--- Net2/sys/ipc.h	2018/04/24 18:10:46	1.1.1.2
+++ Net2/sys/ipc.h	2018/04/24 18:17:02	1.1.1.3
@@ -1 +1,76 @@
-revision 1.1.1.1 intentionally removed
+/*
+ * Copyright (c) 1988 University of Utah.
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * the Systems Programming Group of the University of Utah Computer
+ * Science Department.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	from: @(#)ipc.h	7.2 (Berkeley) 2/5/91
+ *	ipc.h,v 1.3 1993/05/20 16:22:27 cgd Exp
+ */
+
+#ifndef _SYS_IPC_H_
+#define _SYS_IPC_H_
+
+/*
+ * SVID compatible ipc.h file
+ */
+
+typedef	long	key_t;	/* XXX should be in types.h */
+
+struct ipc_perm {
+	ushort	cuid;	/* creator user id */
+	ushort	cgid;	/* creator group id */
+	ushort	uid;	/* user id */
+	ushort	gid;	/* group id */
+	ushort	mode;	/* r/w permission */
+	ushort	seq;	/* sequence # (to generate unique msg/sem/shm id) */
+	key_t	key;	/* user specified msg/sem/shm key */
+};
+
+/* common mode bits */
+#define	IPC_R		00400	/* read permission */
+#define	IPC_W		00200	/* write/alter permission */
+
+/* SVID required constants (same values as system 5) */
+#define	IPC_CREAT	01000	/* create entry if key does not exist */
+#define	IPC_EXCL	02000	/* fail if key exists */
+#define	IPC_NOWAIT	04000	/* error if request must wait */
+
+#define	IPC_PRIVATE	(key_t)0 /* private key */
+
+#define	IPC_RMID	0	/* remove identifier */
+#define	IPC_SET		1	/* set options */
+#define	IPC_STAT	2	/* get options */
+
+#endif /* !_SYS_IPC_H_ */