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- .TH PCAP_SETDIRECTION 3PCAP "8 March 2015"
- .SH NAME
- pcap_setdirection \- set the direction for which packets will be captured
- .SH SYNOPSIS
- .nf
- .ft B
- #include <pcap/pcap.h>
- .ft
- .LP
- .ft B
- int pcap_setdirection(pcap_t *p, pcap_direction_t d);
- .ft
- .fi
- .SH DESCRIPTION
- .B pcap_setdirection()
- is used to specify a direction that packets will be captured.
- .I d
- is one of the constants
- .BR PCAP_D_IN ,
- .B PCAP_D_OUT
- or
- .BR PCAP_D_INOUT .
- .B PCAP_D_IN
- will only capture packets received by the device,
- .B PCAP_D_OUT
- will only capture packets sent by the device and
- .B PCAP_D_INOUT
- will capture packets received by or sent by the device.
- .B PCAP_D_INOUT
- is the default setting if this function is not called.
- .PP
- .B 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
- .BR PCAP_D_OUT .
- .PP
- This operation is not supported if a ``savefile'' is being read.
- .SH RETURN VALUE
- .B pcap_setdirection()
- returns 0 on success and \-1 on failure.
- If \-1 is returned,
- .B pcap_geterr()
- or
- .B pcap_perror()
- may be called with
- .I p
- as an argument to fetch or display the error text.
- .SH SEE ALSO
- pcap(3PCAP), pcap_geterr(3PCAP)
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