--- xinu/sys/control.c	2018/04/24 17:39:03	1.1.1.1
+++ xinu/sys/control.c	2018/04/24 17:39:38	1.1.1.2
@@ -8,12 +8,15 @@
  *  control  -  control a device (e.g., set the mode)
  *------------------------------------------------------------------------
  */
-SYSCALL	control(descrp, func, addr, addr2)
+control(descrp, func, addr, addr2)
 int descrp, func;
 char *addr,*addr2;
 {
 	struct	devsw	*devptr;
 
+#ifdef	DEBUG
+	dotrace("control", &descrp, 4);
+#endif
 	if (isbaddev(descrp) )
 		return(SYSERR);
 	devptr = &devtab[descrp];