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pcap_set_datalink - set the link-layer header type to be used by a capture device

#include <pcap/pcap.h>

int pcap_set_datalink(pcap_t *p, int dlt);

pcap_set_datalink() is used to set the current link-layer header type of the pcap descriptor to the type specified by dlt . pcap_set_datalink() returns 0 on success and PCAP_ERROR on failure. If PCAP_ERROR is returned, pcap_geterr(3PCAP) or pcap_perror(3PCAP) may be called with p as an argument to fetch or display the error text. pcap(3PCAP), pcap_datalink_name_to_val(3PCAP)