summaryrefslogtreecommitdiffstats
path: root/src/H5G.c
blob: 33ef12d7af8e1b4bb48fbc471ab3225e9a43a5eb (plain)
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
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:	H5G.c
 *		Jul 18 1997
 *		Robb Matzke <matzke@llnl.gov>
 *
 * Purpose:	Symbol table functions.	 The functions that begin with
 *		`H5G_stab_' don't understand the naming system; they operate
 * 		on a single symbol table at a time.
 *
 *		The functions that begin with `H5G_node_' operate on the leaf
 *		nodes of a symbol table B-tree.  They should be defined in
 *		the H5Gnode.c file.
 *
 *		The remaining functions know how to traverse the group
 *		directed graph.
 *
 * Names:	Object names are a slash-separated list of components.  If
 *		the name begins with a slash then it's absolute, otherwise
 *		it's relative ("/foo/bar" is absolute while "foo/bar" is
 *		relative).  Multiple consecutive slashes are treated as
 *		single slashes and trailing slashes are ignored.  The special
 *		case `/' is the root group.  Every file has a root group.
 *
 *		API functions that look up names take a location ID and a
 *		name.  The location ID can be a file ID or a group ID and the
 *		name can be relative or absolute.
 *
 *              +--------------+----------- +--------------------------------+
 * 		| Location ID  | Name       | Meaning                        |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "/foo/bar" | Find `foo' within `bar' within |
 *		|              |            | the root group of the specified|
 *		|              |            | file.                          |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "foo/bar"  | Find `foo' within `bar' within |
 *		|              |            | the root group of the specified|
 *		|              |            | file.                          |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "/"        | The root group of the specified|
 *		|              |            | file.                          |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "."        | The root group of the specified|
 *		|              |            | the specified file.            |
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "/foo/bar" | Find `foo' within `bar' within |
 *		|              |            | the root group of the file     |
 *		|              |            | containing the specified group.|
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "foo/bar"  | File `foo' within `bar' within |
 *		|              |            | the specified group.           |
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "/"        | The root group of the file     |
 *		|              |            | containing the specified group.|
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "."        | The specified group.           |
 *              +--------------+------------+--------------------------------+
 *
 *
 *-------------------------------------------------------------------------
 */

/****************/
/* Module Setup */
/****************/

#define H5G_PACKAGE		/*suppress error about including H5Gpkg   */

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5G_init_interface


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5ACprivate.h"	/* Metadata cache			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Gpkg.h"		/* Groups		  		*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Pprivate.h"         /* Property lists                       */
#include "H5VLprivate.h"	/* VOL plugins				*/

/****************/
/* Local Macros */
/****************/


/******************/
/* Local Typedefs */
/******************/


/********************/
/* Package Typedefs */
/********************/


/********************/
/* Local Prototypes */
/********************/


/*********************/
/* Package Variables */
/*********************/


/*****************************/
/* Library Private Variables */
/*****************************/


/*******************/
/* Local Variables */
/*******************/

/* Group ID class */
static const H5I_class_t H5I_GROUP_CLS[1] = {{
    H5I_GROUP,			/* ID class value */
    0,				/* Class flags */
    64,				/* Minimum hash size for class */
    0,				/* # of reserved IDs for class */
    NULL,                 	/* Callback routine for closing objects of this class */
    (H5I_free2_t)H5G_close_group /* Callback routine for closing auxilary objects of this class */
}};



/*-------------------------------------------------------------------------
 * Function:	H5G__init
 *
 * Purpose:	Initialize the interface from some other package.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, November 11, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G__init(void)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(FAIL)
    /* FUNC_ENTER() does all the work */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G__init() */


/*-------------------------------------------------------------------------
 * Function:	H5G_init_interface
 *
 * Purpose:	Initializes the H5G interface.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Monday, January	 5, 1998
 *
 * Notes:       The group creation properties are registered in the property
 *              list interface initialization routine (H5P_init_interface)
 *              so that the file creation property class can inherit from it
 *              correctly. (Which allows the file creation property list to
 *              control the group creation properties of the root group of
 *              a file) QAK - 24/10/2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_init_interface(void)
{
    herr_t          ret_value = SUCCEED;  /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Initialize the atom group for the group IDs */
    if(H5I_register_type(H5I_GROUP_CLS) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to initialize interface")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_init_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5G_term_interface
 *
 * Purpose:	Terminates the H5G interface
 *
 * Return:	Success:	Positive if anything is done that might
 *				affect other interfaces; zero otherwise.
 *
 * 		Failure:	Negative.
 *
 * Programmer:	Robb Matzke
 *		Monday, January	 5, 1998
 *
 *-------------------------------------------------------------------------
 */
int
H5G_term_interface(void)
{
    int	n = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    if(H5_interface_initialize_g) {
	if((n = H5I_nmembers(H5I_GROUP)))
	    H5I_clear_type(H5I_GROUP, FALSE, FALSE);
	else {
	    /* Destroy the group object id group */
	    H5I_dec_type_ref(H5I_GROUP);

