p9_client_zc_rpc(9)

📦 version 7.3.1, in nixpkgs unstable

💅 p9_client_zc_rpc — kernel API manual, but make it make sense

okay so bestie, welcome to the p9_client_zc_rpc(9) page — yes that's the manual name, it's a kernel API manual situation, and we're about to read it together like it's the group chat 🫶

This one is literally the zero-copy request girlie: you fire off a request and then you wait for the response. Iconic behaviour. 🎀

✨ NAME ✨

p9_client_zc_rpc — issue a request and wait for a response

no cap, that's the whole personality: you send it, you sit there, you get your answer back. 💅

🦋 SYNOPSIS 🦋

struct p9_req_t * p9_client_zc_rpc (struct p9_client *c , int8_t type ,
struct iov_iter *uidata , struct iov_iter *uodata , int inlen , int olen
, int in_hdrlen , const char *fmt , ... );

look at her. nine things to pass and one of them is ... which is giving "and friends" energy 😭

🌸 ARGUMENTS 🌸

  • c — the client session. your main character. everything happens inside her 💖
  • type — type of request. what kind of message we're sending, k? ✨
  • uidata — destination for zero copy read. the read data lands here, zero copy, we do not copy, we do not pass go 🎀
  • uodata — source for zero copy write. the write data comes from here. same deal, no copying, obsessed 🦋
  • inlen — read buffer size. how big the read side is 🌸
  • olen — write buffer size. how big the write side is 🌈
  • in_hdrlen — reader header size. and ngl, the page spells it out for us: This is the size of response protocol data — so it's the size of the response protocol data, periodt 👑
  • fmt — protocol format string (see protocol.c). the little formatting blueprint, iykyk ⭐
  • ... — variable arguments. the extra lil besties that go with fmt 💜

🔥 DESCRIPTION 🔥

Returns request structure (which client must free using p9_req_put)

💀 bestie please do not forget the p9_req_put — the client must free it. that's not a suggestion, that's the rule. free your request or it just sits there in memory being messy 🙈

🧚 SEE ALSO 🧚

Kernel file ./net/9p/client.c — that's where the actual lore lives, go read her 🫶

the whole friend group, fr fr 💅✨

and that's the page!! sign-off time: this lil gem lives under ./net/9p, it's dated October 2026, and it comes to you from the Kernel API Manual 💖 slay, go free your requests, ily, bye 🎀🦋

📦 where this page comes from