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Q: 

What happens when the controlling terminal's cable is pulled out?

I am trying to handle a signal(if it exists/is sent) when an application's controlling terminal's network cable is pulled out. I tried with these signals, but I guess they aren't:
SIGHUP SIGINT SIGTERM
I guess in such a case, the server treats the termianl(who's cable was pulled out) just to be in an inactive state. Please suggest.

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