summaryrefslogtreecommitdiffstats
path: root/test/use_common.c
blob: a58f8db72c432c947b1ca76bb88b37fa4662d9dd (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "h5test.h"

/* This test uses many POSIX things that are not available on
 * Windows.
 */
#ifdef H5_HAVE_UNISTD_H

#include "use.h"

/* ----------------------------------------------------------------------------
 * Print a common/shared usage message.
 * Receives program name to show default test file name (<program_name>.h5).
 * ----------------------------------------------------------------------------
 */
void
usage(const char *prog)
{
    fprintf(stderr, "usage: %s [OPTIONS]\n", prog);
    fprintf(stderr, "  OPTIONS\n");
    fprintf(stderr, "     -h, --help            Print a usage message and exit\n");
    fprintf(stderr, "     -f FN                 Test file name [default: %s.h5]\n", prog);
    fprintf(stderr,
            "     -i N, --iteration=N   Number of iterations to repeat the whole thing. [default: 1]\n");
    fprintf(stderr, "     -l w|r                launch writer or reader only. [default: launch both]\n");
    fprintf(stderr, "     -n N, --nplanes=N     Number of planes to write/read. [default: 1000]\n");
    fprintf(stderr, "     -s N, --swmr=N        Use SWMR mode (0: no, non-0: yes) default is yes\n");
    fprintf(stderr, "     -z N, --chunksize=N   Chunk size [default: %d]\n", Chunksize_DFT);
    fprintf(stderr, "     -y N, --chunkplanes=N Number of planes per chunk [default: 1]\n");
    fprintf(stderr, "\n");
} /* end usage() */

/* ----------------------------------------------------------------------------
 * Setup Use Case parameters by parsing command line options.
 * Includes default values for unspecified options.
 * ----------------------------------------------------------------------------
 */
int
parse_option(int argc, char *const argv[], options_t *opts)
{
    int ret_value = 0;
    int c;
    int use_swmr; /* Need an int to detect errors */

    /* command line options: See function usage for a description */
    const char *nagg_options = "f:hi:l:n:s:y:z:";

    /* suppress getopt from printing error */
    opterr = 0;

    while (1) {
        c = getopt(argc, argv, nagg_options);
        if (-1 == c)
            break;
        switch (c) {
            case 'h':
                usage(opts->progname);
                exit(EXIT_SUCCESS);
                break;
            case 'f': /* usecase data file name */
                opts->filename = HDstrdup(optarg);
                break;
            case 'i': /* iterations */
                if ((opts->iterations = atoi(optarg)) <= 0) {
                    fprintf(stderr, "bad iterations number %s, must be a positive integer\n", optarg);
                    usage(opts->progname);
                    Hgoto_error(-1);
                }
                break;
            case 'l': /* launch reader or writer only */
                switch (*optarg) {
                    case 'r': /* reader only */
                        opts->launch = UC_READER;
                        break;
                    case 'w': /* writer only */
                        opts->launch = UC_WRITER;
                        break;
                    default:
                        fprintf(stderr, "launch value(%c) should be w or r only.\n", *optarg);
                        usage(opts->progname);
                        Hgoto_error(-1);
                        break;
                } /* end switch (reader/writer-only mode toggle) */
                break;
            case 'n': /* number of planes to write/read */
                if ((opts->nplanes = strtoul(optarg, NULL, 0)) <= 0) {
                    fprintf(stderr, "bad number of planes %s, must be a positive integer\n", optarg);
                    usage(opts->progname);
                    Hgoto_error(-1);
                }
                break;
            case 's': /* use swmr file open mode */
                use_swmr = atoi(optarg);
                if (use_swmr != 0 && use_swmr != 1) {
                    fprintf(stderr, "swmr value should be 0(no) or 1(yes)\n");
                    usage(opts->progname);
                    Hgoto_error(-1);
                }
                opts->use_swmr = (bool)use_swmr;
                break;
            case 'y': /* Number of planes per chunk */
                if ((opts->chunkplanes = strtoul(optarg, NULL, 0)) <= 0) {
                    fprintf(stderr, "bad number of planes per chunk %s, must be a positive integer\n",
                            optarg);
                    usage(opts->progname);
                    Hgoto_error(-1);
                }
                break;
            case 'z': /* size of chunk=(z,z) */
                if ((opts->chunksize = strtoull(optarg, NULL, 0)) <= 0) {
                    fprintf(stderr, "bad chunksize %s, must be a positive integer\n", optarg);
                    usage(opts->progname);
                    Hgoto_error(-1);
                }
                break;
            case '?':
                fprintf(stderr, "getopt returned '%c'.\n", c);
                Hgoto_error(-1);
            default:
                fprintf(stderr, "getopt returned unexpected value.\n");
                fprintf(stderr, "Unexpected value is %d\n", c);
                Hgoto_error(-1);
        } /* end switch (argument symbol) */
    }     /* end while (there are still arguments) */

