PCAP_SETDIRECTION
Section: Misc. Reference Manual Pages (3PCAP)
Updated: 8 March 2015
Page Index
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 -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
pcap(3PCAP),
pcap_geterr(3PCAP)