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<title>Qp0zDltSysEnv()--Delete a System-Level Environment Variable</title>
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<h2>Qp0zDltSysEnv()--Delete a System-Level Environment Variable</h2>

<div class="box" style="width: 70%;">
<br>
&nbsp;&nbsp;Syntax 

<pre>
 #include &lt;qp0z1170.h&gt;

 int Qp0zDltSysEnv(const char <em>*name</em>, void  <em>*reserved</em>);  
</pre>

&nbsp;&nbsp;Service Program Name: QP0ZSYSE<br>
<!-- iddvc RMBR -->
<br>
&nbsp;&nbsp;Default Public Authority: *USE<br>
<!-- iddvc RMBR -->
<br>
&nbsp;&nbsp;Threadsafe: Yes<br>
<!-- iddvc RMBR -->
<br>
</div>

<p>The <strong>Qp0zDltSysEnv()</strong> function deletes a single system-level
environment variable or deletes all system-level environment variables. If the
<em>name</em> parameter is NULL, all system-level environment variables are
deleted.</p>

<p>The <em>name</em> parameter does not include the equal (=) symbol or the
<samp>value</samp> part of the environment variable <samp>name=value</samp>
pair.</p>

<br>
<h3>Parameters</h3>

<dl>
<dt><strong><em>name</em></strong></dt>

<dd>(Input) The name of the environment variable to delete.<br>
</dd>

<dt><strong><em>reserved</em></strong></dt>

<dd>(Input) Reserved for future use. Currently, the only value allowed is
NULL.</dd>
</dl>

<br>
<h3>Authorities</h3>

<p>*JOBCTL special authority is required to delete a system-level environment
variable.</p>

<br>
<h3>Return Value</h3>

<table cellpadding="5">
<!-- cols="5 95" -->
<tr>
<td align="left" valign="top"><em>0</em></td>
<td align="left" valign="top"><strong>Qp0zDltSysEnv()</strong> was
successful.</td>
</tr>

<tr>
<td align="left" valign="top"><em>errval</em></td>
<td align="left" valign="top"><strong>Qp0zDltSysEnv()</strong> was not
successful. <em>errval</em> is set to indicate the error.</td>
</tr>
</table>

<br>
 <br>
<h3>Error Conditions</h3>

<p>If <strong>Qp0zDltSysEnv()</strong> is not successful, <em>errval</em>
indicates one of the following errors.</p>

<dl compact>
<dt><em>[EFAULT]</em></dt>

<dd>
<p>The address used for an argument is not correct.</p>

<p>In attempting to use an argument in a call, the system detected an address
that is not valid.</p>

<p>While attempting to access a parameter passed to this function, the system
detected an address that is not valid.</p>
</dd>

<dt><em>[EINVAL]</em></dt>

<dd>
<p>The value specified for the argument is not correct.</p>

<p>A function was passed incorrect argument values, or an operation was
attempted on an object and the operation specified is not supported for that
type of object.</p>

<p>An argument value is not valid, out of range, or NULL.</p>

<p>The value for the <em>reserved</em> parameter was not NULL.</p>
</dd>

<dt><em>[ENOENT]</em></dt>

<dd>
<p>No such path or directory.</p>

<p>The directory or a component of the path name specified does not exist.</p>

<p>A named file or directory does not exist or is an empty string.</p>

<p>The parameter <samp>name</samp> is not NULL and does not point to an
environment variable name that currently exists in the environment list.</p>
</dd>

<dt><em>[EPERM]</em></dt>

<dd>
<p>Operation not permitted.</p>

<p>You must have appropriate privileges or be the owner of the object or other
resource to do the requested operation.</p>

<p>You must have *JOBCTL special authority to delete a system-level environment
variable.</p>
</dd>

<dt><em>[EUNKNOWN]</em></dt>

<dd>
<p>Unknown system state.</p>

<p>The operation failed because of an unknown system state. See any messages in
the job log and correct any errors that are indicated, then retry the
operation.</p>
</dd>
</dl>

<br>
<h3>Related Information</h3>

<ul>
<li>The &lt;<strong>qp0z1170.h</strong>&gt; file (see <a href="unix13.htm">
Header Files for UNIX-Type Functions</a>)</li>

<li><a href="evgetenv.htm">getenv()</a>--Get Value of Environment Variable</li>

<li><a href="evputenv.htm">putenv()</a>--Change or Add Environment
Variable</li>

<li><a href="evdltenv.htm">Qp0zDltEnv()</a>--Delete an Environment
Variable</li>

<li><a href="evgetall.htm">Qp0zGetAllSysEnv()</a>--Get All System-Level
Environment Variables</li>

<li><a href="evgenvxt.htm">Qp0zGetEnv()</a>--Get Value of Environment Variable
(Extended)</li>

<li><a href="evgetsev.htm">Qp0zGetSysEnv()</a>--Get Value of System-Level
Environment Variable</li>

<li><a href="evinenv.htm">Qp0zInitEnv()</a>--Initialize Environment for
Variables</li>

<li><a href="evpenvxt.htm">Qp0zPutEnv()</a>--Change or Add Environment Variable
(Extended)</li>

<li><a href="evputsev.htm">Qp0zPutSysEnv()</a>--Change or Add a System-Level
Environment</li>
</ul>

<br>
<h3>Example</h3>
<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a> 
for information pertaining to code examples.</p>
<p>See the example of using <strong>Qp0zDltSysEnv()</strong> in <a href= 
"evputsev.htm">Qp0zPutSysEnv()</a>--Change or Add a System-Level
Environment.</p>

<br>
<hr>
API introduced: V4R4 

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