[Bug 2641] Add systemd notify code to to track running server

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2641

--- Comment #16 from Damien Miller <djm at mindrot.org> ---
(In reply to Luca Boccassi from comment #14)
> While there, it would be really nice if the RELOADING=1 message also
> included MONOTONIC_USEC=<timestamp> (CLOCK_MONOTONIC in usec as a
> decimal string), which is used for accurate synchronization. IE,
> write a string like "RELOADING=1\nMONOTONIC_USEC=1234...". This will
> enable the unit to be of Type=notify-reload which adds some nice
> features.

That's more tricky as the reload is called from signal handler context
and we can't use snprint() there to format the usec part of the
message. We'd have to refactor how sshd manages SIGHUP restarts.

That would make some other things easier, but it's still a bigger
change.

Anyway, if some of the distro people on this bug can report on whether
the patch is okay, then we can move forward with this and finesse it
later.

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