pn_insert
error = pn_insert(pnp, &linkpath, strlen(component));
error = pn_insert(&pn, &linkpath, strlen(nm));
error = pn_insert(pnp, &linkpath, strlen(component));
err = pn_insert(&upn, &link_pn,
extern int pn_insert(struct pathname *, struct pathname *, size_t);