svc_udp_recvfrom(9)

📦 version 7.3.1, in nixpkgs unstable

💌 svc_udp_recvfrom(9) — a Kernel API Manual moment

okay so bestie, welcome to the svc_udp_recvfrom(9) page 💅 she lives in the Kernel API Manual and honestly? she's a whole vibe. let's get into it 🎀

✨ NAME ✨

svc_udp_recvfrom — receive a datagram from a UDP socket 🦋

like, that's her whole job. one datagram at a time, no cap.

🌸 SYNOPSIS 🌸

int svc_udp_recvfrom (struct svc_rqst *rqstp );

yes that's literally it, she takes one thing and returns an int, iconic behavior tbh ✨

💖 ARGUMENTS 💖

  • rqstp — the request structure you're receiving an RPC Call into 🫶 like, this is the little basket she drops the call in. main character energy for real.

🧚 DESCRIPTION 🧚

so the way this works: she gets called in a loop whenever XPT_DATA has been set 🔥 that's it, that's the bit. loop + XPT_DATA = her time to shine, periodt.

⭐ RETURN ⭐

lowkey the important part, don't skip:

  • On success → the number of bytes in a received RPC Call 💯
  • Or → 0 if a complete RPC Call message was not ready to return 💀 (like, she's not done yet, come back later bestie)

👑 SEE ALSO 👑

kernel file ./net/sunrpc/svcsock.c — and her whole friend group fr fr:

go read them, iykyk 🌈

bestie reminder: if she returns 0, that does not mean "no bytes ever" — it means a complete RPC Call message wasn't ready to return. don't panic, just loop again 🙈

mwah, that's the whole page 💜 this lil beauty comes courtesy of ./net/sunrpc, dated October 2026, and she ate. no crumbs. 🍓✨

📦 where this page comes from