svc_tcp_recvfrom(9)

💖 NAME 💖

okay bestie, welcome to the svc_tcp_recvfrom(9) page from the Kernel API Manual 💅 — it's literally all about receiving data from a TCP socket, and yes, we're gonna get into it.

svc_tcp_recvfrom — receive data from a TCP socket 🫶

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✨ SYNOPSIS ✨

int svc_tcp_recvfrom (struct svc_rqst *rqstp );

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🎀 ARGUMENTS 🎀

• rqstp — the request structure into which to receive an RPC Call. that's the whole vibe of this parameter, no cap 💖

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🦋 DESCRIPTION 🦋

so like, this one gets called in a loop when XPT_DATA has been set. periodt.

first it reads the 4-byte stream record marker, then it uses the record length in that marker to set up exactly the resources needed to receive the next RPC message into rqstp. iconic resource-planning behavior, honestly 🌸

the zero return case handles partial receives and callback Replies. and the state of a partial receive is preserved in the svc_sock for the next call to svc_tcp_recvfrom — so it picks up right where it left off, bestie 💫

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⭐ RETURN ⭐

on success, it gives you the number of bytes in a received RPC Call, or 0 if a complete RPC Call message was not ready to return. that's it, that's the return value 🎀

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🔥 SEE ALSO 🔥

the kernel file is ./net/sunrpc/svcsock.c — go check it out if you're feeling nosy 👀

• svc_tcp_release_ctxt(9)
• svc_udp_release_ctxt(9)
• svc_tcp_handshake_done(9)
• svc_tcp_handshake(9)
• svc_udp_recvfrom(9)
• svc_udp_sendto(9)
• svc_tcp_sendto(9)
• svc_addsock(9)

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okay bye bestie 💖 — source/version: ./net/sunrpc, date: October 2026, page: svc_tcp_recvfrom(9) ✨