pcap_compile man page on FreeBSD

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PCAP_COMPILE(3)						       PCAP_COMPILE(3)

NAME
       pcap_compile - compile a filter expression

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_compile(pcap_t *p, struct bpf_program *fp,
	       const char *str, int optimize, bpf_u_int32 netmask);

DESCRIPTION
       pcap_compile() is used to compile the string str into a filter program.
       See pcap-filter(7) for the syntax of that string.  program is a pointer
       to  a  bpf_program struct and is filled in by pcap_compile().  optimize
       controls whether optimization on the resulting code is performed.  net‐
       mask  specifies	the  IPv4  netmask of the network on which packets are
       being captured; it is  used  only  when	checking  for  IPv4  broadcast
       addresses  in  the  filter  program.   If the netmask of the network on
       which packets are being captured isn't known  to	 the  program,	or  if
       packets are being captured on the Linux "any" pseudo-interface that can
       capture on more than one network, a value of 0 can be  supplied;	 tests
       for  IPv4  broadcast  addreses  won't  be done correctly, but all other
       tests in the filter program will be OK.

RETURN VALUE
       pcap_compile() 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_setfilter(3), pcap_freecode(3), pcap_geterr(3), pcap-fil‐
       ter(7)

				 5 April 2008		       PCAP_COMPILE(3)
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