io_uring_prep_timeoute_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.
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 where given, or the specified timeout seconds or nanoseconds where < 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)
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Pages that refer to this page: io_uring_prep_timeout(3)