toolchain/gcc-linaro-6.3.1-2017.02-x8.../share/doc/gfortran/GETENV.html

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Next: <a href="GET_005fENVIRONMENT_005fVARIABLE.html#GET_005fENVIRONMENT_005fVARIABLE" accesskey="n" rel="next">GET_ENVIRONMENT_VARIABLE</a>, Previous: <a href="GETCWD.html#GETCWD" accesskey="p" rel="prev">GETCWD</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="GETENV-_002d_002d_002d-Get-an-environmental-variable"></a>
<h3 class="section">9.117 <code>GETENV</code> &mdash; Get an environmental variable</h3>
<a name="index-GETENV"></a>
<a name="index-environment-variable-2"></a>

<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p>Get the <var>VALUE</var> of the environmental variable <var>NAME</var>.
</p>
<p>This intrinsic routine is provided for backwards compatibility with
GNU Fortran 77.  In new code, programmers should consider the use of
the <a href="GET_005fENVIRONMENT_005fVARIABLE.html#GET_005fENVIRONMENT_005fVARIABLE">GET_ENVIRONMENT_VARIABLE</a> intrinsic defined by the Fortran
2003 standard.
</p>
<p>Note that <code>GETENV</code> need not be thread-safe. It is the
responsibility of the user to ensure that the environment is not being
updated concurrently with a call to the <code>GETENV</code> intrinsic.
</p>
</dd>
<dt><em>Standard</em>:</dt>
<dd><p>GNU extension
</p>
</dd>
<dt><em>Class</em>:</dt>
<dd><p>Subroutine
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>CALL GETENV(NAME, VALUE)</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>NAME</var></td><td width="70%">Shall be of type <code>CHARACTER</code> and of default kind.</td></tr>
<tr><td width="15%"><var>VALUE</var></td><td width="70%">Shall be of type <code>CHARACTER</code> and of default kind.</td></tr>
</table>

</dd>
<dt><em>Return value</em>:</dt>
<dd><p>Stores the value of <var>NAME</var> in <var>VALUE</var>. If <var>VALUE</var> is
not large enough to hold the data, it is truncated. If <var>NAME</var>
is not set, <var>VALUE</var> will be filled with blanks.
</p>
</dd>
<dt><em>Example</em>:</dt>
<dd><div class="smallexample">
<pre class="smallexample">PROGRAM test_getenv
  CHARACTER(len=255) :: homedir
  CALL getenv(&quot;HOME&quot;, homedir)
  WRITE (*,*) TRIM(homedir)
END PROGRAM
</pre></div>

</dd>
<dt><em>See also</em>:</dt>
<dd><p><a href="GET_005fENVIRONMENT_005fVARIABLE.html#GET_005fENVIRONMENT_005fVARIABLE">GET_ENVIRONMENT_VARIABLE</a>
</p></dd>
</dl>


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