pcap_compile(3PCAP) man page
Updated: 1 December 2009 •
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This man page documents libpcap version 1.6.2 (see also: git master branch, 1.10.4, 1.10.2, 1.10.1, 1.10.0, 1.9.1, 1.8.1, 1.7.4, 1.5.3).
Your system may have a different version installed, possibly with some local modifications. To achieve the best results, please make sure this version of this man page suits your needs. If necessary, try to look for a different version on this web site or in the man pages available in your installation.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.
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
COLOPHON
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