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PCAP_SETDIRECTION(3)       Library Functions Manual       PCAP_SETDIRECTION(3)

       pcap_setdirection - set the direction for which packets will be

       #include <pcap/pcap.h>

       int pcap_setdirection(pcap_t *p, pcap_direction_t d);

       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.

       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.

       pcap(3), pcap_geterr(3)

                                 8 March 2015             PCAP_SETDIRECTION(3)