pcap_setdirection(3PCAP) man page

Updated: 25 July 2018 • View in plain text • Return to Main Contents

This man page documents libpcap version 1.10.0 (see also: git master branch, 1.10.4, 1.10.2, 1.10.1, 1.9.1, 1.8.1, 1.7.4, 1.6.2, 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_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 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.

COLOPHON

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