npf_config_retrieve
ncf = npf_config_retrieve(fd);
nl_config_t * npf_config_retrieve(int);
if ((ncf = npf_config_retrieve(fd)) == NULL) {
ncf = npf_config_retrieve(fd);
if ((ncf = npf_config_retrieve(fd)) == NULL) {
ncf = npf_config_retrieve(fd);