1/*
2 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * @OSF_COPYRIGHT@
30 */
31/*
32 * Mach Operating System
33 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
34 * All Rights Reserved.
35 *
36 * Permission to use, copy, modify and distribute this software and its
37 * documentation is hereby granted, provided that both the copyright
38 * notice and this permission notice appear in all copies of the
39 * software, derivative works or modified versions, and any portions
40 * thereof, and that both notices appear in supporting documentation.
41 *
42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
43 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
45 *
46 * Carnegie Mellon requests users of this software to return to
47 *
48 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
49 *  School of Computer Science
50 *  Carnegie Mellon University
51 *  Pittsburgh PA 15213-3890
52 *
53 * any improvements or extensions that they make and grant Carnegie Mellon
54 * the rights to redistribute these changes.
55 */
56/*
57 */
58/*
59 *	File:	ipc/ipc_port.h
60 *	Author:	Rich Draves
61 *	Date:	1989
62 *
63 *	Implementation specific complement to mach/port.h.
64 */
65
66#ifndef	_IPC_PORT_H_
67#define _IPC_PORT_H_
68
69#include <mach/port.h>
70
71#define	MACH_PORT_NGEN(name)		MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
72
73/*
74 *	Typedefs for code cleanliness.  These must all have
75 *	the same (unsigned) type as mach_port_name_t.
76 */
77
78
79#define	MACH_PORT_UREFS_MAX	((mach_port_urefs_t) ((1 << 16) - 1))
80
81#define	MACH_PORT_UREFS_OVERFLOW(urefs, delta)				\
82		(((delta) > 0) &&					\
83		 ((((urefs) + (delta)) <= (urefs)) ||			\
84		  (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
85
86#define	MACH_PORT_UREFS_UNDERFLOW(urefs, delta)				\
87		(((delta) < 0) && (((mach_port_urefs_t)-(delta)) > (urefs)))
88
89#endif	/* _IPC_PORT_H_ */
90