pcap_datalink_val_to_name, pcap_datalink_val_to_description,
pcap_datalink_val_to_description_or_dlt - get a name or description for a
link-layer header type value
pcap_open_offline, pcap_open_offline_with_tstamp_precision,
pcap_fopen_offline, pcap_fopen_offline_with_tstamp_precision - open a saved
capture file for reading