src/rrd_dump.c

   1 /*****************************************************************************
   2  * RRDtool 1.3.2  Copyright by Tobi Oetiker, 1997-2008
   3  *****************************************************************************
   4  * rrd_dump  Display a RRD
   5  *****************************************************************************
   6  * $Id$
   7  * $Log$
   8  * Revision 1.7  2004/05/25 20:53:21  oetiker
   9  * prevent small leak when resources are exhausted -- Mike Slifcak
  10  *
  11  * Revision 1.6  2004/05/25 20:51:49  oetiker
  12  * Update displayed copyright messages to be consistent. -- Mike Slifcak
  13  *
  14  * Revision 1.5  2003/02/13 07:05:27  oetiker
  15  * Find attached the patch I promised to send to you. Please note that there
  16  * are three new source files (src/rrd_is_thread_safe.h, src/rrd_thread_safe.c
  17  * and src/rrd_not_thread_safe.c) and the introduction of librrd_th. This
  18  * library is identical to librrd, but it contains support code for per-thread
  19  * global variables currently used for error information only. This is similar
  20  * to how errno per-thread variables are implemented.  librrd_th must be linked
  21  * alongside of libpthred
  22  *
  23  * There is also a new file "THREADS", holding some documentation.
  24  *
  25  * -- Peter Stamfest <peter@stamfest.at>
  26  *
  27  * Revision 1.4  2002/02/01 20:34:49  oetiker
  28  * fixed version number and date/time
  29  *
  30  * Revision 1.3  2001/03/10 23:54:39  oetiker
  31  * Support for COMPUTE data sources (CDEF data sources). Removes the RPN
  32  * parser and calculator from rrd_graph and puts then in a new file,
  33  * rrd_rpncalc.c. Changes to core files rrd_create and rrd_update. Some
  34  * clean-up of aberrant behavior stuff, including a bug fix.
  35  * Documentation update (rrdcreate.pod, rrdupdate.pod). Change xml format.
  36  * -- Jake Brutlag <jakeb@corp.webtv.net>
  37  *
  38  * Revision 1.2  2001/03/04 13:01:55  oetiker
  39  *
  40  * Revision 1.1.1.1  2001/02/25 22:25:05  oetiker
  41  * checkin
  42  *
  43  *****************************************************************************/
  44 #include "rrd_tool.h"
  45 #include "rrd_rpncalc.h"
  46 #include "rrd_client.h"
  47
  48 #ifdef HAVE_LOCALE_H
  49 #include <locale.h>
  50 #endif
  51
  52
  53 #if !(defined(NETWARE) || defined(WIN32))
  54 extern char *tzname[2];
  55 #endif
  56
  57 static int rrd_dump_opt_r(
  58     const char *filename,
  59     char *outname,
  60     int opt_header)
  61 {
  62     unsigned int i, ii, ix, iii = 0;
  63     time_t    now;
  64     char      somestring[255];
  65     rrd_value_t my_cdp;
  66     off_t     rra_base, rra_start, rra_next;
  67     rrd_file_t *rrd_file;
  68     FILE     *out_file;
  69     rrd_t     rrd;
  70     rrd_value_t value;
  71     struct tm tm;
  72     char *old_locale = "";
  73
  74     rrd_init(&rrd);
  75     rrd_file = rrd_open(filename, &rrd, RRD_READONLY | RRD_READAHEAD);
  76     if (rrd_file == NULL) {
  77         rrd_free(&rrd);
  78         return (-1);
  79     }
  80
  81     out_file = NULL;
  82     if (outname) {
  83         if (!(out_file = fopen(outname, "w"))) {
  84             return (-1);
  85         }
  86     } else {
  87         out_file = stdout;
  88     }
  89 #ifdef HAVE_SETLOCALE
  90     old_locale = setlocale(LC_NUMERIC, "C");
  91 #endif
  92
  93     if (opt_header == 1) {
  94         fputs("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n", out_file);
  95         fputs
  96             ("<!DOCTYPE rrd SYSTEM \"http://oss.oetiker.ch/rrdtool/rrdtool.dtd\">\n",
  97              out_file);
  98         fputs("<!-- Round Robin Database Dump -->\n", out_file);
  99         fputs("<rrd>\n", out_file);
