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.TH PCAP_SETDIRECTION 3PCAP "25 July 2018"

.SH NAME

pcap_setdirection \- set the direction for which packets will be captured

.SH SYNOPSIS

.nf

.ft B

#include <pcap/pcap.h>

.ft

.LP

.ft B

int pcap_setdirection(pcap_t *p, pcap_direction_t d);

.ft

.fi

.SH DESCRIPTION

.B pcap_setdirection()

is used to specify a direction that packets will be captured.

.I d

is one of the constants

.BR PCAP_D_IN ,

.B PCAP_D_OUT

or

.BR PCAP_D_INOUT .

.B PCAP_D_IN

will only capture packets received by the device,

.B PCAP_D_OUT

will only capture packets sent by the device and

.B PCAP_D_INOUT

will capture packets received by or sent by the device.

.B PCAP_D_INOUT

is the default setting if this function is not called.

.PP

.B 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

.BR PCAP_D_OUT .

.PP

This operation is not supported if a ``savefile'' is being read.

.SH RETURN VALUE

.B pcap_setdirection()

returns 0 on success and

.B PCAP_ERROR

on failure. If

.B PCAP_ERROR

is returned,

.B pcap_geterr(3PCAP)

or

.B pcap_perror(3PCAP)

may be called with

.I p

as an argument to fetch or display the error text.

.SH SEE ALSO

pcap(3PCAP)