to cross the firewall the email pipe, the child process inherited the parent process file descriptors, because on this case the execvr passes the barrier, whitout they shutting off the process...which is the opposite here, so dont take the forking

Inherit parent socket in fork() child

opposite answer :

http://stackoverflow.com/questions/28341750/inherit-parent-socket-in-fork-child 

 another question is to kill the child process at the right time, before they kill you 

 

How to accurately kill child process after certain time limit in C?

http://stackoverflow.com/questions/30007769/how-to-accurately-kill-child-process-after-certain-time-limit-in-c?rq=1