 100     } else if (opt_header == 2) {
 101         fputs("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n", out_file);
 102         fputs("<!-- Round Robin Database Dump -->\n", out_file);
 103         fputs("<rrd xmlns=\"http://oss.oetiker.ch/rrdtool/rrdtool-dump.xml\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n", out_file);
 104         fputs("\txsi:schemaLocation=\"http://oss.oetiker.ch/rrdtool/rrdtool-dump.xml http://oss.oetiker.ch/rrdtool/rrdtool-dump.xsd\">\n", out_file);
 105     } else {
 106         fputs("<!-- Round Robin Database Dump -->\n", out_file);
 107         fputs("<rrd>\n", out_file);
 108     }
 109
 110     if (atoi(rrd.stat_head->version) <= 3) {
 111         fprintf(out_file, "\t<version>%s</version>\n", RRD_VERSION3);
 112     } else {
 113         fprintf(out_file, "\t<version>%s</version>\n", RRD_VERSION);
 114     }
 115     fprintf(out_file, "\t<step>%lu</step> <!-- Seconds -->\n",
 116             rrd.stat_head->pdp_step);
 117 #ifdef HAVE_STRFTIME
 118     localtime_r(&rrd.live_head->last_up, &tm);
 119     strftime(somestring, 200, "%Y-%m-%d %H:%M:%S %Z", &tm);
 120 #else
 121 # error "Need strftime"
 122 #endif
 123     fprintf(out_file, "\t<lastupdate>%lld</lastupdate> <!-- %s -->\n\n",
 124             (long long) rrd.live_head->last_up, somestring);
 125     for (i = 0; i < rrd.stat_head->ds_cnt; i++) {
 126         fprintf(out_file, "\t<ds>\n");
 127         fprintf(out_file, "\t\t<name>%s</name>\n", rrd.ds_def[i].ds_nam);
 128         fprintf(out_file, "\t\t<type>%s</type>\n", rrd.ds_def[i].dst);
 129         if (dst_conv(rrd.ds_def[i].dst) != DST_CDEF) {
 130             fprintf(out_file,
 131                     "\t\t<minimal_heartbeat>%lu</minimal_heartbeat>\n",
 132                     rrd.ds_def[i].par[DS_mrhb_cnt].u_cnt);
 133             if (isnan(rrd.ds_def[i].par[DS_min_val].u_val)) {
 134                 fprintf(out_file, "\t\t<min>NaN</min>\n");
 135             } else {
 136                 fprintf(out_file, "\t\t<min>%0.10e</min>\n",
 137                         rrd.ds_def[i].par[DS_min_val].u_val);
 138             }
 139             if (isnan(rrd.ds_def[i].par[DS_max_val].u_val)) {
 140                 fprintf(out_file, "\t\t<max>NaN</max>\n");
 141             } else {
 142                 fprintf(out_file, "\t\t<max>%0.10e</max>\n",
 143                         rrd.ds_def[i].par[DS_max_val].u_val);
 144             }
 145         } else {        /* DST_CDEF */
 146             char     *str = NULL;
 147
 148             rpn_compact2str((rpn_cdefds_t *) &(rrd.ds_def[i].par[DS_cdef]),
 149                             rrd.ds_def, &str);
 150             fprintf(out_file, "\t\t<cdef>%s</cdef>\n", str);
 151             free(str);
 152         }
 153         fprintf(out_file, "\n\t\t<!-- PDP Status -->\n");
 154         fprintf(out_file, "\t\t<last_ds>%s</last_ds>\n",
 155                 rrd.pdp_prep[i].last_ds);
 156         if (isnan(rrd.pdp_prep[i].scratch[PDP_val].u_val)) {
 157             fprintf(out_file, "\t\t<value>NaN</value>\n");
 158         } else {
 159             fprintf(out_file, "\t\t<value>%0.10e</value>\n",
 160                     rrd.pdp_prep[i].scratch[PDP_val].u_val);
 161         }
 162         fprintf(out_file, "\t\t<unknown_sec>%lu</unknown_sec>\n",
 163                 rrd.pdp_prep[i].scratch[PDP_unkn_sec_cnt].u_cnt);
 164
 165         fprintf(out_file, "\t</ds>\n\n");
 166     }
 167
 168     fputs("<!-- Round Robin Archives -->\n", out_file);
 169
 170     rra_base = rrd_file->header_len;
 171     rra_next = rra_base;
 172
 173     for (i = 0; i < rrd.stat_head->rra_cnt; i++) {
 174
 175         long      timer = 0;
 176
 177         rra_start = rra_next;
 178         rra_next += (rrd.stat_head->ds_cnt
 179                      * rrd.rra_def[i].row_cnt * sizeof(rrd_value_t));
