# if.h<a name="ZH-CN_TOPIC_0000001054909430"></a>

## **Overview**<a name="section2122679988084830"></a>

**Related Modules:**

[NET](NET.md)

**Description:**

Provides functions and data structures related to network operations. For example, you can use the functions to send and receive network data, manage network addresses, and convert bytes. 

**Since:**

1.0

**Version:**

1.0

## **Summary**<a name="section1603914972084830"></a>

## Data Structures<a name="nested-classes"></a>

<a name="table1042868649084830"></a>
<table><thead align="left"><tr id="row527239515084830"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p165877076084830"><a name="p165877076084830"></a><a name="p165877076084830"></a>Data Structure Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p1461041578084830"><a name="p1461041578084830"></a><a name="p1461041578084830"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row919513659084830"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1617998738084830"><a name="p1617998738084830"></a><a name="p1617998738084830"></a><a href="if_nameindex.md">if_nameindex</a></p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p1408250888084830"><a name="p1408250888084830"></a><a name="p1408250888084830"></a>Defines the network adapter information. </p>
</td>
</tr>
</tbody>
</table>

## Functions<a name="func-members"></a>

<a name="table52565886084830"></a>
<table><thead align="left"><tr id="row1478802661084830"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p753722789084830"><a name="p753722789084830"></a><a name="p753722789084830"></a>Function Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p187282137084830"><a name="p187282137084830"></a><a name="p187282137084830"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row1328509476084830"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1414987155084830"><a name="p1414987155084830"></a><a name="p1414987155084830"></a><a href="NET.md#ga7fe55c04ac2116fa501338fdcb279cc9">if_freenameindex</a> (struct <a href="if_nameindex.md">if_nameindex</a> *idx)</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.2 "><p id="p953126133084830"><a name="p953126133084830"></a><a name="p953126133084830"></a>void&nbsp;</p>
<p id="p1961000965084830"><a name="p1961000965084830"></a><a name="p1961000965084830"></a>Frees the network adapter information obtained by <a href="if_nameindex.md">if_nameindex</a>. </p>
</td>
</tr>
</tbody>
</table>