tty_termios_hw_change(9)

📦 version 7.3.1, in nixpkgs unstable

✨ tty_termios_hw_change — check for setting change ✨

okay so bestie, this is a page from the Kernel API Manual (that's the 9 section, for the uninitiated 💅), and it's literally just one tiny little function that does a vibe check on two termios structs. short page, but we're gonna give it the attention it deserves 🫶

🌸 SYNOPSIS 🌸

bool tty_termios_hw_change (const struct ktermios *a , const struct ktermios *b );

🎀 ARGUMENTS 🎀

  • a — a termios, the first one, our main character ✨
  • b — the termios to compare it against, the one getting the vibe check 🔍

💖 DESCRIPTION 💖

So what this does is: it checks if any of the bits that affect a dumb device have changed between the two termios structures, or if a speed change is needed. that's it. that's the whole job. no cap 😌

like, you hand it a and b, it looks at the dumb-device bits and the speed, and it tells you whether anything moved. lowkey iconic for how small it is 👑

🔥 RETURN 🔥

  • true if change is needed 💀 (yes, that's the only thing it returns — it's bool, it's not out here being complicated)

🦋 SEE ALSO 🦋

the kernel file ./drivers/tty/tty_ioctl.c is where the magic lives, and here's the whole friend group of related pages, no gatekeeping 🌈

ngl there's no BUGS section on this one, no ENVIRONMENT, no EXIT STATUS — it's a bool-returning kernel helper, bestie, it just tells you true or it doesn't. go read the SEE ALSO list if you want more lore 📚

and that's the whole page 💜 it lives under ./drivers/tty, dated October 2026, courtesy of the Kernel API Manual — go off, kernel devs, slay 🧚‍♀️⭐

📦 where this page comes from