tty_set_ldisc(9)

📦 version 7.3.1, in nixpkgs unstable

💜 tty_set_ldisc(9) 💜

okay bestie, welcome to the Kernel API Manual — we're doing tty_set_ldisc(9) today and honestly it's giving "small function, big responsibilities" ✨

🌸 NAME 🌸

tty_set_ldisc — set line discipline

like, literally just: set the line discipline. that's the whole gig. 🎀

✨ SYNOPSIS ✨

int tty_set_ldisc (struct tty_struct *tty , int disc );

🦋 ARGUMENTS 🦋

  • tty — the terminal you're setting. the main character terminal, if you will 👑
  • disc — the line discipline number. the vibe you're assigning to it 💅

🔥 DESCRIPTION 🔥

so the whole point: you're setting the discipline of a tty line. that's it, that's the function. 🫶

⚠️ real talk though: it must be called from a process context. no cap. don't try to be cute and call it from somewhere else, that's not the move 😭

ngl the ldisc change logic has to be kind of paranoid, and for good reason — it has to protect itself against:

  • any overlapping ldisc change (including a change happening on the other end of pty pairs 👀 the way that pty pair is also living its own life)
  • the close of one side of a tty/pty pair 💀
  • and eventually hangup 🙈

so yeah, it's guarding against a whole group chat of race conditions. slay that it handles it, but don't make its life harder. periodt.

🌈 SEE ALSO 🌈

Kernel file ./drivers/tty/tty_ldisc.c — and the whole ldisc friend group, which is honestly iconic 🧚:

🍓 ok that's the whole page bestie, go forth and set those disciplines responsibly 💖

from the ./drivers/tty directory, dated October 2026, this has been tty_set_ldisc(9) — mwah, ily, bye 💅✨

📦 where this page comes from