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<p>As I understand, the application has to periodically send the
notification to systemd service manager. I am not sure if this
will help with kamailio multiprocesses, when each of them can
hung, not only the main process.</p>
<p>Anyhow, there is systemdops module that tries to collect the
features related to systemd.</p>
<p>The best would be if there is a shutdown time limit that systemd
can watch and if not, do kill -9.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 26.06.21 19:08, Sergey Safarov
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAHtxdDfVn8Ofn3y-9-4kfzmAkzTeafjwfP9D8hx2_akofTm=Xw@mail.gmail.com">
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<div dir="ltr">I have observed a case when Kamaili debug module
try to grab the lock on shutdown and not able to do it.
<div>As a result, the Kamailio process is stuck and not able to
restart (dead lock).</div>
<div><br>
</div>
<div>To resolve such a case i want to utilize systemd watchdog
feature</div>
<div><a
href="https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#"
moz-do-not-send="true">https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#</a><br>
</div>
<div><br>
</div>
<div>To use this feature I need send sd_notify(3) with a
message string of "WATCHDOG=1" from main process</div>
<div><a
href="https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#"
moz-do-not-send="true">https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#</a><br>
</div>
<div><br>
</div>
<div>According to systemd doc only one process to send watchdog</div>
<div>If the $WATCHDOG_USEC environment variable is set, and the
$WATCHDOG_PID variable is unset or set to the PID of the
current process, the service manager expects notifications
from this process.<br>
</div>
<div>
<div><a
href="https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#"
moz-do-not-send="true">https://www.freedesktop.org/software/systemd/man/sd_watchdog_enabled.html#</a><br>
</div>
<div> </div>
</div>
<div>Additional info at</div>
<div><a
href="https://lists.freedesktop.org/archives/systemd-devel/2018-January/040185.html"
moz-do-not-send="true">https://lists.freedesktop.org/archives/systemd-devel/2018-January/040185.html</a></div>
<div><br>
</div>
<div>Could you suggest how to embed this systemd call to the
main process?<br>
<br>
</div>
<div>Sergey</div>
<div><br>
</div>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
Kamailio (SER) - Development Mailing List
<a class="moz-txt-link-abbreviated" href="mailto:sr-dev@lists.kamailio.org">sr-dev@lists.kamailio.org</a>
<a class="moz-txt-link-freetext" href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a></pre>
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