io_uring_cq_eventfd_toggle(3)

✨ io_uring_cq_eventfd_toggle ✨

okay bestie, welcome to liburing's lil switch-flip function 💅 this one lives in section 3 of the manual, so it's a library call, not a command you type in your shell — keep that in mind 🎀

🌸 SYNOPSIS 🌸

#include <liburing.h>

int io_uring_cq_eventfd_toggle(struct io_uring *ring, bool enabled);

🦋 DESCRIPTION 🦋

so io_uring_cq_eventfd_toggle(3) is literally just a toggle for eventfd notifications on the io_uring instance you point at with ring 🫶

• if enabled is true, eventfd notifications are enabled ✨
• if enabled is false, they are disabled 🙈

lowkey important: you have to register an eventfd with the ring first, using io_uring_register_eventfd(3) or io_uring_register_eventfd_async(3), before this function will even work. no registered eventfd, no toggle, no cap 💀

when is this giving useful? it's the move when your app wants to temporarily stop receiving eventfd notifications — like, say, during a batch processing phase 🌈 super handy when you don't want to be pinged mid-grind, yk?

💖 RETURN VALUE 💖

returns 0 on success 🎉 on error, you get a negative errno value back:

• -EOPNOTSUPP — the kernel does not support toggling eventfd notifications, or no eventfd is registered 😭

👑 SEE ALSO 👑

• io_uring_register_eventfd(3)
• io_uring_register_eventfd_async(3)
• io_uring_cq_eventfd_enabled(3)

and that's the whole page, periodt 💅✨ go toggle ur notifications, main character 🦋

this was liburing-2.4, dated January 18, 2025, from the liburing Manual — mwah, stan 🎀💜