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1 office 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 <tcpdump-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)
43 int 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 */
62 int
63 abort_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 }