6f9cba8f8b
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
77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_SETDIRECTION 3PCAP "5 March 2022"
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.SH NAME
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pcap_setdirection \- set the direction for which packets will be captured
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.ft
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.LP
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.ft B
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int pcap_setdirection(pcap_t *p, pcap_direction_t d);
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.ft
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.fi
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.SH DESCRIPTION
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.BR pcap_setdirection ()
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is used to specify a direction that packets will be captured.
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.I d
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is one of the constants
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.BR PCAP_D_IN ,
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.B PCAP_D_OUT
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or
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.BR PCAP_D_INOUT .
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.B PCAP_D_IN
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will only capture packets received by the device,
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.B PCAP_D_OUT
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will only capture packets sent by the device and
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.B PCAP_D_INOUT
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will capture packets received by or sent by the device.
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.B PCAP_D_INOUT
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is the default setting if this function is not called.
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.PP
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.BR pcap_setdirection ()
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isn't necessarily fully supported on all platforms; some platforms might
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return an error for all values, and some other platforms might not
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support
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.BR PCAP_D_OUT .
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.PP
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This operation is not supported if a ``savefile'' is being read.
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.SH RETURN VALUE
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.BR pcap_setdirection ()
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returns
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.B 0
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on success,
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.B PCAP_ERROR_NOT_ACTIVATED
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if called on a capture handle that has been created but not activated, or
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.B PCAP_ERROR
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on other errors. If
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.B PCAP_ERROR
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is returned,
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.BR pcap_geterr (3PCAP)
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or
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.BR pcap_perror (3PCAP)
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may be called with
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.I p
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as an argument to fetch or display the error text.
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.SH SEE ALSO
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.BR pcap (3PCAP)
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