161 lines
4.4 KiB
HTML
161 lines
4.4 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>sethostent()--Open Host Database</title>
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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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<!-- Begin Header Records ========================================== -->
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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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<!--End Header Records -->
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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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<a name="Top_Of_Page"></a>
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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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<h2>sethostent()--Open 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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void sethostent(int <em>stay_open</em>)
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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>sethostent()</em> function is used to prepare for sequential access
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to the host database file. <em>sethostent()</em> opens the file and repositions
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the file marker to the beginning of the file. In addition,
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<em>sethostent()</em> affects what type of transport service (connectionless
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versus connection-oriented) is to be used when <em>gethostbyname()</em> and
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<em>gethostbyaddr()</em> need to retrieve host information from the domain name
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server.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt>int <strong>stay_open</strong></dt>
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<dd>(Input) Specifies whether to leave the database file open after each call
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to <em>gethostbyname()</em> and <em>gethostbyaddr()</em>. A nonzero value
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results in the database file being left open. Also, a nonzero value results in
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the use of a connection-oriented transport service (for example, TCP) being
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used by <em>gethostbyname()</em> and <em>gethostbyaddr()</em> when host
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information is to be obtained from the domain name server.</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>Error Conditions</h3>
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<p>When <em>sethostent()</em> fails, <em>h_errno</em> (defined in
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<strong><netdb.h></strong>) can be set to one of the following:</p>
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<dl>
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<dt><em><samp>NO_RECOVERY</samp></em></dt>
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<dd><p>An unrecoverable error has occurred.</p></dd>
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</dl>
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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: <br><br>
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<ul>
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<li>ADDTCPHTE (Add TCP/IP Host Table Entry</li>
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<li>RMVTCPHTE (Remove TCP/IP Host Table Entry)</li>
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<li>CHGTCPHTE (Change TCP/IP Host Table Entry)</li>
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<li>RNMTCPHTE (Rename TCP/IP Host Table Entry)</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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</li>
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<li>Do not use the <em>sethostent()</em> function in a multithreaded
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environment. See the multithread alternative <em>sethostent_r()</em>
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function.<br>
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<br>
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</li>
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<li>When you develop in C-based languages and an application is compiled with
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the _XOPEN_SOURCE macro defined to the value 520 or greater, the <em>sethostent()</em>
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API is mapped to<em>qso_sethostent98()</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 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="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="ghostnt.htm">gethostent()</a>--Get Next Entry from Host
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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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