fn poll_add(self: *IO_Uring, user_data: u64, fd: os.fd_t, poll_mask: u32) !*linux.io_uring_sqe
Queues (but does not submit) an SQE to perform a poll(2). Returns a pointer to the SQE.
poll(2)
self: *IO_Uring,
user_data: u64,
fd: os.fd_t,
poll_mask: u32,