waitforack
error = waitforack(e, T_INFO_ACK, waitp, nosignal);
error = waitforack(e, T_OPTMGMT_ACK, &waitp, 1);
error = waitforack(e, T_OPTMGMT_ACK, &waitp, 1);
static int waitforack(calllist_t *, t_scalar_t, const struct timeval *, bool_t);