On Sat, Oct 15, 2022 at 01:46:08PM -0700, todd freed wrote:
> All the information I am interested in is available from pmc -u 'GET
> CURRENT_DATA_SET'. But I am not keen to run this operation in a
> separate process.
>
> It seems that pmc is talking to ptp4l roughly by,
>
> socket(AF_UNIX, SOCK_DGRAM, 0) = 3
> bind(3, {sa_family=AF_UNIX, sun_path="/var/run/pmc.789975"}, 110)
> sendto(3, ...)
> recvfrom(3, ...)
>
> All well and good ; is there documentation about the data structures
> sent and received in this manner?
See the management facility in IEEE 1588. That standard defines and
documents the GET CURRENT_DATA_SET request+response messages.
> It would be even simpler if I could make ioctls against the open
> /dev/ptpX fd. It does seem like some such ioctls might exist [1] but I
> can't find documentation for those, either.
No, the device driver implements basic clock operations, like gettime
and settime, and it has nothing at all to do with the PTP.
Thanks,
Richard
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