On 21/06/2017 13:49, roman.mescherya...@gmail.com wrote:
вторник, 20 июня 2017 г., 19:38:53 UTC+3 пользователь David Woolley написал:
I think you are expected to use the relevant management request
directly, rather than parse output intended for humans. That would
avoid process startup, filtering, and DNS costs.
What does it mean to “use the relevant management request directly”? I’m new to
NTP and Linux and this phrase is not clear to me. If it makes any difference,
my program is written on Python and running under Raspbian OS.
ntpq works by sending special "management" request UDP packets to the
queried server and then parsing the resulting "management" reply UDP
packets. The default is to query the server on 127.0.0.1 (or ::1 for
IPv6).
Some (most?, all?) of these "management" packets are documented in the
NTPv4 protocol RFC. Their relationships with ntpq command line options
can be found (if nowhere else) in the ntpq source code.
Converting that source code from C to Python is left as an educational
exercise for fans that BBC children's program ;-)
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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WiseMo - Remote Service Management for PCs, Phones and Embedded
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