summaryrefslogtreecommitdiffstats
path: root/src/H5PL.c
blob: def41d193549487e1027fba8ea3d6c71230cb723 (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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 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.            *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

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

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5PL__init_interface


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5PLprivate.h"	/* Plugin       			*/
#include "H5Zprivate.h"		/* Filter pipeline			*/


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

#define H5PL_MAX_PATH_NUM       16

/****************************/
/* Macros for supporting 
 * both Windows and Unix */
/****************************/
/* Windows support */
#ifdef H5_HAVE_WIN32_API

#define H5PL_DEFAULT_PATH       "%ALLUSERSPROFILE%/hdf5/lib/plugin"
#define H5PL_PATH_SEPARATOR     ";"

/* Handle for dynamic library */
#define H5PL_HANDLE HINSTANCE

/* Get a handle to a plugin library.  Windows: TEXT macro handles Unicode strings */
#define H5PL_OPEN_DLIB(S) LoadLibraryEx(TEXT(S), NULL, LOAD_WITH_ALTERED_SEARCH_PATH)

/* Get the address of a symbol in dynamic library */
#define H5PL_GET_LIB_FUNC(H,N) GetProcAddress(H,N)

/* Close dynamic library */
#define H5PL_CLOSE_LIB(H) FreeLibrary(H)

/* Clear error - nothing to do */
#define H5PL_CLR_ERROR

typedef const void *(__cdecl *H5PL_get_plugin_info_t)(void);

/* Unix support */
#else /* H5_HAVE_WIN32_API */

#define H5PL_DEFAULT_PATH       "/usr/local/hdf5/lib/plugin"
#define H5PL_PATH_SEPARATOR     ":"

/* Handle for dynamic library */
#define H5PL_HANDLE void *

/* Get a handle to a plugin library.  Windows: TEXT macro handles Unicode strings */
#define H5PL_OPEN_DLIB(S) dlopen(S, RTLD_NOW)

/* Get the address of a symbol in dynamic library */
#define H5PL_GET_LIB_FUNC(H,N) dlsym(H,N)

/* Close dynamic library */
#define H5PL_CLOSE_LIB(H) dlclose(H)

/* Clear error */
#define H5PL_CLR_ERROR dlerror()

typedef const void *(*H5PL_get_plugin_info_t)(void);
#endif /* H5_HAVE_WIN32_API */

/* Special symbol to indicate no plugin loading */
#define H5PL_NO_PLUGIN          "::"

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

/* Type for the list of info for opened plugin libraries */
typedef struct H5PL_table_t {
    H5PL_type_t pl_type;			/* plugin type	     */
    int         pl_id;                          /* ID for the plugin */
    H5PL_HANDLE handle;			/* plugin handle     */
} H5PL_table_t;


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

static herr_t H5PL__init_path_table(void);
static htri_t H5PL__find(H5PL_type_t plugin_type, int type_id, char *dir, const void **info);
static htri_t H5PL__open(H5PL_type_t pl_type, char *libname, int plugin_id, const void **pl_info);
static htri_t H5PL__search_table(H5PL_type_t plugin_type, int type_id, const void **info);
static herr_t H5PL__close(H5PL_HANDLE handle);


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


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


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

/* Table for opened plugin libraries */
static size_t		H5PL_table_alloc_g = 0;
static size_t		H5PL_table_used_g = 0;
static H5PL_table_t     *H5PL_table_g = NULL;

/* Table of location paths for plugin libraries */
static char             *H5PL_path_table_g[H5PL_MAX_PATH_NUM];
static size_t           H5PL_num_paths_g = 0;
static hbool_t          H5PL_path_found_g = FALSE;

/* Whether to preload pathnames for plugin libraries */
static hbool_t          H5PL_no_plugin_g = FALSE;


/*--------------------------------------------------------------------------
NAME
   H5PL__init_interface -- Initialize interface-specific information
USAGE
    herr_t H5PL__init_interface()
RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.