	    /* Mark closed */
	    H5_interface_initialize_g = 0;
	    n = 1; /*H5I*/
	} /* end else */
    } /* end if */

    FUNC_LEAVE_NOAPI(n)
} /* end H5G_term_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5Gcreate2
 *
 * Purpose:	Creates a new group relative to LOC_ID, giving it the
 *              specified creation property list GCPL_ID and access
 *              property list GAPL_ID.  The link to the new group is
 *              created with the LCPL_ID.
 *
 * Usage:       H5Gcreate2(loc_id, char *name, lcpl_id, gcpl_id, gapl_id)
 *                  hid_t loc_id;	  IN: File or group identifier
 *                  const char *name; IN: Absolute or relative name of the new group
 *                  hid_t lcpl_id;	  IN: Property list for link creation
 *                  hid_t gcpl_id;	  IN: Property list for group creation
 *                  hid_t gapl_id;	  IN: Property list for group access
 *
 * Return:	Success:	The object ID of a new, empty group open for
 *				writing.  Call H5Gclose() when finished with
 *				the group.
 *
 *		Failure:	FAIL
 *
 * Programmer:  Quincey Koziol
 *	        April 5, 2007
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gcreate2(hid_t loc_id, const char *name, hid_t lcpl_id, hid_t gcpl_id, hid_t gapl_id)
{
    void    *grp = NULL;       /* dset token from VOL plugin */
    void    *obj = NULL;        /* object token of loc_id */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    H5VL_loc_params_t loc_params;
    H5P_genplist_t  *plist;            /* Property list pointer */
    hid_t	    ret_value;          /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE5("i", "i*siii", loc_id, name, lcpl_id, gcpl_id, gapl_id);

    /* Check arguments */
    if(!name || !*name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Get correct property list */
    if(H5P_DEFAULT == lcpl_id)
        lcpl_id = H5P_LINK_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lcpl_id, H5P_LINK_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link creation property list")

    /* Check group creation property list */
    if(H5P_DEFAULT == gcpl_id)
        gcpl_id = H5P_GROUP_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gcpl_id, H5P_GROUP_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group create property list")

    /* Check the group access property list */
    if(H5P_DEFAULT == gapl_id)
        gapl_id = H5P_GROUP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gapl_id, H5P_GROUP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    /* Get the plist structure */
    if(NULL == (plist = (H5P_genplist_t *)H5I_object(gcpl_id)))
        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")

    if(H5P_set(plist, H5VL_GRP_LCPL_ID, &lcpl_id) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't set property value for lcpl id")

    loc_params.type = H5VL_OBJECT_BY_SELF;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the file object */
    if(NULL == (obj = (void *)H5I_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")

    /* Create the group through the VOL */
    if(NULL == (grp = H5VL_group_create(obj, loc_params, vol_plugin, name, gcpl_id, gapl_id, H5_REQUEST_NULL)))
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group")

    /* Get an atom for the group */
    if((ret_value = H5I_register2(H5I_GROUP, grp, vol_plugin, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to atomize dataset handle")

done:
    if (ret_value < 0 && grp)
        if(H5VL_group_close (grp, vol_plugin, H5_REQUEST_NULL) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release group")
    FUNC_LEAVE_API(ret_value)
} /* end H5Gcreate2() */


