pcap_list_datalinks.3pcap.in 2.54 KB
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.TH PCAP_LIST_DATALINKS 3PCAP "8 March 2015"
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.SH NAME
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pcap_list_datalinks, pcap_free_datalinks \- get a list of link-layer header
types supported by a capture device, and free that list
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.SH SYNOPSIS
.nf
.ft B
#include <pcap/pcap.h>
.ft
.LP
.ft B
int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
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void pcap_free_datalinks(int *dlt_list);
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.ft
.fi
.SH DESCRIPTION
.B pcap_list_datalinks()
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is used to get a list of the supported link-layer header types of the
interface associated with the pcap descriptor.
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.B pcap_list_datalinks()
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.
.LP
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The caller is responsible for freeing the array with
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.BR pcap_free_datalinks() ,
which frees the list of link-layer header types pointed to by
.IR dlt_list .
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.LP
It must not be called on a pcap descriptor created by
.B pcap_create()
that has not yet been activated by
.BR pcap_activate() .
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.SH RETURN VALUE
.B pcap_list_datalinks()
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returns the number of link-layer header types in the array on success,
.B PCAP_ERROR_NOT_ACTIVATED
if called on a capture handle that has been created but not activated,
and
.B PCAP_ERROR
(\-1) on other errors.
If
.B PCAP_ERROR
is returned,
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.B pcap_geterr()
or
.B pcap_perror()
may be called with
.I p
as an argument to fetch or display the error text.
.SH SEE ALSO
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pcap(3PCAP), pcap_geterr(3PCAP),
pcap_datalink_val_to_name(3PCAP),
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pcap-linktype(@MAN_MISC_INFO@)