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<html>
<head><title>
HDF5/H5E API Specification
</title>
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<h1>H5E: Error Interface</h1>
</center>
<h2>Error API Functions</h2>
These functions provide error handling capabilities in the HDF5 environment.
<p>
<strong>The C Interfaces:</strong>
<table border=0>
<tr><td valign=top>
<ul>
<li><a href="#Error-Clear">H5Eclear</a>
<li><a href="#Error-Print">H5Eprint</a>
<li><a href="#Error-Push">H5Epush</a>
<li><a href="#Error-SetAuto">H5Eset_auto</a>
<li><a href="#Error-GetAuto">H5Eget_auto</a>
<li><a href="#Error-Walk">H5Ewalk</a>
<li><a href="#Error-WalkCB">H5Ewalk_cb</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Error-GetMajor">H5Eget_major</a>
<li><a href="#Error-AutoIsStack">H5Eauto_is_stack</a>
<li><a href="#Error-RegisterClass">H5Eregister_class</a>
<li><a href="#Error-CreateMsg">H5Ecreate_msg</a>
<li><a href="#Error-GetClassName">H5Eget_class_name</a>
<li><a href="#Error-GetMsg">H5Eget_msg</a>
<li><a href="#Error-Pop">H5Epop</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Error-GetNum">H5Eget_num</a>
<li><a href="#Error-CloseMsg">H5Eclose_msg</a>
<li><a href="#Error-UnregisterClass">H5Eunregister_class</a>
<li><a href="#Error-GetCurrentStack">H5Eget_current_stack</a>
<li><a href="#Error-SetCurrentStack">H5Eset_current_stack</a>
<li><a href="#Error-CloseStack">H5Eclose_stack</a>
</ul>
</td></tr>
</table>
<br>
<i>Alphabetical Listing</i>
<table border="0">
<tr>
<td valign="top">
<ul>
<li><a href="#Error-AutoIsStack">H5Eauto_is_stack</a>
<li><a href="#Error-Clear">H5Eclear</a>
<li><a href="#Error-CloseMsg">H5Eclose_msg</a>
<li><a href="#Error-CloseStack">H5Eclose_stack</a>
<li><a href="#Error-CreateMsg">H5Ecreate_msg</a>
<li><a href="#Error-GetAuto">H5Eget_auto</a>
<li><a href="#Error-GetClassName">H5Eget_class_name</a>
</ul>
</td>
<td> </td>
<td valign="top">
<ul>
<li><a href="#Error-GetCurrentStack">H5Eget_current_stack</a>
<li><a href="#Error-GetMajor">H5Eget_major</a>
<li><a href="#Error-GetMinor">H5Eget_minor</a>
<li><a href="#Error-GetMsg">H5Eget_msg</a>
<li><a href="#Error-GetNum">H5Eget_num</a>
<li><a href="#Error-Pop">H5Epop</a>
<li><a href="#Error-Print">H5Eprint</a>
</ul>
</td>
<td> </td>
<td valign="top">
<ul>
<li><a href="#Error-Push">H5Epush</a>
<li><a href="#Error-RegisterClass">H5Eregister_class</a>
<li><a href="#Error-SetAuto">H5Eset_auto</a>
<li><a href="#Error-SetCurrentStack">H5Eset_current_stack</a>
<li><a href="#Error-UnregisterClass">H5Eunregister_class</a>
<li><a href="#Error-Walk">H5Ewalk</a>
<li><a href="#Error-WalkCB">H5Ewalk_cb</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="#Error-Clear">h5eclear_f</a>
<li><a href="#Error-Print">h5eprint_f</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Error-SetAuto">h5eset_auto_f</a>
<!--<li><a href="#Error-GetAuto">h5eget_auto_f</a> -->
<!--<li><a href="#Error-Walk">h5ewalk_f</a> -->
<!--<li><a href="#Error-WalkCB">h5ewalk_cb_f</a> -->
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Error-GetMajor">h5eget_major_f</a>
<li><a href="#Error-GetMinor">h5eget_minor_f</a>
</ul>
</td></tr>
</table>
<p>
The Error interface provides error handling in the form of a stack.
The <code>FUNC_ENTER()</code> macro clears the error stack whenever
an interface function is entered.
When an error is detected, an entry is pushed onto the stack.
As the functions unwind, additional entries are pushed onto the stack.
The API function will return some indication that an error occurred and
the application can print the error stack.
