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)

                                           5 March 2022                  PCAP_SETDIRECTION(3PCAP)