getmntname
if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
if ((name = getmntname(mntpt, MNTFROM, &type)) == NULL) {
if ((mntpt = getmntname(name, MNTON, &type)) == NULL) {
static char *getmntname(const char *, mntwhat, char **);