    /* set test file name if not given */
    if (!opts->filename) {
        /* default data file name is <progname>.h5 */
        if ((opts->filename = (char *)malloc(HDstrlen(opts->progname) + 4)) == NULL) {
            fprintf(stderr, "malloc: failed\n");
            Hgoto_error(-1);
        }
        HDstrcpy(opts->filename, opts->progname);
        HDstrcat(opts->filename, ".h5");
    }

done:
    return (ret_value);
} /* end parse_option() */

/* ----------------------------------------------------------------------------
 * Show parameters used for this use case.
 * ----------------------------------------------------------------------------
 */
void
show_parameters(options_t *opts)
{
    printf("===Parameters used:===\n");
    printf("chunk dims=(%llu, %llu, %llu)\n", (unsigned long long)opts->chunkdims[0],
           (unsigned long long)opts->chunkdims[1], (unsigned long long)opts->chunkdims[2]);
    printf("dataset max dims=(%llu, %llu, %llu)\n", (unsigned long long)opts->max_dims[0],
           (unsigned long long)opts->max_dims[1], (unsigned long long)opts->max_dims[2]);
    printf("number of planes to write=%llu\n", (unsigned long long)opts->nplanes);
    printf("using SWMR mode=%s\n", opts->use_swmr ? "yes(1)" : "no(0)");
    printf("data filename=%s\n", opts->filename);
    printf("launch part=");
    switch (opts->launch) {
        case UC_READWRITE:
            printf("Reader/Writer\n");
            break;
        case UC_WRITER:
            printf("Writer\n");
            break;
        case UC_READER:
            printf("Reader\n");
            break;
        default:
            /* should not happen */
            printf("Illegal part(%d)\n", opts->launch);
    }
    printf("number of iterations=%d (not used yet)\n", opts->iterations);
    printf("===Parameters shown===\n");
} /* end show_parameters() */

/* ----------------------------------------------------------------------------
 * Create the skeleton use case file for testing.
 * It has one 3d dataset using chunked storage.
 * The dataset is (unlimited, chunksize, chunksize).
 * Dataset type is 2 bytes integer.
 * It starts out "empty", i.e., first dimension is 0.
 *
 * Return: 0 succeed; -1 fail.
 * ----------------------------------------------------------------------------
 */
int
create_uc_file(options_t *opts)
{
    hsize_t           dims[3];  /* Dataset starting dimensions */
    hid_t             fid;      /* File ID for new HDF5 file */
    hid_t             dcpl;     /* Dataset creation property list */
    hid_t             sid;      /* Dataspace ID */
    hid_t             dsid;     /* Dataset ID */
    H5D_chunk_index_t idx_type; /* Chunk index type */

    if ((fid = H5Fcreate(opts->filename, H5F_ACC_TRUNC, H5P_DEFAULT, opts->fapl_id)) < 0)
        return -1;

    /* Set up dimension sizes */
    dims[0] = 0;
    dims[1] = dims[2] = opts->max_dims[1];

    /* Create dataspace for creating datasets */
    if ((sid = H5Screate_simple(3, dims, opts->max_dims)) < 0)
        return -1;

    /* Create dataset creation property list */
    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
        return -1;
    if (H5Pset_chunk(dcpl, 3, opts->chunkdims) < 0)
        return -1;