 180         fprintf(out_file, "\t<rra>\n");
 181         fprintf(out_file, "\t\t<cf>%s</cf>\n", rrd.rra_def[i].cf_nam);
 182         fprintf(out_file,
 183                 "\t\t<pdp_per_row>%lu</pdp_per_row> <!-- %lu seconds -->\n\n",
 184                 rrd.rra_def[i].pdp_cnt,
 185                 rrd.rra_def[i].pdp_cnt * rrd.stat_head->pdp_step);
 186         /* support for RRA parameters */
 187         fprintf(out_file, "\t\t<params>\n");
 188         switch (cf_conv(rrd.rra_def[i].cf_nam)) {
 189         case CF_HWPREDICT:
 190         case CF_MHWPREDICT:
 191             fprintf(out_file, "\t\t<hw_alpha>%0.10e</hw_alpha>\n",
 192                     rrd.rra_def[i].par[RRA_hw_alpha].u_val);
 193             fprintf(out_file, "\t\t<hw_beta>%0.10e</hw_beta>\n",
 194                     rrd.rra_def[i].par[RRA_hw_beta].u_val);
 195             fprintf(out_file,
 196                     "\t\t<dependent_rra_idx>%lu</dependent_rra_idx>\n",
 197                     rrd.rra_def[i].par[RRA_dependent_rra_idx].u_cnt);
 198             break;
 199         case CF_SEASONAL:
 200         case CF_DEVSEASONAL:
 201             fprintf(out_file,
 202                     "\t\t<seasonal_gamma>%0.10e</seasonal_gamma>\n",
 203                     rrd.rra_def[i].par[RRA_seasonal_gamma].u_val);
 204             fprintf(out_file,
 205                     "\t\t<seasonal_smooth_idx>%lu</seasonal_smooth_idx>\n",
 206                     rrd.rra_def[i].par[RRA_seasonal_smooth_idx].u_cnt);
 207             if (atoi(rrd.stat_head->version) >= 4) {
 208                 fprintf(out_file,
 209                         "\t\t<smoothing_window>%0.10e</smoothing_window>\n",
 210                         rrd.rra_def[i].par[RRA_seasonal_smoothing_window].
 211                         u_val);
 212             }
 213             fprintf(out_file,
 214                     "\t\t<dependent_rra_idx>%lu</dependent_rra_idx>\n",
 215                     rrd.rra_def[i].par[RRA_dependent_rra_idx].u_cnt);
 216             break;
 217         case CF_FAILURES:
 218             fprintf(out_file, "\t\t<delta_pos>%0.10e</delta_pos>\n",
 219                     rrd.rra_def[i].par[RRA_delta_pos].u_val);
 220             fprintf(out_file, "\t\t<delta_neg>%0.10e</delta_neg>\n",
 221                     rrd.rra_def[i].par[RRA_delta_neg].u_val);
 222             fprintf(out_file, "\t\t<window_len>%lu</window_len>\n",
 223                     rrd.rra_def[i].par[RRA_window_len].u_cnt);
 224             fprintf(out_file,
 225                     "\t\t<failure_threshold>%lu</failure_threshold>\n",
 226                     rrd.rra_def[i].par[RRA_failure_threshold].u_cnt);
 227             /* fall thru */
 228         case CF_DEVPREDICT:
 229             fprintf(out_file,
 230                     "\t\t<dependent_rra_idx>%lu</dependent_rra_idx>\n",
 231                     rrd.rra_def[i].par[RRA_dependent_rra_idx].u_cnt);
 232             break;
 233         case CF_AVERAGE:
 234         case CF_MAXIMUM:
 235         case CF_MINIMUM:
 236         case CF_LAST:
 237         default:
 238             fprintf(out_file, "\t\t<xff>%0.10e</xff>\n",
 239                     rrd.rra_def[i].par[RRA_cdp_xff_val].u_val);
 240             break;
 241         }
 242         fprintf(out_file, "\t\t</params>\n");
 243         fprintf(out_file, "\t\t<cdp_prep>\n");
 244         for (ii = 0; ii < rrd.stat_head->ds_cnt; ii++) {
 245             unsigned long ivalue;
 246
 247             fprintf(out_file, "\t\t\t<ds>\n");
 248             /* support for exporting all CDP parameters */
 249             /* parameters common to all CFs */
 250             /* primary_val and secondary_val do not need to be saved between updates
 251              * so strictly speaking they could be omitted.
