extern bool lockflag; /* Create lock file to lock the serial dev */
extern bool nodetach; /* Don't detach from controlling tty */
extern bool updetach; /* Detach from controlling tty when link up */
+extern bool master_detach; /* Detach when multilink master without link */
extern char *initializer; /* Script to initialize physical link */
extern char *connect_script; /* Script to establish physical link */
extern char *disconnect_script; /* Script to disestablish physical link */