184 lines
4.9 KiB
HTML
184 lines
4.9 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>getservent()--Get Next Entry from Service 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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<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 --><!-- Edited by Kersten Feb 02 -->
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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>getservent()--Get Next Entry from Service 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 servent *getservent()
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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>getservent()</em> function is used to retrieve information about
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services (the protocol being used by the service and the port number assigned
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for the service). The information is retrieved from the services database file.
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When <em>getservent()</em> is first called, the file is opened, and the first
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entry is returned. Each subsequent call to <em>getservent()</em> results in the
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next entry in the file being returned. To close the file, use
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<em>endservent()</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>getservent()</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 servent</strong>.
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<pre>
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struct servent {
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char *s_name;
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char **s_aliases;
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int s_port;
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char *s_proto
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};
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</pre>
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<p><em>s_name</em> points to the character string that contains the name of the
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service. <em>s_aliases</em> is a pointer to a NULL-terminated array of
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alternate names for the service. <em>s_port</em> is the port number assigned to
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the service. <em>s_proto</em> is the protocol being used by the service.</p>
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</li>
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</ul>
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<p>The structure <strong>struct servent</strong> is defined in
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<strong><netdb.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 services database file:
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<ul>
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<li>WRKSRVTBLE (Work with Service Table Entries)<br>
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<br>
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</li>
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<li>ADDSRVTBLE (Add Service Table Entry)<br>
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<br>
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</li>
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<li>RMVSRVTBLE (Remove Service Table Entry)</li>
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</ul>
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<br>
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</li>
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<li>The pointer returned by <em>getservent()</em> points to static storage that
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is overwritten on subsequent calls to the <em>getservent()</em>,
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<em>getservbyname()</em>, or <em>getservbyport()</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 for the job requests that
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no database translation be performed. For translation to occur for the service
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names returned in the servent structure, the job CCSID must be something other
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than 65535.<br>
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<br>
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</li>
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<li>Do not use the <em>getservent()</em> function in a multithreaded
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environment. See the multithread alternative <em>getservent_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 the _XOPEN_SOURCE
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macro defined to the value 520 or greater, the <em>getservent()</em> API is mapped to
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<em>qso_getservent98()</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="gsrvnm.htm">getservbyname()</a>--Get Port Number for Service
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Name<br>
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<br>
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</li>
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<li><a href="gsrvprt.htm">getservbyport()</a>--Get Service Name for Port
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Number<br>
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<br>
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</li>
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<li><a href="esrvnt.htm">endservent()</a>--Close Service Database<br>
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<br>
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</li>
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<li><a href="ssrvnt.htm">setservent()</a>--Open Service 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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