[time-nuts] Leap second glitches on NTP using Z3801A

[Scott Mace]

Here's the diff based on 4.2.4p4

--- ntp-4.2.4p4.orig/ntpd/refclock_hpgps.c      2006-06-06 15:16:51.000000000 -0500
+++ ntp-4.2.4p4/ntpd/refclock_hpgps.c   2008-08-25 09:56:29.000000000 -0500
@@ -535,7 +535,8 @@
                 switch (leapchar) {

                     case '+':
-                       pp->leap = LEAP_ADDSECOND;
+                       if ((month == 6) || (month == 12))
+                           pp->leap = LEAP_ADDSECOND;
                         break;

                     case '0':
@@ -543,7 +544,8 @@
                         break;

                     case '-':
-                       pp->leap = LEAP_DELSECOND;
+                       if ((month == 6) || (month == 12))
+                           pp->leap = LEAP_DELSECOND;
                         break;

                     default:




Scott Mace wrote:
> Yes, I noticed this as well and modified the refclock driver to filter
> it as it does in the oncore refclock.
> 
> 	Scott
> 
> Hal Murray wrote:
>> Is anybody running ntpd with their Z3801A?
>>
>> If so, please check your log files and tell me if you see a bogus leap second 
>> at the end of the past several months.  I've seen them for Aug, Sep, and Oct. 
>>  I think they are coming from my Z3801A, but it might be something else.
>>
>> The GPS satellites are now announcing a leap second that will happen at the 
>> end of the year.   The refclock driver passes that to ntpd and ntpd passes it 
>> to the kernel and magic happens.
>>
>> I think the refclock-ntpd interface assumes the leap second will happen at 
>> the end of the current month.  NIST only announces leap seconds a month ahead 
>> on WWVB and ACTS.
>>
>> The Oncore refclock driver has a filter to wait until the current month to 
>> pass the info to ntpd.  I'm working on something similar for the HP driver.
>>
> 
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