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362 lines
13 KiB
HTML
<html>
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<head><title>
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HDF5/H5E Draft API Specification
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</title></head>
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<body>
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<hr>
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<center>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<a href="RM_H5.html">H5</a>
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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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H5E
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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_H5P.html">H5P</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="Glossary.html">Glossary</a>
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</center>
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<hr>
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<center>
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<h1>H5E: Error Interface</h1>
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</center>
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<h2>Error API Functions</h2>
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These functions provide error handling capabilities in the HDF5 environment.
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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="#Error-SetAuto">H5Eset_auto</a>
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<li><a href="#Error-GetAuto">H5Eget_auto</a>
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<li><a href="#Error-Clear">H5Eclear</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="#Error-Print">H5Eprint</a>
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<li><a href="#Error-Walk">H5Ewalk</a>
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<li><a href="#Error-WalkCB">H5Ewalk_cb</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="#Error-GetMajor">H5Eget_major</a>
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<li><a href="#Error-GetMinor">H5Eget_minor</a>
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</ul>
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</td></tr>
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</table>
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<p>
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The Error interface provides error handling in the form of a stack.
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The <code>FUNC_ENTER()</code> macro clears the error stack whenever
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an interface function is entered.
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When an error is detected, an entry is pushed onto the stack.
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As the functions unwind, additional entries are pushed onto the stack.
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The API function will return some indication that an error occurred and
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the application can print the error stack.
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<p>
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Certain API functions in the H5E package, such as <code>H5Eprint()</code>,
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do not clear the error stack. Otherwise, any function which
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does not have an underscore immediately after the package name
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will clear the error stack. For instance, <code>H5Fopen()</code>
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clears the error stack while <code>H5F_open()</code> does not.
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<p>
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An error stack has a fixed maximum size.
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If this size is exceeded then the stack will be truncated and only the
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inner-most functions will have entries on the stack.
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This is expected to be a rare condition.
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<p>
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Each thread has its own error stack, but since
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multi-threading has not been added to the library yet, this
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package maintains a single error stack. The error stack is
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statically allocated to reduce the complexity of handling
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errors within the H5E package.
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Error-SetAuto">H5Eset_auto</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Eset_auto</code>(<em>H5E_auto_t</em> <code>func</code>,
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<em>void *</em><code>client_data</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Turns automatic error printing on or off.
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<dt><strong>Description:</strong>
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<dd><code>H5Eset_auto</code> turns on or off automatic printing of
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errors. When turned on (non-null <code>func</code> pointer),
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any API function which returns an error indication will
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first call <code>func</code>, passing it <code>client_data</code>
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as an argument.
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<p>
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When the library is first initialized the auto printing function
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is set to <code>H5Eprint()</code> (cast appropriately) and
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<code>client_data</code> is the standard error stream pointer,
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<code>stderr</code>.
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<p>
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Automatic stack traversal is always in the
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<code>H5E_WALK_DOWNWARD</code> direction.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>H5E_auto_t</em> <code>func</code>
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<dd>Function to be called upon an error condition.
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<dt><em>void *</em><code>client_data</code>
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<dd>Data passed to the error function.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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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="Error-GetAuto">H5Eget_auto</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Eget_auto</code>(<em>H5E_auto_t *</em> <code>func</code>,
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<em>void **</em><code>client_data</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Returns the current settings for the automatic error stack
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traversal function and its data.
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<dt><strong>Description:</strong>
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<dd><code>H5Eget_auto</code> returns the current settings for the
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automatic error stack traversal function, <code>func</code>,
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and its data, <code>client_data</code>. Either (or both)
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arguments may be null in which case the value is not returned.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>H5E_auto_t *</em> <code>func</code>
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<dd>Current setting for the function to be called upon an
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error condition.
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<dt><em>void **</em><code>client_data</code>
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<dd>Current setting for the data passed to the error function.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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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="Error-Clear">H5Eclear</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Eclear</code>(<code>void</code>)
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<dt><strong>Purpose:</strong>
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<dd>Clears the error stack for the current thread.
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<dt><strong>Description:</strong>
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<dd><code>H5Eclear</code> clears the error stack for the current thread.
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<p>
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The stack is also cleared whenever an API function is called,
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with certain exceptions (for instance, <code>H5Eprint()</code>).
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<p>
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<code>H5Eclear</code> can fail if there are problems initializing
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the 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 SUCCEED (0) if successful;
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otherwise FAIL (-1).
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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="Error-Print">H5Eprint</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Eprint</code>(<em>FILE *</em> <code>stream</code>)
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<dt><strong>Purpose:</strong>
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<dd>Prints the error stack in a default manner.
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<dt><strong>Description:</strong>
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<dd><code>H5Eprint</code> prints the error stack on the specified
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stream, <code>stream</code>.
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Even if the error stack is empty, a one-line message will be printed:
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<br>
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<code>HDF5-DIAG: Error detected in thread 0.</code>
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<p>
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<code>H5Eprint</code> is a convenience function for
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<code>H5Ewalk()</code> with a function that prints error messages.
