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

[bugzilla-daemon at bugzilla.mindrot.org]

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

--- Comment #7 from Darren Tucker <dtucker at zip.com.au> ---
(In reply to Jakub Jelen from comment #6)
> Created attachment 2950 [details]
> fixed patch
> 
> Never mind. Nothing from above resolves the race condition between
> systemd reading PID file and sshd after reexec writing it, except
> adding SD_NOTIFY code so I gave up.

What about reading the pidfile first to see if it has the correct PID
before rewriting it?  I did something like that to work around a
problem in pam_loginuid (LinuxPAM ticket #23, I'd link to it but
fedorahosted.org seems to have imploded).

Does systemd even need a pidfile?

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