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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>if_nameindex</title></head><body bgcolor="white"><basefont size="3"> <a name="if_nameindex"></a> <a name="tag_03_272"></a><!-- if_nameindex --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_272_01"></a>NAME</h4><blockquote>if_nameindex - return all network interface names and indexes</blockquote><h4><a name="tag_03_272_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/net/if.h.html">net/if.h</a>><br><br> struct if_nameindex *</tt><i>if_nameindex</i><tt>(void);<br></tt></code></p></blockquote><h4><a name="tag_03_272_03"></a>DESCRIPTION</h4><blockquote><p>The <i>if_nameindex</i>() function shall return an array of <i>if_nameindex</i> structures, one structure per interface. The endof the array is indicated by a structure with an <i>if_index</i> field of zero and an <i>if_name</i> field of NULL.</p><p>Applications should call <a href="../functions/if_freenameindex.html"><i>if_freenameindex</i>()</a> to release the memory thatmay be dynamically allocated by this function, after they have finished using it.</p></blockquote><h4><a name="tag_03_272_04"></a>RETURN VALUE</h4><blockquote><p>An array of structures identifying local interfaces. A NULL pointer is returned upon an error, with <i>errno</i> set to indicatethe error.</p></blockquote><h4><a name="tag_03_272_05"></a>ERRORS</h4><blockquote><p>The <i>if_nameindex</i>() function may fail if:</p><dl compact><dt>[ENOBUFS]</dt><dd>Insufficient resources are available to complete the function.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_272_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_272_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_272_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_272_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_272_10"></a>SEE ALSO</h4><blockquote><p><a href="getsockopt.html"><i>getsockopt</i>()</a> , <a href="if_freenameindex.html"><i>if_freenameindex</i>()</a> , <a href="if_indextoname.html"><i>if_indextoname</i>()</a> , <a href="if_nametoindex.html"><i>if_nametoindex</i>()</a> , <a href="setsockopt.html"><i>setsockopt</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/net/if.h.html"><i><net/if.h></i></a></p></blockquote><h4><a name="tag_03_272_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from the XNS, Issue 5.2 specification.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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