QB_IPCS_RESPONSE_SENDV(3)

📦
version 2.0.9 · 6 versions
, in fedora 44, ubuntu resolute, ubuntu stonking

💖 qb_ipcs_response_sendv(3) — libqb Programmer's Manual 💖

okay bestie, sit down, we're doing qb_ipcs_response_sendv from the libqb Programmer's Manual and honestly? she's a baddie. this is the function that sends a response back to an incoming request. the reply. the "hey i heard u" moment. 🫶

✨ NAME ✨

qb_ipcs_response_sendv — Send a response to a incoming request.

like. that's it. that's the whole job description and she does it flawlessly. 👑

🌸 SYNOPSIS 🌸

#include <qb/qbipcs.h>

ssize_t qb_ipcs_response_sendv(
    qb_ipcs_connection_t   *c,        /* connection instance */
    /*
     * the iovec struct that points to the message to send
     */
    const struct iovec     *iov,
    size_t                  iov_len   /* the number of iovecs. */
);

not me including the comments verbatim because i respect the source material 💅

🎀 PARAMS 🎀

  • c — connection instance. the connection, bestie. the one you're replying on. 🦋
  • iov — the iovec struct that points to the message to send. literally the message. pointing at it. that's the vibe.
  • iov_len — the number of iovecs. yes. how many of them. count them. ✨

💜 DESCRIPTION 💜

so here's the thing — upstream left this section completely blank. like, nothing. empty. a whole section with zero words in it. iconic honestly, she said "the name and the synopsis explain everything, goodbye." 🌈

i'm not gonna invent details that aren't there, because that's not the move. everything you actually need lives in PARAMS, RETURN VALUE, and NOTE down below. go read those, bestie, they ate. 🔥

🌟 RETURN VALUE 🌟

size sent or -errno for errors.

so: happy path gives you the size of what got sent. sad path gives you a negative errno. check that sign, always, no cap. 😭

⭐ NOTE ⭐

okay this one MATTERS, listen up 🚨

When send returns -EMSGSIZE, this means the msg is too large and will never succeed. like ever. it's not a "try again later" situation, it's a "this will never work, stop trying" situation. 💀

To determine the max msg size a client can be sent, use qb_ipcs_connection_get_buffer_size()

so if you get hit with -EMSGSIZE and you're out here retrying in a loop... bestie. no. go ask qb_ipcs_connection_get_buffer_size() what the actual limit is and resize your whole approach. 🙈

🌸 SEE ALSO 🌸

the whole friend group showed up, and every single one of them is getting named:

27 entries. i counted. all of them. none skipped. we do NOT gatekeep around here. 💖

Copyright (C) 2010-2020 Red Hat, Inc.

and that's the whole page, bestie!! 💅 the manual page itself is from LIBQB, dated 2025-09-16, and lives at QB_IPCS_RESPONSE_SENDV(3) — go forth, send those responses, and remember: if it says -EMSGSIZE, it's a forever-no, not a maybe. 🦋✨ mwah. 🎀

📦 where this page comes from