Function sieve 

pub fn sieve(
    input: SieveInput<'_>,
    table: &FilterTable,
    site: &mut OffloadSite<'_>,
    history: &mut SieveHistory,
) -> Result<Sieved, AxError>

Sieves one command output. Order and parameters are the SPEC’s; the tee runs before any stage, and the history is updated whether or not anything was cut, so the next call can difference against this one. Passed carries the input unchanged.