<p>
Certain API functions in the H5E package, such as <code>H5Eprint</code>,
do not clear the error stack. Otherwise, any function which
does not have an underscore immediately after the package name
will clear the error stack. For instance, <code>H5Fopen</code>
clears the error stack while <code>H5F_open</code> does not.
<p>
An error stack has a fixed maximum size.
If this size is exceeded then the stack will be truncated and only the
inner-most functions will have entries on the stack.
This is expected to be a rare condition.
<p>
Each thread has its own error stack, but since
multi-threading has not been added to the library yet, this
package maintains a single error stack. The error stack is
statically allocated to reduce the complexity of handling
errors within the H5E package.
<!-- NEW PAGE -->
<!-- HEADER RIGHT " " -->
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eauto_is_stack" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-AutoIsStack">H5Eauto_is_stack</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eauto_is_stack</code>(<em>hid_t</em>
<code>estack_id</code>, <em>unsigned</em> *<code>is_stack</code>)
<dt><strong>Purpose:</strong>
<dd>Determines type of error stack.
<dt><strong>Description:</strong>
<dd><code>H5Eauto_is_stack</code> determines whether the error auto
reporting function for an error stack conforms to the
<code>H5E_auto_stack_t</code> typedef or the
<code>H5E_auto_t</code> typedef.
<p>
The <code>is_stack</code> parameter is set to <code>1</code>1
if the error stack conforms to <code>H5E_auto_stack_t</code>
and <code>0</code> for if <code>H5E_auto_t</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>estack_id</code></td>
<td valign="top">The error stack identifier</td></tr>
<tr>
<td valign="top"><em>unsigned</em>* <code>is_stack</code> </td>
<td valign="top">A flag indicating which error stack typedef
the specified error stack conforms to. </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>
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eclear" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-Clear">H5Eclear</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eclear</code>(<code>void</code>)
<dt><strong>Purpose:</strong>
<dd>Clears the error stack for the current thread.
<dt><strong>Description:</strong>
<dd><code>H5Eclear</code> clears the error stack for the current thread.
<p>
The stack is also cleared whenever an API function is called,
with certain exceptions (for instance, <code>H5Eprint</code>).
<p>
<code>H5Eclear</code> can fail if there are problems initializing
the library.
<dt><strong>Parameters:</strong>
<ul><table>
<tr><td valign="top">None</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> h5eclear_f
<dd>
<pre>
SUBROUTINE h5eclear_f(hdferr)
IMPLICIT NONE
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5eclear_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 "H5Eclose_msg" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-CloseMsg">H5Eclose_msg</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eclose_msg</code>(<em>hid_t</em>
<code>mesg_id</code>)
<dt><strong>Purpose:</strong>
<dd>Closes an error message identifier.
<dt><strong>Description:</strong>
<dd><code>H5Eclose_msg</code> closes an error message identifier.,
which can be either a major or minor message.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>mesg_id</code> </td>
<td valign="top">IN: Error message identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eclose_stack" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-CloseStack">H5Eclose_stack</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eclose_stack</code>(<em>hid_t</em>
<code>error_stack</code>)
<dt><strong>Purpose:</strong>
<dd>Closes object handle for error stack.
<dt><strong>Description:</strong>
<dd><code>H5Eclose_stack</code> closes the object handle for an
error stack and releases its resources. <code>H5E_DEFAULT</code>
cannot be closed.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>error_stack</code> </td>
<td valign="top">IN: Error stack identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Ecreate_msg" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-CreateMsg">H5Ecreate_msg</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Ecreate_msg</code>(<em>hid_t</em>
<code>class</code>, <em>H5E_type_t</em> <code>msg_type</code>,
<em>const char</em>* <code>mesg</code>)
<dt><strong>Purpose:</strong>
<dd>Add major error message to an error class.
<dt><strong>Description:</strong>
<dd><code>H5Ecreate_msg</code> adds an error message to an error class
defined by client library or application program. The error message
can be either major or minor which is indicated
by parameter <code>msg_type</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>class</code> </td>
<td valign="top">IN: Error class identifier.</td></tr>
<tr>
<td valign="top"><em>H5E_type_t</em> <code>msg_type</code> </td>
<td valign="top">IN: The type of the error message.
<br>
Valid values are <code>H5E_MAJOR</code> and
<code>H5E_MINOR</code>.</td></tr>
<tr>
<td valign="top"><em>const char</em>* <code>mesg</code> </td>
<td valign="top">IN: Major error message.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a message identifier on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eget_auto" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetAuto">H5Eget_auto</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eget_auto</code>(<em>H5E_auto_t *</em> <code>func</code>,
<em>void **</em><code>client_data</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the current settings for the automatic error stack
traversal function and its data.
