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.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)