Hello,
I am looking to implement periodic querying of ptp clock state. I have
the /dev/ptpX device file open, and I am reading timestamps from it
using clock_gettime(phc_fd, ...).
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? (other than the pmc code ... I guess
I will look there next).
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.
Thanks,
-Todd
[1]
https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/ptp/testptp.c#L279
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