io_uring_unregister_ring_fd(3)

💖 io_uring_unregister_ring_fd — the liburing manual, but make it make sense 💖

okay bestie, so this is a page from the liburing Manual (yes, the <liburing.h> girlies know) and today we're talking about io_uring_unregister_ring_fd(3). it's giving "spring cleaning for your ring fd" and honestly? iconic behavior. ✨

🌸 NAME 🌸

io_uring_unregister_ring_fd — unregister a ring file descriptor 🎀

✨ SYNOPSIS ✨

#include <liburing.h>

int io_uring_unregister_ring_fd(struct io_uring *ring);

that's it. one include, one function, one lil struct io_uring *ring bestie. slay. 💅

🦋 DESCRIPTION 🦋

so io_uring_unregister_ring_fd(3) does exactly what it says on the tin: it unregisters the file descriptor of the ring. periodt.

more specifically — it unregisters a ring descriptor that was previously registered with the task. you know, the one you set up with its whole registration moment earlier. 🫶

and here's the tea, this happens automatically when io_uring_queue_exit(3) is called — so if you're just tearing everything down, the kernel's got you, no manual unregister needed. BUT. you can also call it yourself, and the reason you'd do that is to free up space for new ring registrations. like, there's a limited number of these and sometimes you gotta clear the shelf before you put new stuff on it, iykyk. 💀

wanna know more about ring descriptor registration as a concept? the og lore lives in io_uring_register_ring_fd(3) — go read that one, it's the prequel. 📖

🔥 RETURN VALUE 🔥

• 1 on success — and yes that literally means one file descriptor was unregistered, so it's a count not just a "yay". cute, right? 💖
• -errno on error — so a negative errno value, as a treat. 😭

👑 SEE ALSO 👑

• io_uring_register_ring_fd(3)
• io_uring_register_files(3)

go read those too bestie, the lore is deep and the vibes are immaculate. 🌈

heads up fr fr: this page is from liburing-2.2, dated March 11, 2022 🎀

okay that's the whole page, you ate it, no crumbs left. go unregister something responsibly. bye bestie!! 💜🦋✨