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pcap_setfilter - set the filter

#include <pcap/pcap.h>

int pcap_setfilter(pcap_t *p, struct bpf_program *fp);

pcap_setfilter () is used to specify a filter program. fp is a pointer to a bpf_program struct, usually the result of a call to \%pcap_compile (3PCAP). pcap_setfilter () 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)