--------------------------------------------------------------------------*/
static herr_t
H5PL__init_interface(void)
{
    char        *preload_path;

    FUNC_ENTER_STATIC_NOERR

    /* Retrieve pathnames from HDF5_PLUGIN_PRELOAD if the user sets it
     * to tell the library to load plugin libraries without search.
     */
    if(NULL != (preload_path = HDgetenv("HDF5_PLUGIN_PRELOAD"))) {
        /* Special symbal "::" means no plugin during data reading. */
        if(!HDstrcmp(preload_path, H5PL_NO_PLUGIN))
            H5PL_no_plugin_g = TRUE;
    } /* end if */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5PL__init_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5PL_no_plugin
 *
 * Purpose:	Quick way for filter module to query whether to load plugin 
 *
 * Return:	TRUE:	No plugin loading during data reading
 *
 * 		FALSE:	Load plugin during data reading
 *
 * Programmer:	Raymond Lu
 *              20 February 2013
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5PL_no_plugin(void)
{
    htri_t ret_value;

    FUNC_ENTER_NOAPI(FAIL)

    ret_value = (htri_t)H5PL_no_plugin_g;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL_no_plugin() */


/*-------------------------------------------------------------------------
 * Function:	H5PL_term_interface
 *
 * Purpose:	Terminate the H5PL interface: release all memory, reset all
 *		global variables to initial values. This only happens if all
 *		types have been destroyed from other interfaces.
 *
 * Return:	Success:	Positive if any action was taken that might
 *				affect some other interface; zero otherwise.
 *
 * 		Failure:	Negative.
 *
 * Programmer:	Raymond Lu
 *              20 February 2013
 *
 *-------------------------------------------------------------------------
 */
int
H5PL_term_interface(void)
{
    int  i = 0;
    
    FUNC_ENTER_NOAPI_NOINIT_NOERR

    if(H5_interface_initialize_g) {
        size_t u;       /* Local index variable */

	/* Close opened dynamic libraries */
        for(u = 0; u < H5PL_table_used_g; u++)
            H5PL__close((H5PL_table_g[u]).handle);

	/* Free the table of dynamic libraries */
	H5PL_table_g = (H5PL_table_t *)H5MM_xfree(H5PL_table_g);
	H5PL_table_used_g = H5PL_table_alloc_g = 0;

        /* Free the table of search paths */
        for(u = 0; u < H5PL_num_paths_g; u++)
            if(H5PL_path_table_g[u])
                H5PL_path_table_g[u] = (char *)H5MM_xfree(H5PL_path_table_g[u]);
        H5PL_num_paths_g = 0;
        H5PL_path_found_g = FALSE;

	H5_interface_initialize_g = 0;
        i = 1;
    } /* end if */

    FUNC_LEAVE_NOAPI(i)
} /* end H5PL_term_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5PL_load
 *
 * Purpose:	Given the plugin type and identifier, this function searches
 *              and/or loads a dynamic plugin library first among the already
 *              opened libraries then in the designated location paths.
 *
 * Return:	Non-NULL on success/NULL on failure
 *
 * Programmer:	Raymond Lu
 *              13 February 2013
 *
 *-------------------------------------------------------------------------
 */
const void *
H5PL_load(H5PL_type_t type, int id)
{
    htri_t      found;               /* Whether the plugin was found */
    const void  *plugin_info = NULL;
    const void  *ret_value = NULL;

    FUNC_ENTER_NOAPI(NULL)

    /* Initialize the location paths for dynamic libraries, if they aren't
     * already set up.
     */
    if(FALSE == H5PL_path_found_g)
        if(H5PL__init_path_table() < 0)
            HGOTO_ERROR(H5E_PLUGIN, H5E_CANTINIT, NULL, "can't initialize search path table")

    /* Search in the table of already loaded plugin libraries */
    if((found = H5PL__search_table(type, id, &plugin_info)) < 0)
        HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, NULL, "search in table failed")

    /* If not found, iterate through the path table to find the right dynamic library */
    if(!found) {
        size_t	   i;                   /* Local index variable */

        for(i = 0; i < H5PL_num_paths_g; i++) {
            if((found = H5PL__find(type, id, H5PL_path_table_g[i], &plugin_info)) < 0)
                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, NULL, "search in paths failed")
     