    /* create dataset of progname */
    if ((dsid = H5Dcreate2(fid, opts->progname, UC_DATATYPE, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
        return -1;

    /* Check that the chunk index type is not version 1 B-tree.
     * Version 1 B-trees are not supported under SWMR.
     */
    if (H5Dget_chunk_index_type(dsid, &idx_type) < 0)
        return -1;
    if (idx_type == H5D_CHUNK_IDX_BTREE) {
        fprintf(stderr, "ERROR: Chunk index is version 1 B-tree: aborting.\n");
        return -1;
    }

    /* Close everything */
    if (H5Dclose(dsid) < 0)
        return -1;
    if (H5Pclose(dcpl) < 0)
        return -1;
    if (H5Sclose(sid) < 0)
        return -1;
    if (H5Fclose(fid) < 0)
        return -1;

    return 0;
} /* end create_uc_file() */

/* ----------------------------------------------------------------------------
 * Append planes, each of (1,2*chunksize,2*chunksize) to the dataset.
 * In other words, 4 chunks are appended to the dataset at a time.
 * Fill each plan with the plane number and then write it at the nth plane.
 * Increase the plane number and repeat till the end of dataset, when it
 * reaches chunksize long. End product is a (2*chunksize)^3 cube.
 *
 * Return: 0 succeed; -1 fail.
 * ----------------------------------------------------------------------------
 */
int
write_uc_file(bool tosend, hid_t file_id, options_t *opts)
{
    hid_t     dsid;                           /* dataset ID */
    hid_t     dcpl;                           /* Dataset creation property list */
    UC_CTYPE *buffer, *bufptr;                /* data buffer */
    hsize_t   cz = opts->chunksize;           /* Chunk size */
    hid_t     f_sid;                          /* dataset file space id */
    hid_t     m_sid;                          /* memory space id */
    int       rank;                           /* rank */
    hsize_t   chunk_dims[3];                  /* Chunk dimensions */
    hsize_t   dims[3];                        /* Dataspace dimensions */
    hsize_t   memdims[3];                     /* Memory space dimensions */
    hsize_t   start[3] = {0, 0, 0}, count[3]; /* Hyperslab selection values */
    hsize_t   i, j, k;

    if (true == tosend) {
        /* Send a message that H5Fopen is complete--releasing the file lock */
        h5_send_message(WRITER_MESSAGE, NULL, NULL);
    }

    /* Open the dataset of the program name */
    if ((dsid = H5Dopen2(file_id, opts->progname, H5P_DEFAULT)) < 0) {
        fprintf(stderr, "H5Dopen2 failed\n");
        return -1;
    }

    /* Find chunksize used */
    if ((dcpl = H5Dget_create_plist(dsid)) < 0) {
        fprintf(stderr, "H5Dget_create_plist failed\n");
        return -1;
    }
    if (H5D_CHUNKED != H5Pget_layout(dcpl)) {
        fprintf(stderr, "storage layout is not chunked\n");
        return -1;
    }
    if ((rank = H5Pget_chunk(dcpl, 3, chunk_dims)) != 3) {
        fprintf(stderr, "storage rank is not 3\n");
        return -1;
    }

    /* verify chunk_dims against set parameters */
    if (chunk_dims[0] != opts->chunkdims[0] || chunk_dims[1] != cz || chunk_dims[2] != cz) {
        fprintf(stderr, "chunk size is not as expected. Got dims=(%llu,%llu,%llu)\n",
                (unsigned long long)chunk_dims[0], (unsigned long long)chunk_dims[1],
                (unsigned long long)chunk_dims[2]);
        return -1;
    }

    /* allocate space for data buffer 1 X dims[1] X dims[2] of UC_CTYPE */
    memdims[0] = 1;
    memdims[1] = opts->dims[1];
    memdims[2] = opts->dims[2];
    if ((buffer = (UC_CTYPE *)malloc((size_t)memdims[1] * (size_t)memdims[2] * sizeof(UC_CTYPE))) == NULL) {
        fprintf(stderr, "malloc: failed\n");
        return -1;
    }

