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<a name="stdio_005fext_002c_005f_005ffbufsize_002c_005f_005ffpending_002c_005f_005fflbf_002c_005f_005ffreadable_002c_005f_005ffwritable_002c_005f_005ffreading_002c_005f_005ffwriting_002d_002d_002daccess-internals-of-FILE-structure"></a>
<h3 class="section">4.63 <code>stdio_ext</code>,<code>__fbufsize</code>,<code>__fpending</code>,<code>__flbf</code>,<code>__freadable</code>,<code>__fwritable</code>,<code>__freading</code>,<code>__fwriting</code>&mdash;access internals of FILE structure</h3>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdio.h&gt;
#include &lt;stdio_ext.h&gt;
size_t __fbufsize(FILE *<var>fp</var>);
size_t __fpending(FILE *<var>fp</var>);
int __flbf(FILE *<var>fp</var>);
int __freadable(FILE *<var>fp</var>);
int __fwritable(FILE *<var>fp</var>);
int __freading(FILE *<var>fp</var>);
int __fwriting(FILE *<var>fp</var>);

</pre></div>
<p><strong>Description</strong><br>
These functions provides access to the internals of the FILE structure <var>fp</var>.
</p>
<br>
<p><strong>Returns</strong><br>
<code>__fbufsize</code> returns the number of bytes in the buffer of stream <var>fp</var>.
</p>
<p><code>__fpending</code> returns the number of bytes in the output buffer of stream <var>fp</var>.
</p>
<p><code>__flbf</code> returns nonzero if stream <var>fp</var> is line-buffered, and <code>0</code> if not.
</p>
<p><code>__freadable</code> returns nonzero if stream <var>fp</var> may be read, and <code>0</code> if not.
</p>
<p><code>__fwritable</code> returns nonzero if stream <var>fp</var> may be written, and <code>0</code> if not.
</p>
<p><code>__freading</code> returns nonzero if stream <var>fp</var> if the last operation on
it was a read, or if it read-only, and <code>0</code> if not.
</p>
<p><code>__fwriting</code> returns nonzero if stream <var>fp</var> if the last operation on
it was a write, or if it write-only, and <code>0</code> if not.
</p>
<br>
<p><strong>Portability</strong><br>
These functions originate from Solaris and are also provided by GNU libc.
</p>
<p>No supporting OS subroutines are required.
</p>
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