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|
<html>
<head><title>
HDF5/H5 API Specification
</title>
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<hr>
<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
<a href="index.html">HDF5 documents and links</a> <br>
<a href="H5.intro.html">Introduction to HDF5</a> <br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br>
<!--
<a href="Glossary.html">Glossary</a><br>
-->
</td>
<td valign=top align=right>
And in this document, the
<a href="RM_H5Front.html">HDF5 Reference Manual</a> <br>
<a href="RM_H5.html">H5</a>
<a href="RM_H5A.html">H5A</a>
<a href="RM_H5D.html">H5D</a>
<a href="RM_H5E.html">H5E</a>
<a href="RM_H5F.html">H5F</a>
<a href="RM_H5G.html">H5G</a>
<a href="RM_H5I.html">H5I</a>
<a href="RM_H5P.html">H5P</a> <br>
<a href="RM_H5R.html">H5R</a>
<a href="RM_H5S.html">H5S</a>
<a href="RM_H5T.html">H5T</a>
<a href="RM_H5Z.html">H5Z</a>
<a href="Tools.html">Tools</a>
<a href="PredefDTypes.html">Datatypes</a>
</td></tr>
<tr><td colspan="2" align="right">
<i><small>(<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/PSandPDF/">PDF</a>
of complete manual formatted as print volume) </small></i>
</td></tr>
</table>
</center>
<hr>
<!-- #EndLibraryItem --><center>
<h1>H5: General Library Functions</h1>
</center>
These functions serve general-purpose needs of the HDF5 library
and it users.
<p>
<strong>The C Interfaces:</strong>
<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> </td><td valign=top>
<ul>
<li><a href="#Library-Version">H5get_libversion</a>
<li><a href="#Library-VersCheck">H5check_version</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Library-SetFreeListLimits">H5set_free_list_limits</a>
<li><a href="#Library-GarbageCollect">H5garbage_collect</a>
<li><a href="#Library-DontAtExit">H5dont_atexit</a>
</ul>
</td></tr>
</table>
<br>
<i>Alphabetical Listing</i>
<table border="0">
<tr>
<td valign="top">
<ul>
<li><a href="#Library-VersCheck">H5check_version</a>
<li><a href="#Library-Close">H5close</a>
<li><a href="#Library-DontAtExit">H5dont_atexit</a>
</ul>
</td>
<td> </td>
<td valign="top">
<ul>
<li><a href="#Library-GarbageCollect">H5garbage_collect</a>
<li><a href="#Library-Version">H5get_libversion</a>
<li><a href="#Library-Open">H5open</a>
</ul>
</td>
<td> </td>
<td valign="top">
<ul>
<li><a href="#Library-SetFreeListLimits">H5set_free_list_limits</a>
</ul>
</td>
</tr>
</table>
<br>
<strong>The FORTRAN90 Interfaces:</strong>
<br>
In general, each FORTRAN90 subroutine performs exactly the same task
as the corresponding C function.
<br>
<table border=0>
<tr><td valign=top>
<ul>
<li><a href="#Library-Open">h5open_f</a>
<li><a href="#Library-Close">h5close_f</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Library-Version">h5get_libversion_f</a>
<li><a href="#Library-VersCheck">h5check_version_f</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Library-SetFreeListLimits">h5set_free_list_limits_f</a>
<li><a href="#Library-GarbageCollect">h5garbage_collect_f</a>
<li><a href="#Library-DontAtExit">h5dont_atexit_f</a>
</ul>
</td></tr>
</table>
<!-- NEW PAGE -->
<!-- HEADER RIGHT " " -->
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5check_version" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-VersCheck">H5check_version</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5check_version</code>(<em>unsigned</em> <code>majnum</code>,
<em>unsigned</em> <code>minnum</code>,
<em>unsigned</em> <code>relnum</code>
)
<dt><strong>Purpose:</strong>
<dd>Verifies that library versions are consistent.
<dt><strong>Description:</strong>
<dd><code>H5check_version</code> verifies that the arguments provided
with the function call match the version numbers compiled into
the library.
<p>
<code>H5check_version</code> serves two slightly differing purposes.
