1 files changed, 58 insertions, 0 deletions
diff --git a/machdep.c b/machdep.c
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+++ b/machdep.c
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+/*
+ * Copyright (c) 1996, 1997
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stddef.h>
+
+#ifdef __osf__
+#include <stdio.h>
+#include <sys/sysinfo.h>
+#include <sys/proc.h>
+#endif /* __osf__ */
+
+#include "varattrs.h"
+#include "machdep.h"
+
+/*
+ * On platforms where the CPU doesn't support unaligned loads, force
+ * unaligned accesses to abort with SIGBUS, rather than being fixed
+ * up (slowly) by the OS kernel; on those platforms, misaligned accesses
+ * are bugs, and we want tcpdump to crash so that the bugs are reported.
+ *
+ * The only OS on which this is necessary is DEC OSF/1^W^WDigital
+ * UNIX^W^WTru64 UNIX.
+ */
+int
+abort_on_misalignment(char *ebuf _U_, size_t ebufsiz _U_)
+{
+#ifdef __osf__
+	static int buf[2] = { SSIN_UACPROC, UAC_SIGBUS };
+
+	if (setsysinfo(SSI_NVPAIRS, (caddr_t)buf, 1, 0, 0) < 0) {
+		(void)snprintf(ebuf, ebufsiz, "setsysinfo: errno %d", errno);
+		return (-1);
+	}
+#endif
+	return (0);
+}