[Unit]
Description=Example Socket

[Socket]
ListenStream=12345
Accept=yes

[Install]
WantedBy=sockets.target

##</code><code>##

[Unit]
Description=Example Service

[Service]
ExecStart=/path/to/your/executable
StandardInput=socket

##</code><code>##

systemctl enable example-socket.socket
systemctl start example-socket.socket

##</code><code>##

handle_conenction(\*STDIN);