<dt><strong>Description:</strong>
<dd><code>H5Eget_auto</code> returns the current settings for the
automatic error stack traversal function, <code>func</code>,
and its data, <code>client_data</code>. Either (or both)
arguments may be null in which case the value is not returned.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5E_auto_t *</em> <code>func</code></td>
<td valign="top">OUT: Current setting for the function to be called upon an
error condition.</td></tr>
<tr>
<td valign="top"><em>void **</em><code>client_data </code></td>
<td valign="top">OUT: Current setting for the data passed to the error function.</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>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eget_class_name" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetClassName">H5Eget_class_name</a>
<dt><strong>Signature:</strong>
<dd><em>ssize_t</em> <code>H5Eget_class_name</code>(<em>hid_t</em>
<code>class_id</code>, <em>char</em>* <code>name</code>,
<em>size_t</em> <code>size</code>)
<dt><strong>Purpose:</strong>
<dd>Retrieves error class name.
<dt><strong>Description:</strong>
<dd><code>H5Eget_class_name</code> retrieves the name of the error class
specified by the class identifier.
If non-NULL pointer is passed in for <code>name</code> and
<code>size</code> is greater than zero, the class
name of <code>size</code> long is returned. The length of the error
class name is also returned.
If NULL is passed in as name, only the length of
class name is returned. If zero is returned, it means no name.
User is responsible for allocated enough buffer for the name.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>class_id</code> </td>
<td valign="top">IN: Error class identifier.</td></tr>
<tr>
<td valign="top"><em>char</em>* <code>name</code> </td>
<td valign="top">OUT: The name of the class to be queried.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>size</code> </td>
<td valign="top">IN: The length of class name to be returned
by this function.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns non-negative value as on success;
otherwise returns negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eget_current_stack" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetCurrentStack">H5Eget_current_stack</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Eget_current_stack</code>(<em>void</em>)
<dt><strong>Purpose:</strong>
<dd>Registers the current error stack.
<dt><strong>Description:</strong>
<dd><code>H5Eget_current_stack</code> registers the current error stack,
returns an object identifier, and clears the current error stack.
An empty error stack will also be assigned an identifier.
<dt><strong>Parameters:</strong>
<ul><table>
<tr><td>None.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the identifier of the current error stack on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eget_major" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetMajor">H5Eget_major</a>
<dt><strong>Signature:</strong>
<dd><em>const char *</em> <code>H5Eget_major</code>(<em>H5E_major_t</em> <code>n</code>)
<dt><strong>Purpose:</strong>
<dd>Returns a character string describing an error specified by a
major error number.
<dt><strong>Description:</strong>
<dd>Given a major error number, <code>H5Eget_major</code> returns a
constant character string that describes the error.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5E_major_t</em> <code>n </code></td>
<td valign="top">IN: Major error number.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd> Returns a character string describing the error if successful.
Otherwise returns "Invalid major error number."
<dt><strong>Fortran90 Interface:</strong> h5eget_major_f
<dd>
<pre>
SUBROUTINE h5eget_major_f(error_no, name, hdferr)
INTEGER, INTENT(IN) :: error_no !Major error number
CHARACTER(LEN=*), INTENT(OUT) :: name ! File name
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5eget_major_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 "H5Eget_minor" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetMinor">H5Eget_minor</a>
<dt><strong>Signature:</strong>
<dd><em>const char *</em> <code>H5Eget_minor</code>(<em>H5E_minor_t</em> <code>n</code>)
<dt><strong>Purpose:</strong>
<dd>Returns a character string describing an error specified by a
minor error number.
<dt><strong>Description:</strong>
<dd>Given a minor error number, <code>H5Eget_minor</code> returns a
constant character string that describes the error.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5E_minor_t</em> <code>n </code></td>
<td valign="top">IN: Minor error number.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd> Returns a character string describing the error if successful.
Otherwise returns "Invalid minor error number."
