197 lines
5.3 KiB
HTML
197 lines
5.3 KiB
HTML
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<!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>gethostent()--Get Next Entry from Host Database</title>
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<!-- Begin Header Records ========================================== -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Change History: -->
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<!-- Unix8 SCRIPT J converted by B2H R4.1 (346) (CMS) by V2KEA304 -->
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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- Edited by Kersten Feb 02 -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!--End Header Records -->
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<!-- Java sync-link -->
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>gethostent()--Get Next Entry from Host Database</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <netdb.h>
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struct hostent *gethostent()
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</pre>
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<br>
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Service Program Name: QSOSRV2<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: No; see <a href="#USAGE_NOTES">Usage Notes</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <em>gethostent()</em> function is used to retrieve information from the
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host database file. When <em>gethostent()</em> is first called, the file is
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opened, and the first entry is returned. Each subsequent call to
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<em>gethostent()</em> results in the next entry in the file being returned. To
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close the file, use <em>endhostent()</em>.</p>
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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>gethostent()</em> returns a pointer. Possible values are:</p>
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<ul>
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<li>NULL (unsuccessful or end-of-file)<br>
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<br>
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</li>
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<li>p (successful), where p is a pointer to <strong>struct
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hostent</strong>.</li>
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</ul>
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<p>The structure <strong>struct hostent</strong> is defined in
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<strong><netdb.h></strong>.</p>
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<pre>
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struct hostent {
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char *h_name;
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char **h_aliases;
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int h_addrtype;
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int h_length;
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char **h_addr_list;
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};
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#define h_addr h_addr_list[0]
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</pre>
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<p><em>h_name</em> points to the character string that contains the name of the
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host. <em>h_aliases</em> is a pointer to a NULL-terminated list of pointers,
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each of which points to a character string that represents an alternative name
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for the host. <em>h_addrtype</em> contains the address type of the host (for
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example, <samp>AF_INET</samp>). <em>h_length</em> contains the address length.
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<em>h_addr_list</em> is a pointer to a NULL-terminated list of pointers, each
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of which points to a network address for the host, in network byte order. Note
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that the array of address pointers points to structures of type
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<strong>in_addr</strong> defined in <strong><netinet/in.h></strong>.</p>
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<br>
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<h3><a name="USAGE_NOTES">Usage Notes</a></h3>
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<ol>
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<li>The iSeries Navigator or the following CL commands can be
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used to access the host database file:
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<ul>
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<li>ADDTCPHTE (Add TCP/IP Host Table Entry)<br>
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<br>
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</li>
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<li>RMVTCPHTE (Remove TCP/IP Host Table Entry)<br>
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<br>
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</li>
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<li>CHGTCPHTE (Change TCP/IP Host Table Entry)<br>
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<br>
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</li>
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<li>RNMTCPHTE (Rename TCP/IP Host Table Entry)<br>
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<br>
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</li>
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<li>MRGTCPHT (Merge TCP/IP Host Tables)</li>
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</ul>
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<br>
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<br>
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</li>
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<li>The pointer returned by <em>gethostent()</em> points to static storage that
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is overwritten on subsequent calls to the <em>gethostent()</em>,
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<em>gethostbyaddr()</em>, or <em>gethostbyname()</em> functions.<br>
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<br>
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</li>
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<li>A coded character set identifier (CCSID) of 65535 requests that no database
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translation be performed. For translation to occur for the host names in the
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hostent structure, the job CCSID must be something other than 65535.<br>
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<br>
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</li>
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<li>Do not use the <em>gethostent()</em> function in a multithreaded
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environment. See the multithread alternative <em>gethostent_r()</em>
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function.<br><br></li>
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<li>When you develop in C-based languages and an application is compiled with the _XOPEN_SOURCE
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macro defined to the value 520 or greater, the <em>gethostent()</em> API is mapped to
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<em>qso_gethostent98()</em>.</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
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UNIX 98 compatible interface<br>
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<br>
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</li>
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<li><a href="ghosta.htm">gethostbyaddr()</a>--Get Host Information for IP
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Address<br>
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<br>
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</li>
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<li><a href="ghostnm.htm">gethostbyname()</a>--Get Host Information for Host
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Name<br>
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<br>
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</li>
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<li><a href="ehostnt.htm">endhostent()</a>--Close Host Database<br>
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<br>
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</li>
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<li><a href="shostnt.htm">sethostent()</a>--Open Host Database</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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</body>
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</html>
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