    /*
     * Get dataset rank and dimension.
     */
    f_sid = H5Dget_space(dsid); /* Get filespace handle first. */
    rank  = H5Sget_simple_extent_ndims(f_sid);
    if (rank != UC_RANK) {
        fprintf(stderr, "rank(%d) of dataset does not match\n", rank);
        free(buffer);
        return -1;
    }
    if (H5Sget_simple_extent_dims(f_sid, dims, NULL) < 0) {
        fprintf(stderr, "H5Sget_simple_extent_dims got error\n");
        free(buffer);
        return -1;
    }
    printf("dataset rank %d, dimensions %llu x %llu x %llu\n", rank, (unsigned long long)(dims[0]),
           (unsigned long long)(dims[1]), (unsigned long long)(dims[2]));
    /* verify that file space dims are as expected and are consistent with memory space dims */
    if (dims[0] != 0 || dims[1] != memdims[1] || dims[2] != memdims[2]) {
        fprintf(stderr, "dataset is not empty. Got dims=(%llu,%llu,%llu)\n", (unsigned long long)dims[0],
                (unsigned long long)dims[1], (unsigned long long)dims[2]);
        free(buffer);
        return -1;
    }

    /* setup mem-space for buffer */
    if ((m_sid = H5Screate_simple(rank, memdims, NULL)) < 0) {
        fprintf(stderr, "H5Screate_simple for memory failed\n");
        free(buffer);
        return -1;
    }

    /* write planes */
    count[0] = 1;
    count[1] = dims[1];
    count[2] = dims[2];
    for (i = 0; i < opts->nplanes; i++) {
        /* fill buffer with value i+1 */
        bufptr = buffer;
        for (j = 0; j < dims[1]; j++) {
            for (k = 0; k < dims[2]; k++) {
                *bufptr++ = (UC_CTYPE)i;
            }
        }

        /* Cork the dataset's metadata in the cache, if SWMR is enabled */
        if (opts->use_swmr) {
            if (H5Odisable_mdc_flushes(dsid) < 0) {
                fprintf(stderr, "H5Odisable_mdc_flushes failed\n");
                free(buffer);
                return -1;
            }
        }

        /* extend the dataset by one for new plane */
        dims[0] = i + 1;
        if (H5Dset_extent(dsid, dims) < 0) {
            fprintf(stderr, "H5Dset_extent failed\n");
            free(buffer);
            return -1;
        }

        /* Get the dataset's dataspace */
        if ((f_sid = H5Dget_space(dsid)) < 0) {
            fprintf(stderr, "H5Dset_extent failed\n");
            free(buffer);
            return -1;
        }

        start[0] = i;
        /* Choose the next plane to write */
        if (H5Sselect_hyperslab(f_sid, H5S_SELECT_SET, start, NULL, count, NULL) < 0) {
            fprintf(stderr, "Failed H5Sselect_hyperslab\n");
            free(buffer);
            return -1;
        }

        /* Write plane to the dataset */
        if (H5Dwrite(dsid, UC_DATATYPE, m_sid, f_sid, H5P_DEFAULT, buffer) < 0) {
            fprintf(stderr, "Failed H5Dwrite\n");
            free(buffer);
            return -1;
        }

        /* Uncork the dataset's metadata from the cache, if SWMR is enabled */
        if (opts->use_swmr) {
            if (H5Oenable_mdc_flushes(dsid) < 0) {
                fprintf(stderr, "H5Oenable_mdc_flushes failed\n");
                free(buffer);
                return -1;
            }
        }

        /* flush file to make the just written plane available. */
        if (H5Dflush(dsid) < 0) {
            fprintf(stderr, "Failed to H5Fflush file\n");
            free(buffer);
            return -1;
        }
    } /* end for each plane to write */

