osfmk/ipc/port.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      File:   ipc/ipc_port.h
  54  *      Author: Rich Draves
  55  *      Date:   1989
  56  *
  57  *      Implementation specific complement to mach/port.h.
  58  */
  59
  60 #ifndef _IPC_PORT_H_
  61 #define _IPC_PORT_H_
  62
  63 #include <mach/port.h>
  64
  65 #define MACH_PORT_NGEN(name)            MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
  66
  67 /*
  68  *      Typedefs for code cleanliness.  These must all have
  69  *      the same (unsigned) type as mach_port_name_t.
  70  */
  71
  72 typedef mach_port_name_t mach_port_index_t;             /* index values */
  73 typedef mach_port_name_t mach_port_gen_t;               /* generation numbers */
  74
  75
  76 #define MACH_PORT_UREFS_MAX     ((mach_port_urefs_t) ((1 << 16) - 1))
  77
  78 #define MACH_PORT_UREFS_OVERFLOW(urefs, delta)                          \
  79                 (((delta) > 0) &&                                       \
  80                  ((((urefs) + (delta)) <= (urefs)) ||                   \
  81                   (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
  82
  83 #define MACH_PORT_UREFS_UNDERFLOW(urefs, delta)                         \
  84                 (((delta) < 0) && (-(delta) > (urefs)))
  85
  86 #endif  /* _IPC_PORT_H_ */