@(#) $Header: /tcpdump/master/libpcap/pcap_compile.3pcap.in,v 1.1 2008-10-21 07:33:02 guy Exp $
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.
PCAP_COMPILE 3PCAP "5 April 2008"
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 (@MAN_MISC_INFO@) 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.
netmask 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 PCAP_NETMASK_UNKNOWN can be supplied; tests
for IPv4 broadcast addresses will fail to compile, 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(3PCAP), pcap_setfilter(3PCAP), pcap_freecode(3PCAP),
pcap_geterr(3PCAP), pcap-filter(@MAN_MISC_INFO@)
