NetBSD 6.1.5 - man page for pcap_setdirection (netbsd section 3)
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pcap_setdirection - set the direction for which packets will be captured
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
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
5 April 2008 PCAP_SETDIRECTION(3)
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