274 lines
6.6 KiB
HTML
274 lines
6.6 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>sethostname()--Set Host Name</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>sethostname()--Set Host Name</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 <sys/types.h>
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#include <sys/socket.h>
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int sethostname(char *<em>name</em>,
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int <em>length</em>)
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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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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>sethostname()</em> function is used to set the name of the host for
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a system.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>name</strong></dt>
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<dd>(Input) The pointer to a character array where the host name is stored.<br>
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<br>
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</dd>
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<dt><strong>length</strong></dt>
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<dd>(Input) The length of the <em>name</em> parameter.</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><em>sethostname()</em> returns an integer. Possible values are:</p>
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<ul>
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<li>-1 (unsuccessful)<br>
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<br>
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</li>
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<li>0 (successful)</li>
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</ul>
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<br>
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<h3>Error Conditions</h3>
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<p>When <em>sethostname()</em> fails, <em>errno</em> can be set to one of the
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following:</p>
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<table cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<td align="left" valign="top"><em>[EFAULT]</em></td>
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<td align="left" valign="top">Bad address.
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<p>The system detected an address which was not valid while attempting to
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access the <em>name</em> parameter.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EINVAL]</em></td>
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<td align="left" valign="top">Parameter not valid.
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<p>This error code indicates one of the following:</p>
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<ul>
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<li>The <em>length</em> parameter specifies a negative value or a value that is
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greater than the allowed maximum length.<br>
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<br>
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</li>
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<li>The host name pointed to by the <em>name</em> parameter contains characters
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that are not invariant.</li>
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</ul>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EPERM]</em></td>
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<td align="left" valign="top">Operation not permitted.
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<p>The process does not have the appropriate privileges to use
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<em>sethostname()</em>.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EIO]</em></td>
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<td align="left" valign="top">Input/output error.<br>
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<br>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>[EUNKNOWN]</em></td>
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<td align="left" valign="top">Unknown system state.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Error Messages</h3>
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<table width="100%" cellpadding="5">
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<!-- cols="15 85" -->
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<tr>
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<th align="left" valign="top">Message ID</th>
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<th align="left" valign="top">Error Message Text</th>
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</tr>
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<tr>
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<td width="15%" valign="top">CPE3418 E</td>
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<td width="85%" valign="top">Possible APAR condition or hardware failure.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPF9872 E</td>
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<td align="left" valign="top">Program or service program &1 in library
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&2 ended. Reason code &3.</td>
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</tr>
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<tr>
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<td align="left" valign="top">CPFA081 E</td>
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<td align="left" valign="top">Unable to set return value or error code.</td>
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</tr>
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</table>
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<br>
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<br>
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<h3>Usage Notes</h3>
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<ol>
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<li>A process must have the <samp>*iosyscfg</samp> special authority to use the
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<em>sethostname()</em>.<br>
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<br>
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</li>
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<li>Maximum length of host names is defined by [MAXHOSTNAMELEN] (defined in
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<strong><sys/param.h></strong>).<br>
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<br>
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</li>
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<li>The host name can be set in the following two ways (and users should be
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aware of the implications of the way they choose):
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<ul>
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<li>By using option 12 (Change local domain and host names) on the Configure
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TCP/IP (CFGTCP) menu. When option 12 is used to change the local domain name or
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local host name, the system appends the local domain name to the local host
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name and stores the value for access by <em>sethostname()</em> and
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<em>gethostname()</em>.<br>
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<br>
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</li>
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<li>By using the <em>sethostname()</em> function. When <em>sethostname()</em>
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is used to set the host name, the TCP/IP configuration file is not affected.
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Only the field that is accessed by <em>sethostname()</em> and
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<em>gethostname()</em> is changed.</li>
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</ul>
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<br>
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</li>
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<li>The name of the host is set to NULL when the pointer to the host name
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(pointed to by the <em>name</em> parameter) is set to NULL.<br>
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<br>
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</li>
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<li>The host name is assumed to be in the default coded character set
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identifier (CCSID) currently in effect for the job. In addition, the host name
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must adhere to the following conventions.
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<ul>
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<li>The first character must be either an English alphabetic character or a
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numeric character.<br>
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<br>
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</li>
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<li>The last character must be either an English alphabetic character, a
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numeric character, or a period (.).<br>
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<br>
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</li>
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<li>Blanks are not allowed (trailing blanks are removed).<br>
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<br>
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</li>
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<li>The special characters period(.), underscore(_), and minus(-) are
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allowed.<br>
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<br>
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</li>
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<li>Parts of the name separated by periods (.) cannot exceed 63 characters in
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length.
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<p><strong>Note:</strong> Each part of the name separated by periods must begin
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and end with an English alphanumeric character.</p>
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</li>
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<li>Internet address names (in the form nnn.nnn.nnn.nnn (where nnn is a decimal
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number)) are not allowed.<br>
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<br>
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</li>
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<li>Names must be from 1 to 255 characters in length.</li>
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</ul>
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</li>
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</ol>
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<br>
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<h3>Related Information</h3>
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<p><a href="ghostn.htm">gethostname()</a>--Retrieve Host Name</p>
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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> |
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<a href="unix.htm">UNIX-Type APIs</a> |
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<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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