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FIX: Suprocess loops endlessly when the control socket closes.

Simon Ser requested to merge github/fork/tobiasblass/fix_recvmsg_endless_loop into master

Created by: tobiasblass

recvmsg(3) returns 0 if the connection partner has shut down its socket. The communicate function considered 0 a successful message, though, and keeps calling recvmsg(3) again and again.

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