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Users are encouraged to write there own more specific error handlers.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>FILE *</em> <code>stream</code>
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<dd>File pointer, or stderr if NULL.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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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="Error-Walk">H5Ewalk</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Ewalk</code>(<em>H5E_direction_t</em> <code>direction</code>,
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<em>H5E_walk_t</em> <code>func</code>,
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<em>void *</em> <code>client_data</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Walks the error stack for the current thread, calling a specified
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function.
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<dt><strong>Description:</strong>
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<dd><code>H5Ewalk</code> walks the error stack for the current thread
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and calls the specified function for each error along the way.
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<p>
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<code>direction</code> determines whether the stack is walked
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from the inside out or the outside in.
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A value of <code>H5E_WALK_UPWARD</code> means begin with the
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most specific error and end at the API;
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a value of <code>H5E_WALK_DOWNWARD</code> means to start at the
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API and end at the inner-most function where the error was first
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detected.
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<p>
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<code>func</code> will be called for each error in the error stack.
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Its arguments will include an index number (beginning at zero
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regardless of stack traversal direction), an error stack entry,
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and the <code>client_data</code> pointer passed to
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<code>H5E_print</code>.
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<p>
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<code>H5Ewalk</code> can fail if there are problems initializing
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the library.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>H5E_direction_t</em> <code>direction</code>
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<dd>Direction in which the error stack is to be walked.
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<dt><em>H5E_walk_t</em> <code>func</code>
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<dd>Function to be called for each error encountered.
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<dt><em>void *</em> <code>client_data</code>
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<dd>Data to be passed with <code>func</code>.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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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="Error-WalkCB">H5Ewalk_cb</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t</em> <code>H5Ewalk_cb</code>(<em>int</em> <code>n</code>,
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<em>H5E_error_t *</em><code>err_desc</code>,
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<em>void</em> <code>*client_data</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Default error stack traversal callback function
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that prints error messages to the specified output stream.
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<dt><strong>Description:</strong>
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<dd><code>H5Ewalk_cb</code> is a default error stack traversal callback
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function that prints error messages to the specified output stream.
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It is not meant to be called directly but rather as an
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argument to the <code>H5Ewalk()</code> function.
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This function is called also by <code>H5Eprint()</code>.
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Application writers are encouraged to use this function as a
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model for their own error stack walking functions.
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<p>
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<code>n</code> is a counter for how many times this function
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has been called for this particular traversal of the stack.
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It always begins at zero for the first error on the stack
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(either the top or bottom error, or even both, depending on
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the traversal direction and the size of the stack).
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<p>
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<code>err_desc</code> is an error description. It contains all the
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information about a particular error.
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<p>
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<code>client_data</code> is the same pointer that was passed as the
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<code>client_data</code> argument of <code>H5Ewalk()</code>.
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It is expected to be a file pointer (or stderr if null).
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>int</em> <code>n</code>
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<dd>Number of times this function has been called
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for this traversal of the stack.
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<dt><em>H5E_error_t *</em><code>err_desc</code>
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<dd>Error description.
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<dt><em>void</em> <code>*client_data</code>
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<dd>A file pointer, or stderr if null.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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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="Error-GetMajor">H5Eget_major</a>
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<dt><strong>Signature:</strong>
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<dd><em>const char *</em> <code>H5Eget_major</code>(<em>H5E_major_t</em> <code>n</code>)
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<dt><strong>Purpose:</strong>
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<dd>Returns a character string describing an error specified by a
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major error number.
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<dt><strong>Description:</strong>
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<dd>Given a major error number, <code>H5Eget_major</code> returns a
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constant character string that describes the error.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>H5E_major_t</em> <code>n</code>
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<dd>Major error number.
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</dl>
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<dt><strong>Returns:</strong>
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<dd> Returns a character string describing the error if successful.
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Otherwise returns "Invalid major error number."
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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="Error-GetMinor">H5Eget_minor</a>
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<dt><strong>Signature:</strong>
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<dd><em>const char *</em> <code>H5Eget_minor</code>(<em>H5E_minor_t</em> <code>n</code>)
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<dt><strong>Purpose:</strong>
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<dd>Returns a character string describing an error specified by a
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minor error number.
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<dt><strong>Description:</strong>
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<dd>Given a minor error number, <code>H5Eget_minor</code> returns a
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constant character string that describes the error.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>H5E_minor_t</em> <code>n</code>
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<dd>Minor error number.
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</dl>
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<dt><strong>Returns:</strong>
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<dd> Returns a character string describing the error if successful.
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Otherwise returns "Invalid minor error number."
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</dl>
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<hr>
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<center>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<a href="RM_H5.html">H5</a>
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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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H5E
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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_H5P.html">H5P</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="Glossary.html">Glossary</a>
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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: 14 July 1998
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</body>
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</html>
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