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<title>The GNU Fortran Compiler: ACCESS</title>
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<a name="ACCESS"></a>
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<p>
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Next: <a href="ACHAR.html#ACHAR" accesskey="n" rel="next">ACHAR</a>, Previous: <a href="ABS.html#ABS" accesskey="p" rel="prev">ABS</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<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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<hr>
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<a name="ACCESS-_002d_002d_002d-Checks-file-access-modes"></a>
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<h3 class="section">9.4 <code>ACCESS</code> — Checks file access modes</h3>
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<a name="index-ACCESS"></a>
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<a name="index-file-system_002c-access-mode"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>ACCESS(NAME, MODE)</code> checks whether the file <var>NAME</var>
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exists, is readable, writable or executable. Except for the
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executable check, <code>ACCESS</code> can be replaced by
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Fortran 95’s <code>INQUIRE</code>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>GNU extension
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Inquiry function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>RESULT = ACCESS(NAME, MODE)</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>NAME</var></td><td width="70%">Scalar <code>CHARACTER</code> of default kind with the
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file name. Tailing blank are ignored unless the character <code>achar(0)</code>
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is present, then all characters up to and excluding <code>achar(0)</code> are
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used as file name.</td></tr>
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<tr><td width="15%"><var>MODE</var></td><td width="70%">Scalar <code>CHARACTER</code> of default kind with the
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file access mode, may be any concatenation of <code>"r"</code> (readable),
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<code>"w"</code> (writable) and <code>"x"</code> (executable), or <code>" "</code> to check
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for existence.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>Returns a scalar <code>INTEGER</code>, which is <code>0</code> if the file is
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accessible in the given mode; otherwise or if an invalid argument
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has been given for <code>MODE</code> the value <code>1</code> is returned.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program access_test
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implicit none
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character(len=*), parameter :: file = 'test.dat'
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character(len=*), parameter :: file2 = 'test.dat '//achar(0)
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if(access(file,' ') == 0) print *, trim(file),' is exists'
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if(access(file,'r') == 0) print *, trim(file),' is readable'
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if(access(file,'w') == 0) print *, trim(file),' is writable'
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if(access(file,'x') == 0) print *, trim(file),' is executable'
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if(access(file2,'rwx') == 0) &
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print *, trim(file2),' is readable, writable and executable'
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end program access_test
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</pre></div>
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</dd>
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<dt><em>Specific names</em>:</dt>
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<dt><em>See also</em>:</dt>
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</dl>
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