[fpc-pascal] Can a console app running as Linux service restart itself?

[Travis Siegel]

If you didn't have the configuration setup as required, you could still 
spawn a second process to kill and restart your process as well, this 
works too, but Michael's suggestion is probably much cleaner, and in all 
likelihood, is probably the preferred method, but I know folks struggle 
with the whole system process configuration issue, so some go the other 
route just for simplicity sake.


On 5/20/2021 12:03 PM, Bo Berglund via fpc-pascal wrote:
> On Thu, 20 May 2021 17:13:16 +0200 (CEST), Michael Van Canneyt via fpc-pascal
> <fpc-pascal at lists.freepascal.org> wrote:
>
>>
>> On Thu, 20 May 2021, Bo Berglund via fpc-pascal wrote:
>>
>>> On Thu, 20 May 2021 14:52:47 +0200 (CEST), Michael Van Canneyt via fpc-pascal
>>> <fpc-pascal at lists.freepascal.org> wrote:
>>>
>>>>
>>>> On Thu, 20 May 2021, Bo Berglund via fpc-pascal wrote:
>>>>
>>>>> I would like my service application to restart itself once per 24 hours, but
>>>>> only when nothing else is going on. So the application itself would know this
>>>>> but how can I make it restart itself (as the service)?
>>>> Just exit ?
>>>> If you configured systemd to start your app correctly it will restart it.
>>>>
>>> Is it as simple as that? Here is my service file:
>>>
>>> [Unit]
>>> Description=SSRemote Server
>>> Wants=network.target
>>> After=syslog.target network-online.target
>>>
>>> [Service]
>>> Type=simple
>>> ExecStart=/agi/ssremote/bin/SSRemoteServerLx
>>> Restart=always  #<== This
>>> RestartSec=10   #<== And this
>>> KillMode=process
>>> User=pi
>>>
>>> [Install]
>>> WantedBy=multi-user.target
>>>
>>> Do these 2 marked lines mean that if the service application just exits (with no
>>> exit code) systemd will restart it after 10 seconds?
>> Yes.
>>
>>> And:
>>> Right now I am running it as user pi as shown above, is there some reason I
>>> should run it as root instead?
>> Running as root is not recommended. You can do it, but I would not.
>>
> Thanks Michael, much obliged!
> Makes things so much simpler. Just exit at the appropriate time. :-)
>