Systemd shutdown, halt and reboot handling
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@SGaist It can happen when user login through ssh and cissue
systemctl powerofffor example -
In addition to what @SGaist wrote, there are limitations of what you can and can't do in signal handlers. Not everything is allowed.
@kshegunov it is done not from signal handler, but from slot, connected to qsocketnotifier.
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Depending on what you do, you will get a
SIGTERMand aSIGKILLright after. The later you can't interrupt nor try to do some more stuff. -
Depending on what you do, you will get a
SIGTERMand aSIGKILLright after. The later you can't interrupt nor try to do some more stuff.@SGaist but as i remember systemd documentation stated, that process have 60 seconds until sigkill
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60 second per running process ?
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@SGaist i guessed so. Saw it somewhere in docs.
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Can you find that information again ?
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@SGaist No. Maybe i am mistaken. I found some info here: http://manpages.ubuntu.com/manpages/cosmic/en/man5/systemd.service.5.html
Check section about
TimeoutStopSec=. On my system it is commented out, but here stated, that it is even 90 s. As i understand it is applied per-unit. -
Is your application started as a systemd service ?
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@SGaist Yes, it is started as systemd service. Finally i found the reason, why it hangs. It is happened because I made blocking syscall from event loop. So this thread can be closed and marked as resolved. Appproach with QSocketNotifier and signalfd works.