/*-------------------------------------------------------------------------
 * Function:	H5Gcreate_anon
 *
 * Purpose:	Creates a new group relative to LOC_ID, giving it the
 *              specified creation property list GCPL_ID and access
 *              property list GAPL_ID.
 *
 *              The resulting ID should be linked into the file with
 *              H5Olink or it will be deleted when closed.
 *
 *              Given the default setting, H5Gcreate_anon() followed by
 *              H5Olink() will have the same function as H5Gcreate2().
 *
 * Usage:       H5Gcreate_anon(loc_id, char *name, gcpl_id, gapl_id)
 *                  hid_t loc_id;	  IN: File or group identifier
 *                  const char *name; IN: Absolute or relative name of the new group
 *                  hid_t gcpl_id;	  IN: Property list for group creation
 *                  hid_t gapl_id;	  IN: Property list for group access
 *
 * Example:	To create missing groups "A" and "B01" along the given path "/A/B01/grp"
 *              hid_t create_id = H5Pcreate(H5P_GROUP_CREATE);
 *              int   status = H5Pset_create_intermediate_group(create_id, TRUE);
 *              hid_t gid = H5Gcreate_anon(file_id, "/A/B01/grp", create_id, H5P_DEFAULT);
 *
 * Return:	Success:	The object ID of a new, empty group open for
 *				writing.  Call H5Gclose() when finished with
 *				the group.
 *
 *		Failure:	FAIL
 *
 * Programmer:  Peter Cao
 *	        May 08, 2005
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gcreate_anon(hid_t loc_id, hid_t gcpl_id, hid_t gapl_id)
{
    void    *grp = NULL;       /* dset token from VOL plugin */
    void    *obj = NULL;        /* object token of loc_id */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    H5VL_loc_params_t loc_params;
    hid_t	    ret_value;

    FUNC_ENTER_API(FAIL)
    H5TRACE3("i", "iii", loc_id, gcpl_id, gapl_id);

    /* Check group creation property list */
    if(H5P_DEFAULT == gcpl_id)
        gcpl_id = H5P_GROUP_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gcpl_id, H5P_GROUP_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group create property list")

    /* Check the group access property list */
    if(H5P_DEFAULT == gapl_id)
        gapl_id = H5P_GROUP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gapl_id, H5P_GROUP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    loc_params.type = H5VL_OBJECT_BY_SELF;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the file object */
    if(NULL == (obj = (void *)H5I_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")

    /* Create the group through the VOL */
    if(NULL == (grp = H5VL_group_create(obj, loc_params, vol_plugin, NULL, gcpl_id, gapl_id, H5_REQUEST_NULL)))
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group")

    /* Get an atom for the group */
    if((ret_value = H5I_register2(H5I_GROUP, grp, vol_plugin, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to atomize dataset handle")

done:
    if (ret_value < 0 && grp)
        if(H5VL_group_close (grp, vol_plugin, H5_REQUEST_NULL) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release group")
    FUNC_LEAVE_API(ret_value)
} /* end H5Gcreate_anon() */


/*-------------------------------------------------------------------------
 * Function:	H5Gopen2
 *
 * Purpose:	Opens an existing group for modification.  When finished,
 *		call H5Gclose() to close it and release resources.
 *
 *              This function allows the user the pass in a Group Access
 *              Property List, which H5Gopen1() does not.
 *
 * Return:	Success:	Object ID of the group.
 *		Failure:	FAIL
 *
 * Programmer:	James Laird
 *		Thursday, July 27, 2006
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gopen2(hid_t loc_id, const char *name, hid_t gapl_id)
{
    void    *grp = NULL;       /* dset token from VOL plugin */
    void    *obj = NULL;        /* object token of loc_id */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    H5VL_loc_params_t loc_params;
    hid_t       ret_value;              /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE3("i", "i*si", loc_id, name, gapl_id);

    /* Check args */
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Check the group access property list */
    if(H5P_DEFAULT == gapl_id)
        gapl_id = H5P_GROUP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gapl_id, H5P_GROUP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    loc_params.type = H5VL_OBJECT_BY_SELF;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the file object */
    if(NULL == (obj = (void *)H5I_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")

    /* Create the group through the VOL */
    if(NULL == (grp = H5VL_group_open(obj, loc_params, vol_plugin, name, gapl_id, H5_REQUEST_NULL)))
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group")

    /* Get an atom for the group */
    if((ret_value = H5I_register2(H5I_GROUP, grp, vol_plugin, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to atomize dataset handle")

done:
    if (ret_value < 0 && grp)
        if(H5VL_group_close (grp, vol_plugin, H5_REQUEST_NULL) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release group")
    FUNC_LEAVE_API(ret_value)
} /* end H5Gopen2() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_create_plist
 *
 * Purpose:	Returns a copy of the group creation property list.
 *
 * Return:	Success:	ID for a copy of the group creation
 *				property list.  The property list ID should be
 *				released by calling H5Pclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, October 25, 2005
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gget_create_plist(hid_t grp_id)
{
    H5VL_t     *vol_plugin;
    void       *grp;
    hid_t	ret_value = FAIL;

    FUNC_ENTER_API(FAIL)
    H5TRACE1("i", "i", grp_id);

