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+.\" Copyright (c) 1994, 1996, 1997
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that: (1) source code distributions
+.\" retain the above copyright notice and this paragraph in its entirety, (2)
+.\" distributions including binary code include the above copyright notice and
+.\" this paragraph in its entirety in the documentation or other materials
+.\" provided with the distribution, and (3) all advertising materials mentioning
+.\" features or use of this software display the following acknowledgement:
+.\" ``This product includes software developed by the University of California,
+.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+.\" the University nor the names of its contributors may be used to endorse
+.\" or promote products derived from this software without specific prior
+.\" written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.TH PCAP_SETDIRECTION 3PCAP "25 July 2018"
+.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
+.B PCAP_ERROR
+on failure. If
+.B PCAP_ERROR
+is returned,
+.B pcap_geterr(3PCAP)
+or
+.B pcap_perror(3PCAP)
+may be called with
+.I p
+as an argument to fetch or display the error text.
+.SH SEE ALSO
+pcap(3PCAP)