 252              * However, they can be useful for diagnostic purposes, so are included here. */
 253             value = rrd.cdp_prep[i * rrd.stat_head->ds_cnt
 254                                  + ii].scratch[CDP_primary_val].u_val;
 255             if (isnan(value)) {
 256                 fprintf(out_file,
 257                         "\t\t\t<primary_value>NaN</primary_value>\n");
 258             } else {
 259                 fprintf(out_file,
 260                         "\t\t\t<primary_value>%0.10e</primary_value>\n",
 261                         value);
 262             }
 263             value =
 264                 rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 265                              ii].scratch[CDP_secondary_val].u_val;
 266             if (isnan(value)) {
 267                 fprintf(out_file,
 268                         "\t\t\t<secondary_value>NaN</secondary_value>\n");
 269             } else {
 270                 fprintf(out_file,
 271                         "\t\t\t<secondary_value>%0.10e</secondary_value>\n",
 272                         value);
 273             }
 274             switch (cf_conv(rrd.rra_def[i].cf_nam)) {
 275             case CF_HWPREDICT:
 276             case CF_MHWPREDICT:
 277                 value =
 278                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 279                                  ii].scratch[CDP_hw_intercept].u_val;
 280                 if (isnan(value)) {
 281                     fprintf(out_file, "\t\t\t<intercept>NaN</intercept>\n");
 282                 } else {
 283                     fprintf(out_file,
 284                             "\t\t\t<intercept>%0.10e</intercept>\n", value);
 285                 }
 286                 value =
 287                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 288                                  ii].scratch[CDP_hw_last_intercept].u_val;
 289                 if (isnan(value)) {
 290                     fprintf(out_file,
 291                             "\t\t\t<last_intercept>NaN</last_intercept>\n");
 292                 } else {
 293                     fprintf(out_file,
 294                             "\t\t\t<last_intercept>%0.10e</last_intercept>\n",
 295                             value);
 296                 }
 297                 value =
 298                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 299                                  ii].scratch[CDP_hw_slope].u_val;
 300                 if (isnan(value)) {
 301                     fprintf(out_file, "\t\t\t<slope>NaN</slope>\n");
 302                 } else {
 303                     fprintf(out_file, "\t\t\t<slope>%0.10e</slope>\n",
 304                             value);
 305                 }
 306                 value =
 307                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 308                                  ii].scratch[CDP_hw_last_slope].u_val;
 309                 if (isnan(value)) {
 310                     fprintf(out_file,
 311                             "\t\t\t<last_slope>NaN</last_slope>\n");
 312                 } else {
 313                     fprintf(out_file,
 314                             "\t\t\t<last_slope>%0.10e</last_slope>\n",
 315                             value);
 316                 }
 317                 ivalue =
 318                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 319                                  ii].scratch[CDP_null_count].u_cnt;
 320                 fprintf(out_file, "\t\t\t<nan_count>%lu</nan_count>\n",
 321                         ivalue);
 322                 ivalue =
 323                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 324                                  ii].scratch[CDP_last_null_count].u_cnt;
 325                 fprintf(out_file,
 326                         "\t\t\t<last_nan_count>%lu</last_nan_count>\n",
 327                         ivalue);
 328                 break;
 329             case CF_SEASONAL:
 330             case CF_DEVSEASONAL:
 331                 value =
 332                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 333                                  ii].scratch[CDP_hw_seasonal].u_val;
