freebsd man page for pcap_offline_filter

PCAP_OFFLINE_FILTER(3)					     Library Functions Manual					    PCAP_OFFLINE_FILTER(3)

NAME
       pcap_offline_filter - check whether a filter matches a packet

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_offline_filter(const struct bpf_program *fp,
	       const struct pcap_pkthdr *h, const u_char *pkt)

DESCRIPTION
       pcap_offline_filter()  checks  whether a filter matches a packet.  fp is a pointer to a bpf_program struct, usually the result of a call to
       pcap_compile().	h points to the pcap_pkthdr structure for the packet, and pkt points to the data in the packet.

RETURN VALUE
       pcap_offline_filter() returns the return value of the filter program.  This will be zero if the packet doesn't match the  filter  and  non-
       zero if the packet matches the filter.

SEE ALSO
       pcap(3), pcap_compile(3)

								 25 November 2012					    PCAP_OFFLINE_FILTER(3)