[ntp:questions] Start of new GPS 1024 week epoch

David Taylor david-taylor at blueyonder.co.uk.invalid
Wed Aug 28 11:33:42 UTC 2013

On 27/08/2013 20:05, Rob wrote:
> Martin Burnicki <martin.burnicki at meinberg.de> wrote:
>> What I meant is the usage of CreateFileMapping() and MapViewOfFile() for
>> shared memory segments, as it is done in ntpd's refclock_shm.c.
>> We are using this in the Windows driver package for our PCI cards, but
>> this usage is not related to NTP. AFAIK this is supported in all Windows
>> version at least starting with NT.
>> Ntpd has already implemented this (which I also didn't know until
>> recently), and it should not be too hard for something like gpsd to
>> implement this also, if this han't already been done, yet.
> Looking in the most recent ntpshm.c I see only the calls to shmget
> and shmat.  But I think you are right, it should be quite simple to
> add a compilation conditional and replace it with mapping calls similar
> to what is found in the Windows port of ntpd.
> However, it could also be that libraries that come with cygwin already
> do that translation.


There should be no requirement to install Cygwin for NTP users on 
Windows, if that's what you are suggesting.
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