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<html>
<head><title>
HDF5/H5 Draft API Specification
</title></head>

<body>

<hr>
<center>
<a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;
H5&nbsp;&nbsp;
<a href="RM_H5A.html">H5A</a>&nbsp;&nbsp;
<a href="RM_H5D.html">H5D</a>&nbsp;&nbsp;
<a href="RM_H5E.html">H5E</a>&nbsp;&nbsp;
<a href="RM_H5F.html">H5F</a>&nbsp;&nbsp;
<a href="RM_H5G.html">H5G</a>&nbsp;&nbsp;
<a href="RM_H5P.html">H5P</a>&nbsp;&nbsp;
<a href="RM_H5S.html">H5S</a>&nbsp;&nbsp;
<a href="RM_H5T.html">H5T</a>&nbsp;&nbsp;
<a href="RM_H5Z.html">H5Z</a>&nbsp;&nbsp;
<a href="Glossary.html">Glossary</a>
</center>
<hr>

<center>
<h1>H5: General Library Functions</h1>
</center>

These functions serve general-purpose needs of the HDF5 library
and it users.

<table border=0>
<tr><td valign=top>
<ul>
    <li><a href="#Library-Open">H5open</a>
    <li><a href="#Library-Close">H5close</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Library-Version">H5version</a>
    <li><a href="#Library-VersCheck">H5vers_check</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Library-DontAtExit">H5dont_atexit</a>
</ul>
</td></tr>
</table>


<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-Open">H5open</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5open</code>(<em>void</em>)
<dt><strong>Purpose:</strong>
    <dd>Flushes all data to disk, closes file identifiers, and cleans up memory.
<dt><strong>Description:</strong>
    <dd><code>H5open</code> initialize the library.  This function is 
        normally called automatically, but if you find that an 
        HDF5 library function is failing inexplicably, try calling 
        this function first.
<dt><strong>Parameters:</strong>
    <dl>
        <dt>None.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns SUCCEED (0) if successful;
        otherwise FAIL (-1).
</dl>


<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-Close">H5close</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5close</code>(<em>void</em>)
<dt><strong>Purpose:</strong>
    <dd>Flushes all data to disk, closes file identifiers, and cleans up memory.
<dt><strong>Description:</strong>
    <dd><code>H5close</code> flushes all data to disk, 
        closes all file identifiers, and cleans up all memory used by
        the library.  This function is generall called when the 
        application calls <code>exit</code>, but may be called earlier 
        in event of an emergency shutdown or out of desire to free all 
        resources used by the HDF5 library.
<dt><strong>Parameters:</strong>
    <dl>
        <dt>None.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns SUCCEED (0) if successful;
        otherwise FAIL (-1).
</dl>


<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-DontAtExit">H5dont_atexit</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5dont_atexit</code>(<em>void</em>)
<dt><strong>Purpose:</strong>
    <dd>Instructs library not to install <code>atexit</code> cleanup routine.
<dt><strong>Description:</strong>
    <dd><code>H5dont_atexit</code> indicates to the library that an 
        <code>atexit()</code> cleanup routine should not be installed.  
        The major purpose for this is in situations where the 
        library is dynamically linked into an application and is 
        un-linked from the application before <code>exit()</code> gets 
        called.  In those situations, a routine installed with 
        <code>atexit()</code> would jump to a routine which was 
        no longer in memory, causing errors.
        <p>
        In order to be effective, this routine <em>must</em> be called 
        before any other HDF function calls, and must be called each 
        time the library is loaded/linked into the application 
        (the first time and after it's been un-loaded).
<dt><strong>Parameters:</strong>
    <dl>
        <dt>None.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns SUCCEED (0) if successful;
        otherwise FAIL (-1).
</dl>


<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-Version">H5version</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5version</code>(<em>unsigned *</em><code>majnum</code>,
            <em>unsigned *</em><code>minnum</code>,
            <em>unsigned *</em><code>relnum</code>,
            <em>unsigned *</em><code>patnum</code>
        )
<dt><strong>Purpose:</strong>
    <dd>
<dt><strong>Description:</strong>
    <dd><code>H5version</code> retrieves the major, minor, release, and
        patch versions of the library which is linked to the application.  
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>unsigned *</em><code>majnum</code>
            <dd>The major version of the library.
        <dt><em>unsigned *</em><code>minnum</code>
            <dd>The minor version of the library.
        <dt><em>unsigned *</em><code>relnum</code>
            <dd>The release number of the library.
        <dt><em>unsigned *</em><code>patnum</code>
            <dd>The patch number of the library.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns SUCCEED (0) if successful;
        otherwise FAIL (-1).
</dl>


<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-VersCheck">H5vers_check</a>
<dt><strong>Signature:</strong>
    <dd><em>herr_t</em> <code>H5vers_check</code>(<em>unsigned *</em><code>majnum</code>,
            <em>unsigned *</em><code>minnum</code>,
            <em>unsigned *</em><code>relnum</code>,
            <em>unsigned *</em><code>patnum</code>
        )
<dt><strong>Purpose:</strong>
    <dd>
<dt><strong>Description:</strong>
    <dd><code>H5vers_check</code> verifies that the arguments match the 
        version numbers compiled into the library.  This function is intended 
        to be called from user to verify that the versions of header files 
        compiled into the application match the version of the HDF5 library.  
        <p>
        Due to the risks of data corruption or segmentation faults, 
        <code>H5vers_check</code> causes the application to abort if the
        version numbers do not match.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>unsigned *</em><code>majnum</code>
            <dd>The major version of the library.
        <dt><em>unsigned *</em><code>minnum</code>
            <dd>The minor version of the library.
        <dt><em>unsigned *</em><code>relnum</code>
            <dd>The release number of the library.
        <dt><em>unsigned *</em><code>patnum</code>
            <dd>The patch number of the library.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns SUCCEED (0) if successful.
        Upon failure, this function causes the application to abort.
</dl>


<hr>
<center>
<a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;
H5&nbsp;&nbsp;
<a href="RM_H5A.html">H5A</a>&nbsp;&nbsp;
<a href="RM_H5D.html">H5D</a>&nbsp;&nbsp;
<a href="RM_H5E.html">H5E</a>&nbsp;&nbsp;
<a href="RM_H5F.html">H5F</a>&nbsp;&nbsp;
<a href="RM_H5G.html">H5G</a>&nbsp;&nbsp;
<a href="RM_H5P.html">H5P</a>&nbsp;&nbsp;
<a href="RM_H5S.html">H5S</a>&nbsp;&nbsp;
<a href="RM_H5T.html">H5T</a>&nbsp;&nbsp;
<a href="RM_H5Z.html">H5Z</a>&nbsp;&nbsp;
<a href="Glossary.html">Glossary</a>
</center>
<hr>

<address>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a> 

<br>
Last modified:  14 July 1998

</body>
</html>