1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/ntp/scripts/calc_tickadj b/contrib/ntp/scripts/calc_tickadj
new file mode 100644
index 0000000..f7a9f9f
--- /dev/null
+++ b/contrib/ntp/scripts/calc_tickadj
@@ -0,0 +1,38 @@
+#! /usr/local/bin/perl
+#
+# drift of 104.8576 -> +1 tick.  Base  of 10000 ticks.
+#
+# 970306 HMS Deal with nanoseconds.  Fix sign of adjustments.
+
+$df="/etc/ntp.drift";
+# Assumes a 100Hz box with "tick" of 10000
+# Someday, we might call "tickadj" for better values...
+$base=10000;	# tick: 1,000,000 / HZ
+$cvt=104.8576;	# 2 ** 20 / $base
+$v1=0.;
+$v2="";
+
+if (open(DF, $df))
+  {
+    if ($_=<DF>)
+      {
+        ($v1, $v2) = split;
+      }
+
+    while ($v1 < 0)
+      {
+        $v1 += $cvt;
+        $base--;
+      }
+
+    while ($v1 > $cvt)
+      {
+        $v1 -= $cvt;
+        $base++;
+      }
+  }
+
+printf("%.3f (drift)\n", $v1);
+
+printf("%d usec; %d nsec\n", $base, ($base + ($v1/$cvt)) * 1000);
+