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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">pcap_lookupdev - find the default device on which to capture <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><pre class="level0">
&#35;include &lt;pcap/pcap.h&gt;
<pre class="level0">
char errbuf[PCAP_ERRBUF_SIZE];
[DEPRECATED] char *pcap_lookupdev(char *errbuf);
</pre>

<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0"><span Class="bold">This interface is obsoleted by</span> <a Class="bold" href="./pcap_findalldevs.html">pcap_findalldevs</a>(3PCAP). To find a default device on which to capture, call <span Class="bold">pcap_findalldevs</span>() and, if the list it returns is not empty, use the first device in the list.  (If the list is empty, there are no devices on which capture is possible.) 
<p class="level0"><span Class="bold">If</span> <a Class="bold" href="./pcap_init.html">pcap_init</a>(3PCAP) <span Class="bold">has been called, this interface always returns</span> <span Class="bold">NULL</span>. 
<p class="level0"><span Class="bold">pcap_lookupdev</span>() returns a pointer to a string giving the name of a network device suitable for use with <a Class="bold" href="./pcap_create.html">pcap_create</a>(3PCAP) and <span Class="bold">\%pcap_activate</span>(3PCAP), or with <a Class="bold" href="./pcap_open_live.html">pcap_open_live</a>(3PCAP), and with <a Class="bold" href="./pcap_lookupnet.html">pcap_lookupnet</a>(3PCAP). If there is an error, or if <a Class="bold" href="./pcap_init.html">pcap_init</a>(3PCAP) has been called, <span Class="bold">NULL</span> is returned and <span Class="emphasis">errbuf</span> is filled in with an appropriate error message. <span Class="emphasis">errbuf</span> is assumed to be able to hold at least <span Class="bold">PCAP_ERRBUF_SIZE</span> chars. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a Class="bold" href="./pcap.html">pcap</a>(3PCAP) <a name="BUGS"></a><h2 class="nroffsh">BUGS</h2>
<p class="level0">The pointer returned by <span Class="bold">pcap_lookupdev</span>() points to a static buffer; subsequent calls to <span Class="bold">pcap_lookupdev</span>() in the same thread, or calls to <span Class="bold">pcap_lookupdev</span>() in another thread, may overwrite that buffer. 
<p class="level0">In WinPcap and Npcap, this function may return a UTF-16 string rather than an ASCII or UTF-8 string. <p class="roffit">
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