io_uring_prep_uring_cmd(3)

💅 io_uring_prep_uring_cmd — prepare a uring_cmd request ✨

okay bestie, welcome to section 3 of the liburing Manual, we're talking about io_uring_prep_uring_cmd and honestly? it's giving "small function, big responsibility" 🎀

🌸 SYNOPSIS 🌸

#include <liburing.h>

void io_uring_prep_uring_cmd(struct io_uring_sqe *sqe,
                                           int cmd_op,
                                           int fd);

✨ DESCRIPTION ✨

So what does it actually do? The io_uring_prep_uring_cmd(3) function prepares a uring_cmd request — and yes, that one is fd specific, no cap. 🦋

The submission queue entry sqe gets set up to use the filedescriptor fd to send the file descriptor specific cmd_op. That's the whole vibe: you hand it a queue entry, you hand it a command op, you hand it a file descriptor, and it wires them up together. 💖

The reserved fields are initialized to 0. Other than that? the caller has to set up any submission queue entry's operation specific fields. That's on you, babe — this function does the baseline, not the whole glow-up. 🫶

lowkey important: this one only handles the reserved fields and the basics. anything operation specific in the SQE is your job. 💀

💜 RETURN VALUE 💜

None. Nothing. Zero. Not a single value returned, and that's on purpose, slay. ✨

🙈 ERRORS 🙈

None. No errors reported here, bestie — it just does the prep and hands it back. 🌈

👑 SEE ALSO 👑

• io_uring_prep_uring_cmd128(3)
• io_uring_get_sqe(3)
• io_uring_submit(3)

okay that's the whole page, you ate it, go set up your SQEs responsibly 💅

this was liburing-2.13, dated October 22, 2025 — mwah, take care of her 🎀