n_tty_write_wakeup(9)

💅 n_tty_write_wakeup(9) 💅

okay bestie, this one's from the Kernel API Manual and it's lowkey a tiny little function with main character energy. sit down, hydrate, let's go 🫶

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✨ NAME ✨

n_tty_write_wakeup — the asynchronous I/O notifier, aka the girl who taps you on the shoulder and goes "hey. wake up. ur async I/O is ready" 💖

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🌸 SYNOPSIS 🌸

void n_tty_write_wakeup (struct tty_struct *tty );

that's it. that's the whole signature. she's short, she's sweet, she returns void (so like, she gives nothing back and honestly? relatable) 🎀

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🦋 ARGUMENTS 🦋

• tty — the tty device, i.e. the actual terminal thing we're waking up. think of it as the phone number we're dialing 📞

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💜 DESCRIPTION 💜

so this one is required for the ptys, serial driver, etc. — no cap, it's not optional vibes, it's a need.

why? because processes that attach themselves to the master and rely on ASYNC IO must be woken up. that's literally the whole job. if you don't wake them, they just sit there in the group chat with no notifications on and never see the message 😭 so this function wakes them. periodt. 💅

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🔥 SEE ALSO 🔥

the whole extended universe, bestie — every single one of these is in the kernel file ./drivers/tty/n_tty.c:

• n_tty_kick_worker(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_close(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)

like, the entire n_tty friend group. go read them all, i'll wait 🍓

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ngl this whole page is like four sentences and yet it's load-bearing for ptys everywhere. iconic behavior honestly 👑

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aaaand that's the whole page, bestie!! source lives in ./drivers/tty, version stamped October 2026 — mwah, catch you in the next manpage 💋✨🧚