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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><arpa/inet.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../../jscript/dotcode.js"></script><basefont size="3"> <a name="<arpa/inet.h>"></a> <a name="tag_13_03"></a><!-- <arpa/inet.h> --> <!--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_13_03_01"></a>NAME</h4><blockquote>arpa/inet.h - definitions for internet operations</blockquote><h4><a name="tag_13_03_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <arpa/inet.h></tt></p></blockquote><h4><a name="tag_13_03_03"></a>DESCRIPTION</h4><blockquote><p>The <b>in_port_t</b> and <b>in_addr_t</b> types shall be defined as described in <a href="../netinet/in.h.html#tag_13_32"><i><netinet/in.h></i></a> .</p><p>The <b>in_addr</b> structure shall be defined as described in <a href="../netinet/in.h.html#tag_13_32"><i><netinet/in.h></i></a> .</p><p>The INET_ADDRSTRLEN <sup>[<a href="javascript:open_code('IP6')">IP6</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border="0"> and INET6_ADDRSTRLEN <img src="../../images/opt-end.gif" alt="[Option End]" border="0"> macrosshall be defined as described in <a href="../netinet/in.h.html#tag_13_32"><i><netinet/in.h></i></a> .</p><p>The following shall either be declared as functions, defined as macros, or both. If functions are declared, function prototypesshall be provided.</p><pre><tt>uint32_t htonl(uint32_t);uint16_t htons(uint16_t);uint32_t ntohl(uint32_t);uint16_t ntohs(uint16_t);</tt></pre><p>The <b>uint32_t</b> and <b>uint16_t</b> types shall be defined as described in <a href="../inttypes.h.html#tag_13_20"><i><inttypes.h></i></a> .</p><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>in_addr_t inet_addr(const char *);char *inet_ntoa(struct in_addr);const char *inet_ntop(int, const void *restrict, char *restrict, socklen_t);int inet_pton(int, const char *restrict, void *restrict);</tt></pre><p>Inclusion of the <i><arpa/inet.h></i> header may also make visible all symbols from <a href="../../basedefs/netinet/in.h.html"><i><netinet/in.h></i></a> and <a href="../../basedefs/inttypes.h.html"><i><inttypes.h></i></a>.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_03_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_03_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_03_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_03_07"></a>SEE ALSO</h4><blockquote><p><a href="../netinet/in.h.html#tag_13_32"><i><netinet/in.h></i></a> , <a href="../inttypes.h.html#tag_13_20"><i><inttypes.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <ahref="../../functions/htonl.html"><i>htonl</i>()</a>, <a href="../../functions/inet_addr.html"><i>inet_addr</i>()</a></p></blockquote><h4><a name="tag_13_03_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from the XNS, Issue 5.2 specification.</p><p>The <b>restrict</b> keyword is added to the prototypes for <a href="../../functions/inet_ntop.html"><i>inet_ntop</i>()</a> and<a href="../../functions/inet_pton.html"><i>inet_pton</i>()</a>.</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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