 334                 if (isnan(value)) {
 335                     fprintf(out_file, "\t\t\t<seasonal>NaN</seasonal>\n");
 336                 } else {
 337                     fprintf(out_file, "\t\t\t<seasonal>%0.10e</seasonal>\n",
 338                             value);
 339                 }
 340                 value =
 341                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 342                                  ii].scratch[CDP_hw_last_seasonal].u_val;
 343                 if (isnan(value)) {
 344                     fprintf(out_file,
 345                             "\t\t\t<last_seasonal>NaN</last_seasonal>\n");
 346                 } else {
 347                     fprintf(out_file,
 348                             "\t\t\t<last_seasonal>%0.10e</last_seasonal>\n",
 349                             value);
 350                 }
 351                 ivalue =
 352                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 353                                  ii].scratch[CDP_init_seasonal].u_cnt;
 354                 fprintf(out_file, "\t\t\t<init_flag>%lu</init_flag>\n",
 355                         ivalue);
 356                 break;
 357             case CF_DEVPREDICT:
 358                 break;
 359             case CF_FAILURES:
 360             {
 361                 unsigned short vidx;
 362                 char     *violations_array = (char *) ((void *)
 363                                                        rrd.cdp_prep[i *
 364                                                                     rrd.
 365                                                                     stat_head->
 366                                                                     ds_cnt +
 367                                                                     ii].
 368                                                        scratch);
 369                 fprintf(out_file, "\t\t\t<history> ");
 370                 for (vidx = 0;
 371                      vidx < rrd.rra_def[i].par[RRA_window_len].u_cnt;
 372                      ++vidx) {
 373                     fprintf(out_file, "%d", violations_array[vidx]);
 374                 }
 375                 fprintf(out_file, " </history>\n");
 376             }
 377                 break;
 378             case CF_AVERAGE:
 379             case CF_MAXIMUM:
 380             case CF_MINIMUM:
 381             case CF_LAST:
 382             default:
 383                 value =
 384                     rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 385                                  ii].scratch[CDP_val].u_val;
 386                 if (isnan(value)) {
 387                     fprintf(out_file, "\t\t\t<value>NaN</value>\n");
 388                 } else {
 389                     fprintf(out_file, "\t\t\t<value>%0.10e</value>\n",
 390                             value);
 391                 }
 392                 fprintf(out_file,
 393                         "\t\t\t<unknown_datapoints>%lu</unknown_datapoints>\n",
 394                         rrd.cdp_prep[i * rrd.stat_head->ds_cnt +
 395                                      ii].scratch[CDP_unkn_pdp_cnt].u_cnt);
 396                 break;
 397             }
 398             fprintf(out_file, "\t\t\t</ds>\n");
 399         }
 400         fprintf(out_file, "\t\t</cdp_prep>\n");
 401
 402         fprintf(out_file, "\t\t<database>\n");
 403         rrd_seek(rrd_file, (rra_start + (rrd.rra_ptr[i].cur_row + 1)
 404                             * rrd.stat_head->ds_cnt
 405                             * sizeof(rrd_value_t)), SEEK_SET);
 406         timer = -(long)(rrd.rra_def[i].row_cnt - 1);
 407         ii = rrd.rra_ptr[i].cur_row;
 408         for (ix = 0; ix < rrd.rra_def[i].row_cnt; ix++) {
 409             ii++;
 410             if (ii >= rrd.rra_def[i].row_cnt) {
 411                 rrd_seek(rrd_file, rra_start, SEEK_SET);
 412                 ii = 0; /* wrap if max row cnt is reached */
 413             }
 414             now = (rrd.live_head->last_up
 415                    - rrd.live_head->last_up
