I found an issue when reading source code 'pcap_interface.c:161-162'. This issue is caused by forgetting to check the return value of libpcap API 'pcap_activate'. According to libpcap document "If pcap_activate() fails, the pcap_t * is not closed and freed; it should be closed using pcap_close()." So it's safer to check it, and use 'pcap_close()' if an error occurs. I submitted an issue on Github:https://github.com/ephracis/pylibpcap/issues/2, and they suggested me to report here. As I can'tsubmit...