Function lazy_socket::raw::select

pub fn select(
    read_fds: &[&Socket], 
    write_fds: &[&Socket], 
    except_fds: &[&Socket], 
    timeout_ms: Option<u64>
) -> Result<c_int>

Wrapper over system select

Returns number of sockets that are ready.

If timeout isn't specified then select will be a blocking call.