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)