<dt><strong>Fortran90 Interface:</strong> h5eget_minor_f
<dd>
<pre>
SUBROUTINE h5eget_minor_f(error_no, name, hdferr)
INTEGER, INTENT(IN) :: error_no !Major error number
CHARACTER(LEN=*), INTENT(OUT) :: name ! File name
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5eget_minor_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 "H5Eget_msg" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetMsg">H5Eget_msg</a>
<dt><strong>Signature:</strong>
<dd><em>ssize_t</em> <code>H5Eget_msg</code>(<em>hid_t</em>
<code>mesg_id</code>, <em>H5E_type_t</em>* <code>mesg_type</code>,
<em>char</em>* <code>mesg</code>, <em>size_t</em> <code>size</code>)
<dt><strong>Purpose:</strong>
<dd>Retrieves an error message.
<dt><strong>Description:</strong>
<dd><code>H5Eget_msg</code> retrieves the error message including its
length and type. The error message is specified by <code>mesg_id</code>.
User is responsible for passing in enough buffer for the message.
If <code>mesg</code> is not NULL and <code>size</code> is greater than zero,
the error message of <code>size</code> long is returned. The length of the
message is also returned. If NULL is passed in as <code>mesg</code>, only the
length and type of the message is returned. If the return value is zero,
it means no message.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>mesg_id</code> </td>
<td valign="top">IN: Idenfier for error message to be queried.</td></tr>
<tr>
<td valign="top"><em>H5E_type_t</em>* <code>mesg_type</code> </td>
<td valign="top">OUT: The type of the error message.
<br>
Valid values are <code>H5E_MAJOR</code> and
<code>H5E_MINOR</code>.</td></tr>
<tr>
<td valign="top"><em>char</em>* <code>mesg</code> </td>
<td valign="top">OUT: Error message buffer.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>size</code> </td>
<td valign="top">IN: The length of error message to be returned
by this function.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the size of the error message in bytes on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eget_num" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-GetNum">H5Eget_num</a>
<dt><strong>Signature:</strong>
<dd><em>ssize_t</em> <code>H5Eget_num</code>(<em>hid_t</em> <code>error_stack</code>)
<dt><strong>Purpose:</strong>
<dd>Retrieves the number of error messages in an error stack.
<dt><strong>Description:</strong>
<dd><code>H5Eget_num</code> retrieves the number of error records
in the error stack specified by <code>error_stack</code>
(including major, minor messages and description).
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>error_stack</code>
</td>
<td valign="top">IN: Error stack identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Epop" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-Pop">H5Epop</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Epop</code>(<em>hid_t</em>
<code>error_stack</code>, <em>size_t</em> <code>count</code>)
<dt><strong>Purpose:</strong>
<dd>Deletes specified number of error messages from the error stack.
<dt><strong>Description:</strong>
<dd><code>H5Epop</code> deletes the number of error records specified
in <code>count</code> from the top of the error stack
specified by <code>error_stack</code>
(including major, minor messages and description).
The number of error messages to be deleted is specified by count.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>error_stack</code>
</td>
<td valign="top">IN: Error stack identifier.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>count</code></td>
<td valign="top">IN: The number of error messages to be deleted
from the top of error stack.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eprint" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-Print">H5Eprint</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eprint</code>(<em>FILE *</em> <code>stream</code>)
<dt><strong>Purpose:</strong>
<dd>Prints the error stack in a default manner.
<dt><strong>Description:</strong>
<dd><code>H5Eprint</code> prints the error stack on the specified
stream, <code>stream</code>.
Even if the error stack is empty, a one-line message will be printed:
<br>
<code>HDF5-DIAG: Error detected in thread 0.</code>
<p>
<code>H5Eprint</code> is a convenience function for
<code>H5Ewalk</code> with a function that prints error messages.
Users are encouraged to write their own more specific error handlers.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>FILE *</em> <code>stream </code></td>
<td valign="top">IN: File pointer, or stderr if NULL.</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> h5eprint_f
<dd>
<pre>
SUBROUTINE h5eprint_f(hdferr, name)
CHARACTER(LEN=*), OPTIONAL, INTENT(IN) :: name ! File name
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5eprint_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 "H5Epush" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-Push">H5Epush</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Epush</code>(
<em>const char *</em><code>file</code>,
<em>const char *</em><code>func</code>,
<em>unsigned</em> <code>line</code>,
<em>H5E_major_t</em> <code>maj_num</code>,
<em>H5E_minor_t</em> <code>min_num</code>,
<em>const char *</em><code>str</code>
)
<dt><strong>Purpose:</strong>
<dd>Pushes new error record onto error stack.
<dt><strong>Description:</strong>
<dd><code>H5Epush</code> pushes a new error record onto the
error stack for the current thread.
