How to kill a process and all of its descendants in Nim?

[mrhdias]

Thanks @shirleyquirk for your help, but my problem persists, or I haven't 
explained myself well. What I want is to write the command "kill" in the 
terminal to kill the process and all of its descendants.

How to catch the signal sent by "kill" in Nim?

Example: 
    
    
    # launch n processes
    $ ./server
    # how to kill parent and child's at once?
    $ kill -9 pid
    
    
    Run