1/*
2 * Copyright (c) 1996, 1997
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: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22#ifdef HAVE_CONFIG_H
23#include "config.h"
24#endif
25
26/*
27 * XXX - all we need, on platforms other than DEC OSF/1 (a/k/a Digital UNIX,
28 * a/k/a Tru64 UNIX), is "size_t", which is a standard C type; what do we
29 * need to do to get it defined?  This is clearly wrong, as we shouldn't
30 * have to include UNIX or Windows system header files to get it.
31 */
32#include <netdissect-stdinc.h>
33
34#ifndef HAVE___ATTRIBUTE__
35#define __attribute__(x)
36#endif /* HAVE___ATTRIBUTE__ */
37
38#ifdef __osf__
39#include <sys/sysinfo.h>
40#include <sys/proc.h>
41
42#if !defined(HAVE_SNPRINTF)
43int snprintf(char *, size_t, const char *, ...)
44#ifdef __ATTRIBUTE___FORMAT_OK
45     __attribute__((format(printf, 3, 4)))
46#endif /* __ATTRIBUTE___FORMAT_OK */
47     ;
48#endif /* !defined(HAVE_SNPRINTF) */
49#endif /* __osf__ */
50
51#include "machdep.h"
52
53/*
54 * On platforms where the CPU doesn't support unaligned loads, force
55 * unaligned accesses to abort with SIGBUS, rather than being fixed
56 * up (slowly) by the OS kernel; on those platforms, misaligned accesses
57 * are bugs, and we want tcpdump to crash so that the bugs are reported.
58 *
59 * The only OS on which this is necessary is DEC OSF/1^W^WDigital
60 * UNIX^W^WTru64 UNIX.
61 */
62int
63abort_on_misalignment(char *ebuf _U_, size_t ebufsiz _U_)
64{
65#ifdef __osf__
66	static int buf[2] = { SSIN_UACPROC, UAC_SIGBUS };
67
68	if (setsysinfo(SSI_NVPAIRS, (caddr_t)buf, 1, 0, 0) < 0) {
69		(void)snprintf(ebuf, ebufsiz, "setsysinfo: errno %d", errno);
70		return (-1);
71	}
72#endif
73	return (0);
74}
75