<p>
First, the function is intended to be called by the user to verify
that the version of the header files compiled into an application
matches the version of the HDF5 library being used.
One may look at the <code>H5check</code> definition in the file
<code>H5public.h</code> as an example.
<p>
Due to the risks of data corruption or segmentation faults,
<code>H5check_version</code> causes the application to abort if the
version numbers do not match.
The abort is achieved by means of a call to the
standard C function <code>abort()</code>.
<p>
Note that <code>H5check_version</code> verifies only the
major and minor version numbers and the release number;
it does not verify the sub-release value as that should be
an empty string for any official release.
This means that any two incompatible library versions must
have different {major,minor,release} numbers. (Notice the
reverse is not necessarily true.)
<p>
Secondarily, <code>H5check_version</code> verifies that the
library version identifiers <code>H5_VERS_MAJOR</code>,
<code>H5_VERS_MINOR</code>, <code>H5_VERS_RELEASE</code>,
<code>H5_VERS_SUBRELEASE</code>, and <code>H5_VERS_INFO</code>
are consistent.
This is designed to catch source code inconsistencies,
but does not generate the fatal error as in the first stage
because this inconsistency does not cause errors in the data files.
If this check reveals inconsistencies, the library issues a warning
but the function does not fail.
<!--
<p>
<strong><em>Alternate to preceding paragraph / More to the point?</em></strong>
<br>
If the function passes the above test and does not generate
an <code>abort()</code> call, the function's second purpose
comes into play.
<code>H5check_version</code> then procedes to verify
that the additional library version identifiers
<code>H5_VERS_SUBRELEASE</code>, and <code>H5_VERS_INFO</code>
are consistent.
This is designed to catch source code inconsistencies,
but does not generate the fatal error
that is generated under the first function.
<p>
The version and release numbers passed as
<code>H5check_version</code> parameters have the
following relationsips to each other:
<dir>
An official HDF5 release is labelled as
<br>
HDF5 Release <<code>majnum</code>><strong>.</strong><<code>minnum</code>><strong>.</strong><<code>relnum</code>>
</dir>
For example, in the version of the library known as HDF5 Release 1.4.2,
the 1 is the major version number, <code>majnum</code>;
the 1 is the minor version number, <code>minnum</code>; and
the 1 is the release number, <code>relnum</code>.
-->
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>unsigned </em><code>majnum</code></td>
<td valign="top">IN: The major version of the library.</td></tr>
<tr>
<td valign="top"><em>unsigned </em><code>minnum </code></td>
<td valign="top">IN: The minor version of the library.</td></tr>
<tr>
<td valign="top"><em>unsigned </em><code>relnum</code></td>
<td valign="top">IN: The release number of the library.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful.
Upon failure, this function causes the application to abort.
<dt><strong>Fortran90 Interface:</strong> h5check_version_f
<dd>
<pre>
SUBROUTINE h5check_version_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(IN) :: majnum ! The major version of the library
INTEGER, INTENT(IN) :: minnum ! The minor version of the library
INTEGER, INTENT(IN) :: relnum ! The release number
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5check_version_f
</pre>
<dt><strong>History:</strong>
<ul><table width="90%">
<tr>
<td valign="top" align="left" width="10%">
<strong>Release</strong> </td>
<td valign="top" align="left">
<strong>Fortran90</strong></td></tr>
<tr>
<td valign="top">1.4.5</td>
<td valign="top">
Function introduced in this release.</td></tr>
</table></ul>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5close" -->
<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 generally 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.
<p>
<code>h5close_f</code> and <code>h5open_f</code> are
required calls in Fortran90 applications.
<dt><strong>Parameters:</strong>
<dl>
<dt>None.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5close_f
<dd>
<pre>
SUBROUTINE h5close_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5close_f
</pre>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5H5dont_atexit" -->
<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 a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5dont_atexit_f
<dd>
<pre>
SUBROUTINE h5dont_atexit_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5dont_atexit_f
</pre>
<dt><strong>History:</strong>
<ul><table width="90%">
<tr>
<td valign="top" align="left" width="10%">
<strong>Release</strong> </td>
<td valign="top" align="left">
<strong>Fortran90</strong></td></tr>
<tr>
<td valign="top">1.4.5</td>
<td valign="top">
Function introduced in this release.</td></tr>
</table></ul>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5garbage_collect" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-GarbageCollect">H5garbage_collect</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5garbage_collect</code>(<em>void</em>)
<dt><strong>Purpose:</strong>
<dd>Garbage collects on all free-lists of all types.
