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| <h3 class="section">2.11 <code>calloc</code>—allocate space for arrays</h3> |
| |
| <p><a name="index-calloc-17"></a><a name="index-g_t_005fcalloc_005fr-18"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdlib.h> |
| 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> |
| <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>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>The alternate function <code>_calloc_r</code> is reentrant. |
| The extra argument <var>reent</var> is a pointer to a reentrancy structure. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| If successful, a pointer to the newly allocated space. |
| |
| <p>If unsuccessful, <code>NULL</code>. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>calloc</code> is ANSI. |
| |
| <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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