pcap_setdirection(3pcap) — Linux manual page
PCAP_SETDIRECTION(3PCAP) PCAP_SETDIRECTION(3PCAP)
NAME
pcap_setdirection - set the direction for which packets will be
captured
SYNOPSIS
#include <pcap/pcap.h>
int pcap_setdirection(pcap_t *p, pcap_direction_t d);
DESCRIPTION
pcap_setdirection() is used to specify a direction that packets
will be captured. d is one of the constants PCAP_D_IN,
PCAP_D_OUT or PCAP_D_INOUT. PCAP_D_IN will only capture packets
received by the device, PCAP_D_OUT will only capture packets sent
by the device and PCAP_D_INOUT will capture packets received by
or sent by the device. PCAP_D_INOUT is the default setting if
this function is not called.
pcap_setdirection() isn't necessarily fully supported on all
platforms; some platforms might return an error for all values,
and some other platforms might not support PCAP_D_OUT.
This operation is not supported if a ``savefile'' is being read.
RETURN VALUE
pcap_setdirection() returns 0 on success,
PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has
been created but not activated, or PCAP_ERROR on other errors. 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.
SEE ALSO
pcap(3PCAP)
COLOPHON
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
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