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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) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title><net/if.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../../jscript/dotcode.js"></script><basefont size="3"> <a name="<net/if.h>"></a> <a name="tag_13_30"></a><!-- <net/if.h> --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_13_30_01"></a>NAME</h4><blockquote>net/if.h - sockets local interfaces</blockquote><h4><a name="tag_13_30_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <net/if.h></tt></p></blockquote><h4><a name="tag_13_30_03"></a>DESCRIPTION</h4><blockquote><p>The <i><net/if.h></i> header shall define the <b>if_nameindex</b> structure that includes at least the followingmembers:</p><pre><tt>unsigned if_index </tt> Numeric index of the interface. <tt>char *if_name </tt> Null-terminated name of the interface. <tt></tt></pre><p>The <i><net/if.h></i> header shall define the following macro for the length of a buffer containing an interface name(including the terminating NULL character):</p><dl compact><dt>IF_NAMESIZE</dt><dd>Interface name length.</dd></dl><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>unsigned if_nametoindex(const char *);char *if_indextoname(unsigned, char *);struct if_nameindex *if_nameindex(void);void if_freenameindex(struct if_nameindex *);</tt></pre></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_30_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_30_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_30_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_30_07"></a>SEE ALSO</h4><blockquote><p>The System Interfaces volume of IEEE Std 1003.1-2001, <a href="../../functions/if_freenameindex.html"><i>if_freenameindex</i>()</a>, <a href="../../functions/if_indextoname.html"><i>if_indextoname</i>()</a>, <a href="../../functions/if_nameindex.html"><i>if_nameindex</i>()</a>, <a href="../../functions/if_nametoindex.html"><i>if_nametoindex</i>()</a></p></blockquote><h4><a name="tag_13_30_08"></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 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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