n_hdlc_tty_receive(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 n_hdlc_tty_receive 🎀

okay bestie, welcome to the Kernel API Manual entry for n_hdlc_tty_receive(9) — yes that's the full name, yes it's a mouthful, no we're not shortening it, it's iconic as is 💅

✨ NAME ✨

n_hdlc_tty_receive — literally the function your tty driver calls when there's receive data ready to go. That's the whole job. She's a notifier, not a personality 😌

🌸 SYNOPSIS 🌸

void n_hdlc_tty_receive (struct tty_struct *tty , const u8 *data , const
u8 *flags , size_t count );

she returns void, meaning she gives you nothing back — no return value, no drama, no cap. The vibes are the gift 🫶

🦋 ARGUMENTS 🦋

  • tty — pointer to the tty instance data. it's giving "which tty are we even talking about" energy, and honestly? valid question. this answers it 👑
  • data — pointer to the received data. the actual payload, the main character of this whole operation ⭐
  • flags — pointer to flags for data. lil metadata bestie riding along with the data 🎀
  • count — count of received data in bytes. so you know exactly how much data you're dealing with, no guessing, no vibes-based sizing 🙈

💖 DESCRIPTION 💖

so here's the tea ☕ — this function gets called by the tty low level driver when receive data is available. that's it, that's the trigger. data shows up, she gets the call 📞

and the important part, the part you cannot skip: the data is interpreted as one HDLC frame. one. single. frame. whole thing. no splitting, no "eh close enough", it's one frame periodt 🔥

like, that's the whole contract bestie, don't come for her with half a frame 💀

🌈 SEE ALSO 🌈

okay this list is LONG but every single one of these is a real one, so let's go, no skipping, we respect the whole squad 🫡

Kernel file ./drivers/tty/n_hdlc.c plus:

that's the whole friend group, go read them, iykyk 💜

and that's a wrap bestie!! this lil page comes to you from ./drivers/tty, dated October 2026, under the Kernel API Manual banner — slay, ate, left absolutely no crumbs 🧚‍♀️✨💖

📦 where this page comes from