tty_set_termios_ldisc(9)

📦 version 7.3.1, in nixpkgs unstable

💅 tty_set_termios_ldisc(9) — kernel API manual, but make it make sense

okay bestie so you found the man page for tty_set_termios_ldisc, and yes the name is a whole mouthful, but stick with me — this one's short and honestly kind of iconic in a tiny-little-helper way 🎀

✨ NAME ✨

tty_set_termios_ldisc — set ldisc field

that's it. that's the whole job. it sets the ldisc field. main character energy of a function that knows exactly what it is 💅

🦋 SYNOPSIS 🦋

void tty_set_termios_ldisc (struct tty_struct *tty , int disc );

look at her go. void return, two args, no drama 🌸

🍓 ARGUMENTS 🍓

  • tty — the tty structure, obvi. this is the thing getting its vibe updated ✨
  • disc — the line discipline number. just a plain int doing its little number thing 🔢

💖 DESCRIPTION 💖

so here's the tea: this is probably overkill for real-world processors, ngl. but!! they are not on hot paths, so a little discipline won't do any harm 🤭 yes that's the joke, the kernel devs ate with that one and i'm not gonna pretend they didn't 🫶

what it actually does: the line-discipline-related tty_struct fields get reset, so the ldisc driver can't go re-using stale information when it's setting up the new ldisc instance. no leftovers, no crusty old state, we clean the counter before the new customer sits down 😤✨

Locking: takes termios_rwsem 🔒 so like, be aware of that before you go waltzing in from somewhere weird, bestie 😭

🌈 SEE ALSO 🌈

kernel file ./drivers/tty/tty_ldisc.c — and honestly the whole ldisc friend group showed up, so get comfy:

like i said. the whole group chat 💀 but they're all worth a read, fr fr 📚

and that's a wrap, bestie 🎀 this lil page lives in ./drivers/tty and it's dated October 2026 — go forth and set that ldisc field responsibly, ily, mwah 💜🧚

📦 where this page comes from