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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>htonl</title></head><body bgcolor="white"><basefont size="3"> <a name="htonl"></a> <a name="tag_03_265"></a><!-- htonl --> <!--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_03_265_01"></a>NAME</h4><blockquote>htonl, htons, ntohl, ntohs - convert values between host and network byte order</blockquote><h4><a name="tag_03_265_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/arpa/inet.h.html">arpa/inet.h</a>><br><br> uint32_t htonl(uint32_t</tt> <i>hostlong</i><tt>);<br> uint16_t htons(uint16_t</tt> <i>hostshort</i><tt>);<br> uint32_t ntohl(uint32_t</tt> <i>netlong</i><tt>);<br> uint16_t ntohs(uint16_t</tt> <i>netshort</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_265_03"></a>DESCRIPTION</h4><blockquote><p>These functions shall convert 16-bit and 32-bit quantities between network byte order and host byte order.</p><p>On some implementations, these functions are defined as macros.</p><p>The <b>uint32_t</b> and <b>uint16_t</b> types are defined in <a href="../basedefs/inttypes.h.html"><i><inttypes.h></i></a>.</p></blockquote><h4><a name="tag_03_265_04"></a>RETURN VALUE</h4><blockquote><p>The <i>htonl</i>() and <i>htons</i>() functions shall return the argument value converted from host to network byte order.</p><p>The <i>ntohl</i>() and <i>ntohs</i>() functions shall return the argument value converted from network to host byte order.</p></blockquote><h4><a name="tag_03_265_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_265_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_265_07"></a>APPLICATION USAGE</h4><blockquote><p>These functions are most often used in conjunction with IPv4 addresses and ports as returned by <a href="../functions/gethostent.html"><i>gethostent</i>()</a> and <a href="../functions/getservent.html"><i>getservent</i>()</a>.</p></blockquote><h4><a name="tag_03_265_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_265_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_265_10"></a>SEE ALSO</h4><blockquote><p><a href="endhostent.html"><i>endhostent</i>()</a>, <a href="endservent.html"><i>endservent</i>()</a>, the Base Definitionsvolume of IEEE Std 1003.1-2001, <a href="../basedefs/inttypes.h.html"><i><inttypes.h></i></a>, <a href="../basedefs/arpa/inet.h.html"><i><arpa/inet.h></i></a></p></blockquote><h4><a name="tag_03_265_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 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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