pcap_setdirection(3pcap) — Linux manual page



NAME         top

       pcap_setdirection - set the direction for which packets will be

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,
       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

SEE ALSO         top


COLOPHON         top

       This page is part of the libpcap (packet capture library)
       project.  Information about the project can be found at 
       ⟨http://www.tcpdump.org/⟩.  If you have a bug report for this
       manual page, see ⟨http://www.tcpdump.org/#patches⟩.  This page
       was obtained from the project's upstream Git repository
       ⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2024-06-14.
       (At that time, the date of the most recent commit that was found
       in the repository was 2024-06-04.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better 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

                              5 March 2022      PCAP_SETDIRECTION(3PCAP)