Function ncdirect_get_nblock 

pub fn ncdirect_get_nblock(
    ncd: &mut NcDirect,
    input: Option<&mut NcInput>,
) -> NcResult_i32

Reads input without blocking.

Will optionally write the event details in input.

If no event is ready, returns 0.

In case of an invalid read (including on EOF) -1 is returned.

Method: NcDirect.get_nblock().