Computer Science Both systemd and ncat allow you to create TCP servers from code originally designed to communicate with a terminal. Both are written in C. Referring to either the command line...

Both systemd and ncat allow you to create TCP servers from code originally designed to communicate with a terminal. Both are written in C. Referring to either the command line arguments used by ncat or the declarations and directives contained in systemd unit files, what information is being picked up and which C function calls are being used to implement these packages?