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 <h3 class="section">2.24 <code>mallinfo</code>, <code>malloc_stats</code>, <code>mallopt</code>&mdash;malloc support</h3>

 <p><a name="index-mallinfo-49"></a><a name="index-malloc_005fstats-50"></a><a name="index-mallopt-51"></a><a name="index-g_t_005fmallinfo_005fr-52"></a><a name="index-g_t_005fmalloc_005fstats_005fr-53"></a><a name="index-g_t_005fmallopt_005fr-54"></a><strong>Synopsis</strong>
 <pre class="example">     #include &lt;malloc.h&gt;
      struct mallinfo mallinfo(void);
      void malloc_stats(void);
      int mallopt(int <var>parameter</var>, <var>value</var>);

      struct mallinfo _mallinfo_r(void *<var>reent</var>);
      void _malloc_stats_r(void *<var>reent</var>);
      int _mallopt_r(void *<var>reent</var>, int <var>parameter</var>, <var>value</var>);

 </pre>
    <p><strong>Description</strong><br>
 <code>mallinfo</code> returns a structure describing the current state of
 memory allocation.  The structure is defined in malloc.h.  The
 following fields are defined: <code>arena</code> is the total amount of space
 in the heap; <code>ordblks</code> is the number of chunks which are not in use;
 <code>uordblks</code> is the total amount of space allocated by <code>malloc</code>;
 <code>fordblks</code> is the total amount of space not in use; <code>keepcost</code> is
 the size of the top most memory block.

    <p><code>malloc_stats</code> print some statistics about memory allocation on
 standard error.

    <p><code>mallopt</code> takes a parameter and a value.  The parameters are defined
 in malloc.h, and may be one of the following: <code>M_TRIM_THRESHOLD</code>
 sets the maximum amount of unused space in the top most block before
 releasing it back to the system in <code>free</code> (the space is released by
 calling <code>_sbrk_r</code> with a negative argument); <code>M_TOP_PAD</code> is the
 amount of padding to allocate whenever <code>_sbrk_r</code> is called to
 allocate more space.

    <p>The alternate functions <code>_mallinfo_r</code>, <code>_malloc_stats_r</code>, and
 <code>_mallopt_r</code> are reentrant versions.  The extra argument <var>reent</var>
 is a pointer to a reentrancy structure.

    <p><br>
 <strong>Returns</strong><br>
 <code>mallinfo</code> returns a mallinfo structure.  The structure is defined
 in malloc.h.

    <p><code>malloc_stats</code> does not return a result.

    <p><code>mallopt</code> returns zero if the parameter could not be set, or
 non-zero if it could be set.

    <p><br>
 <strong>Portability</strong><br>
 <code>mallinfo</code> and <code>mallopt</code> are provided by SVR4, but <code>mallopt</code>
 takes different parameters on different systems.  <code>malloc_stats</code> is
 not portable.

    <p><br>

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	<h3 class="section">2.24 <code>mallinfo</code>, <code>malloc_stats</code>, <code>mallopt</code>—malloc support</h3>

	<p><a name="index-mallinfo-49"></a><a name="index-malloc_005fstats-50"></a><a name="index-mallopt-51"></a><a name="index-g_t_005fmallinfo_005fr-52"></a><a name="index-g_t_005fmalloc_005fstats_005fr-53"></a><a name="index-g_t_005fmallopt_005fr-54"></a><strong>Synopsis</strong>
	<pre class="example"> #include <malloc.h>
	struct mallinfo mallinfo(void);
	void malloc_stats(void);
	int mallopt(int <var>parameter</var>, <var>value</var>);

	struct mallinfo _mallinfo_r(void *<var>reent</var>);
	void _malloc_stats_r(void *<var>reent</var>);
	int _mallopt_r(void *<var>reent</var>, int <var>parameter</var>, <var>value</var>);

	</pre>
	<p><strong>Description</strong><br>
	<code>mallinfo</code> returns a structure describing the current state of
	memory allocation. The structure is defined in malloc.h. The
	following fields are defined: <code>arena</code> is the total amount of space
	in the heap; <code>ordblks</code> is the number of chunks which are not in use;
	<code>uordblks</code> is the total amount of space allocated by <code>malloc</code>;
	<code>fordblks</code> is the total amount of space not in use; <code>keepcost</code> is
	the size of the top most memory block.

	<p><code>malloc_stats</code> print some statistics about memory allocation on
	standard error.

	<p><code>mallopt</code> takes a parameter and a value. The parameters are defined
	in malloc.h, and may be one of the following: <code>M_TRIM_THRESHOLD</code>
	sets the maximum amount of unused space in the top most block before
	releasing it back to the system in <code>free</code> (the space is released by
	calling <code>_sbrk_r</code> with a negative argument); <code>M_TOP_PAD</code> is the
	amount of padding to allocate whenever <code>_sbrk_r</code> is called to
	allocate more space.

	<p>The alternate functions <code>_mallinfo_r</code>, <code>_malloc_stats_r</code>, and
	<code>_mallopt_r</code> are reentrant versions. The extra argument <var>reent</var>
	is a pointer to a reentrancy structure.

	<p><br>
	<strong>Returns</strong><br>
	<code>mallinfo</code> returns a mallinfo structure. The structure is defined
	in malloc.h.

	<p><code>malloc_stats</code> does not return a result.

	<p><code>mallopt</code> returns zero if the parameter could not be set, or
	non-zero if it could be set.

	<p><br>
	<strong>Portability</strong><br>
	<code>mallinfo</code> and <code>mallopt</code> are provided by SVR4, but <code>mallopt</code>
	takes different parameters on different systems. <code>malloc_stats</code> is
	not portable.

	<p><br>

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