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<p class="MsoNormal">Hello Henning,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This is not a race condition.<o:p></o:p></p>
<p class="MsoNormal">The issue I’m observing is the following :<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kamailio receives a signal SIGTERM (15) when it’s being stopped.<o:p></o:p></p>
<p class="MsoNormal">The main process propagates the signal to the children.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The children terminate without closing their opened file handles. Consequently, the files are not flushed to disk.<o:p></o:p></p>
<p class="MsoNormal">This entails we’re losing all data written to these files since the previous automatic flush.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Did anyone try using parameter « flush = 0 » of module db_flatstore ? (the default is 1)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Nicolas.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:FR">De :</span></b><span style="mso-fareast-language:FR"> Henning Westerholt <hw@gilawa.com>
<br>
<b>Envoyé :</b> vendredi 29 octobre 2021 12:00<br>
<b>À :</b> Chaigneau, Nicolas<br>
<b>Cc :</b> Kamailio (SER) - Users Mailing List<br>
<b>Objet :</b> RE: No "child_destroy" export - issue with module flatstore and flush=0<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="DE" style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE">Hi Nicolas,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">the module API could be changed of course, so far it was not needed as the module needs could be covered in the current API version.</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">What kind of errors are you observing, some race conditions or similar?</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Cheers,</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Henning </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><b><span lang="DE" style="mso-fareast-language:DE">From:</span></b><span lang="DE" style="mso-fareast-language:DE"> Chaigneau, Nicolas <<a href="mailto:nicolas.chaigneau@capgemini.com">nicolas.chaigneau@capgemini.com</a>>
<br>
<b>Sent:</b> Wednesday, October 27, 2021 9:28 AM<br>
<b>To:</b> Henning Westerholt <<a href="mailto:hw@gilawa.com">hw@gilawa.com</a>>; Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a>><br>
<b>Subject:</b> RE: No "child_destroy" export - issue with module flatstore and flush=0</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span lang="DE"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">Hello Henning,<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">Thanks for your reply !<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">For the record, I’m using Kamailio module "flatstore" with the flush deactivated. In this situation, when Kamailio is stopped, I’m losing the remaining data in files not yet flushed.<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">So my idea was, when destroy is called, to iterate over the connection pools, and flush/close all the opened files properly.<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">But I found out that it’s not that simple :/<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">Do you think this is something that could be fixed in Kamailio ?<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">Regards,<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">Nicolas.<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"> <span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><b><span style="mso-fareast-language:FR">De :</span></b><span style="mso-fareast-language:FR"> Henning Westerholt <<a href="mailto:hw@gilawa.com">hw@gilawa.com</a>>
<br>
<b>Envoyé :</b> mardi 26 octobre 2021 20:38<br>
<b>À :</b> Kamailio (SER) - Users Mailing List<br>
<b>Cc :</b> Chaigneau, Nicolas<br>
<b>Objet :</b> RE: No "child_destroy" export ?</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span lang="DE" style="color:black"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="DE">Hi Nicolas,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="DE"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">you are right, there is no special function for children destroy. Most modules do not need it, as the data is in shared memory, processes are started over standard kamailio APIs which will be
stopped from the core automatically, to give some background.</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">Some modules do it by just iterating over an internal list of their children and then do the cleanup task. You can find an example in cdp module (destroy, diameter_peer_destroy).</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">Cheers,</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">Henning</span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">-- </span><span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">Henning Westerholt –
</span><span lang="DE"><a href="https://skalatan.de/blog/"><span lang="EN-GB">https://skalatan.de/blog/</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB">Kamailio services –
</span><span lang="DE"><a href="https://gilawa.com/"><span lang="EN-GB">https://gilawa.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"> </span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:70.8pt"><b><span lang="DE" style="mso-fareast-language:DE">From:</span></b><span lang="DE" style="mso-fareast-language:DE"> sr-users <<a href="mailto:sr-users-bounces@lists.kamailio.org">sr-users-bounces@lists.kamailio.org</a>>
<b>On Behalf Of </b>Chaigneau, Nicolas<br>
<b>Sent:</b> Tuesday, October 26, 2021 7:14 PM<br>
<b>To:</b> <a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a><br>
<b>Subject:</b> [SR-Users] No "child_destroy" export ?</span><span lang="DE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:70.8pt"><span lang="DE"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello,<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">I have a module, for which I need to perform some processing in the children processes when Kamailio is being stopped.<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">I’ve looked at the "struct module_export", in which I see "mod_init", "child_init", "mod_destroy"… but no "child_destroy". :/<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">Is there a way to achieve this ?<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">Thanks for your help.<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt"> <span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">Regards,<span lang="DE"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:70.8pt">Nicolas.<span lang="DE"><o:p></o:p></span></p>
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