<dt><strong>Description:</strong>
<dd><code>H5garbage_collect</code> walks through all the garbage
collection routines of the library, freeing any unused memory.
<p>
It is not required that <code>H5garbage_collect</code> be called
at any particular time; it is only necessary in certain situations
where the application has performed actions that cause the library
to allocate many objects. The application should call
<code>H5garbage_collect</code> if it eventually releases those
objects and wants to reduce the memory used by the library from
the peak usage required.
<p>
The library automatically garbage collects all the free lists
when the application ends.
<dt><strong>Parameters:</strong>
<dl>
<dt>None.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5garbage_collect_f
<dd>
<pre>
SUBROUTINE h5garbage_collect_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5garbage_collect_f
</pre>
<dt><strong>History:</strong>
<ul><table width="90%">
<tr>
<td valign="top" align="left" width="10%">
<strong>Release</strong> </td>
<td valign="top" align="left">
<strong>Fortran90</strong></td></tr>
<tr>
<td valign="top">1.4.5</td>
<td valign="top">
Function introduced in this release.</td></tr>
</table></ul>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5get_libversion" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-Version">H5get_libversion</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5get_libversion</code>(<em>unsigned *</em><code>majnum</code>,
<em>unsigned *</em><code>minnum</code>,
<em>unsigned *</em><code>relnum</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the HDF library release number.
<dt><strong>Description:</strong>
<dd><code>H5get_libversion</code> retrieves the major, minor, and release
numbers of the version of the HDF library which is linked to
the application.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>unsigned *</em><code>majnum</code></td>
<td valign="top">OUT: The major version of the library.</td></tr>
<tr>
<td valign="top"><em>unsigned *</em><code>minnum </code></td>
<td valign="top">OUT: The minor version of the library.</td></tr>
<tr>
<td valign="top"><em>unsigned *</em><code>relnum</code></td>
<td valign="top">OUT: The release number of the library.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5get_libversion_f
<dd>
<pre>
SUBROUTINE h5get_libversion_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(OUT) :: majnum ! The major version of the library
INTEGER, INTENT(OUT) :: minnum ! The minor version of the library
INTEGER, INTENT(OUT) :: relnum ! The release number
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5get_libversion_f
</pre>
<dt><strong>History:</strong>
<ul><table width="90%">
<tr>
<td valign="top" align="left" width="10%">
<strong>Release</strong> </td>
<td valign="top" align="left">
<strong>Fortran90</strong></td></tr>
<tr>
<td valign="top">1.4.5</td>
<td valign="top">
Function introduced in this release.</td></tr>
</table></ul>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
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</dl>
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<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>Initializes the HDF5 library.
<dt><strong>Description:</strong>
<dd><code>H5open</code> initialize the library.
<p>
When the HDF5 Library is employed in a C application,
this function is normally called automatically, but if you
find that an HDF5 library function is failing inexplicably,
try calling this function first.
If you wish to elimnate this possibility, it is safe to
routinely call <code>H5open</code> before an application
starts working with the library as there are no damaging
side-effects in calling it more than once.
<p>
When the HDF5 Library is employed in a Fortran90 application,
<code>h5open_f</code> initializes global variables
(e.g. predefined types) and performs other tasks required to
initialize the library.
<code>h5open_f</code> and <code>h5close_f</code> are therefore
required calls in Fortran90 applications.
<dt><strong>Parameters:</strong>
<dl>
<dt>None.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5open_f
<dd>
<pre>
SUBROUTINE h5open_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5open_f
</pre>
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<dd>
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</dl>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Library-SetFreeListLimits">H5set_free_list_limits</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5set_free_list_limits</code>(<em>int</em> <code>reg_global_lim</code>,
<em>int</em> <code>reg_list_lim</code>,
<em>int</em> <code>arr_global_lim</code>,
<em>int</em> <code>arr_list_lim</code>,
<em>int</em> <code>blk_global_lim</code>,
<em>int</em> <code>blk_list_lim</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets free-list size limits.