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(grp_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the dataset object */
    if(NULL == (grp = (void *)H5I_object(grp_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid group identifier")

    if(H5VL_group_get(grp, vol_plugin, H5VL_GROUP_GET_GCPL, H5_REQUEST_NULL, &ret_value) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group creation properties")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_create_plist() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_info
 *
 * Purpose:	Retrieve information about a group.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		November 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gget_info(hid_t loc_id, H5G_info_t *grp_info)
{
    H5VL_t     *vol_plugin;
    void       *obj;
    H5I_type_t  id_type;                /* Type of ID */
    H5VL_loc_params_t loc_params;
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "i*x", loc_id, grp_info);

    /* Check args */
    id_type = H5I_get_type(loc_id);
    if(!(H5I_GROUP == id_type || H5I_FILE == id_type))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid argument")
    if(!grp_info)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no info struct")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the dataset object */
    if(NULL == (obj = (void *)H5I_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid group identifier")

    loc_params.type = H5VL_OBJECT_BY_SELF;
    loc_params.obj_type = id_type;

    /* Get the group info through the VOL using the location token */
    if((ret_value = H5VL_group_get(obj, vol_plugin, H5VL_GROUP_GET_INFO, H5_REQUEST_NULL, 
                                   loc_params, grp_info)) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group info")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_info() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_info_by_name
 *
 * Purpose:	Retrieve information about a group.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		November 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gget_info_by_name(hid_t loc_id, const char *name, H5G_info_t *grp_info,
    hid_t lapl_id)
{
    H5VL_t     *vol_plugin;
    void       *obj;
    H5VL_loc_params_t loc_params;
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE4("e", "i*s*xi", loc_id, name, grp_info, lapl_id);

    /* Check args */
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")
    if(!grp_info)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no info struct")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    loc_params.type = H5VL_OBJECT_BY_NAME;
    loc_params.loc_data.loc_by_name.name = name;
    loc_params.loc_data.loc_by_name.plist_id = lapl_id;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the dataset object */
    if(NULL == (obj = (void *)H5I_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid group identifier")

    /* Get the group info through the VOL using the location token */
    if((ret_value = H5VL_group_get(obj, vol_plugin, H5VL_GROUP_GET_INFO, H5_REQUEST_NULL, 
                                   loc_params, grp_info)) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group info")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_info_by_name() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_info_by_idx
 *
 * Purpose:	Retrieve information about a group, according to the order
 *              of an index.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		November 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gget_info_by_idx(hid_t loc_id, const char *group_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, H5G_info_t *grp_info, hid_t lapl_id)
{
    H5VL_t     *vol_plugin;
    void       *obj;
    H5VL_loc_params_t loc_params;
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE7("e", "i*sIiIoh*xi", loc_id, group_name, idx_type, order, n, grp_info,
             lapl_id);

    /* Check args */
    if(!group_name || !*group_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name specified")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(!grp_info)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no info struct")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    loc_params.type = H5VL_OBJECT_BY_IDX;
    loc_params.loc_data.loc_by_idx.name = group_name;
    loc_params.loc_data.loc_by_idx.idx_type = idx_type;
    loc_params.loc_data.loc_by_idx.order = order;
    loc_params.loc_data.loc_by_idx.n = n;
    loc_params.loc_data.loc_by_idx.plist_id = lapl_id;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the dataset object */
    if(NULL == (obj = (void *)H5I_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid group identifier")

    /* Get the group info through the VOL using the location token */
    if((ret_value = H5VL_group_get(obj, vol_plugin, H5VL_GROUP_GET_INFO, H5_REQUEST_NULL, 
                                   loc_params, grp_info)) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTGET, FAIL, "unable to get group info")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_info_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5Gclose
 *
 * Purpose:	Closes the specified group.  The group ID will no longer be
 *		valid for accessing the group.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Wednesday, December 31, 1997
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gclose(hid_t group_id)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "i", group_id);

    /* Check args */
    if(NULL == H5I_object_verify(group_id,H5I_GROUP))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a group")

    /*
     * Decrement the counter on the group atom.	 It will be freed if the count
     * reaches zero.
     */
    if(H5I_dec_app_ref(group_id) < 0)
    	HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close group")
#if 0
    /* Close the group through the VOL */
    if(H5VL_group_close(group_id, H5_REQUEST_NULL) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close group")
#endif

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Gclose() */


/*-------------------------------------------------------------------------
 * Function:	H5G_close_group
 *
 * Purpose:	Called when the ref count reaches zero on the group_id
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Mohamad Chaarawi
 *              June 2012
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_close_group(void *grp, H5VL_t *vol_plugin)
{
    herr_t              ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Close the group through the VOL*/
    if((ret_value = H5VL_group_close(grp, vol_plugin, H5_REQUEST_NULL)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to close group")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_close_group() */