[systemd-devel] Stopping services started by Systemd socket

[Jérémy Rosen]

that's not really an answer to your question but...

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.

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.

Depending on why you are converting your software, it could be something 
interesting to look at...

On 23/01/2018 08:18, Mantas Mikulėnas wrote:
> On Tue, Jan 23, 2018 at 3:06 AM, Liam Kelly <liamkelly17 at gmail.com> wrote:
>
>> 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:
>>
>>      myapp at 5-192.168.0.75:10001-192.168.210.102:19983.service 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:
>>
> 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.
>
>
>
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