73 lines
2.4 KiB
Plaintext
73 lines
2.4 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 "25 July 2018"
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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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.B 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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.B 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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.B pcap_setdirection()
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returns 0 on success and
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.B PCAP_ERROR
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on failure. If
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.B PCAP_ERROR
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is returned,
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.B pcap_geterr(3PCAP)
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or
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.B 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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pcap(3PCAP)
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