--- Net2/sys/cdio.h	2018/04/24 18:10:39	1.1
+++ Net2/sys/cdio.h	2018/04/24 18:16:51	1.1.1.2
@@ -1,12 +1,10 @@
 /*
- *
- * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
- * --------------------         -----   ----------------------
- * CURRENT PATCH LEVEL:         1       00098
- * --------------------         -----   ----------------------
- *
- * 16 Feb 93	Julian Elischer		ADDED for SCSI system
+ *	cdio.h,v 1.3 1993/05/20 16:21:53 cgd Exp
  */
+
+#ifndef _SYS_CDIO_H_
+#define _SYS_CDIO_H_
+
 /* Shared between kernel & process */
 
 struct cd_toc_entry {
@@ -145,5 +143,4 @@ struct	ioc_vol
 #define	CDIOCSTOP	_IO('c',23)
 #define	CDIOCEJECT	_IO('c',24)
 
-
-
+#endif /* !_SYS_CDIO_H_ */