150 lines
3.7 KiB
HTML
150 lines
3.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>htonl()--Convert Long Integer to Network Byte Order</title>
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<a name="Top_Of_Page"></a>
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<h2>htonl()--Convert Long Integer to Network Byte Order</h2>
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<div class="box" style="width: 70%;">
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<br>
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BSD 4.3 Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <netinet/in.h>
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unsigned long htonl(unsigned long <em>host_long</em>)
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</pre>
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<br>
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<div class="box" style="width: 70%;">
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<br>
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<a href="_xopen_source.htm">UNIX 98 Compatible Syntax</a><br>
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<pre>
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#define _XOPEN_SOURCE 520
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#include <netinet/in.h>
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uint32_t htonl(uint32_t <em>host_long</em>)
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</pre>
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<br>
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<p>The <em>htonl()</em> function is used to convert a long (4-byte) integer
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from the local host byte order to standard network byte order.</p>
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<p>There are two versions of the API, as shown above. The base i5/OS API uses
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BSD 4.3 structures and syntax. The other uses syntax and structures compatible
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with the UNIX 98 programming interface specifications. You can select the UNIX
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98 compatible interface with the <a href="_xopen_source.htm">_XOPEN_SOURCE</a> macro.
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</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>host_long</strong></dt>
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<dd>(Input) The 4-byte integer in local host byte order that is to be converted
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to standard network byte order.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>No authorization is required.</p>
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<br>
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<h3>Return Value</h3>
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<p><em>htonl()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>n (where n is the 4-byte integer in standard network byte order)</li>
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</ul>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li>On the iSeries server, the value returned to the caller is the same as the
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value that was passed to <em>htonl()</em>, since the local host byte order does
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not differ from the standard network byte order.</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href="_xopen_source.htm">_XOPEN_SOURCE</a>--Using _XOPEN_SOURCE for the UNIX 98
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compatible interface<br>
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<br>
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</li>
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<li><a href="ntohl.htm">ntohl(</a>)--Convert Long Integer to Host Byte
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Order<br>
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<br>
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</li>
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<li><a href="htons.htm">htons()</a>--Convert Short Integer to Network Byte
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Order<br>
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<br>
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</li>
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<li><a href="ntohs.htm">ntohs()</a>--Convert Short Integer to Host Byte
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Order</li>
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</ul>
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<br>
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<hr>
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API introduced: V3R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a> </td>
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</tr>
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</table>
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</center>
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</html>
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