            /* Break out if found */
            if(found) {
                HDassert(plugin_info);
                break;
            } /* end if */
        } /* end for */
    } /* end if */

    /* Check if we found the plugin */
    if(found)
        ret_value = plugin_info;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL_load() */


/*-------------------------------------------------------------------------
 * Function:	H5PL__init_path_table
 *
 * Purpose:	Initialize the path table.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *              18 March 2013
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5PL__init_path_table(void)
{
    char        *dl_path = NULL;
    char        *origin_dl_path;
    char        *dir;
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Retrieve paths from HDF5_PLUGIN_PATH if the user sets it
     * or from the default paths if it isn't set.
     */
    origin_dl_path = HDgetenv("HDF5_PLUGIN_PATH");
    if(NULL == origin_dl_path)
        dl_path = HDstrdup(H5PL_DEFAULT_PATH);
    else
        dl_path = HDstrdup(origin_dl_path);
    if(NULL == dl_path)
        HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't allocate memory for path")

    /* Put paths in the path table.  They are separated by ":" */
    dir = HDstrtok(dl_path, H5PL_PATH_SEPARATOR);
    while(dir) {
        /* Check for too many directories in path */
        if(H5PL_num_paths_g == H5PL_MAX_PATH_NUM)
            HGOTO_ERROR(H5E_PLUGIN, H5E_NOSPACE, FAIL, "too many directories in path for table")
        if(NULL == (H5PL_path_table_g[H5PL_num_paths_g] = HDstrdup(dir)))
            HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't allocate memory for path")
        H5PL_num_paths_g++;
        dir = HDstrtok(NULL, H5PL_PATH_SEPARATOR);
    } /* end while */

    H5PL_path_found_g = TRUE;

done:
    if(dl_path)
        dl_path = (char *)H5MM_xfree(dl_path);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL__init_path_table() */


/*-------------------------------------------------------------------------
 * Function:	H5PL__find
 *
 * Purpose:     Given a path, this function opens the directory and envokes
 *              another function to go through all files to find the right 
 *              plugin library. Two function definitions are for Unix and 
 *              Windows.
 *
 * Return:	TRUE on success, 
 *              FALSE on not found,
 *              negative on failure
 *
 * Programmer:	Raymond Lu
 *              13 February 2013
 *
 *-------------------------------------------------------------------------
 */
#ifndef H5_HAVE_WIN32_API
static htri_t
H5PL__find(H5PL_type_t plugin_type, int type_id, char *dir, const void **info)
{
    char           *pathname = NULL;
    DIR            *dirp = NULL;
    struct dirent  *dp;
    htri_t         ret_value = FALSE;

    FUNC_ENTER_STATIC

    /* Open the directory */  
    if(!(dirp = HDopendir(dir)))
        HGOTO_ERROR(H5E_PLUGIN, H5E_OPENERROR, FAIL, "can't open directory")

    /* Iterates through all entries in the directory to find the right plugin library */
    while(NULL != (dp = HDreaddir(dirp))) {
        /* The library we are looking for should be called libxxx.so... on Unix 
         * or libxxx.xxx.dylib on Mac.
         */ 
        if(!HDstrncmp(dp->d_name, "lib", (size_t)3) && 
                (HDstrstr(dp->d_name, ".so") || HDstrstr(dp->d_name, ".dylib"))) {
            h5_stat_t   my_stat;
            size_t      pathname_len;
            htri_t      found_in_dir;

            /* Allocate & initialize the path name */
            pathname_len = HDstrlen(dir) + HDstrlen(dp->d_name) + 2;
            if(NULL == (pathname = (char *)H5MM_malloc(pathname_len)))
                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't allocate memory for path")
            HDsnprintf(pathname, pathname_len, "%s/%s", dir, dp->d_name);

            /* Get info for directory entry */
            if(HDstat(pathname, &my_stat) == -1)
                HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't stat file: %s", HDstrerror(errno))

