226 lines
6.3 KiB
HTML
226 lines
6.3 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>Qp0zDltSysEnv()--Delete a System-Level Environment Variable</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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<!-- at RCHVMW2 on 17 Feb 1999 at 11:05:09 -->
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<!-- This file has undergone html cleanup on 04/29/02 by JET -->
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<!-- End Header Records -->
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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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<!-- Java sync-link -->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>Qp0zDltSysEnv()--Delete a System-Level Environment Variable</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax
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<pre>
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#include <qp0z1170.h>
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int Qp0zDltSysEnv(const char <em>*name</em>, void <em>*reserved</em>);
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</pre>
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Service Program Name: QP0ZSYSE<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 <strong>Qp0zDltSysEnv()</strong> function deletes a single system-level
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environment variable or deletes all system-level environment variables. If the
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<em>name</em> parameter is NULL, all system-level environment variables are
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deleted.</p>
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<p>The <em>name</em> parameter does not include the equal (=) symbol or the
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<samp>value</samp> part of the environment variable <samp>name=value</samp>
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pair.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong><em>name</em></strong></dt>
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<dd>(Input) The name of the environment variable to delete.<br>
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</dd>
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<dt><strong><em>reserved</em></strong></dt>
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<dd>(Input) Reserved for future use. Currently, the only value allowed is
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NULL.</dd>
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</dl>
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<br>
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<h3>Authorities</h3>
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<p>*JOBCTL special authority is required to delete a system-level environment
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variable.</p>
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<br>
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<h3>Return Value</h3>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top"><strong>Qp0zDltSysEnv()</strong> was
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successful.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>errval</em></td>
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<td align="left" valign="top"><strong>Qp0zDltSysEnv()</strong> was not
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successful. <em>errval</em> is set to indicate the error.</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 Conditions</h3>
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<p>If <strong>Qp0zDltSysEnv()</strong> is not successful, <em>errval</em>
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indicates one of the following errors.</p>
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<dl compact>
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<dt><em>[EFAULT]</em></dt>
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<dd>
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<p>The address used for an argument is not correct.</p>
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<p>In attempting to use an argument in a call, the system detected an address
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that is not valid.</p>
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<p>While attempting to access a parameter passed to this function, the system
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detected an address that is not valid.</p>
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</dd>
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<dt><em>[EINVAL]</em></dt>
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<dd>
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<p>The value specified for the argument is not correct.</p>
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<p>A function was passed incorrect argument values, or an operation was
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attempted on an object and the operation specified is not supported for that
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type of object.</p>
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<p>An argument value is not valid, out of range, or NULL.</p>
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<p>The value for the <em>reserved</em> parameter was not NULL.</p>
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</dd>
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<dt><em>[ENOENT]</em></dt>
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<dd>
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<p>No such path or directory.</p>
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<p>The directory or a component of the path name specified does not exist.</p>
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<p>A named file or directory does not exist or is an empty string.</p>
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<p>The parameter <samp>name</samp> is not NULL and does not point to an
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environment variable name that currently exists in the environment list.</p>
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</dd>
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<dt><em>[EPERM]</em></dt>
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<dd>
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<p>Operation not permitted.</p>
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<p>You must have appropriate privileges or be the owner of the object or other
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resource to do the requested operation.</p>
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<p>You must have *JOBCTL special authority to delete a system-level environment
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variable.</p>
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</dd>
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<dt><em>[EUNKNOWN]</em></dt>
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<dd>
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<p>Unknown system state.</p>
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<p>The operation failed because of an unknown system state. See any messages in
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the job log and correct any errors that are indicated, then retry the
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operation.</p>
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</dd>
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</dl>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>qp0z1170.h</strong>> file (see <a href="unix13.htm">
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Header Files for UNIX-Type Functions</a>)</li>
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<li><a href="evgetenv.htm">getenv()</a>--Get Value of Environment Variable</li>
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<li><a href="evputenv.htm">putenv()</a>--Change or Add Environment
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Variable</li>
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<li><a href="evdltenv.htm">Qp0zDltEnv()</a>--Delete an Environment
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Variable</li>
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<li><a href="evgetall.htm">Qp0zGetAllSysEnv()</a>--Get All System-Level
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Environment Variables</li>
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<li><a href="evgenvxt.htm">Qp0zGetEnv()</a>--Get Value of Environment Variable
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(Extended)</li>
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<li><a href="evgetsev.htm">Qp0zGetSysEnv()</a>--Get Value of System-Level
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Environment Variable</li>
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<li><a href="evinenv.htm">Qp0zInitEnv()</a>--Initialize Environment for
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Variables</li>
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<li><a href="evpenvxt.htm">Qp0zPutEnv()</a>--Change or Add Environment Variable
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(Extended)</li>
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<li><a href="evputsev.htm">Qp0zPutSysEnv()</a>--Change or Add a System-Level
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Environment</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>See the example of using <strong>Qp0zDltSysEnv()</strong> in <a href=
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"evputsev.htm">Qp0zPutSysEnv()</a>--Change or Add a System-Level
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Environment.</p>
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<br>
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<hr>
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API introduced: V4R4
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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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