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Purpose:
Marking files for "Release 1.4, February 2001."
Description:
Across doc files
Updating "Describes HDF5 Release..." entry to "Describes
HDF5 Release 1.4, February 2001."
Copyright.html: Added 2001 to years copyrighted.
index.html: Changed header to Release 1.4 (from 1.4 Beta)
Platforms tested:
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296 lines
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296 lines
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<html>
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<head><title>
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HDF5/H5 API Specification
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</title></head>
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<body bgcolor="#FFFFFF">
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<hr>
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<center>
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<table border=0 width=98%>
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<tr><td valign=top align=left>
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<a href="H5.intro.html">Introduction to HDF5</a> <br>
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<a href="H5.user.html">HDF5 User Guide</a> <br>
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<a href="index.html">Other HDF5 documents and links</a> <br>
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<!--
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<a href="Glossary.html">Glossary</a><br>
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-->
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<br>
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H5
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<a href="RM_H5A.html">H5A</a>
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<a href="RM_H5D.html">H5D</a>
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<a href="RM_H5E.html">H5E</a>
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<a href="RM_H5F.html">H5F</a>
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5I.html">H5I</a>
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<a href="RM_H5P.html">H5P</a>
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<br>
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<a href="RM_H5R.html">H5R</a>
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<a href="RM_H5S.html">H5S</a>
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<a href="RM_H5T.html">H5T</a>
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<a href="RM_H5Z.html">H5Z</a>
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<a href="Tools.html">Tools</a>
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<a href="PredefDTypes.html">Datatypes</a>
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</td></tr>
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</table>
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</center>
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<hr>
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<center>
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<h1>H5: General Library Functions</h1>
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</center>
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These functions serve general-purpose needs of the HDF5 library
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and it users.
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<table border=0>
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<tr><td valign=top>
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<ul>
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<li><a href="#Library-Open">H5open</a>
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<li><a href="#Library-Close">H5close</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Library-Version">H5get_libversion</a>
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<li><a href="#Library-VersCheck">H5check_version</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Library-GarbageCollect">H5garbage_collect</a>
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<li><a href="#Library-DontAtExit">H5dont_atexit</a>
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</ul>
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</td></tr>
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</table>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Library-Open">H5open</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5open</code>(<em>void</em>)
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<dt><strong>Purpose:</strong>
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<dd>Initializes the HDF5 library.
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<dt><strong>Description:</strong>
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<dd><code>H5open</code> initialize the library. This function is
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normally called automatically, but if you find that an
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HDF5 library function is failing inexplicably, try calling
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this function first.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt>None.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Library-Close">H5close</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5close</code>(<em>void</em>)
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<dt><strong>Purpose:</strong>
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<dd>Flushes all data to disk, closes file identifiers, and cleans up memory.
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<dt><strong>Description:</strong>
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<dd><code>H5close</code> flushes all data to disk,
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closes all file identifiers, and cleans up all memory used by
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the library. This function is generall called when the
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application calls <code>exit</code>, but may be called earlier
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in event of an emergency shutdown or out of desire to free all
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resources used by the HDF5 library.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt>None.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Library-GarbageCollect">H5garbage_collect</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5garbage_collect</code>(<em>void</em>)
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<dt><strong>Purpose:</strong>
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<dd>Garbage collects on all free-lists of all types.
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<dt><strong>Description:</strong>
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<dd><code>H5garbage_collect</code> walks through all the garbage
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collection routines of the library, freeing any unused memory.
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<p>
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It is not required that <code>H5garbage_collect</code> be called
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at any particular time; it is only necessary in certain situations
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where the application has performed actions that cause the library
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to allocate many objects. The application should call
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<code>H5garbage_collect</code> if it eventually releases those
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objects and wants to reduce the memory used by the library from
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the peak usage required.
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<p>
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The library automatically garbage collects all the free lists
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when the application ends.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt>None.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Library-DontAtExit">H5dont_atexit</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5dont_atexit</code>(<em>void</em>)
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<dt><strong>Purpose:</strong>
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<dd>Instructs library not to install <code>atexit</code> cleanup routine.
