39 lines
693 B
Plaintext
39 lines
693 B
Plaintext
|
#! /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);
|
||
|
|
|