n_tty_close(9)

💖 n_tty_close(9) — Kernel API Manual, section 9 💖

okay so hi bestie 🫶 welcome to the Kernel API Manual (section 9, where the kernel girlies live), and today's main character is n_tty_close(9). she's short, she's iconic, and she's literally the shutdown bestie for a tty line discipline. let's get into it 💅

🎀 NAME 🎀

n_tty_close — close the ldisc for this tty ✨

🌸 SYNOPSIS 🌸

void n_tty_close (struct tty_struct *tty );

🦋 ARGUMENTS 🦋

• tty — the device, bestie. that's the whole vibe. 🎀

💜 DESCRIPTION 💜

okay so the terminal layer calls this function when this line discipline is being shut down — either because of a close or because of a discipline change. it's giving "packing up and leaving the group chat" energy, ngl. 💀

and the important part, fr fr: this function will not be called while other ldisc methods are in progress. so no overlapping chaos, no "not me interrupting your syscall" moment. the kernel said boundaries, periodt. 👑

🔥 SEE ALSO 🔥

kernel file ./drivers/tty/n_tty.c, plus the whole friend group:

• n_tty_kick_worker(9)
• n_tty_write_wakeup(9)
• put_tty_queue(9)
• reset_buffer_flags(9)
• n_tty_flush_buffer(9)
• is_utf8_continuation(9)
• is_continuation(9)
• do_output_char(9)
• process_output(9)
• process_output_block(9)
• __process_echoes(9)
• add_echo_byte(9)
• echo_move_back_col(9)
• echo_set_canon_col(9)
• echo_erase_tab(9)
• echo_char_raw(9)
• echo_char(9)
• finish_erasing(9)
• eraser(9)
• isig(9)
• n_tty_receive_break(9)
• n_tty_receive_overrun(9)
• n_tty_receive_parity_error(9)
• n_tty_receive_char_flow_ctrl(9)
• n_tty_receive_char(9)
• n_tty_receive_buf_common(9)
• n_tty_set_termios(9)
• n_tty_open(9)
• copy_from_read_buf(9)
• canon_copy_from_read_buf(9)
• job_control(9)
• n_tty_read(9)
• n_tty_write(9)
• n_tty_poll(9)
• n_tty_inherit_ops(9)

mwah 💋 that's the whole page! source/version vibes live at ./drivers/tty, dated October 2026, straight from the Kernel API Manual, section 9. bye bestie 🫶✨