freebsd-src/contrib/libpcap/pcap_setdirection.3pcap
Joseph Mingrone 6f9cba8f8b
libpcap: Update to 1.10.3
Local changes:

- In contrib/libpcap/pcap/bpf.h, do not include pcap/dlt.h.  Our system
  net/dlt.h is pulled in from net/bpf.h.
- sys/net/dlt.h: Incorporate changes from libpcap 1.10.3.
- lib/libpcap/Makefile: Update for libpcap 1.10.3.

Changelog:	https://git.tcpdump.org/libpcap/blob/95691ebe7564afa3faa5c6ba0dbd17e351be455a:/CHANGES
Reviewed by:	emaste
Obtained from:	https://www.tcpdump.org/release/libpcap-1.10.3.tar.gz
Sponsored by:	The FreeBSD Foundation
2023-03-31 16:02:22 -03:00

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2.5 KiB
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.\" Copyright (c) 1994, 1996, 1997
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.\" ``This product includes software developed by the University of California,
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.TH PCAP_SETDIRECTION 3PCAP "5 March 2022"
.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
.BR 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
.BR 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
.BR pcap_setdirection ()
returns
.B 0
on success,
.B PCAP_ERROR_NOT_ACTIVATED
if called on a capture handle that has been created but not activated, or
.B PCAP_ERROR
on other errors. If
.B PCAP_ERROR
is returned,
.BR pcap_geterr (3PCAP)
or
.BR pcap_perror (3PCAP)
may be called with
.I p
as an argument to fetch or display the error text.
.SH SEE ALSO
.BR pcap (3PCAP)