pcap_setfilter man page on PC-BSD

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PCAP_SETFILTER(3)					     PCAP_SETFILTER(3)

NAME
       pcap_setfilter - set the filter

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_setfilter(pcap_t *p, struct bpf_program *fp);

DESCRIPTION
       pcap_setfilter()	 is used to specify a filter program.  fp is a pointer
       to a bpf_program struct, usually the result  of	a  call	 to  pcap_com‐
       pile().

RETURN VALUE
       pcap_setfilter()	 returns  0  on	 success  and -1 on failure.  If -1 is
       returned, pcap_geterr() or pcap_perror() may be called  with  p	as  an
       argument to fetch or display the error text.

SEE ALSO
       pcap(3), pcap_compile(3), pcap_geterr(3)

				 5 April 2008		     PCAP_SETFILTER(3)
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