<p></p>
<p dir="auto">This is not related to C source code.<br>
This is related to the file system used by OS.<br>
<a href="https://en.wikipedia.org/wiki/OSTree" rel="nofollow">https://en.wikipedia.org/wiki/OSTree</a></p>
<p dir="auto">I think, more prefer to use <code class="notranslate">CFGFILE</code> variable in the <code class="notranslate">/etc/sysconfig/kamailio</code> to define a custom config file, like</p>
<pre class="notranslate"><code class="notranslate">[root@ip-100-85-120-8 ~]# head /etc/sysconfig/kamailio 
CFGFILE=/etc/sbc/kamailio.cfg

#
# Kamailio startup options
#

# Amount of shared memory to allocate for the running Kamailio server (in Mb)
SHM_MEMORY=128

# Amount of per-process (package) memory to allocate for Kamailio (in Mb)
</code></pre>
<p dir="auto">And when I "upgrade" or "install" packages then it will not conflict with files (symbolic links) manually placed on the file system.</p>

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