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   20 .TH PCAP_SETFILTER 3PCAP "25 July 2018"
   21 .SH NAME
   22 pcap_setfilter \- set the filter
   23 .SH SYNOPSIS
   24 .nf
   25 .ft B
   26 #include <pcap/pcap.h>
   27 .ft
   28 .LP
   29 .ft B
   30 int pcap_setfilter(pcap_t *p, struct bpf_program *fp);
   31 .ft
   32 .fi
   33 .SH DESCRIPTION
   34 .B pcap_setfilter()
   35 is used to specify a filter program.
   36 .I fp
   37 is a pointer to a
   38 .I bpf_program
   39 struct, usually the result of a call to
   40 .BR \%pcap_compile(3PCAP) .
   41 .SH RETURN VALUE
   42 .B pcap_setfilter()
   43 returns 0 on success and
   44 .B PCAP_ERROR
   45 on failure. If
   46 .B PCAP_ERROR
   47 is returned,
   48 .B pcap_geterr(3PCAP)
   49 or
   50 .B pcap_perror(3PCAP)
   51 may be called with
   52 .I p
   53 as an argument to fetch or display the error text.
   54 .SH SEE ALSO
   55 pcap(3PCAP)