mux_get_mctrl(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mux_get_mctrl — Kernel API Manual, bestie edition 🎀

Ok so real talk, this is mux_get_mctrl(9) from the Kernel API Manual, and it's lowkey one of the easiest pages you'll ever read. Let's get into it ✨

🌸 NAME 🌸

mux_get_mctrl — returns the current state of modem control inputs. That's it. That's the whole job. Iconic, honestly 🫶

✨ SYNOPSIS ✨

unsigned int mux_get_mctrl (struct uart_port *port );

🦋 ARGUMENTS 🦋

  • port — ptr to the uart_port. Just a pointer to your uart_port, bestie, no cap 💖

💜 DESCRIPTION 💜

So here's the tea ☕ — the Serial MUX does not support CTS, DCD or DSR. Like, at all. Not a vibe it does.

Which means those lines are treated as permanently active. Always on. Forever. Main character energy that never turns off 👑✨

🎀 SEE ALSO 🎀

Kernel file ./drivers/tty/serial/mux.c, plus the whole friend group:

Go read all of them, iykyk 😭 they're all sitting in ./drivers/tty/serial together like one big happy family 🌈

That's the whole page, bestie, you ate that 💅✨ Sourced from ./drivers/tty/serial, dated October 2026 — love that for us 🍓🦋 mwah, go read a real man page now 💖

📦 where this page comes from