129 lines
3.4 KiB
HTML
129 lines
3.4 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>gethostid()--Retrieve Host ID</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>gethostid()--Retrieve Host ID</h2>
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<div class="box" style="width: 80%;">
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<br>
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Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <sys/socket.h>
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int gethostid()
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</pre>
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<br>
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Service Program Name: QSOSRV1<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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nbsp;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>gethostid()</em> function is used to retrieve a host's ID.</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>gethostid()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>0 when a <em>sethostid()</em> has not been issued previously since the last
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initial program load (IPL)<br>
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<br>
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</li>
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<li>n (successful), where n is the number specified on a previously issued
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<em>sethostid()</em> call</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>When a process issues a <em>sethostid()</em>, the <em>host_id</em> can be
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accessed by any process that issues a <em>gethostid()</em><br>
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<br>
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</li>
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<li>The <em>host_id</em> is reset to zero when an initial program load is
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performed.<br>
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<br>
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</li>
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<li>The <em>host_id</em> is a signed integer. Therefore, a -1 return value from
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the <em>gethostid()</em> may not indicate an error, but rather that a previous
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<em>sethostid()</em> was issued that specified a <em>host_id</em> of -1.<br>
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<br>
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</li>
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<li>While many socket implementations refer to the <em>host_id</em> as the IP
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address of the machine, this is not necessarily the case. Many machines that
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support the TCP/IP protocol suite support multiple local IP addresses. The
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value contained in <em>host_id</em> is <strong>not</strong> used by TCP in any
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manner.</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="shosti.htm">sethostid()</a>--Set Host ID Address<br>
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<br>
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</li>
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<li><a href="ghostn.htm">gethostname()</a>--Retrieve Host Name<br>
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<br>
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</li>
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<li><a href="shostn.htm">sethostname()</a>--Set Host Name</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></center>
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</body>
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</html>
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