252 lines
7.6 KiB
HTML
252 lines
7.6 KiB
HTML
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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>Qp0zPutEnv()--Change or Add Environment Variable (Extended)</title>
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</head>
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<body>
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</script>
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<a name="Top_Of_Page"></a>
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<h2>Qp0zPutEnv()--Change or Add Environment Variable (Extended)</h2>
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<div class="box" style="width: 60%;">
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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 Qp0zPutEnv(const char <em>*string</em>, int <em>ccsid</em>);;
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</pre>
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Service Program Name: QP0ZCPA<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. See Usage Notes for more information.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>Qp0zPutEnv()</strong> function is an i5/OS extension to the
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standard <strong>putenv()</strong> function. <strong>Qp0zPutEnv()</strong> sets
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the value of an environment variable by altering an existing variable or
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creating a new variable. In addition, it specifies a CCSID (coded character set
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identifier) to be associated with the environment variable.</p>
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<p>The <em>string</em> parameter points to a string of the form <samp>
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name=value</samp>, where <samp>name</samp> is the environment variable and
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<samp>value</samp> is the new value for it.</p>
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<p>The <samp>name</samp> cannot contain a blank. For example,</p>
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<pre>
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PATH NAME=/my_lib/joe_user
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</pre>
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<p>is not valid because of the blank between <samp>PATH</samp> and <samp>
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NAME</samp>. The name can contain an equal (=) symbol, but the system
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interprets all characters following the first equal symbol as being the value
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of the environment variable. For example,</p>
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<pre>
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PATH=NAME=/my_lib/joe_user
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</pre>
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<p>will result in a value of 'NAME=/my_lib/joe_user' for the variable PATH.</p>
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<br>
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<!-- Please NOTE: DO NOT DELETE THIS SECTION if this API has no authorities and locks. -->
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<!-- Instead, use the commented out coding below to indicate NONE. -->
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<h3>Authorities and Locks</h3>
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<!-- Use this if there are no authorities and locks. -->
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<p>None.</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>string</em></strong></dt>
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<dd>(Input) A pointer to the <samp>name=value</samp> string.<br>
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</dd>
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<dt><strong><em>ccsid</em></strong></dt>
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<dd>(Input) A CCSID to be associated with this environment variable. If 0 is
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specified, the default CCSID for the job is used.</dd>
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</dl>
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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>Qp0zInitEnv()</strong> successfully
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initialized the environment.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-1</em></td>
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<td align="left" valign="top"><strong>Qp0zInitEnv()</strong> was not
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successful. The <em>errno</em> variable 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>Qp0zPutEnv()</strong> is not successful, <em>errno</em> indicates
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one of the following errors.</p>
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<dl compact>
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<dt><em>[EDAMAGE]</em></dt>
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<dd>
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<p>A damaged object was encountered.</p>
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<p>A referenced object is damaged. The object cannot be used.</p>
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</dd>
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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. For example, the
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string may not be in the correct format.</p>
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</dd>
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<dt><em>[ENOMEM]</em></dt>
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<dd>
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<p>Storage allocation request failed.</p>
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<p>A function needed to allocate storage, but no storage is available.</p>
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<p>There is not enough memory to perform the requested function. (There is a
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limit of 4095 environment variables per job.)</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>Usage Notes</h3>
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<ol>
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<li>Although <strong>Qp0zPutEnv()</strong> is threadsafe, if a thread calls an
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environment variable function while another thread is accessing an environment
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variable from the environ array the thread may see undefined results. The
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environ array can be accessed directly or by using a pointer returned from the
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<strong>getenv()</strong> or <strong>Qp0zGetEnv()</strong> functions. The
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environment contents are only protected during calls to the environment
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variable functions.<br>
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</li>
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<li>No translation is done based on the CCSID. The CCSID is just stored and
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retrieved as an integer value associated with each environment variable.</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>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="evdltsev.htm">Qp0zDltSysEnv()</a>--Delete a System-Level
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Environment 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="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="evputsev.htm">Qp0zPutSysEnv()</a>--Change or Add a System-Level
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Environment Variable</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>putenv()</strong> in <a href=
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"evpenvxt.htm">putenv()</a>--Change or Add Environment Variable.</p>
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<br>
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<hr>
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API introduced: V3R6
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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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