[Listener] Use perror() after recvfrom()
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@ -1261,7 +1261,7 @@ void* autocalibrate(void *NULL_value)
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if (nread <= 0 && owl_run)
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{
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if (owl_run)
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fprintf(stderr, "No message received from aggregator!\n") ;
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perror("No message received from aggregator") ;
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continue ;
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}
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