ipc.h revision 2729 
1/*
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1990, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 * (c) UNIX System Laboratories, Inc.
6 * All or some portions of this file are derived from material licensed
7 * to the University of California by American Telephone and Telegraph
8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
10 *
11 * This code is derived from software contributed to Berkeley by
12 * the Systems Programming Group of the University of Utah Computer
13 * Science Department.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 *    notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 *    notice, this list of conditions and the following disclaimer in the
22 *    documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 *    must display the following acknowledgement:
25 *	This product includes software developed by the University of
26 *	California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 *    may be used to endorse or promote products derived from this software
29 *    without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 *	@(#)ipc.h	8.3 (Berkeley) 1/21/94
44 * $Id: ipc.h,v 1.2 1994/08/02 07:53:06 davidg Exp $
45 */
46
47/*
48 * SVID compatible ipc.h file
49 */
50#ifndef _SYS_IPC_H_
51#define _SYS_IPC_H_
52
53typedef	long	key_t;	/* XXX should be in types.h */
54
55struct ipc_perm {
56	ushort	cuid;	/* creator user id */
57	ushort	cgid;	/* creator group id */
58	ushort	uid;	/* user id */
59	ushort	gid;	/* group id */
60	ushort	mode;	/* r/w permission */
61	ushort	seq;	/* sequence # (to generate unique msg/sem/shm id) */
62	key_t	key;	/* user specified msg/sem/shm key */
63};
64
65/* common mode bits */
66#define	IPC_R		00400	/* read permission */
67#define	IPC_W		00200	/* write/alter permission */
68#define	IPC_M		10000	/* permission to change control info */
69
70/* SVID required constants (same values as system 5) */
71#define	IPC_CREAT	01000	/* create entry if key does not exist */
72#define	IPC_EXCL	02000	/* fail if key exists */
73#define	IPC_NOWAIT	04000	/* error if request must wait */
74
75#define	IPC_PRIVATE	(key_t)0 /* private key */
76
77#define	IPC_RMID	0	/* remove identifier */
78#define	IPC_SET		1	/* set options */
79#define	IPC_STAT	2	/* get options */
80
81#ifdef KERNEL
82/* Macros to convert between ipc ids and array indices or sequence ids */
83#define	IPCID_TO_IX(id)		((id) & 0xffff)
84#define	IPCID_TO_SEQ(id)	(((id) >> 16) & 0xffff)
85#define	IXSEQ_TO_IPCID(ix,perm)	(((perm.seq) << 16) | (ix & 0xffff))
86#endif /* KERNEL */
87
88#endif /* !_SYS_IPC_H_ */
89