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NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_register_eventfd(3) liburing Manual io_uring_register_eventfd(3)
io_uring_register_eventfd - register an eventfd with a ring
#include <liburing.h>
int io_uring_register_eventfd(struct io_uring *ring,
int fd);
int io_uring_register_eventfd_async(struct io_uring *ring,
int fd);
int io_uring_unregister_eventfd(struct io_uring *ring);
io_uring_register_eventfd(3) registers the eventfd file descriptor
fd with the ring identified by ring.
Whenever completions are posted to the CQ ring, an eventfd
notification is generated with the registered eventfd descriptor.
If io_uring_register_eventfd_async(3) is used, only events that
completed out-of-line will trigger a notification.
It notifications are no longer desired,
io_uring_unregister_eventfd(3) may be called to remove the eventfd
registration. No eventfd argument is needed, as a ring can only
have a single eventfd registered.
While io_uring generally takes care to avoid spurious events, they
can occur. Similarly, batched completions of CQEs may only
trigger a single eventfd notification even if multiple CQEs are
posted. The application should make no assumptions on number of
events being available having a direct correlation to eventfd
notifications posted. An eventfd notification must thus only be
treated as a hint to check the CQ ring for completions.
Returns 0 on success, or -errno on error.
eventfd(2)
This page is part of the liburing (A library for io_uring)
project. Information about the project can be found at
⟨https://github.com/axboe/liburing⟩. If you have a bug report for
this manual page, send it to io-uring@vger.kernel.org. This page
was obtained from the project's upstream Git repository
⟨https://github.com/axboe/liburing⟩ on 2025-08-11. (At that time,
the date of the most recent commit that was found in the
repository was 2025-08-02.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
liburing-2.2 April 16, 2022 io_uring_register_eventfd(3)
Pages that refer to this page: io_uring_register_eventfd(3), io_uring_register_eventfd_async(3), io_uring_unregister_eventfd(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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