FreeBSD/Linux Kernel Cross Reference
sys/net/bpf_compat.h
1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)bpf_compat.h 8.1 (Berkeley) 6/10/93
30 * $FreeBSD: releng/6.4/sys/net/bpf_compat.h 128019 2004-04-07 20:46:16Z imp $
31 */
32
33 #ifndef _NET_BPF_COMPAT_H_
34 #define _NET_BPF_COMPAT_H_
35
36 /*
37 * Some hacks for compatibility across SunOS and 4.4BSD. We emulate malloc
38 * and free with mbuf clusters. We store a pointer to the mbuf in the first
39 * word of the mbuf and return 8 bytes past the start of data (for double
40 * word alignment). We cannot just use offsets because clusters are not at
41 * a fixed offset from the associated mbuf. Sorry for this kludge.
42 */
43 #define malloc(size, type, canwait) \
44 bpf_alloc(size, (canwait & M_NOWAIT) ? M_DONTWAIT : M_TRYWAIT)
45
46 #define free(cp, type) m_free(*(struct mbuf **)(cp - 8))
47
48 /* This mapping works for our purposes. */
49 #define ERESTART EINTR
50
51 #endif
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