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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | SEE ALSO | COLOPHON |
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io_uring_pr...eout_update(3) liburing Manual io_uring_pr...eout_update(3)
io_uring_prep_timeout_update - prepare a request to update an
existing timeout
#include <liburing.h>
void io_uring_prep_timeout_update(struct io_uring_sqe *sqe,
struct __kernel_timespec *ts,
__u64 user_data,
unsigned flags);
void io_uring_prep_timeout_remove(struct io_uring_sqe *sqe,
__u64 user_data,
unsigned flags);
These functions modify or cancel an existing timeout request. The
submission queue entry sqe is setup to arm a timeout update or
removal specified by user_data and with modifier flags given by
flags. Additionally, the update request includes a ts structure,
which contains new timeout information.
For an update request, the flags member may contain a bitmask of
the following values:
IORING_TIMEOUT_ABS
The value specified in ts is an absolute value rather than
a relative one.
IORING_TIMEOUT_BOOTTIME
The boottime clock source should be used.
IORING_TIMEOUT_REALTIME
The realtime clock source should be used.
IORING_TIMEOUT_ETIME_SUCCESS
Consider an expired timeout a success in terms of the
posted completion. Normally a timeout that triggers would
return in a -ETIME CQE res value.
The timeout remove command does not currently accept any flags.
None
These are the errors that are reported in the CQE res field. On
success, 0 is returned.
-ENOENT
The timeout identified by user_data could not be found. It
may be invalid, or triggered before the update or removal
request was processed.
-EALREADY
The timeout identified by user_data is already firing and
cannot be canceled.
-EINVAL
One of the fields set in the SQE was invalid. For example,
two clocksources were given, or the specified timeout
seconds or nanoseconds were < 0.
-EFAULT
io_uring was unable to access the data specified by ts.
As with any request that passes in data in a struct, that data
must remain valid until the request has been successfully
submitted. It need not remain valid until completion. Once a
request has been submitted, the in-kernel state is stable. Very
early kernels (5.4 and earlier) required state to be stable until
the completion occurred. Applications can test for this behavior
by inspecting the IORING_FEAT_SUBMIT_STABLE flag passed back from
io_uring_queue_init_params(3).
io_uring_get_sqe(3), io_uring_submit(3), io_uring_prep_timeout(3)
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 March 12, 2022 io_uring_pr...eout_update(3)
Pages that refer to this page: io_uring_prep_timeout(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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