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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">pcap_lookupnet - find the IPv4 network number and netmask for a device <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];
int pcap_lookupnet(const char *device, bpf_u_int32 *netp,
&nbsp;&nbsp;&nbsp;&nbsp;bpf_u_int32 *maskp, char *errbuf);
</pre>

<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0"><span Class="bold">pcap_lookupnet</span>() is used to determine the IPv4 network number and mask associated with the network device <span Class="emphasis">device</span>. Both <span Class="emphasis">netp</span> and <span Class="emphasis">maskp</span> are <span Class="emphasis">bpf_u_int32</span> pointers. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0"><span Class="bold">pcap_lookupnet</span>() returns <span Class="bold">0</span> on success and <span Class="bold">PCAP_ERROR</span> on failure. If <span Class="bold">PCAP_ERROR</span> is returned, <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) <p class="roffit">
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