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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_SETFILTER 3PCAP "25 July 2018"
+.SH NAME
+pcap_setfilter \- set the filter
+.SH SYNOPSIS
+.nf
+.ft B
+#include <pcap/pcap.h>
+.ft
+.LP
+.ft B
+int pcap_setfilter(pcap_t *p, struct bpf_program *fp);
+.ft
+.fi
+.SH DESCRIPTION
+.B pcap_setfilter()
+is used to specify a filter program.
+.I fp
+is a pointer to a
+.I bpf_program
+struct, usually the result of a call to
+.BR \%pcap_compile(3PCAP) .
+.SH RETURN VALUE
+.B pcap_setfilter()
+returns 0 on success and
+.B PCAP_ERROR
+on failure. If
+.B PCAP_ERROR
+is returned,
+.B pcap_geterr(3PCAP)
+or
+.B pcap_perror(3PCAP)
+may be called with
+.I p
+as an argument to fetch or display the error text.
+.SH SEE ALSO
+pcap(3PCAP)