diff --git a/sys/netccitt/hd_debug.c b/sys/netccitt/hd_debug.c
index 058a21caaff7..bfd63a1bae03 100644
--- a/sys/netccitt/hd_debug.c
+++ b/sys/netccitt/hd_debug.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)hd_debug.c	8.1 (Berkeley) 6/10/93
- * $Id$
+ * $Id: hd_debug.c,v 1.2 1994/08/02 07:46:59 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -68,8 +68,10 @@ struct	hdlctrace {
 int	lasttracelogged, freezetrace;
 #endif
 
+void
 hd_trace (hdp, direction, frame)
 struct hdcb *hdp;
+int direction;
 register struct Hdlc_frame *frame;
 {
 	register char *s;
diff --git a/sys/netccitt/hd_input.c b/sys/netccitt/hd_input.c
index 9bdab0b72f94..b547ffd6b8e6 100644
--- a/sys/netccitt/hd_input.c
+++ b/sys/netccitt/hd_input.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)hd_input.c	8.1 (Berkeley) 6/10/93
- * $Id$
+ * $Id: hd_input.c,v 1.2 1994/08/02 07:47:01 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -55,9 +55,11 @@
 #include <netccitt/hd_var.h>
 #include <netccitt/x25.h>
 
-static frame_reject();
-static rej_routine();
-static free_iframes();
+static void frame_reject();
+static void rej_routine();
+static void free_iframes();
+void	process_sframe ();
+
 /*
  *      HDLC INPUT INTERFACE
  *
@@ -65,6 +67,7 @@ static free_iframes();
  *      completed reading a frame.
  */
 
+void
 hdintr ()
 {
 	register struct mbuf *m;
@@ -116,6 +119,7 @@ hdintr ()
 	}
 }
 
+int
 process_rxframe (hdp, fbuf)
 register struct hdcb *hdp;
 register struct mbuf *fbuf;
@@ -314,6 +318,7 @@ register struct mbuf *fbuf;
 	return (queued);
 }
 
+int
 process_iframe (hdp, fbuf, frame)
 register struct hdcb *hdp;
 struct mbuf *fbuf;
@@ -442,9 +447,10 @@ int     rear,
  *  condition Y (frame length error) are handled elsewhere.
  */
 
-static
+static void
 frame_reject (hdp, rejectcode, frame)
 struct hdcb *hdp;
+int rejectcode;
 struct Hdlc_iframe *frame;
 {
 	register struct Frmr_frame *frmr = &hd_frmr;
@@ -489,6 +495,7 @@ struct Hdlc_iframe *frame;
  *  frames is done here.
  */
 
+void
 process_sframe (hdp, frame, frametype)
 register struct hdcb *hdp;
 register struct Hdlc_sframe *frame;
@@ -547,6 +554,7 @@ int frametype;
 bool
 valid_nr (hdp, nr, finalbit)
 register struct hdcb *hdp;
+int nr;
 register int finalbit;
 {
 	/* Make sure it really does acknowledge something. */
@@ -591,7 +599,7 @@ register int finalbit;
  *  It then resets the Send State Variable V(S) to accomplish this.
  */
 
-static
+static void
 rej_routine (hdp, rejnr)
 register struct hdcb *hdp;
 register int rejnr;
@@ -635,7 +643,7 @@ register int rejnr;
  *  when a previously written iframe is acknowledged.
  */
 
-static
+static void
 free_iframes (hdp, nr, finalbit)
 register struct hdcb *hdp;
 int *nr;
diff --git a/sys/netccitt/hd_output.c b/sys/netccitt/hd_output.c
index c1db5f08a15d..08530ad747d2 100644
--- a/sys/netccitt/hd_output.c
+++ b/sys/netccitt/hd_output.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)hd_output.c	8.1 (Berkeley) 6/10/93
- * $Id$
+ * $Id: hd_output.c,v 1.2 1994/08/02 07:47:05 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -64,6 +64,39 @@
  *      by the input and control routines of the HDLC layer.
  */
 
+void
+hd_start (hdp)
+register struct hdcb *hdp;
+{
+	register struct mbuf *m;
+
+	/* 
+	 * The iframe is only transmitted if all these conditions are FALSE.
+	 * The iframe remains queued (hdp->hd_txq) however and will be
+	 * transmitted as soon as these conditions are cleared.
+	 */
+
+	while (!(hdp->hd_condition & (TIMER_RECOVERY_CONDITION | REMOTE_RNR_CONDITION | REJ_CONDITION))) {
+		if (hdp->hd_vs == (hdp->hd_lastrxnr + hdp->hd_xcp->xc_lwsize) % MODULUS) {
+
+			/* We have now exceeded the  maximum  number  of 
+			   outstanding iframes. Therefore,  we must wait 
+			   until  at least  one is acknowledged if this 
+			   condition  is not  turned off before we are
+			   requested to write another iframe. */
+			hdp->hd_window_condition++;
+			break;
+		}
+
+		/* hd_remove top iframe from transmit queue. */
+		if ((m = hd_remove (&hdp->hd_txq)) == NULL)
+			break;
+
+		hd_send_iframe (hdp, m, POLLOFF);
+	}
+}
+
+void
 hd_output (hdp, m0)
 register struct hdcb *hdp;
 struct mbuf *m0;
@@ -100,37 +133,6 @@ struct mbuf *m0;
 	hd_start (hdp);
 }
 
