How does io_uring_prep_timeout_remove know what to remove?

[Oipo]

I'm having a hard time deciphering the io_uring_prep_timeout_remove man page.

If I create a new timer like so:

auto *sqe = io_uring_get_sqe(ring);
io_uring_sqe_set_data(sqe, new SomeInternalStructWithCallback{...});
io_uring_prep_timeout(sqe, &_timespec, 0, 0); //_timespec is some long-lived variable in my class

How do I then remove the timeout?

[axboe]

See the man page for io_uring_prep_cancel() and related helpers, you can cancel any request based on a number of criteria. You don't need to use timeout_remove helpers, though you can.

[Oipo]

Aaah, gotcha. Thanks!