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| <a name="GET_005fENVIRONMENT_005fVARIABLE-_002d_002d_002d-Get-an-environmental-variable"></a> |
| <h3 class="section">8.103 <code>GET_ENVIRONMENT_VARIABLE</code> — Get an environmental variable</h3> |
| <a name="index-GET_005fENVIRONMENT_005fVARIABLE"></a> |
| <a name="index-environment-variable-3"></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>Note that <code>GET_ENVIRONMENT_VARIABLE</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>GET_ENVIRONMENT_VARIABLE</code> intrinsic. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2003 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Subroutine |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>CALL GET_ENVIRONMENT_VARIABLE(NAME[, VALUE, LENGTH, STATUS, TRIM_NAME)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>NAME</var></td><td width="70%">Shall be a scalar of type <code>CHARACTER</code> |
| and of default kind.</td></tr> |
| <tr><td width="15%"><var>VALUE</var></td><td width="70%">(Optional) Shall be a scalar of type <code>CHARACTER</code> |
| and of default kind.</td></tr> |
| <tr><td width="15%"><var>LENGTH</var></td><td width="70%">(Optional) Shall be a scalar of type <code>INTEGER</code> |
| and of default kind.</td></tr> |
| <tr><td width="15%"><var>STATUS</var></td><td width="70%">(Optional) Shall be a scalar of type <code>INTEGER</code> |
| and of default kind.</td></tr> |
| <tr><td width="15%"><var>TRIM_NAME</var></td><td width="70%">(Optional) Shall be a scalar of type <code>LOGICAL</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. Argument <var>LENGTH</var> |
| contains the length needed for storing the environment variable <var>NAME</var> |
| or zero if it is not present. <var>STATUS</var> is -1 if <var>VALUE</var> is present |
| but too short for the environment variable; it is 1 if the environment |
| variable does not exist and 2 if the processor does not support environment |
| variables; in all other cases <var>STATUS</var> is zero. If <var>TRIM_NAME</var> is |
| present with the value <code>.FALSE.</code>, the trailing blanks in <var>NAME</var> |
| are significant; otherwise they are not part of the environment variable |
| name. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">PROGRAM test_getenv |
| CHARACTER(len=255) :: homedir |
| CALL get_environment_variable("HOME", homedir) |
| WRITE (*,*) TRIM(homedir) |
| END PROGRAM |
| </pre></div> |
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