1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
|
<html>
<head><title>
HDF5/H5E API Specification
</title>
<!-- #BeginLibraryItem "/ed_libs/styles_RM.lbi" -->
<!--
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
-->
<link href="ed_styles/RMelect.css" rel="stylesheet" type="text/css">
<!-- #EndLibraryItem --></head>
<body bgcolor="#FFFFFF">
<!-- HEADER RIGHT " " -->
<!-- #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>
</table>
</center>
<hr><!-- #EndLibraryItem --><center>
<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>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Error-SetAuto">H5Eset_auto</a>
<li><a href="#Error-GetAuto">H5Eget_auto</a>
<li><a href="#Error-Walk">H5Ewalk</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Error-WalkCB">H5Ewalk_cb</a>
<li><a href="#Error-GetMajor">H5Eget_major</a>
<li><a href="#Error-GetMinor">H5Eget_minor</a>
</ul>
</td></tr>
</table>
<br>
<i>Alphabetical Listing</i>
<table border="0">
<tr>
<td valign="top">
<ul>
<li><a href="#Error-Clear">H5Eclear</a>
<li><a href="#Error-GetAuto">H5Eget_auto</a>
<li><a href="#Error-GetMajor">H5Eget_major</a>
</ul>
</td>
<td> </td>
<td valign="top">
<ul>
<li><a href="#Error-GetMinor">H5Eget_minor</a>
<li><a href="#Error-Print">H5Eprint</a>
<li><a href="#Error-Push">H5Epush</a>
</ul>
</td>
<td> </td>
<td valign="top">
<ul>
<li><a href="#Error-SetAuto">H5Eset_auto</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 "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 "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_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 "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>
-->
<!--<dt><strong>Non-C API(s):</strong>
<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</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 "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.
<!--
<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 "H5Ewalk_cb" -->
<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.
<!--
<pre>
SUBROUTINE
</pre>
-->
<!--<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>
</table>
</center>
<hr><!-- #EndLibraryItem --><!-- #BeginLibraryItem "/ed_libs/Footer.lbi" --><address>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
<br>
Describes HDF5 Release 1.7, the unreleased development branch; working toward HDF5 Release 1.8.0
</address><!-- #EndLibraryItem --><SCRIPT LANGUAGE="JAVASCRIPT">
<!--
document.writeln("Last modified: 24 February 2004");
-->
</SCRIPT>
</body>
</html>
|
