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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | BACKWARD COMPATIBILITY | SEE ALSO | COLOPHON |
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PCAP_COMPILE(3PCAP) PCAP_COMPILE(3PCAP)
pcap_compile - compile a filter expression
#include <pcap/pcap.h>
int pcap_compile(pcap_t *p, struct bpf_program *fp,
const char *str, int optimize, bpf_u_int32 netmask);
pcap_compile() is used to compile the string str into a filter
program. See pcap-filter(7) for the syntax of that string. fp
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.
NOTE: in libpcap 1.8.0 and later, pcap_compile() can be used in
multiple threads within a single process. However, in earlier
versions of libpcap, it is not safe to use pcap_compile() in
multiple threads in a single process without some form of mutual
exclusion allowing only one thread to call it at any given time.
pcap_compile() returns 0 on success and PCAP_ERROR on failure. If
PCAP_ERROR is returned, pcap_geterr(3PCAP) or pcap_perror(3PCAP)
may be called with p as an argument to fetch or display the error
text.
The PCAP_NETMASK_UNKNOWN constant became available in libpcap
release 1.1.0.
pcap(3PCAP), pcap_setfilter(3PCAP), pcap_freecode(3PCAP)
This page is part of the libpcap (packet capture library)
project. Information about the project can be found at
⟨http://www.tcpdump.org/⟩. If you have a bug report for this
manual page, see ⟨http://www.tcpdump.org/#patches⟩. This page
was obtained from the project's upstream Git repository
⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
22 August 2018 PCAP_COMPILE(3PCAP)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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