1  /*
 2   * Copyright (c) 2000 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   * Copyright (c) 1992, 1993
30   *	The Regents of the University of California.  All rights reserved.
31   *
32   * Redistribution and use in source and binary forms, with or without
33   * modification, are permitted provided that the following conditions
34   * are met:
35   * 1. Redistributions of source code must retain the above copyright
36   *    notice, this list of conditions and the following disclaimer.
37   * 2. Redistributions in binary form must reproduce the above copyright
38   *    notice, this list of conditions and the following disclaimer in the
39   *    documentation and/or other materials provided with the distribution.
40   * 3. All advertising materials mentioning features or use of this software
41   *    must display the following acknowledgement:
42   *	This product includes software developed by the University of
43   *	California, Berkeley and its contributors.
44   * 4. Neither the name of the University nor the names of its contributors
45   *    may be used to endorse or promote products derived from this software
46   *    without specific prior written permission.
47   *
48   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58   * SUCH DAMAGE.
59   *
60   *	@(#)bpf_compat.h	8.1 (Berkeley) 6/10/93
61   * $FreeBSD: src/sys/net/bpf_compat.h,v 1.6 1999/08/28 00:48:13 peter Exp $
62   */
63  
64  #ifndef _NET_BPF_COMPAT_H_
65  #define _NET_BPF_COMPAT_H_
66  
67  /*
68   * Some hacks for compatibility across SunOS and 4.4BSD.  We emulate malloc
69   * and free with mbuf clusters.  We store a pointer to the mbuf in the first
70   * word of the mbuf and return 8 bytes passed the start of data (for double
71   * word alignment).  We cannot just use offsets because clusters are not at
72   * a fixed offset from the associated mbuf.  Sorry for this kludge.
73   */
74  #define malloc(size, type, canwait) _MALLOC(size, type, canwait)
75  #define free(cp, type) m_free(*(struct mbuf **)(cp - 8))
76  
77  #endif