The recent (?) -G option requires gettimeofday() which isn't available
on Win32. Attached is a patch to util.c which adds this function.
--gv
--- tcpdump-2005.12.03/util.c Thu Jun 16 00:19:38 2005
+++ util.c Sat Dec 03 17:01:05 2005
@@ -526,3 +526,44 @@
else
printf("\\%03o", ch);
}
+
+#ifdef WIN32
+/*
+ * Number of micro-seconds between the beginning of the Windows epoch
+ * (Jan. 1, 1601) and the Unix epoch (Jan. 1, 1970).
+ *
+ * This assumes all Win32 compilers have 64-bit support.
+ */
+#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) || defined(__WATCOMC__)
+ #define DELTA_EPOCH_IN_USEC 11644473600000000Ui64
+#else
+ #define DELTA_EPOCH_IN_USEC 11644473600000000ULL
+#endif
+
+static u_int64_t filetime_to_unix_epoch (const FILETIME *ft)
+{
+ u_int64_t res = (u_int64_t) ft->dwHighDateTime << 32;
+
+ res |= ft->dwLowDateTime;
+ res /= 10; /* from 100 nano-sec periods to usec */
+ res -= DELTA_EPOCH_IN_USEC; /* from Win epoch to Unix epoch */
+ return (res);
+}
+
+int gettimeofday (struct timeval *tv, void *tz _U_)
+{
+ FILETIME ft;
+ u_int64_t tim;
+
+ if (!tv) {
+ errno = EINVAL;
+ return (-1);
+ }
+ GetSystemTimeAsFileTime (&ft);
+ tim = filetime_to_unix_epoch (&ft);
+ tv->tv_sec = (long) (tim / 1000000L);
+ tv->tv_usec = (long) (tim % 1000000L);
+ return (0);
+}
+#endif
-
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