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 -1 on failure. If -1 is
returned, pcap_geterr() or pcap_perror() may be called with
p as an argument to fetch or display the error text.
pcap(3), pcap_geterr(3), pcap_datalink_name_to_val(3)