181 lines
5.1 KiB
HTML
181 lines
5.1 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_r()--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_r()--Open Host Database</h2>
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<div class="box" style="width: 60%;"><br>
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Syntax<br>
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<pre>
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#include <netdb.h>
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int sethostent_r(int <em>stay_open</em>,
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struct hostent_data *<em>hostent_data_struct_addr</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: Yes<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_r()</em> function is used in preparation for sequential
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access to the host database file. The <em>sethostent_r()</em> function opens
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the file and repositions the file marker to the beginning of the file. In
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addition, this call affects what type of transport service (connectionless
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versus connection-oriented) that is to be used when <em>gethostbyname_r()</em>
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and <em>gethostbyaddr_r()</em> need to retrieve host information from the
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domain name 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> (input) </dt>
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<dd>Specifies whether to leave the database file open after each call to
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<em>gethostbyname_r()</em> and <em>gethostbyaddr_r()</em>. A non-zero value
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will result in the database file being left open. Also, a non-zero value will
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result in the use of a connection-oriented transport service (for example, TCP)
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being used by <em>gethostbyname_r()</em> and <em>gethostbyaddr_r()</em> when
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host information is to be obtained from the domain name server.<br>
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<br>
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</dd>
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<dt>struct hostent_data *<strong>hostent_data_struct_addr</strong>
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(input/output) </dt>
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<dd>Specifies the pointer to the hostent_data structure, which is used to pass
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and preserve results between function calls. The field host_control_blk in the
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hostent_data structure must be initialized with hexadecimal zeros before its
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initial use. If compatibility with other platforms is required, then the entire
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hostent_data structure must be initialized to hexadecimal zeros before initial
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use.</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>The <em>sethostent_r()</em> function returns an integer. Possible values
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are:</p>
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<ul>
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<li>-1 (unsuccessful call)</li>
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<li>0 (successful call)</li>
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</ul>
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<p>The <strong>struct hostent_data</strong>denoted by
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<strong><em>hostent_data_struct_addr</em></strong> is defined in
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<strong><netdb.h></strong>.</p>
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<br>
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<h3>Error Conditions</h3>
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<p>When the <em>sethostent_r()</em> function fails, <em>h_errno</em> (defined
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in <strong><netdb.h></strong>) can be set to:</p>
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<dl>
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<dt><em>[NO_RECOVERY]</em></dt>
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<dd><p>An unrecoverable error has occurred.</p></dd>
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</dl>
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<p>When the <em>sethostent_r()</em> function fails, <em>errno</em> can be set
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to:</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>The hostent_data structure was not properly initialized to hexadecimal zeros before initial
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use. For corrective action, see the description for structure hostent_data.</p></dd>
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</dl>
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<br>
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<h3>Usage Notes</h3>
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<p>The iSeries Navigator or the following CL commands can be
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used to access the host database file:</p>
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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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<h3>Related Information</h3>
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<ul>
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<li><a href="tsghosta.htm">gethostbyaddr_r()</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="tsghostb.htm">gethostbyname_r()</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="tsehoste.htm">endhostent_r()</a>--Close Host Database<br>
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<br>
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</li>
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<li><a href="tsghoste.htm">gethostent_r()</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: V4R2
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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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