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100 lines
3.9 KiB
HTML
100 lines
3.9 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>calloc (The Red Hat newlib C Library)</title>
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<meta name="description" content="calloc (The Red Hat newlib C Library)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdlib.html#Stdlib" rel="up" title="Stdlib">
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</head>
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<body lang="en">
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<a name="calloc"></a>
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<div class="header">
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<p>
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Next: <a href="div.html#div" accesskey="n" rel="next">div</a>, Previous: <a href="bsearch.html#bsearch" accesskey="p" rel="prev">bsearch</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="calloc_002d_002d_002dallocate-space-for-arrays"></a>
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<h3 class="section">2.11 <code>calloc</code>—allocate space for arrays</h3>
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<a name="index-calloc"></a>
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<a name="index-_005fcalloc_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdlib.h>
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void *calloc(size_t <var>n</var>, size_t <var>s</var>);
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void *_calloc_r(void *<var>reent</var>, size_t <var>n</var>, size_t <var>s</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Use <code>calloc</code> to request a block of memory sufficient to hold an
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array of <var>n</var> elements, each of which has size <var>s</var>.
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</p>
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<p>The memory allocated by <code>calloc</code> comes out of the same memory pool
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used by <code>malloc</code>, but the memory block is initialized to all zero
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bytes. (To avoid the overhead of initializing the space, use
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<code>malloc</code> instead.)
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</p>
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<p>The alternate function <code>_calloc_r</code> is reentrant.
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The extra argument <var>reent</var> is a pointer to a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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If successful, a pointer to the newly allocated space.
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</p>
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<p>If unsuccessful, <code>NULL</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>calloc</code> is ANSI.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<br>
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