Function io_uring_prep_splice 

pub unsafe extern "C" fn io_uring_prep_splice(
    sqe: *mut io_uring_sqe,
    fd_in: c_int,
    off_in: i64,
    fd_out: c_int,
    off_out: i64,
    nbytes: c_uint,
    splice_flags: c_uint,
)