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) 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 } 75