    /* Done writing. Free/Close all resources including data file */
    free(buffer);
    if (H5Dclose(dsid) < 0) {
        fprintf(stderr, "Failed to close datasete\n");
        return -1;
    }
    if (H5Sclose(m_sid) < 0) {
        fprintf(stderr, "Failed to close memory space\n");
        return -1;
    }
    if (H5Sclose(f_sid) < 0) {
        fprintf(stderr, "Failed to close file space\n");
        return -1;
    }

    return 0;
} /* end write_uc_file() */

/* ----------------------------------------------------------------------------
 * Read planes from the dataset.
 * It expects the dataset is being changed (growing).
 * It checks the unlimited dimension (1st one). When it increases,
 * it will read in the new planes, one by one, and verify the data correctness.
 * (The nth plan should contain all "n".)
 * When the unlimited dimension grows to the chunksize (it becomes a cube),
 * that is the expected end of data, the reader exits.
 *
 * Return: 0 succeed; -1 fail.
 * ----------------------------------------------------------------------------
 */
int
read_uc_file(bool towait, options_t *opts)
{
    hid_t     fid;                            /* File ID for new HDF5 file */
    hid_t     dsid;                           /* dataset ID */
    UC_CTYPE *buffer = NULL, *bufptr = NULL;  /* read data buffer */
    hid_t     f_sid;                          /* dataset file space id */
    hid_t     m_sid;                          /* memory space id */
    int       rank;                           /* rank */
    hsize_t   dims[3];                        /* Dataspace dimensions */
    hsize_t   memdims[3];                     /* Memory space dimensions */
    hsize_t   nplane = 0, nplanes_seen = 0;   /* nth plane, last nth plane */
    hsize_t   start[3] = {0, 0, 0}, count[3]; /* Hyperslab selection values */
    hsize_t   j, k;
    int       nreadererr = 0;
    int       nerrs;
    int       loops_waiting_for_plane;

    /* Before reading, wait for the message that H5Fopen is complete--file lock is released */
    if (towait && h5_wait_message(WRITER_MESSAGE) < 0) {
        fprintf(stderr, "Cannot find writer message file...failed\n");
        return -1;
    }

    fprintf(stderr, "Opening to read %s\n", opts->filename);
    if ((fid = H5Fopen(opts->filename, H5F_ACC_RDONLY | (opts->use_swmr ? H5F_ACC_SWMR_READ : 0),
                       opts->fapl_id)) < 0) {
        fprintf(stderr, "H5Fopen failed\n");
        return -1;
    }

    if ((dsid = H5Dopen2(fid, opts->progname, H5P_DEFAULT)) < 0) {
        fprintf(stderr, "H5Dopen2 failed\n");
        return -1;
    }

    /* Allocate space for data buffer 1 X dims[1] X dims[2] of UC_CTYPE */
    memdims[0] = 1;
    memdims[1] = opts->dims[1];
    memdims[2] = opts->dims[2];
    if ((buffer = (UC_CTYPE *)malloc((size_t)memdims[1] * (size_t)memdims[2] * sizeof(UC_CTYPE))) == NULL) {
        fprintf(stderr, "malloc: failed\n");
        return -1;
    }

    /*
     * Get dataset rank and dimension.
     * Verify dimension is as expected (unlimited,2*chunksize,2*chunksize).
     */
    f_sid = H5Dget_space(dsid); /* Get filespace handle first. */
    rank  = H5Sget_simple_extent_ndims(f_sid);
    if (rank != UC_RANK) {
        fprintf(stderr, "rank(%d) of dataset does not match\n", rank);
        free(buffer);
        return -1;
    }
    if (H5Sget_simple_extent_dims(f_sid, dims, NULL) < 0) {
        fprintf(stderr, "H5Sget_simple_extent_dims got error\n");
        free(buffer);
        return -1;
    }
    printf("dataset rank %d, dimensions %llu x %llu x %llu\n", rank, (unsigned long long)(dims[0]),
           (unsigned long long)(dims[1]), (unsigned long long)(dims[2]));
    /* verify that file space dims are as expected and are consistent with memory space dims */
    if (dims[1] != memdims[1] || dims[2] != memdims[2]) {
        fprintf(stderr, "dataset dimension is not as expected. Got dims=(%llu,%llu,%llu)\n",
                (unsigned long long)dims[0], (unsigned long long)dims[1], (unsigned long long)dims[2]);
        fprintf(stderr, "But memdims=(%llu,%llu,%llu)\n", (unsigned long long)memdims[0],
                (unsigned long long)memdims[1], (unsigned long long)memdims[2]);
        free(buffer);
        return -1;
    }

