external/bsd/tcpdump/dist/machdep.c

   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 #include <sys/cdefs.h>
  23 #ifndef lint
  24 __RCSID("$NetBSD: machdep.c,v 1.6 2015/03/31 21:59:35 christos Exp $");
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 /*
  32  * XXX - all we need, on platforms other than DEC OSF/1 (a/k/a Digital UNIX,
  33  * a/k/a Tru64 UNIX), is "size_t", which is a standard C type; what do we
  34  * need to do to get it defined?  This is clearly wrong, as we shouldn't
  35  * have to include UNIX or Windows system header files to get it.
  36  */
  37 #include <tcpdump-stdinc.h>
  38
  39 #ifndef HAVE___ATTRIBUTE__
  40 #define __attribute__(x)
  41 #endif /* HAVE___ATTRIBUTE__ */
  42
  43 #ifdef __osf__
  44 #include <sys/sysinfo.h>
  45 #include <sys/proc.h>
  46
  47 #if !defined(HAVE_SNPRINTF)
  48 int snprintf(char *, size_t, const char *, ...)
  49 #ifdef __ATTRIBUTE___FORMAT_OK
  50      __attribute__((format(printf, 3, 4)))
  51 #endif /* __ATTRIBUTE___FORMAT_OK */
  52      ;
  53 #endif /* !defined(HAVE_SNPRINTF) */
  54 #endif /* __osf__ */
  55
  56 #include "machdep.h"
  57
  58 /*
  59  * On platforms where the CPU doesn't support unaligned loads, force
  60  * unaligned accesses to abort with SIGBUS, rather than being fixed
  61  * up (slowly) by the OS kernel; on those platforms, misaligned accesses
  62  * are bugs, and we want tcpdump to crash so that the bugs are reported.
  63  *
  64  * The only OS on which this is necessary is DEC OSF/1^W^WDigital
  65  * UNIX^W^WTru64 UNIX.
  66  */
  67 int
  68 abort_on_misalignment(char *ebuf _U_, size_t ebufsiz _U_)
  69 {
  70 #ifdef __osf__
  71         static int buf[2] = { SSIN_UACPROC, UAC_SIGBUS };
  72
  73         if (setsysinfo(SSI_NVPAIRS, (caddr_t)buf, 1, 0, 0) < 0) {
  74                 (void)snprintf(ebuf, ebufsiz, "setsysinfo: errno %d", errno);
  75                 return (-1);
  76         }
  77 #endif
  78         return (0);
  79 }