--- Net2/sys/fifo.h	2018/04/24 18:03:58	1.1
+++ Net2/sys/fifo.h	2018/04/24 18:16:36	1.1.1.2
@@ -30,9 +30,13 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)fifo.h	7.1 (Berkeley) 4/15/91
+ *	from: @(#)fifo.h	7.1 (Berkeley) 4/15/91
+ *	fifo.h,v 1.4 1993/06/27 05:59:02 andrew Exp
  */
 
+#ifndef _SYS_FIFO_H_
+#define _SYS_FIFO_H_
+
 #ifdef FIFO
 /*
  * Prototypes for fifo operations on vnodes.
@@ -167,7 +171,9 @@ int	fifo_bmap __P((
 		daddr_t *bnp));
 #define fifo_strategy ((int (*) __P(( \
 		struct buf *bp))) fifo_badop)
-int	fifo_print __P((
+void	fifo_print __P((
+		struct vnode *vp));
+void	fifo_printinfo __P((
 		struct vnode *vp));
 #define fifo_islocked ((int (*) __P(( \
 		struct vnode *vp))) nullop)
@@ -178,3 +184,5 @@ int	fifo_advlock __P((
 		struct flock *fl,
 		int flags));
 #endif /* FIFO */
+
+#endif /* !_SYS_FIFO_H_ */