tiocgetd(9)

okay so bestie, welcome to this iconic little page for tiocgetd(9) from the Kernel API Manual — it's giving tiny-but-important tty lore 🎀✨

🦋 NAME 🦋

• tiocgetd — get line discipline 💅

✨ SYNOPSIS ✨

Here's the exact signature, no cap:

int tiocgetd (struct tty_struct *tty , int __user *p );

🫶 ARGUMENTS 🫶

• tty — tty device 🌸
• p — pointer to user data 🍓

💖 DESCRIPTION 💖

So what does it do? It retrieves the line discipline id directly from the ldisc. That's the whole slay — no detours, just the ldisc handing over its id like a bestie passing you your iced coffee 🧋✨

Locking: waits for ldisc reference (in case the line discipline is changing or the tty is being hungup) ☕💀

So yeah, if the line discipline is mid-glow-up or the tty is being hungup, this one waits for that ldisc reference. Periodt.

🌈 SEE ALSO 🌈

Kernel file: ./drivers/tty/tty_io.c 👑

The whole tty crew is here, and yes, we're listing every single one because nobody gets left on read 💅:

• free_tty_struct(9)
• tty_free_file(9)
• tty_name(9)
• get_tty_driver(9)
• tty_dev_name_to_number(9)
• tty_find_polling_driver(9)
• tty_wakeup(9)
• tty_release_redirect(9)
• __tty_hangup(9)
• tty_hangup(9)
• tty_vhangup(9)
• tty_vhangup_self(9)
• tty_vhangup_session(9)
• tty_hung_up_p(9)
• stop_tty(9)
• start_tty(9)
• tty_read(9)
• tty_write(9)
• tty_send_xchar(9)
• pty_line_name(9)
• tty_line_name(9)
• tty_driver_lookup_tty(9)
• tty_init_termios(9)
• tty_standard_install(9)
• tty_driver_install_tty(9)
• tty_driver_remove_tty(9)
• tty_reopen(9)
• tty_init_dev(9)
• tty_save_termios(9)
• tty_flush_works(9)
• release_one_tty(9)
• tty_kref_put(9)
• release_tty(9)
• tty_release_checks(9)
• tty_kclose(9)
• tty_release_struct(9)
• tty_release(9)
• tty_open_current_tty(9)
• tty_lookup_driver(9)
• tty_kopen_exclusive(9)
• tty_kopen_shared(9)
• tty_open_by_driver(9)
• tty_open(9)
• tty_poll(9)
• tiocsti(9)
• tiocgwinsz(9)
• tty_do_resize(9)
• tiocswinsz(9)
• tioccons(9)
• tiocsetd(9)
• send_break(9)
• tty_get_tiocm(9)
• tty_tiocmget(9)
• tty_tiocmset(9)
• tty_get_icount(9)
• alloc_tty_struct(9)
• tty_put_char(9)
• tty_register_device(9)
• tty_register_device_attr(9)
• tty_unregister_device(9)
• __tty_alloc_driver(9)
• tty_driver_kref_put(9)
• tty_register_driver(9)
• tty_unregister_driver(9)

mwah 💋 this page is brought to you by source/version ./drivers/tty, dated October 2026, and it's literally tiocgetd(9) — catch you in the tty group chat 🫶🎀