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+.\" Copyright (c) 1994, 1996, 1997
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that: (1) source code distributions
+.\" retain the above copyright notice and this paragraph in its entirety, (2)
+.\" distributions including binary code include the above copyright notice and
+.\" this paragraph in its entirety in the documentation or other materials
+.\" provided with the distribution, and (3) all advertising materials mentioning
+.\" features or use of this software display the following acknowledgement:
+.\" ``This product includes software developed by the University of California,
+.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+.\" the University nor the names of its contributors may be used to endorse
+.\" or promote products derived from this software without specific prior
+.\" written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.TH PCAP_OFFLINE_FILTER 3PCAP "7 April 2014"
+.SH NAME
+pcap_offline_filter \- check whether a filter matches a packet
+.SH SYNOPSIS
+.nf
+.ft B
+#include <pcap/pcap.h>
+.ft
+.LP
+.ft B
+int pcap_offline_filter(const struct bpf_program *fp,
+.ti +8
+const struct pcap_pkthdr *h, const u_char *pkt)
+.ft
+.fi
+.SH DESCRIPTION
+.B pcap_offline_filter()
+checks whether a filter matches a packet.
+.I fp
+is a pointer to a
+.I bpf_program
+struct, usually the result of a call to
+.BR pcap_compile(3PCAP) .
+.I h
+points to the
+.I pcap_pkthdr
+structure for the packet, and
+.I pkt
+points to the data in the packet.
+.SH RETURN VALUE
+.B 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.
+.SH SEE ALSO
+pcap(3PCAP)