set_termios(9)

set_termios(9) 💅

okay bestie, welcome to the Kernel API Manual page for set_termios — this is the tty termios helper, and we’re gonna get you comfy with it ✨

🌸 NAME 🌸

set_termios — set termios values for a tty

✨ SYNOPSIS ✨

int set_termios (struct tty_struct *tty , void __user *arg , int opt );

🎀 ARGUMENTS 🎀

here’s the little cast of arguments, no cap:

• tty — terminal device
• arg — user data
• opt — option information

🦋 DESCRIPTION 🦋

so set_termios is a helper function: it prepares the termios data and runs the necessary other functions before using tty_set_termios to do the actual changes 👑

Locking note 🫶: the called functions take the tty_struct->ldisc_sem and tty_struct->termios_rwsem locks.

💖 RETURN 💖

0 on success, an error otherwise 😭

🔥 SEE ALSO 🔥

kernel file: ./drivers/tty/tty_ioctl.c — and here’s the whole squad:

• tty_chars_in_buffer(9)
• tty_write_room(9)
• tty_driver_flush_buffer(9)
• tty_unthrottle(9)
• tty_throttle_safe(9)
• tty_unthrottle_safe(9)
• tty_wait_until_sent(9)
• tty_termios_copy_hw(9)
• tty_termios_hw_change(9)
• tty_get_char_size(9)
• tty_get_frame_size(9)
• tty_set_termios(9)
• set_sgttyb(9)
• tty_change_softcar(9)
• tty_mode_ioctl(9)

okay that’s the page, bestie — source/version: ./drivers/tty, dated October 2026 — bye and go set those termios values 💅✨