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 PCAP_ERROR on
failure. 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.
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 2021-08-27.
(At that time, the date of the most recent commit that was found
in the repository was 2021-08-17.) 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
25 July 2018 PCAP_SETDIRECTION(3PCAP)