Function librdkafka_sys::rd_kafka_produce

pub unsafe extern "C" fn rd_kafka_produce(
    rkt: *mut rd_kafka_topic_t, 
    partition: int32_t, 
    msgflags: c_int, 
    payload: *mut c_void, 
    len: size_t, 
    key: *const c_void, 
    keylen: size_t, 
    msg_opaque: *mut c_void
) -> c_int