    /* Setup mem-space for buffer */
    if ((m_sid = H5Screate_simple(rank, memdims, NULL)) < 0) {
        fprintf(stderr, "H5Screate_simple for memory failed\n");
        free(buffer);
        return -1;
    }

    /* Read 1 plane at a time whenever the dataset grows larger (along dim[0]) */
    count[0] = 1;
    count[1] = dims[1];
    count[2] = dims[2];
    /* quit when all nplanes  have been read */
    loops_waiting_for_plane = 0;
    while (nplanes_seen < opts->nplanes) {
        /* print progress message according to if new planes are available */
        if (nplanes_seen < dims[0]) {
            if (loops_waiting_for_plane) {
                /* end the previous message */
                printf("\n");
                loops_waiting_for_plane = 0;
            }
            printf("reading planes %llu to %llu\n", (unsigned long long)nplanes_seen,
                   (unsigned long long)dims[0]);
        }
        else {
            if (loops_waiting_for_plane) {
                printf(".");
                if (loops_waiting_for_plane >= 30) {
                    fprintf(stderr, "waited too long for new plane, quit.\n");
                    free(buffer);
                    return -1;
                }
            }
            else {
                /* print mesg only the first time; dots still no new plane */
                printf("waiting for new planes to read ");
            }
            loops_waiting_for_plane++;
            /* pause for a second */
            HDsleep(1);
        }

        for (nplane = nplanes_seen; nplane < dims[0]; nplane++) {
            /* read planes between last old nplanes and current extent */
            /* Get the dataset's dataspace */
            if ((f_sid = H5Dget_space(dsid)) < 0) {
                fprintf(stderr, "H5Dget_space failed\n");
                free(buffer);
                return -1;
            }

            start[0] = nplane;
            /* Choose the next plane to read */
            if (H5Sselect_hyperslab(f_sid, H5S_SELECT_SET, start, NULL, count, NULL) < 0) {
                fprintf(stderr, "H5Sselect_hyperslab failed\n");
                free(buffer);
                return -1;
            }

            /* Read the plane from the dataset */
            if (H5Dread(dsid, UC_DATATYPE, m_sid, f_sid, H5P_DEFAULT, buffer) < 0) {
                fprintf(stderr, "H5Dread failed\n");
                free(buffer);
                return -1;
            }

            /* compare read data with expected data value which is nplane */
            bufptr = buffer;
            nerrs  = 0;
            for (j = 0; j < dims[1]; j++) {
                for (k = 0; k < dims[2]; k++) {
                    if ((hsize_t)*bufptr++ != nplane) {
                        if (++nerrs < ErrorReportMax) {
                            fprintf(stderr, "found error %llu plane(%llu,%llu), expected %llu, got %d\n",
                                    (unsigned long long)nplane, (unsigned long long)j, (unsigned long long)k,
                                    (unsigned long long)nplane, (int)*(bufptr - 1));
                        } /* end if should print error */
                    }     /* end if value mismatch */
                }         /* end for plane second dimension */
            }             /* end for plane first dimension */
            if (nerrs) {
                nreadererr++;
                fprintf(stderr, "found %d unexpected values in plane %llu\n", nerrs,
                        (unsigned long long)nplane);
            }
        } /* end for each plane added since last read */

        nplanes_seen = dims[0];

        /* check if dataset has grown since last time (update dims) */
        H5Drefresh(dsid);
        f_sid = H5Dget_space(dsid); /* Get filespace handle first. */
        if (H5Sget_simple_extent_dims(f_sid, dims, NULL) < 0) {
            fprintf(stderr, "H5Sget_simple_extent_dims got error\n");
            free(buffer);
            return -1;
        }
    } /* end while (expecting more planes to read) */

    if (H5Fclose(fid) < 0) {
        fprintf(stderr, "H5Fclose failed\n");
        free(buffer);
        return -1;
    }

    free(buffer);

    if (nreadererr)
        return -1;
    else
        return 0;
} /* end read_uc_file() */

#endif /* H5_HAVE_UNISTD_H */