pub unsafe fn io_uring_sqe_set_data64(sqe: *mut io_uring_sqe, data: u64)Expand description
Set user data for submission queue event
§DESCRIPTION
The io_uring_sqe_set_data function stores a user_data pointer with the submission queue entry sqe.
The io_uring_sqe_set_data64 function stores a 64-bit data value with the submission queue entry sqe.
After the caller has requested a submission queue entry (SQE) with io_uring_get_sqe, they can associate a data pointer or value with the SQE. Once the completion arrives, the function io_uring_cqe_get_data or io_uring_cqe_get_data64 can be called to retrieve the data pointer or value associated with the submitted request.
Note that if neither of these functions are called, or the user_data field in the sqe isn’t set manually either, then the field may contain a value from a previous use of this sqe. If an application relies on always having a valid user_data value present, it must always assign one to each sqe.
§RETURN VALUE
None