tty_hung_up_p(9)

💖 tty_hung_up_p(9) — Kernel API Manual, bestie edition 💖

Okay so we're in the Kernel API Manual today, and the icon we're stanning is tty_hung_up_p. Say it with me: was tty hung up? That's it, that's the whole vibe check. 🎀

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✨ NAME ✨

tty_hung_up_p — literally just checking: was this tty hung up? 👀

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🦋 SYNOPSIS 🦋

int tty_hung_up_p (struct file *filp );

She takes one arg and hands you back an int. No cap. 💅

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🌸 ARGUMENTS 🌸

• filp — the file pointer of the tty. Like, the actual tty file pointer, hand it over 🫶

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⭐ RETURN ⭐

Returns true if the tty has been subject to a vhangup or a carrier loss. So if it got hung up on (deliberately or because the carrier dipped 😭), you get true. That's the whole tea. 🔥

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💜 SEE ALSO 💜

The kernel file you wanna peek at is ./drivers/tty/tty_io.c, and honestly the whole tty friend group is here — go say hi to all of them:

• 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), 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), tiocgetd(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)

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Bestie reminder: this is the <italic>was it hung up?</italic> check, not the <italic>hang it up</italic> action. Different function, different moment, iykyk 💀

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And that's the whole page, periodt! 🧚 This one ships from ./drivers/tty, dated October 2026, and yes it's still filed under tty_hung_up_p(9) — slay. 💖