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<div class="title">MMAP (Memory Map) Routines<div class="ingroups"><a class="el" href="group___a_p_r.html">Apache Portability Runtime library</a></div></div> </div>
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Collaboration diagram for MMAP (Memory Map) Routines:</div>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:gac231fdf15d2d29802e0abbc5d0cf25b8"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#gac231fdf15d2d29802e0abbc5d0cf25b8">APR_MMAP_READ</a>   1</td></tr>
<tr class="separator:gac231fdf15d2d29802e0abbc5d0cf25b8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac2eb7f697d8bf190e630b85f967c8273"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#gac2eb7f697d8bf190e630b85f967c8273">APR_MMAP_WRITE</a>   2</td></tr>
<tr class="separator:gac2eb7f697d8bf190e630b85f967c8273"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga19d1916e7b64bfb1a969648fe7b0846a"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga19d1916e7b64bfb1a969648fe7b0846a">APR_MMAP_THRESHOLD</a>   1</td></tr>
<tr class="separator:ga19d1916e7b64bfb1a969648fe7b0846a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga548e49b3c9e8265ad8ccf70994f4fe25"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga548e49b3c9e8265ad8ccf70994f4fe25">APR_MMAP_LIMIT</a>   (4*1024*1024)</td></tr>
<tr class="separator:ga548e49b3c9e8265ad8ccf70994f4fe25"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4f469432098e986567576fd4c4ce5adc"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga4f469432098e986567576fd4c4ce5adc">APR_MMAP_CANDIDATE</a>(filelength)   ((filelength >= <a class="el" href="group__apr__mmap.html#ga19d1916e7b64bfb1a969648fe7b0846a">APR_MMAP_THRESHOLD</a>) && (filelength < <a class="el" href="group__apr__mmap.html#ga548e49b3c9e8265ad8ccf70994f4fe25">APR_MMAP_LIMIT</a>))</td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:ga766b01a3e1e0438d06dc88d76f826f80"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga766b01a3e1e0438d06dc88d76f826f80">apr_mmap_t</a></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gac6b103139be2e859741ec94cc6ad34cc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#gac6b103139be2e859741ec94cc6ad34cc">apr_mmap_create</a> (<a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> **newmmap, <a class="el" href="group__apr__file__io.html#gaa46e4763ac375ea3c7a43ba6f6099e22">apr_file_t</a> *file, apr_off_t offset, apr_size_t size, apr_int32_t flag, <a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *cntxt)</td></tr>
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<tr class="memitem:ga9fcdbf8090e924a4e8f2b301519bb4c8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga9fcdbf8090e924a4e8f2b301519bb4c8">apr_mmap_dup</a> (<a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> **new_mmap, <a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> *old_mmap, <a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p)</td></tr>
<tr class="separator:ga9fcdbf8090e924a4e8f2b301519bb4c8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4b67a2d22a07707897cc1183a1682040"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga4b67a2d22a07707897cc1183a1682040">apr_mmap_delete</a> (<a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> *mm)</td></tr>
<tr class="separator:ga4b67a2d22a07707897cc1183a1682040"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga4c1d31bd9e911744bd5edb97e17210ec"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__mmap.html#ga4c1d31bd9e911744bd5edb97e17210ec">apr_mmap_offset</a> (void **addr, <a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> *mm, apr_off_t offset)</td></tr>
<tr class="separator:ga4c1d31bd9e911744bd5edb97e17210ec"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ga4f469432098e986567576fd4c4ce5adc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga4f469432098e986567576fd4c4ce5adc">◆ </a></span>APR_MMAP_CANDIDATE</h2>
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<td class="memname">#define APR_MMAP_CANDIDATE</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">filelength</td><td>)</td>
<td>   ((filelength >= <a class="el" href="group__apr__mmap.html#ga19d1916e7b64bfb1a969648fe7b0846a">APR_MMAP_THRESHOLD</a>) && (filelength < <a class="el" href="group__apr__mmap.html#ga548e49b3c9e8265ad8ccf70994f4fe25">APR_MMAP_LIMIT</a>))</td>
</tr>
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</div><div class="memdoc">
<p>Can this file be MMaped </p>
</div>
</div>
<a id="ga548e49b3c9e8265ad8ccf70994f4fe25"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga548e49b3c9e8265ad8ccf70994f4fe25">◆ </a></span>APR_MMAP_LIMIT</h2>
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<td class="memname">#define APR_MMAP_LIMIT   (4*1024*1024)</td>
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</div><div class="memdoc">
<p>Maximum size of MMap region </p>
</div>
</div>
<a id="gac231fdf15d2d29802e0abbc5d0cf25b8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gac231fdf15d2d29802e0abbc5d0cf25b8">◆ </a></span>APR_MMAP_READ</h2>
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<td class="memname">#define APR_MMAP_READ   1</td>
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</table>
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<p>MMap opened for reading </p>
</div>
</div>
<a id="ga19d1916e7b64bfb1a969648fe7b0846a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga19d1916e7b64bfb1a969648fe7b0846a">◆ </a></span>APR_MMAP_THRESHOLD</h2>
