npppd_ppp_get_iface_name
const char *npppd_ppp_get_iface_name(npppd *, npppd_ppp *);
npppd_ppp_get_iface_name(_this->pppd, _this));
npppd_ppp_get_iface_name(_this->pppd, _this));
ipstr, npppd_ppp_get_iface_name(_this->pppd, _this),