NAME         top

       pcap_setdirection  - set the direction for which packets will be cap‐

SYNOPSIS         top

       #include <pcap/pcap.h>

       int pcap_setdirection(pcap_t *p, pcap_direction_t d);

DESCRIPTION         top

       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         top

       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         top

       pcap(3PCAP), pcap_geterr(3PCAP)

COLOPHON         top

       This page is part of the libpcap (packet capture library) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, see ⟨⟩.  This page was obtained
       from the project's upstream Git repository
       ⟨⟩ on 2018-02-02.
       (At that time, the date of the most recent commit that was found in
       the repository was 2018-01-31.)  If you discover any rendering prob‐
       lems in this HTML version of the page, or you believe there is a bet‐
       ter or more up-to-date source for the page, or you have corrections
       or improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to

                                8 March 2015        PCAP_SETDIRECTION(3PCAP)