tty_ldisc_ref(9)

💅 tty_ldisc_ref(9) — the kernel API manual, bestie edition

okay so welcome to tty_ldisc_ref(9) from the Kernel API Manual ✨ this one's short and sweet, but it's lowkey important, so pay attention 🫶

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🌸 NAME 🌸

tty_ldisc_ref — get the tty ldisc 💖

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🎀 SYNOPSIS 🎀

struct tty_ldisc * tty_ldisc_ref (struct tty_struct *tty );

like look at that signature. immaculate. no cap 💅

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🦋 ARGUMENTS 🦋

• tty — the tty device, bestie. that's the whole argument. one (1) tty device, and it's yours 🌈

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✨ DESCRIPTION ✨

so what does it actually do? it dereferences the line discipline for the terminal and takes a reference to it. very demure, very mindful 🎀

and then — this is the part you need to know — if the line discipline is in flux then it returns NULL. so like... check for NULL, okay? don't be out here dereferencing a maybe-nothing, i'm begging 😭

the good news? it can be called from IRQ and timer functions 👑 so you're safe in interrupt context, slay.

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🔥 SEE ALSO 🔥

kernel file ./drivers/tty/tty_ldisc.c — and literally the whole ldisc friend group, they all showed up:

• tty_register_ldisc(9)
• tty_unregister_ldisc(9)
• tty_ldisc_get(9)
• tty_ldisc_put(9)
• tty_ldisc_ref_wait(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)

iykyk 💜

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ok that's the page!! short king of a manpage fr fr 🍓 go forth and tty_ldisc_ref responsibly, and remember: flux means NULL means check it 💀

this masterpiece lives in ./drivers/tty and it's dated October 2026 🌸 mwah, bye bestie 💖🧚‍♀️