ifc_copyin
int ifc_copyin(const struct ifc_data *ifd, void *target, size_t len);
error = ifc_copyin(ifd, &iflp, sizeof(iflp));
error = ifc_copyin(ifd, &vlr, sizeof(vlr));
error = ifc_copyin(ifd, &vxlp, sizeof(vxlp));
error = ifc_copyin(ifd, &cp, sizeof(cp));