            /* If it is a directory, skip it */ 
            if(S_ISDIR(my_stat.st_mode))
                continue;

            /* Attempt to open the dynamic library as a filter library */
            if((found_in_dir = H5PL__open(plugin_type, pathname, type_id, info)) < 0)
                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "search in directory failed")
            if(found_in_dir) {
                /* Indicate success */
                HGOTO_DONE(TRUE)
            } /* end if */
            else
                HDassert(pathname);
                pathname = (char *)H5MM_xfree(pathname);
        } /* end if */
    } /* end while */

done:
    if(dirp) 
        if(HDclosedir(dirp) < 0)
            HDONE_ERROR(H5E_FILE, H5E_CLOSEERROR, FAIL, "can't close directory: %s", HDstrerror(errno))
    if(pathname) 
        pathname = (char *)H5MM_xfree(pathname);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL__find() */
#else /* H5_HAVE_WIN32_API */
static htri_t
H5PL__find(H5PL_type_t plugin_type, int type_id, char *dir, const void **info)
{
    WIN32_FIND_DATA fdFile;
    HANDLE          hFind;
    char           *pathname = NULL;
    char            service[2048];
    htri_t          ret_value = FALSE;

    FUNC_ENTER_STATIC

    /* Specify a file mask. *.* = We want everything! */
    sprintf(service, "%s\\*.dll", dir);
    if((hFind = FindFirstFile(service, &fdFile)) == INVALID_HANDLE_VALUE)
        HGOTO_ERROR(H5E_PLUGIN, H5E_OPENERROR, FAIL, "can't open directory")

    do {
        /* Find first file will always return "."
         * and ".." as the first two directories.
         */
        if(HDstrcmp(fdFile.cFileName, ".") != 0 && HDstrcmp(fdFile.cFileName, "..") != 0) {
            size_t      pathname_len;
            htri_t      found_in_dir;

            /* Allocate & initialize the path name */
            pathname_len = HDstrlen(dir) + HDstrlen(fdFile.cFileName) + 2;
	    if(NULL == (pathname = (char *)H5MM_malloc(pathname_len)))
                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't allocate memory for path")
            HDsnprintf(pathname, pathname_len, "%s\\%s", dir, fdFile.cFileName);

            /* Is the entity a File or Folder? */
            if(fdFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
                continue;

            if((found_in_dir = H5PL__open(plugin_type, pathname, type_id, info)) < 0)
                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "search in directory failed")
            if(found_in_dir) {
                /* Indicate success */
                HGOTO_DONE(TRUE)
            } /* end if */
            else
	        HDassert(pathname);
                pathname = (char *)H5MM_xfree(pathname);
        } /* end if */
    } while(FindNextFile(hFind, &fdFile)); /* Find the next file. */

done:
    if(hFind) 
        FindClose(hFind);
    if(pathname) 
        pathname = (char *)H5MM_xfree(pathname);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL__find() */
#endif /* H5_HAVE_WIN32_API */


/*-------------------------------------------------------------------------
 * Function:	H5PL__open
 *
 * Purpose:     Iterates through all files to find the right plugin library.
 *              It loads the dynamic plugin library and keeps it on the list 
 *              of loaded libraries. 	
 *
 * Return:	TRUE on success, 
 *              FALSE on not found,
 *              negative on failure
 *
 * Programmer:	Raymond Lu
 *              13 February 2013
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5PL__open(H5PL_type_t pl_type, char *libname, int pl_id, const void **pl_info)
{
    H5PL_HANDLE    handle = NULL;
    htri_t         ret_value = FALSE;

    FUNC_ENTER_STATIC

    /* There are different reasons why a library can't be open, e.g. wrong architecture.
     * simply continue if we can't open it.
     */
    if(NULL == (handle = H5PL_OPEN_DLIB(libname))) {
        H5PL_CLR_ERROR; /* clear error */
    } /* end if */
    else {
        H5PL_get_plugin_info_t get_plugin_info = NULL;