-hd_start (hdp)
-register struct hdcb *hdp;
-{
-	register struct mbuf *m;
-
-	/* 
-	 * The iframe is only transmitted if all these conditions are FALSE.
-	 * The iframe remains queued (hdp->hd_txq) however and will be
-	 * transmitted as soon as these conditions are cleared.
-	 */
-
-	while (!(hdp->hd_condition & (TIMER_RECOVERY_CONDITION | REMOTE_RNR_CONDITION | REJ_CONDITION))) {
-		if (hdp->hd_vs == (hdp->hd_lastrxnr + hdp->hd_xcp->xc_lwsize) % MODULUS) {
-
-			/* We have now exceeded the  maximum  number  of 
-			   outstanding iframes. Therefore,  we must wait 
-			   until  at least  one is acknowledged if this 
-			   condition  is not  turned off before we are
-			   requested to write another iframe. */
-			hdp->hd_window_condition++;
-			break;
-		}
-
-		/* hd_remove top iframe from transmit queue. */
-		if ((m = hd_remove (&hdp->hd_txq)) == NULL)
-			break;
-
-		hd_send_iframe (hdp, m, POLLOFF);
-	}
-}
-
 /* 
  *  This procedure is passed a buffer descriptor for an iframe. It builds
  *  the rest of the control part of the frame and then writes it out.  It
@@ -141,6 +143,7 @@ register struct hdcb *hdp;
  *       of old frames is required.
  */
 
+void
 hd_send_iframe (hdp, buf, poll_bit)
 register struct hdcb *hdp;
 register struct mbuf *buf;
@@ -192,6 +195,7 @@ int poll_bit;
 	SET_TIMER (hdp);
 }
 
+void
 hd_ifoutput(hdp, m)
 register struct mbuf *m;
 register struct hdcb *hdp;
@@ -222,6 +226,7 @@ register struct hdcb *hdp;
  *  received an acknowledgement for a iframe.
  */
 
+void
 hd_resend_iframe (hdp)
 register struct hdcb *hdp;
 {
diff --git a/sys/netccitt/hd_subr.c b/sys/netccitt/hd_subr.c
index 7d051274a37a..6dcfe2f155fa 100644
--- a/sys/netccitt/hd_subr.c
+++ b/sys/netccitt/hd_subr.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)hd_subr.c	8.1 (Berkeley) 6/10/93
- * $Id$
+ * $Id: hd_subr.c,v 1.2 1994/08/02 07:47:07 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -57,13 +57,16 @@
 #include <netccitt/x25.h>
 #include <netccitt/pk_var.h>
 
+void
 hd_init ()
 {
 
 	hdintrq.ifq_maxlen = IFQ_MAXLEN;
 }
 
+int
 hd_ctlinput (prc, addr)
+int prc;
 struct sockaddr *addr;
 {
 	register struct x25config *xcp = (struct x25config *)addr;
@@ -71,6 +74,8 @@ struct sockaddr *addr;
 	register struct ifaddr *ifa;
 	struct ifnet *ifp;
 	caddr_t pk_newlink();
+	void hd_writeinternal();
+	void hd_message();
 
 	if (addr->sa_family != AF_CCITT)
 		return (EAFNOSUPPORT);
@@ -148,6 +153,7 @@ struct sockaddr *addr;
 	return (0);
 }
 
+void
 hd_initvars (hdp)
 register struct hdcb *hdp;
 {
@@ -174,6 +180,7 @@ register struct hdcb *hdp;
 	hdp->hd_condition = 0;
 }
 
+int
 hd_decode (hdp, frame)
 register struct hdcb *hdp;
 struct Hdlc_frame *frame;
@@ -239,6 +246,7 @@ struct Hdlc_frame *frame;
  *  Only supervisory or unnumbered frames are processed.
  */
 
+void
 hd_writeinternal (hdp, frametype, pf)
 register struct hdcb *hdp;
 register int frametype, pf;
@@ -247,6 +255,7 @@ register int frametype, pf;
 	struct Hdlc_frame *frame;
 	register struct Hdlc_sframe *sframe;
 	register struct Hdlc_uframe *uframe;
+	void hd_flush();
 
 	MGETHDR (buf, M_DONTWAIT, MT_HEADER);
 	if (buf == 0)
@@ -338,6 +347,7 @@ struct hdtxq *q;
 	return (m);
 }
 
