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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, PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated, or PCAP_ERROR on other errors. 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)