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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">pcap_list_datalinks, pcap_free_datalinks - get a list of link-layer header types supported by a capture device, and free that list <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre class="level0">
&#35;include &lt;pcap/pcap.h&gt;
int pcap_list_datalinks(pcap_t *p, int **dlt_buf);
void pcap_free_datalinks(int *dlt_list);
</pre>

<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0"><span Class="bold">pcap_list_datalinks</span>() is used to get a list of the supported link-layer header types of the interface associated with the pcap descriptor. <span Class="bold">pcap_list_datalinks</span>() allocates an array to hold the list and sets <span Class="emphasis">*dlt_buf</span> to point to that array. 
<p class="level0">The caller is responsible for freeing the array with <span Class="bold">pcap_free_datalinks</span>(), which frees the list of link-layer header types pointed to by <span Class="emphasis">dlt_list</span>. 
<p class="level0">It must not be called on a pcap descriptor created by <span Class="bold">\%pcap_create</span>(3PCAP) that has not yet been activated by <span Class="bold">\%pcap_activate</span>(3PCAP). <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0"><span Class="bold">pcap_list_datalinks</span>() returns the number of link-layer header types in the array on success, <span Class="bold">PCAP_ERROR_NOT_ACTIVATED</span> if called on a capture handle that has been created but not activated, and <span Class="bold">PCAP_ERROR</span> on other errors. If <span Class="bold">PCAP_ERROR</span> is returned, <a Class="bold" href="./pcap_geterr.html">pcap_geterr</a>(3PCAP) or <span Class="bold">\%pcap_perror</span>(3PCAP) may be called with <span Class="emphasis">p</span> as an argument to fetch or display the error text. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a Class="bold" href="./pcap.html">pcap</a>(3PCAP), <a Class="bold" href="./pcap_datalink_val_to_name.html">pcap_datalink_val_to_name</a>(3PCAP), <a Class="bold" href="./pcap-linktype.html">pcap-linktype</a>(7) <p class="roffit">
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