+void
 hd_append (q, m)
 register struct hdtxq *q;
 register struct mbuf *m;
@@ -351,6 +361,7 @@ register struct mbuf *m;
 	q -> tail = m;
 }
 
+void
 hd_flush (ifp)
 struct ifnet *ifp;
 {
@@ -367,6 +378,7 @@ struct ifnet *ifp;
 	}
 }
 
+void
 hd_message (hdp, msg)
 struct hdcb *hdp;
 char *msg;
@@ -380,6 +392,7 @@ char *msg;
 }
 
 #ifdef HDLCDEBUG
+void
 hd_status (hdp)
 struct hdcb *hdp;
 {
diff --git a/sys/netccitt/hd_timer.c b/sys/netccitt/hd_timer.c
index 8b2ede482c78..925ff6a5e964 100644
--- a/sys/netccitt/hd_timer.c
+++ b/sys/netccitt/hd_timer.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)hd_timer.c	8.1 (Berkeley) 6/10/93
- * $Id$
+ * $Id: hd_timer.c,v 1.2 1994/08/02 07:47:09 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -60,10 +60,6 @@
  * default values are inappropriate
  */
 
-int	hd_t1 = T1;
-int	hd_t3 = T3;
-int	hd_n2 = N2;
-
 /*
  *  HDLC TIMER 
  *
@@ -71,6 +67,7 @@ int	hd_n2 = N2;
  *  amount - if expired then process the event.
  */
 
+void
 hd_timer ()
 {
 	register struct hdcb *hdp;
diff --git a/sys/netccitt/if_x25subr.c b/sys/netccitt/if_x25subr.c
index c75cdd4e0f6d..c7b625ed357f 100644
--- a/sys/netccitt/if_x25subr.c
+++ b/sys/netccitt/if_x25subr.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)if_x25subr.c	8.1 (Berkeley) 6/10/93
- * $Id: if_x25subr.c,v 1.2 1994/08/02 07:47:14 davidg Exp $
+ * $Id: if_x25subr.c,v 1.3 1994/12/13 22:32:12 wollman Exp $
  */
 
 #include <sys/param.h>
@@ -127,6 +127,8 @@ register struct rtentry *rt;
 	}
 	return lx;
 }
+
+void
 x25_lxfree(lx)
 register struct llinfo_x25 *lx;
 {
@@ -145,9 +147,11 @@ register struct llinfo_x25 *lx;
 	remque(lx);
 	FREE(lx, M_PCB);
 }
+
 /*
  * Process a x25 packet as datagram;
  */
+void
 x25_ifinput(lcp, m)
 struct pklcd *lcp;
 register struct mbuf *m;
@@ -157,6 +161,7 @@ register struct mbuf *m;
 	struct ifqueue *inq;
 	extern struct timeval time;
 	int s, len, isr;
+	void x25_connect_callback();
  
 	if (m == 0 || lcp->lcd_state != DATA_TRANSFER) {
 		x25_connect_callback(lcp, 0);
@@ -211,6 +216,8 @@ register struct mbuf *m;
 	}
 	splx(s);
 }
+
+void
 x25_connect_callback(lcp, m)
 register struct pklcd *lcp;
 register struct mbuf *m;
@@ -242,6 +249,7 @@ register struct mbuf *m;
 #define SA(p) ((struct sockaddr *)(p))
 #define RT(p) ((struct rtentry *)(p))
 
+void
 x25_dgram_incoming(lcp, m0)
 register struct pklcd *lcp;
 struct mbuf *m0;
@@ -276,6 +284,7 @@ refuse: 	lcp->lcd_upper = 0;
 /*
  * X.25 output routine.
  */
+int
 x25_ifoutput(ifp, m0, dst, rt)
 struct	ifnet *ifp;
 struct	mbuf *m0;
@@ -390,6 +399,7 @@ next_circuit:
 /*
  * Simpleminded timer routine.
  */
+void
 x25_iftimeout(ifp)
 struct ifnet *ifp;
 {
@@ -413,7 +423,10 @@ struct ifnet *ifp;
  * This routine gets called when validating additions of new routes
  * or deletions of old ones.
  */
+
+void
 x25_rtrequest(cmd, rt, dst)
+int cmd;
 register struct rtentry *rt;
 struct sockaddr *dst;
 {
@@ -424,7 +437,6 @@ struct sockaddr *dst;
 	/* would put this pk_init, except routing table doesn't
 	   exist yet. */
 	if (x25_dgram_sockmask == 0) {
-		struct radix_node *rn_addmask();
 		x25_dgram_sockmask =
 			SA(rn_addmask((caddr_t)&x25_dgmask, 0, 4)->rn_key);
 	}
@@ -464,6 +476,7 @@ struct sockaddr *dst;
 
 int x25_dont_rtinvert = 0;
 
+void
 x25_rtinvert(cmd, sa, rt)
 register struct sockaddr *sa;
 register struct rtentry *rt;