tty_ldisc_get(9)

💖 tty_ldisc_get(9) — Kernel API Manual 💖

okay bestie, welcome to the kernel API manual for tty_ldisc_get(9) — it's giving “grab a reference to an ldisc” energy, and we're gonna get through it together 💅

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✨ NAME ✨

tty_ldisc_get — take a reference to an ldisc. periodt.

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🌸 SYNOPSIS 🌸

struct tty_ldisc * tty_ldisc_get (struct tty_struct *tty , int disc );

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🎀 ARGUMENTS 🎀

• tty — the tty device, bestie.
• disc — the ldisc number. yes, that's the whole vibe.

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🦋 DESCRIPTION 🦋

so this function takes a reference to a line discipline. it deals with refcounts and module locking counts. if the discipline is not available, its module gets loaded, if possible. no cap.

Locking: it takes tty_ldiscs_lock to guard against ldisc races. iconic behavior, honestly.

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⭐ RETURN ⭐

• -EINVAL if the discipline index is not [N_TTY .. NR_LDISCS] or if the discipline is not registered.
• -EAGAIN if request_module failed to load or register the discipline.
• -ENOMEM if allocation failure. 😭
• Otherwise, it returns a pointer to the discipline and bumps the ref count. slay.

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/tty/tty_ldisc.c — and here are all the linked besties:

• tty_register_ldisc(9)
• tty_unregister_ldisc(9)
• tty_ldisc_put(9)
• tty_ldisc_ref_wait(9)
• tty_ldisc_ref(9)
• tty_ldisc_deref(9)
• tty_ldisc_flush(9)
• tty_set_termios_ldisc(9)
• tty_ldisc_open(9)
• tty_ldisc_close(9)
• tty_ldisc_failto(9)
• tty_ldisc_restore(9)
• tty_set_ldisc(9)
• tty_ldisc_kill(9)
• tty_reset_termios(9)
• tty_ldisc_reinit(9)
• tty_ldisc_hangup(9)
• tty_ldisc_setup(9)
• tty_ldisc_release(9)
• tty_ldisc_init(9)
• tty_ldisc_deinit(9)

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💅 source/version: ./drivers/tty · date: October 2026 · bye bestie, go take that reference responsibly 🫶