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<td class="memname">#define APR_MMAP_THRESHOLD   1</td>
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<p>Files have to be at least this big before they're mmap()d. This is to deal with systems where the expense of doing an mmap() and an munmap() outweighs the benefit for small files. It shouldn't be set lower than 1. </p>
</div>
</div>
<a id="gac2eb7f697d8bf190e630b85f967c8273"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gac2eb7f697d8bf190e630b85f967c8273">◆ </a></span>APR_MMAP_WRITE</h2>
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<td class="memname">#define APR_MMAP_WRITE   2</td>
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<p>MMap opened for writing </p>
</div>
</div>
<h2 class="groupheader">Typedef Documentation</h2>
<a id="ga766b01a3e1e0438d06dc88d76f826f80"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga766b01a3e1e0438d06dc88d76f826f80">◆ </a></span>apr_mmap_t</h2>
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<td class="memname">typedef struct <a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> <a class="el" href="structapr__mmap__t.html">apr_mmap_t</a></td>
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</div><div class="memdoc">
<dl class="section see"><dt>See also</dt><dd><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> </dd></dl>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="gac6b103139be2e859741ec94cc6ad34cc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gac6b103139be2e859741ec94cc6ad34cc">◆ </a></span>apr_mmap_create()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_mmap_create </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> ** </td>
<td class="paramname"><em>newmmap</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__apr__file__io.html#gaa46e4763ac375ea3c7a43ba6f6099e22">apr_file_t</a> * </td>
<td class="paramname"><em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_off_t </td>
<td class="paramname"><em>offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_int32_t </td>
<td class="paramname"><em>flag</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"><em>cntxt</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<p>Create a new mmap'ed file out of an existing APR file. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">newmmap</td><td>The newly created mmap'ed file. </td></tr>
<tr><td class="paramname">file</td><td>The file to turn into an mmap. </td></tr>
<tr><td class="paramname">offset</td><td>The offset into the file to start the data pointer at. </td></tr>
<tr><td class="paramname">size</td><td>The size of the file </td></tr>
<tr><td class="paramname">flag</td><td>bit-wise or of: <pre>
APR_MMAP_READ MMap opened for reading
APR_MMAP_WRITE MMap opened for writing
</pre> </td></tr>
<tr><td class="paramname">cntxt</td><td>The pool to use when creating the mmap. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga4b67a2d22a07707897cc1183a1682040"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga4b67a2d22a07707897cc1183a1682040">◆ </a></span>apr_mmap_delete()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_mmap_delete </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> * </td>
<td class="paramname"><em>mm</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Remove a mmap'ed. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">mm</td><td>The mmap'ed file. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga9fcdbf8090e924a4e8f2b301519bb4c8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga9fcdbf8090e924a4e8f2b301519bb4c8">◆ </a></span>apr_mmap_dup()</h2>
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<div class="memproto">
<table class="memname">
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_mmap_dup </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> ** </td>
<td class="paramname"><em>new_mmap</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> * </td>
<td class="paramname"><em>old_mmap</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"><em>p</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Duplicate the specified MMAP. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">new_mmap</td><td>The structure to duplicate into. </td></tr>
<tr><td class="paramname">old_mmap</td><td>The mmap to duplicate. </td></tr>
<tr><td class="paramname">p</td><td>The pool to use for new_mmap. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga4c1d31bd9e911744bd5edb97e17210ec"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga4c1d31bd9e911744bd5edb97e17210ec">◆ </a></span>apr_mmap_offset()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_mmap_offset </td>
<td>(</td>
<td class="paramtype">void ** </td>
<td class="paramname"><em>addr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> * </td>
<td class="paramname"><em>mm</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_off_t </td>
<td class="paramname"><em>offset</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Move the pointer into the mmap'ed file to the specified offset. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">addr</td><td>The pointer to the offset specified. </td></tr>
<tr><td class="paramname">mm</td><td>The mmap'ed file. </td></tr>
<tr><td class="paramname">offset</td><td>The offset to move to. </td></tr>
</table>
</dd>
</dl>
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