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<a name="calloc_002d_002d_002dallocate-space-for-arrays"></a>
<h3 class="section">2.11 <code>calloc</code>&mdash;allocate space for arrays</h3>
<a name="index-calloc"></a>
<a name="index-_005fcalloc_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;stdlib.h&gt;
void *calloc(size_t <var>n</var>, size_t <var>s</var>);
void *_calloc_r(void *<var>reent</var>, size_t <var>n</var>, size_t <var>s</var>);

</pre></div>
<p><strong>Description</strong><br>
Use <code>calloc</code> to request a block of memory sufficient to hold an
array of <var>n</var> elements, each of which has size <var>s</var>.
</p>
<p>The memory allocated by <code>calloc</code> comes out of the same memory pool
used by <code>malloc</code>, but the memory block is initialized to all zero
bytes.  (To avoid the overhead of initializing the space, use
<code>malloc</code> instead.)
</p>
<p>The alternate function <code>_calloc_r</code> is reentrant.
The extra argument <var>reent</var> is a pointer to a reentrancy structure.
</p>
<br>
<p><strong>Returns</strong><br>
If successful, a pointer to the newly allocated space.
</p>
<p>If unsuccessful, <code>NULL</code>.
</p>
<br>
<p><strong>Portability</strong><br>
<code>calloc</code> is ANSI.
</p>
<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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