2009-03-21 20:43:56 +00:00
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.\" @(#) $Header: /tcpdump/master/libpcap/pcap_list_datalinks.3pcap.in,v 1.1.2.2 2008-10-21 07:44:57 guy Exp $
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.\"
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.\" 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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.\" 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_LIST_DATALINKS 3PCAP "5 April 2008"
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.SH NAME
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pcap_list_datalinks \- get a list of link-layer header types supported
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by a capture device
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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_list_datalinks(pcap_t *p, int **dlt_buf);
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.ft
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.fi
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.SH DESCRIPTION
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.B pcap_list_datalinks()
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is used to get a list of the supported data link types of the interface
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associated with the pcap descriptor.
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.B pcap_list_datalinks()
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allocates an array to hold the list and sets
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.IR *dlt_buf .
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The caller is responsible for freeing the array with
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.BR pcap_free_datalinks (3PCAP).
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.SH RETURN VALUE
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.B pcap_list_datalinks()
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returns the number of data link types in the array on success and \-1
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on failure.
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If \-1 is returned,
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.B pcap_geterr()
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or
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.B pcap_perror()
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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), pcap_geterr(3PCAP), pcap_free_datalinks(3PCAP),
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2009-03-21 22:58:08 +00:00
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pcap-linktype(7)
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