getttynam
struct ttyent *getttynam(const char *);
return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag);
if (tty != NULL && (ty = getttynam(tty)) != NULL &&
te = getttynam(tty); /* Need group name */
typ = getttynam("console");
t = getttynam(ttyid);