character_bitmask[TTY_BUFFER_SIZE / 8];
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WeakPtr<Process> m_original_process_parent;
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WeakPtr<ProcessGroup> m_pg;
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termios m_termios;
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unsigned short m_rows { 0 };
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unsigned short m_columns { 0 };
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};
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}
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