Function nf_download 

#[unsafe(no_mangle)]
pub(crate) unsafe extern "C" fn nf_download(
    context: *const Context,
    desc: &DownloadDesc,
    span: u32,
) -> bool

Asks for the download desc describes once the current event finishes, and shows it has begun in the state it binds. Its reports later go to the same places.

Safety

See the abi module’s contract; desc.bindings points to desc.len bindings, and each binding’s place and its steps are readable.