<p>
The error has major and minor numbers <code>maj_num</code> and
<code>min_num</code>,
the function <code>func</code> where the error was detected,
the name of the file <code>file</code> where the error was detected,
the line <code>line</code> within that file,
and an error description string <code>str</code>.
<p>
The function name, file name, and error description strings
must be statically allocated.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>const char *</em><code>file</code>,</td>
<td valign="top">IN: Name of the file in which the error was detected.</td></tr>
<tr>
<td valign="top"><em>const char *</em><code>func</code>,</td>
<td valign="top">IN: Name of the function in which the error was detected.</td></tr>
<tr>
<td valign="top"><em>unsigned</em> <code>line</code>,</td>
<td valign="top">IN: Line within the file at which the error was detected.</td></tr>
<tr>
<td valign="top"><em>H5E_major_t</em> <code>maj_num, </code></td>
<td valign="top">IN: Major error number.</td></tr>
<tr>
<td valign="top"><em>H5E_minor_t</em> <code>min_num</code>,</td>
<td valign="top">IN: Minor error number.</td></tr>
<tr>
<td valign="top"><em>const char *</em><code>str</code></td>
<td valign="top">IN: Error description string.</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>
-->
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eregister_class" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-RegisterClass">H5Eregister_class</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Eregister_class</code>(<em>const char</em>*
<code>cls_name</code>, <em>const char</em>* <code>lib_name</code>,
<em>const char</em>* <code>version</code>)
<dt><strong>Purpose:</strong>
<dd>Registers a client library or application program to HDF5 error API.
<dt><strong>Description:</strong>
<dd><code>H5Eregister_class</code> registers a client library or
application program to HDF5 error API so that the client library
or application program can report error together with HDF5 library.
It receives an identifier for this error class for further error
operations. The library name and version number will
be printed out in the error message as preamble.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>const char</em>* <code>cls_name</code>, </td>
<td valign="top">IN: Name of the error class.</td></tr>
<tr>
<td valign="top"><em>const char</em>* <code>lib_name</code>,</td>
<td valign="top">IN: Name of the client library or application
to which the error class belongs.</td></tr>
<tr>
<td valign="top"><em>const char</em>* <code>version</code>,</td>
<td valign="top">IN: Version of the client library or application
to which the error class belongs.
A NULL can be passed in.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a class identifier on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eset_auto" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-SetAuto">H5Eset_auto</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eset_auto</code>(<em>H5E_auto_t</em> <code>func</code>,
<em>void *</em><code>client_data</code>
)
<dt><strong>Purpose:</strong>
<dd>Turns automatic error printing on or off.
<dt><strong>Description:</strong>
<dd><code>H5Eset_auto</code> turns on or off automatic printing of
errors. When turned on (non-null <code>func</code> pointer),
any API function which returns an error indication will
first call <code>func</code>, passing it <code>client_data</code>
as an argument.
<p>
When the library is first initialized the auto printing function
is set to <code>H5Eprint</code> (cast appropriately) and
<code>client_data</code> is the standard error stream pointer,
<code>stderr</code>.
<p>
Automatic stack traversal is always in the
<code>H5E_WALK_DOWNWARD</code> direction.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5E_auto_t</em> <code>func</code></td>
<td valign="top">IN: Function to be called upon an error condition.</td></tr>
<tr>
<td valign="top"><em>void *</em><code>client_data </code></td>
<td valign="top">IN: Data passed to the error function.</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> h5eset_auto_f
<dd>
<pre>
SUBROUTINE h5eset_auto_f(printflag, hdferr)
INTEGER, INTENT(IN) :: printflag !flag to turn automatic error
!printing on or off
!possible values are:
!printon (1)
!printoff(0)
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5eset_auto_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 "H5Eset_current_stack" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-SetCurrentStack">H5Eset_current_stack</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eset_current_stack</code>(<em>hid_t</em>
<code>error_stack</code>)
<dt><strong>Purpose:</strong>
<dd>Replaces the current error stack.
<dt><strong>Description:</strong>
<dd><code>H5Eset_current_stack</code> replaces the content of
the current error stack with a copy of the content of error stack
specified by <code>error_stack</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>error_stack</code>, </td>
<td valign="top">IN: Error stack identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Eunregister_class" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-UnregisterClass">H5Eunregister_class</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Eunregister_class</code>(<em>hid_t</em>
<code>class_id</code>)
<dt><strong>Purpose:</strong>
<dd>Removes an error class.