        /* Return a handle for the function H5PLget_plugin_info in the dynamic library.
         * The plugin library is suppose to define this function.
         */
        if(NULL == (get_plugin_info = (H5PL_get_plugin_info_t)H5PL_GET_LIB_FUNC(handle, "H5PLget_plugin_info"))) {
            if(H5PL__close(handle) < 0)
                HGOTO_ERROR(H5E_PLUGIN, H5E_CLOSEERROR, FAIL, "can't close dynamic library")
        } /* end if */
        else {
            const H5Z_class2_t *plugin_info;

            /* Invoke H5PLget_plugin_info to verify this is the right library we are looking for.
             * Move on if it isn't.
             */
            if(NULL == (plugin_info = (const H5Z_class2_t *)(*get_plugin_info)())) {
                if(H5PL__close(handle) < 0)
                    HGOTO_ERROR(H5E_PLUGIN, H5E_CLOSEERROR, FAIL, "can't close dynamic library")
                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "can't get plugin info")
            } /* end if */

            /* Successfully found plugin library, check if it's the right one */
            if(plugin_info->id == pl_id) {
                /* Expand the table if it is too small */
                if(H5PL_table_used_g >= H5PL_table_alloc_g) {
                    size_t n = MAX(H5Z_MAX_NFILTERS, 2 * H5PL_table_alloc_g);
                    H5PL_table_t *table = (H5PL_table_t *)H5MM_realloc(H5PL_table_g, n * sizeof(H5PL_table_t));

                    if(!table)
                        HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "unable to extend dynamic library table")

                    H5PL_table_g = table;
                    H5PL_table_alloc_g = n;
                } /* end if */

                (H5PL_table_g[H5PL_table_used_g]).handle = handle;
                (H5PL_table_g[H5PL_table_used_g]).pl_type = pl_type;
                (H5PL_table_g[H5PL_table_used_g]).pl_id = plugin_info->id;
                H5PL_table_used_g++;

                /* Set the plugin info to return */
                *pl_info = (const void *)plugin_info;
     
                /* Indicate success */
                ret_value = TRUE;
            } /* end if */
            else
                if(H5PL__close(handle) < 0)
                    HGOTO_ERROR(H5E_PLUGIN, H5E_CLOSEERROR, FAIL, "can't close dynamic library")
        } /* end if */
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL__open() */


/*-------------------------------------------------------------------------
 * Function:	H5PL__search_table
 *
 * Purpose:     Search in the list of already opened dynamic libraries
 *              to see if the one we are looking for is already opened.
 *
 * Return:	TRUE on success, 
 *              FALSE on not found,
 *              Negative on failure
 *
 * Programmer:	Raymond Lu
 *              13 February 2013
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5PL__search_table(H5PL_type_t plugin_type, int type_id, const void **info)
{
    htri_t         ret_value = FALSE;

    FUNC_ENTER_STATIC

    /* Search in the table of already opened dynamic libraries */
    if(H5PL_table_used_g > 0) {
        size_t         i;

        for(i = 0; i < H5PL_table_used_g; i++) {
            if((plugin_type == (H5PL_table_g[i]).pl_type) && (type_id == (H5PL_table_g[i]).pl_id)) {
                H5PL_get_plugin_info_t get_plugin_info;
                const H5Z_class2_t   *plugin_info;

                if(NULL == (get_plugin_info = (H5PL_get_plugin_info_t)H5PL_GET_LIB_FUNC((H5PL_table_g[i]).handle, "H5PLget_plugin_info")))
		    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't get function for H5PLget_plugin_info")

	        if(NULL == (plugin_info = (const H5Z_class2_t *)(*get_plugin_info)()))
		    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't get plugin info")

	        *info = plugin_info;
                HGOTO_DONE(TRUE)
            } /* end if */
        } /* end for */
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5PL__search_table() */


/*-------------------------------------------------------------------------
 * Function:	H5PL__close
 *
 * Purpose:     Closes the handle for dynamic library	
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Raymond Lu
 *              13 February 2013
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5PL__close(H5PL_HANDLE handle)
{
    FUNC_ENTER_STATIC_NOERR

    H5PL_CLOSE_LIB(handle);
   
    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5PL__close() */