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<title>uIP 1.0: Variables used in uIP device drivers</title>
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<h1>Variables used in uIP device drivers<br>
<small>
[<a class="el" href="a00150.html">The uIP TCP/IP stack</a>]</small>
</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
uIP has a few global variables that are used in device drivers for uIP. 
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<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The length of the packet in the uip_buf buffer.  <a href="#g12a33f0c09711167bdf3dd7d7cf8c5a1"></a><br></td></tr>
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<hr><h2>Variable Documentation</h2>
<a class="anchor" name="g12a33f0c09711167bdf3dd7d7cf8c5a1"></a><!-- doxytag: member="uip.h::uip_len" ref="g12a33f0c09711167bdf3dd7d7cf8c5a1" args="" --><p>
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          <td class="md" nowrap valign="top"><a class="el" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="el" href="a00150.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>          </td>
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<p>
The length of the packet in the uip_buf buffer. 
<p>
The global variable uip_len holds the length of the packet in the uip_buf buffer.<p>
When the network device driver calls the uIP input function, uip_len should be set to the length of the packet in the uip_buf buffer.<p>
When sending packets, the device driver should use the contents of the uip_len variable to determine the length of the outgoing packet. <dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="a00042.html#a68">example-mainloop-with-arp.c</a>, and <a class="el" href="a00043.html#a92">example-mainloop-without-arp.c</a>.</dl>
<p>
Definition at line <a class="el" href="a00201.html#l00155">155</a> of file <a class="el" href="a00201.html">uip.c</a>.
<p>
Referenced by <a class="el" href="a00204.html#l00278">uip_arp_arpin()</a>, <a class="el" href="a00201.html#l00682">uip_process()</a>, and <a class="el" href="a00199.html#l00049">uip_split_output()</a>.    </td>
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