@(#) $Header: /tcpdump/master/libpcap/pcap_list_datalinks.3pcap.in,v 1.1 2008-10-21 07:33:02 guy Exp $
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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.
PCAP_LIST_DATALINKS 3PCAP "22 August 2010"
NAME
pcap_list_datalinks, pcap_free_datalinks - get a list of link-layer header
types supported by a capture device, and free that list
SYNOPSIS
#include <pcap/pcap.h>int pcap_list_datalinks(pcap_t *p, int **dlt_buf); void pcap_free_datalinks(int *dlt_list);
DESCRIPTION
pcap_list_datalinks() is used to get a list of the supported link-layer header types of the
interface associated with the pcap descriptor.
pcap_list_datalinks() allocates an array to hold the list and sets
*dlt_buf to point to that array.
The caller is responsible for freeing the array with pcap_free_datalinks() , which frees the list of link-layer header types pointed to by dlt_list .
It must not be called on a pcap descriptor created by pcap_create() that has not yet been activated by pcap_activate() .
RETURN VALUE
pcap_list_datalinks() returns the number of link-layer header types in the array on success,
PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but not activated,
and
PCAP_ERROR (-1) on other errors.
If
PCAP_ERROR is returned,
pcap_geterr() or
pcap_perror() may be called with
p as an argument to fetch or display the error text.
SEE ALSO
pcap(3PCAP), pcap_geterr(3PCAP),
pcap_datalink_val_to_name(3PCAP),
pcap-linktype(@MAN_MISC_INFO@)
