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| <title>The GNU Fortran Compiler: ACCESS</title> |
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| <a name="ACCESS-_002d_002d_002d-Checks-file-access-modes"></a> |
| <h3 class="section">8.4 <code>ACCESS</code> — Checks file access modes</h3> |
| <a name="index-ACCESS"></a> |
| <a name="index-file-system_002c-access-mode"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>ACCESS(NAME, MODE)</code> checks whether the file <var>NAME</var> |
| exists, is readable, writable or executable. Except for the |
| executable check, <code>ACCESS</code> can be replaced by |
| Fortran 95’s <code>INQUIRE</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>GNU extension |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Inquiry function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = ACCESS(NAME, MODE)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>NAME</var></td><td width="70%">Scalar <code>CHARACTER</code> of default kind with the |
| file name. Tailing blank are ignored unless the character <code>achar(0)</code> |
| is present, then all characters up to and excluding <code>achar(0)</code> are |
| used as file name.</td></tr> |
| <tr><td width="15%"><var>MODE</var></td><td width="70%">Scalar <code>CHARACTER</code> of default kind with the |
| file access mode, may be any concatenation of <code>"r"</code> (readable), |
| <code>"w"</code> (writable) and <code>"x"</code> (executable), or <code>" "</code> to check |
| for existence.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>Returns a scalar <code>INTEGER</code>, which is <code>0</code> if the file is |
| accessible in the given mode; otherwise or if an invalid argument |
| has been given for <code>MODE</code> the value <code>1</code> is returned. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program access_test |
| implicit none |
| character(len=*), parameter :: file = 'test.dat' |
| character(len=*), parameter :: file2 = 'test.dat '//achar(0) |
| if(access(file,' ') == 0) print *, trim(file),' is exists' |
| if(access(file,'r') == 0) print *, trim(file),' is readable' |
| if(access(file,'w') == 0) print *, trim(file),' is writable' |
| if(access(file,'x') == 0) print *, trim(file),' is executable' |
| if(access(file2,'rwx') == 0) & |
| print *, trim(file2),' is readable, writable and executable' |
| end program access_test |
| </pre></div> |
| </dd> |
| <dt><em>Specific names</em>:</dt> |
| <dt><em>See also</em>:</dt> |
| </dl> |
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