io_uring_get_sqe128(3)

✨ io_uring_get_sqe128(3) ✨

okay bestie, so this one's a liburing manual page 💖 — it lives in the liburing Manual and it's about grabbing yourself a chunky lil submission queue entry. let's get into it 💅

🌸 NAME 🌸

io_uring_get_sqe128 — get the next available 128-byte submission queue entry from the submission queue 🎀

🦋 SYNOPSIS 🦋

#include <liburing.h>

struct io_uring_sqe *io_uring_get_sqe128(struct io_uring *ring);

like, that's it. one function, one pointer, no drama ✨

💖 DESCRIPTION 💖

so io_uring_get_sqe128(3) gets the next available 128-byte submission queue entry from the submission queue that belongs to the ring in the param. yep, the ring param. that's the vibe 🌀

on success, io_uring_get_sqe128(3) returns a pointer to that submission queue entry. on failure, NULL gets returned. no in-between, no situationship 😭

if you do get an SQE back, bestie, you gotta fill it out — via one of the prep functions, like io_uring_prep_uring_cmd128(3) — and then submit it with io_uring_submit(3). that's the whole flow, no cap 🫶

⚠️ okay important thing: neither io_uring_get_sqe128(3) nor the prep functions set (or clear) the user_data field of the SQE. not even a little. 🙈 if you're expecting io_uring_cqe_get_data(3) or io_uring_cqe_get_data64(3) to hand you valid data when you're reaping IO completions, then io_uring_sqe_set_data(3) or io_uring_sqe_set_data64(3) MUST have been called before you submit the request. MUST. capital letters, periodt 👑

🌈 RETURN VALUE 🌈

io_uring_get_sqe128(3) returns a pointer to the next submission queue event on success, and NULL on failure.

and if you got NULL? lowkey here's why, one of two things:

• the SQ ring either wasn't created with support for 128-byte SQE entries — that's IORING_SETUP_SQE128 or IORING_SETUP_SQE_MIXED 🧚
• or it's currently full, and entries must be submitted for processing before new ones can get allocated 💀

so yeah, check your setup flags or check your fullness, bestie 🔥

🎀 SEE ALSO 🎀

• io_uring_get_sqe(3)
• io_uring_submit(3)
• io_uring_sqe_set_data(3)

and that's the whole page, angel 💜 this was liburing-2.13, dated October 22, 2025 — iconic, no notes, go submit something slay ✨💅🦋