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<title>Apache Portable Runtime: MMAP (Memory Map) Routines</title>
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<h1>MMAP (Memory Map) Routines</h1><table border=0 cellpadding=0 cellspacing=0>
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<tr><td colspan=2><br><h2>Data Structures</h2></td></tr>
<tr><td class="memItemLeft" nowrap 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>
<tr><td colspan=2><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga5">APR_MMAP_READ</a> 1</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga6">APR_MMAP_WRITE</a> 2</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga7">APR_MMAP_THRESHOLD</a> 1</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga8">APR_MMAP_LIMIT</a> (4*1024*1024)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>#define </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga9">APR_MMAP_CANDIDATE</a>(filelength) ((filelength >= APR_MMAP_THRESHOLD) && (filelength < APR_MMAP_LIMIT))</td></tr>
<tr><td colspan=2><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>typedef <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#ga0">apr_mmap_t</a></td></tr>
<tr><td colspan=2><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga1">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#ga2">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#ga0">apr_pool_t</a> *cntxt)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga2">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#ga0">apr_pool_t</a> *p)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga3">apr_mmap_delete</a> (<a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> *mm)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> </td><td class="memItemRight" valign=bottom><a class="el" href="group__apr__mmap.html#ga4">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>
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<hr><h2>Define Documentation</h2>
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<td class="md" nowrap valign="top"> #define APR_MMAP_CANDIDATE </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">filelength </td>
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<td class="md" nowrap> ((filelength >= APR_MMAP_THRESHOLD) && (filelength < APR_MMAP_LIMIT))</td>
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Can this file be MMaped </td>
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<td class="md" nowrap valign="top"> #define APR_MMAP_LIMIT (4*1024*1024) </td>
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Maximum size of MMap region </td>
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<td class="md" nowrap valign="top"> #define APR_MMAP_READ 1 </td>
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MMap opened for reading </td>
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<td class="md" nowrap valign="top"> #define APR_MMAP_THRESHOLD 1 </td>
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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. </td>
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<td class="md" nowrap valign="top"> #define APR_MMAP_WRITE 2 </td>
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MMap opened for writing </td>
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<hr><h2>Typedef Documentation</h2>
<a class="anchor" name="ga0" doxytag="apr_mmap.h::apr_mmap_t" ></a><p>
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<td class="md" nowrap valign="top"> 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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<dl compact><dt><b>See also:</b></dt><dd><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> </dd></dl>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="ga1" doxytag="apr_mmap.h::apr_mmap_create" ></a><p>
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<td class="md" nowrap valign="top"> <a class="el" href="group__apr__errno.html#ga0">apr_status_t</a> apr_mmap_create </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="structapr__mmap__t.html">apr_mmap_t</a> ** </td>
<td class="mdname" nowrap> <em>newmmap</em>, </td>
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<td class="md" nowrap><a class="el" href="group__apr__file__io.html#ga2">apr_file_t</a> * </td>
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