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that's not really an answer to your question but...<br>
<br>
have you looked at systemd-socket-proxyd ? it's a simple program
that is meant to be started by a socket and will redirect all
traffic to another local port.<br>
<br>
Properly used it allows a traditional network daemon to be started
on demand. I won't go in the details, it's pretty well explained in
the man page.<br>
<br>
Depending on why you are converting your software, it could be
something interesting to look at...<br>
<br>
<div class="moz-cite-prefix">On 23/01/2018 08:18, Mantas Mikulėnas
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPWNY8XkFovgE-d4woWB+Bw6gADnb8AxmJq25s+t2qLUZNyY0g@mail.gmail.com">
<pre wrap="">On Tue, Jan 23, 2018 at 3:06 AM, Liam Kelly <a class="moz-txt-link-rfc2396E" href="mailto:liamkelly17@gmail.com"><liamkelly17@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">How does Systemd communicate to socket activated application that the
connection has been closed? How can I modify my application to detect this
event if it cannot be configured to be closed automatically?
We are trying to add network support to legacy code using Systemd sockets.
Using the 0pointer tutorials, we were able to configure a listening TCP
port and launch an instance of the application when a TCP connection came
in. The problem is that when the connection is closed, the service is still
running.
The systemct list-units and netstat -tuapn outputs are what you would
expect when the connection is established
systemctl list-units:
<a class="moz-txt-link-abbreviated" href="mailto:myapp@5-192.168.0.75:10001-192.168.210.102:19983.service">myapp@5-192.168.0.75:10001-192.168.210.102:19983.service</a> loaded
active running My App
netstat -tuapn:
tcp 0 0 192.168.0.75:10001 192.168.210.102:19983
ESTABLISHED 1/init
However, once the client closes the connection, the socket is closed and
removed, but the application is still running as a service:
</pre>
</blockquote>
<pre wrap="">
It is no different from any other type of networked service. Whether you
opened the socket yourself, or received it from a superserver, makes no
difference.
For example, if your program uses poll(), the kernel reports POLLHUP on a
closed socket. If the program uses read() or recv(), 0 bytes indicates that
the socket is closed. If the program uses simple stdio (inetd style), it's
enough to check for EOF on reads from stdin.
</pre>
<br>
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<pre wrap="">_______________________________________________
systemd-devel mailing list
<a class="moz-txt-link-abbreviated" href="mailto:systemd-devel@lists.freedesktop.org">systemd-devel@lists.freedesktop.org</a>
<a class="moz-txt-link-freetext" href="https://lists.freedesktop.org/mailman/listinfo/systemd-devel">https://lists.freedesktop.org/mailman/listinfo/systemd-devel</a>
</pre>
</blockquote>
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