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<dt><strong>Description:</strong>
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<dd><code>H5dont_atexit</code> indicates to the library that an
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<code>atexit()</code> cleanup routine should not be installed.
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The major purpose for this is in situations where the
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library is dynamically linked into an application and is
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un-linked from the application before <code>exit()</code> gets
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called. In those situations, a routine installed with
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<code>atexit()</code> would jump to a routine which was
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no longer in memory, causing errors.
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<p>
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In order to be effective, this routine <em>must</em> be called
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before any other HDF function calls, and must be called each
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time the library is loaded/linked into the application
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(the first time and after it's been un-loaded).
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<dt><strong>Parameters:</strong>
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<dl>
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<dt>None.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Library-Version">H5get_libversion</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5get_libversion</code>(<em>unsigned *</em><code>majnum</code>,
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<em>unsigned *</em><code>minnum</code>,
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<em>unsigned *</em><code>relnum</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Returns the HDF library release number.
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<dt><strong>Description:</strong>
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<dd><code>H5get_libversion</code> retrieves the major, minor, and release
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numbers of the version of the HDF library which is linked to
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the application.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>unsigned *</em><code>majnum</code>
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<dd>OUT: The major version of the library.
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<dt><em>unsigned *</em><code>minnum</code>
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<dd>OUT: The minor version of the library.
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<dt><em>unsigned *</em><code>relnum</code>
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<dd>OUT: The release number of the library.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Library-VersCheck">H5check_version</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5check_version</code>(<em>unsigned</em> <code>majnum</code>,
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<em>unsigned</em> <code>minnum</code>,
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<em>unsigned</em> <code>relnum</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>
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<dt><strong>Description:</strong>
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<dd><code>H5check_version</code> verifies that the arguments match the
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version numbers compiled into the library. This function is intended
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to be called by the user to verify that the version of the header files
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compiled into the application matches the version of the HDF5 library
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being used.
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<p>
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Due to the risks of data corruption or segmentation faults,
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<code>H5check_version</code> causes the application to abort if the
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version numbers do not match.
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<p>
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If the version numbers of the library do not match
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the version numbers in the header files being checked, the library calls the
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standard C function <code>abort()</code>.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>unsigned </em><code>majnum</code>
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<dd>IN: The major version of the library.
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<dt><em>unsigned </em><code>minnum</code>
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<dd>IN: The minor version of the library.
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<dt><em>unsigned </em><code>relnum</code>
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<dd>IN: The release number of the library.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful.
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Upon failure, this function causes the application to abort.
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</dl>
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<hr>
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<center>
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<table border=0 width=98%>
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<tr><td valign=top align=left>
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<a href="H5.intro.html">Introduction to HDF5</a> <br>
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<a href="H5.user.html">HDF5 User Guide</a> <br>
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<a href="index.html">Other HDF5 documents and links</a> <br>
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<!--
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<a href="Glossary.html">Glossary</a><br>
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-->
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<br>
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H5
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<a href="RM_H5A.html">H5A</a>
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<a href="RM_H5D.html">H5D</a>
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<a href="RM_H5E.html">H5E</a>
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<a href="RM_H5F.html">H5F</a>
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5I.html">H5I</a>
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<a href="RM_H5P.html">H5P</a>
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<br>
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<a href="RM_H5R.html">H5R</a>
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<a href="RM_H5S.html">H5S</a>
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<a href="RM_H5T.html">H5T</a>
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<a href="RM_H5Z.html">H5Z</a>
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<a href="Tools.html">Tools</a>
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<a href="PredefDTypes.html">Datatypes</a>
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</td></tr>
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</table>
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</center>
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<hr>
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<address>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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<br>
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Last modified: 17 July 2000
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<br>
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Describes HDF5 Release 1.4, February 2001
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</body>
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</html>
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