 416                    % (rrd.rra_def[i].pdp_cnt * rrd.stat_head->pdp_step))
 417                 + (timer * rrd.rra_def[i].pdp_cnt * rrd.stat_head->pdp_step);
 418
 419             timer++;
 420 #if HAVE_STRFTIME
 421             localtime_r(&now, &tm);
 422             strftime(somestring, 200, "%Y-%m-%d %H:%M:%S %Z", &tm);
 423 #else
 424 # error "Need strftime"
 425 #endif
 426             fprintf(out_file, "\t\t\t<!-- %s / %lld --> <row>", somestring,
 427                     (long long) now);
 428             for (iii = 0; iii < rrd.stat_head->ds_cnt; iii++) {
 429                 rrd_read(rrd_file, &my_cdp, sizeof(rrd_value_t) * 1);
 430                 if (isnan(my_cdp)) {
 431                     fprintf(out_file, "<v>NaN</v>");
 432                 } else {
 433                     fprintf(out_file, "<v>%0.10e</v>", my_cdp);
 434                 };
 435             }
 436             fprintf(out_file, "</row>\n");
 437         }
 438         fprintf(out_file, "\t\t</database>\n\t</rra>\n");
 439
 440     }
 441     fprintf(out_file, "</rrd>\n");
 442     rrd_free(&rrd);
 443     if (out_file != stdout) {
 444         fclose(out_file);
 445     }
 446 #ifdef HAVE_SETLOCALE
 447     setlocale(LC_NUMERIC, old_locale);
 448 #endif
 449     return rrd_close(rrd_file);
 450 }
 451
 452 /* backward compatibility with 1.2.x */
 453 int rrd_dump_r(
 454     const char *filename,
 455     char *outname)
 456 {
 457     return rrd_dump_opt_r(filename, outname, 0);
 458 }
 459
 460 int rrd_dump(
 461     int argc,
 462     char **argv)
 463 {
 464     int       rc;
 465     /**
 466      * 0 = no header
 467      * 1 = dtd header
 468      * 2 = xsd header
 469      */
 470     int       opt_header = 1;
 471     char     *opt_daemon = NULL;
 472
 473     /* init rrd clean */
 474
 475     optind = 0;
 476     opterr = 0;         /* initialize getopt */
 477
 478     while (42) {/* ha ha */
 479         int       opt;
 480         int       option_index = 0;
 481         static struct option long_options[] = {
 482             {"daemon", required_argument, 0, 'd'},
 483             {"header", required_argument, 0, 'h'},
 484             {"no-header", no_argument, 0, 'n'},
 485             {0, 0, 0, 0}
 486         };
 487
 488         opt = getopt_long(argc, argv, "d:h:n", long_options, &option_index);
 489
 490         if (opt == EOF)
 491             break;
 492
 493         switch (opt) {
 494         case 'd':
 495             if (opt_daemon != NULL)
 496                     free (opt_daemon);
 497             opt_daemon = strdup (optarg);
 498             if (opt_daemon == NULL)
 499             {
 500                 rrd_set_error ("strdup failed.");
 501                 return (-1);
 502             }
 503             break;
 504
 505         case 'n':
 506            opt_header = 0;
 507            break;
 508
 509         case 'h':
 510            if (strcmp(optarg, "dtd") == 0) {
 511                 opt_header = 1;
 512            } else if (strcmp(optarg, "xsd") == 0) {
 513                 opt_header = 2;
 514            } else if (strcmp(optarg, "none") == 0) {
 515                 opt_header = 0;
 516            }
 517            break;
 518
 519         default:
 520             rrd_set_error("usage rrdtool %s [--header|-h {none,xsd,dtd}] [--no-header]"
 521                           "file.rrd [file.xml]", argv[0]);
 522             return (-1);
 523             break;
 524         }
 525     }                   /* while (42) */
 526
 527     if ((argc - optind) < 1 || (argc - optind) > 2) {
 528         rrd_set_error("usage rrdtool %s [--header|-h {none,xsd,dtd}] [--no-header]"
 529                       "file.rrd [file.xml]", argv[0]);
 530         return (-1);
 531     }
 532
 533     rc = rrdc_flush_if_daemon(opt_daemon, argv[optind]);
 534     if (opt_daemon) free(opt_daemon);
 535     if (rc) return (rc);
 536
 537     if ((argc - optind) == 2) {
 538         rc = rrd_dump_opt_r(argv[optind], argv[optind + 1], opt_header);
 539     } else {
 540         rc = rrd_dump_opt_r(argv[optind], NULL, opt_header);
 541     }
 542
 543     return rc;
 544 }