_PATH_LOCKDIRNAME
char tbuf[sizeof(_PATH_LOCKDIRNAME) + MAXNAMLEN];
(void)snprintf(tbuf, sizeof tbuf, _PATH_LOCKDIRNAME, ttyname);
char tbuf[sizeof(_PATH_LOCKDIRNAME) + MAXNAMLEN];
(void)snprintf(tbuf, sizeof tbuf, _PATH_LOCKDIRNAME, ttyname);