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2015-01-06 18:58:31 +00:00
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.TH PCAP_LIST_DATALINKS 3PCAP "17 September 2013"
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2009-03-21 20:43:56 +00:00
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.SH NAME
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2012-01-31 17:22:07 +00:00
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pcap_list_datalinks, pcap_free_datalinks \- get a list of link-layer header
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types supported by a capture device, and free that list
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2009-03-21 20:43:56 +00:00
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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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2012-01-31 17:22:07 +00:00
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void pcap_free_datalinks(int *dlt_list);
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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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2012-01-31 17:22:07 +00:00
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is used to get a list of the supported link-layer header types of the
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interface associated with the pcap descriptor.
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2009-03-21 20:43:56 +00:00
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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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to point to that array.
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.LP
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2009-03-21 20:43:56 +00:00
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The caller is responsible for freeing the array with
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2012-01-31 17:22:07 +00:00
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.BR pcap_free_datalinks() ,
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which frees the list of link-layer header types pointed to by
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.IR dlt_list .
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2015-01-06 18:58:31 +00:00
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.LP
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It must not be called on a pcap descriptor created by
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.B pcap_create()
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that has not yet been activated by
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.BR pcap_activate() .
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2009-03-21 20:43:56 +00:00
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.SH RETURN VALUE
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.B pcap_list_datalinks()
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2015-01-06 18:58:31 +00:00
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returns the number of link-layer header types in the array 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,
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and
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.B PCAP_ERROR
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(\-1) on other errors.
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If
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.B PCAP_ERROR
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is returned,
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2009-03-21 20:43:56 +00:00
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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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2012-01-31 17:22:07 +00:00
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pcap(3PCAP), pcap_geterr(3PCAP),
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pcap_datalink_val_to_name(3PCAP),
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2009-03-21 20:43:56 +00:00
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pcap-linktype(@MAN_MISC_INFO@)
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