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

-   [Overview](#section1196228301165628)
-   [Summary](#section2104012372165628)
-   [Data Structures](#nested-classes)
-   [Functions](#func-members)

## **Overview**<a name="section1196228301165628"></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="section2104012372165628"></a>

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

<a name="table1296480169165628"></a>
<table><thead align="left"><tr id="row2056139280165628"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p295483926165628"><a name="p295483926165628"></a><a name="p295483926165628"></a>Data Structure Name</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p352310575165628"><a name="p352310575165628"></a><a name="p352310575165628"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row1185419305165628"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1887620513165628"><a name="p1887620513165628"></a><a name="p1887620513165628"></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="p1183714321165628"><a name="p1183714321165628"></a><a name="p1183714321165628"></a>Defines the network adapter information. </p>
</td>
</tr>
</tbody>
</table>

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

<a name="table1876416686165628"></a>
<table><thead align="left"><tr id="row1555016043165628"><th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.1"><p id="p933150055165628"><a name="p933150055165628"></a><a name="p933150055165628"></a>Function</p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.1.3.1.2"><p id="p1991806914165628"><a name="p1991806914165628"></a><a name="p1991806914165628"></a>Description</p>
</th>
</tr>
</thead>
<tbody><tr id="row1037300220165628"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.1.3.1.1 "><p id="p1080588241165628"><a name="p1080588241165628"></a><a name="p1080588241165628"></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="p161731281165628"><a name="p161731281165628"></a><a name="p161731281165628"></a>void </p>
<p id="p296043001165628"><a name="p296043001165628"></a><a name="p296043001165628"></a>Frees the network adapter information obtained by <a href="if_nameindex.md">if_nameindex</a>. </p>
</td>
</tr>
</tbody>
</table>