Man pages matching name pcap_datalink_name_to_val in section 3pcap:

pcap_datalink_name_to_val.3pcap.en	debian 10 / libpcap0.8-dev
pcap_datalink_name_to_val.3pcap.en	debian 11 / libpcap0.8-dev
pcap_datalink_name_to_val.3pcap.en	debian 12 / libpcap0.8-dev