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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">pcap_set_datalink - set the link-layer header type to be used by a capture device <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre class="level0">
&#35;include &lt;pcap/pcap.h&gt;
int pcap_set_datalink(pcap_t *p, int dlt);
</pre>

<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0"><span Class="bold">pcap_set_datalink</span>() is used to set the current link-layer header type of the pcap descriptor to the type specified by <span Class="emphasis">dlt</span>. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0"><span Class="bold">pcap_set_datalink</span>() returns <span Class="bold">0</span> on success, <span Class="bold">PCAP_ERROR_NOT_ACTIVATED</span> if called on a capture handle that has been created but not activated, or <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_name_to_val.html">pcap_datalink_name_to_val</a>(3PCAP) <p class="roffit">
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