2009-03-21 20:43:56 +00:00
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.\" @(#) $Header: /tcpdump/master/libpcap/pcap_compile.3pcap.in,v 1.1.2.2 2008-10-21 07:44:57 guy Exp $
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.\"
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.\" Copyright (c) 1994, 1996, 1997
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.\"
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_COMPILE 3PCAP "5 April 2008"
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.SH NAME
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pcap_compile \- compile a filter expression
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.ft
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.LP
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.ft B
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int pcap_compile(pcap_t *p, struct bpf_program *fp,
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.ti +8
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const char *str, int optimize, bpf_u_int32 netmask);
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.ft
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.fi
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.SH DESCRIPTION
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.B pcap_compile()
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is used to compile the string
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.I str
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into a filter program. See
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2009-03-21 22:58:08 +00:00
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.BR pcap-filter (7)
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2009-03-21 20:43:56 +00:00
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for the syntax of that string.
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.I program
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is a pointer to a
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.I bpf_program
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struct and is filled in by
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.BR pcap_compile() .
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.I optimize
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controls whether optimization on the resulting code is performed.
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.I netmask
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specifies the IPv4 netmask of the network on which packets are being
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captured; it is used only when checking for IPv4 broadcast addresses in
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the filter program. If the netmask of the network on which packets are
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being captured isn't known to the program, or if packets are being
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captured on the Linux "any" pseudo-interface that can capture on more
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than one network, a value of 0 can be supplied; tests for IPv4 broadcast
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addreses won't be done correctly, but all other tests in the filter
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program will be OK.
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.SH RETURN VALUE
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.B pcap_compile()
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returns 0 on success and \-1 on failure.
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If \-1 is returned,
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.B pcap_geterr()
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or
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.B pcap_perror()
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may be called with
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.I p
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as an argument to fetch or display the error text.
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.SH SEE ALSO
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pcap(3PCAP), pcap_setfilter(3PCAP), pcap_freecode(3PCAP),
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2009-03-21 22:58:08 +00:00
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pcap_geterr(3PCAP), pcap-filter(7)
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