pub unsafe extern "C" fn rd_kafka_conf_set_background_event_cb(
conf: *mut rd_kafka_conf_t,
event_cb: Option<unsafe extern "C" fn(rk: *mut rd_kafka_t, rkev: *mut rd_kafka_event_t, opaque: *mut c_void)>
)
pub unsafe extern "C" fn rd_kafka_conf_set_background_event_cb(
conf: *mut rd_kafka_conf_t,
event_cb: Option<unsafe extern "C" fn(rk: *mut rd_kafka_t, rkev: *mut rd_kafka_event_t, opaque: *mut c_void)>
)