<dt><strong>Description:</strong>
<dd><code>H5set_free_list_limits</code> sets size limits
on all types of free lists.
The HDF5 library uses free lists internally to manage memory.
There are three types of free lists:
<ul><li><span class=termDef>Regular</span>
free lists manage a single data structure.
<li><span class=termDef>Array</span>
free lists manage arrays of a data structure.
<li><span class=termDef>Block</span>
free lists manage blocks of bytes.
</ul>
<em>Alternate phrasing?</em>:
<ul><li><span class=termDef>Regular</span>
free lists manage data structures containing atomic data.
<li><span class=termDef>Array</span>
free lists manage data structures containing array data.
<li><span class=termDef>Block</span>
free lists manage blocks of bytes.
</ul>
<p>
These are global limits, but each limit applies only to
free lists of the specified type.
Therefore, if an application sets a 1Mb limit on each of
the global lists, up to 3Mb of total storage might be
allocated, 1Mb for each of the regular, array, and
block type lists.
<p>
Using a value of <code>-1</code> for a limit means that
no limit is set for the specified type of free list.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>int</em> <code>reg_global_lim </code></td>
<td valign="top">IN: The limit on all regular free list memory used</td></tr>
<tr>
<td valign="top"><em>int</em> <code>reg_list_lim</code></td>
<td valign="top">IN: The limit on memory used in each regular free list</td></tr>
<tr>
<td valign="top"><em>int</em> <code>arr_global_lim</code></td>
<td valign="top">IN: The limit on all array free list memory used</td></tr>
<tr>
<td valign="top"><em>int</em> <code>arr_list_lim</code></td>
<td valign="top">IN: The limit on memory used in each array free list</td></tr>
<tr>
<td valign="top"><em>int</em> <code>blk_global_lim</code></td>
<td valign="top">IN: The limit on all block free list memory used</td></tr>
<tr>
<td valign="top"><em>int</em> <code>blk_list_lim</code></td>
<td valign="top">IN: The limit on memory used in each block free list</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
<!--
<pre>
SUBROUTINE
</pre>
-->
<dt><strong>History:</strong>
<ul><table width="90%">
<tr>
<td valign="top" align="left" width="10%">
<strong>Release</strong> </td>
<td valign="top" align="left">
<strong>C</strong></td></tr>
<tr>
<td valign="top">1.6.0</td>
<td valign="top">
Function introduced in this release.</td></tr>
</table></ul>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" -->
<hr>
<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
<a href="index.html">HDF5 documents and links</a> <br>
<a href="H5.intro.html">Introduction to HDF5</a> <br>
<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br>
<!--
<a href="Glossary.html">Glossary</a><br>
-->
</td>
<td valign=top align=right>
And in this document, the
<a href="RM_H5Front.html">HDF5 Reference Manual</a> <br>
<a href="RM_H5.html">H5</a>
<a href="RM_H5A.html">H5A</a>
<a href="RM_H5D.html">H5D</a>
<a href="RM_H5E.html">H5E</a>
<a href="RM_H5F.html">H5F</a>
<a href="RM_H5G.html">H5G</a>
<a href="RM_H5I.html">H5I</a>
<a href="RM_H5P.html">H5P</a> <br>
<a href="RM_H5R.html">H5R</a>
<a href="RM_H5S.html">H5S</a>
<a href="RM_H5T.html">H5T</a>
<a href="RM_H5Z.html">H5Z</a>
<a href="Tools.html">Tools</a>
<a href="PredefDTypes.html">Datatypes</a>
</td></tr>
<tr><td colspan="2" align="right">
<i><small>(<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/PSandPDF/">PDF</a>
of complete manual formatted as print volume) </small></i>
</td></tr>
</table>
</center>
<hr>
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<address>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
<br>
Describes HDF5 Release 1.6.5, October 2005
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