tty_port_open(9)

📦 version 7.3.1, in nixpkgs unstable

💖 tty_port_open(9) 💖

okay so bestie, welcome to the Kernel API Manual — this is the page for tty_port_open(9), and honestly? it's kind of the main character of tty opening. let's get into it ✨

🌸 NAME 🌸

tty_port_open — the generic tty->ops->open handler 🎀

✨ SYNOPSIS ✨

int tty_port_open (struct tty_port *port , struct tty_struct *tty ,
struct file *filp );

🦋 ARGUMENTS 🦋

  • port — the tty_port of the device, like its lil home base 🏠
  • tty — the tty that's getting opened, the one we're here for 💅
  • filp — the file pointer that got passed in 🫶

💜 DESCRIPTION 💜

so this is a generic helper — the whole point is that you drop it into your driver's tty->ops->open and it handles the vibe check for you. it activates the devices using port->ops->activate (only if they're not already active, no double-dipping 💀), and then it waits for the device to be ready using tty_port_block_til_ready — which is the part where it, like, raises DTR/CTS and waits for carrier. very "are you there bestie?" energy 😭

⚠️ heads up: port->ops->shutdown is not called when port->ops->activate returns an error. on the contrary, tty->ops->close is called. so don't get it twisted 🙈

Locking: the caller holds the tty lock. no cap, that's the rule 🔒

⭐ NOTE ⭐

it may drop and reacquire the tty lock (this happens in tty_port_block_til_ready), which means tty and port may have changed state while you weren't looking — like, they may be hung up now 😭 so don't assume everything's the same as when you left it, fr fr

🌈 SEE ALSO 🌈

Kernel file ./drivers/tty/tty_port.c

and the whole friend group 👑:

anyway that's the page bestie 🫶 this one lives in ./drivers/tty and it's dated October 2026 — so yeah, slightly future-coded of it, iconic honestly 💅✨ bye!! 🎀

📦 where this page comes from