<dt><strong>Description:</strong>
<dd><code>H5Eunregister_class</code> removes the error class specified
by <code>class_id</code>.
All the major and minor errors in this class will also be closed.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>class_id</code>, </td>
<td valign="top">IN: Error class identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value on success;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Ewalk" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-Walk">H5Ewalk</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Ewalk</code>(<em>H5E_direction_t</em> <code>direction</code>,
<em>H5E_walk_t</em> <code>func</code>,
<em>void *</em> <code>client_data</code>
)
<dt><strong>Purpose:</strong>
<dd>Walks the error stack for the current thread, calling a specified
function.
<dt><strong>Description:</strong>
<dd><code>H5Ewalk</code> walks the error stack for the current thread
and calls the specified function for each error along the way.
<p>
<code>direction</code> determines whether the stack is walked
from the inside out or the outside in.
A value of <code>H5E_WALK_UPWARD</code> means begin with the
most specific error and end at the API;
a value of <code>H5E_WALK_DOWNWARD</code> means to start at the
API and end at the inner-most function where the error was first
detected.
<p>
<code>func</code> will be called for each error in the error stack.
Its arguments will include an index number (beginning at zero
regardless of stack traversal direction), an error stack entry,
and the <code>client_data</code> pointer passed to
<code>H5E_print</code>.
The <code>H5E_walk_t</code> prototype is as follows:
<dir>
<p>
<code>typedef</code> <em>herr_t</em> <code>(*H5E_walk_t)(</code><em>int</em> <code>n,</code>
<em>H5E_error_t *</em><code>err_desc,</code>
<em>void *</em><code>client_data)</code>
<p>
where the parameters have the following meanings:
<dl>
<dt><em>int</em> <code>n</code>
<dd>Indexed position of the error in the stack.
<dt><em>H5E_error_t *</em><code>err_desc</code>
<dd>Pointer to a data structure describing the error.
<em>(This structure is currently described only in the
source code file </em><code>hdf5/src/H5Epublic.h</code><em>.
That file also contains the definitive list of major
and minor error codes. That information will
eventually be presented as an appendix to this
<cite>Reference Manual</cite>.)</em>
<dt><em>void *</em><code>client_data</code>
<dd>Pointer to client data in the format expected by
the user-defined function.
</dl>
</dir>
<p>
<code>H5Ewalk</code> can fail if there are problems initializing
the library.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5E_direction_t</em> <code>direction </code></td>
<td valign="top">IN: Direction in which the error stack is to be walked.</td></tr>
<tr>
<td valign="top"><em>H5E_walk_t</em> <code>func</code></td>
<td valign="top">IN: Function to be called for each error encountered.</td></tr>
<tr>
<td valign="top"><em>void *</em> <code>client_data</code></td>
<td valign="top">IN: Data to be passed with <code>func</code>.</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.
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Error-WalkCB">H5Ewalk_cb</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Ewalk_cb</code>(<em>int</em> <code>n</code>,
<em>H5E_error_t *</em><code>err_desc</code>,
<em>void</em> <code>*client_data</code>
)
<dt><strong>Purpose:</strong>
<dd>Default error stack traversal callback function
that prints error messages to the specified output stream.
<dt><strong>Description:</strong>
<dd><code>H5Ewalk_cb</code> is a default error stack traversal callback
function that prints error messages to the specified output stream.
It is not meant to be called directly but rather as an
argument to the <code>H5Ewalk</code> function.
This function is called also by <code>H5Eprint</code>.
Application writers are encouraged to use this function as a
model for their own error stack walking functions.
<p>
<code>n</code> is a counter for how many times this function
has been called for this particular traversal of the stack.
It always begins at zero for the first error on the stack
(either the top or bottom error, or even both, depending on
the traversal direction and the size of the stack).
<p>
<code>err_desc</code> is an error description. It contains all the
information about a particular error.
<p>
<code>client_data</code> is the same pointer that was passed as the
<code>client_data</code> argument of <code>H5Ewalk</code>.
It is expected to be a file pointer (or stderr if NULL).
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>int</em> <code>n</code></td>
<td valign="top">IN/OUT: Number of times this function has been called
for this traversal of the stack.</td></tr>
<tr>
<td valign="top"><em>H5E_error_t *</em><code>err_desc </code></td>
<td valign="top">OUT: Error description.</td></tr>
<tr>
<td valign="top"><em>void</em> <code>*client_data</code></td>
<td valign="top">IN: A file pointer, or stderr if NULL.</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.
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