src/rrd_create.c

   1 /*****************************************************************************
   2  * RRDtool 1.2.23  Copyright by Tobi Oetiker, 1997-2007
   3  *****************************************************************************
   4  * rrd_create.c  creates new rrds
   5  *****************************************************************************/
   6
   7 #include <locale.h>
   8
   9 #include "rrd_tool.h"
  10 #include "rrd_rpncalc.h"
  11 #include "rrd_hw.h"
  12
  13 #include "rrd_is_thread_safe.h"
  14
  15 unsigned long FnvHash(
  16     const char *str);
  17 int       create_hw_contingent_rras(
  18     rrd_t *rrd,
  19     unsigned short period,
  20     unsigned long hashed_name);
  21 void      parseGENERIC_DS(
  22     const char *def,
  23     rrd_t *rrd,
  24     int ds_idx);
  25
  26 int rrd_create(
  27     int argc,
  28     char **argv)
  29 {
  30     struct option long_options[] = {
  31         {"start", required_argument, 0, 'b'},
  32         {"step", required_argument, 0, 's'},
  33         {0, 0, 0, 0}
  34     };
  35     int       option_index = 0;
  36     int       opt;
  37     time_t    last_up = time(NULL) - 10;
  38     unsigned long pdp_step = 300;
  39     struct rrd_time_value last_up_tv;
  40     char     *parsetime_error = NULL;
  41     long      long_tmp;
  42     int       rc;
  43
  44     optind = 0;
  45     opterr = 0;         /* initialize getopt */
  46
  47     while (1) {
  48         opt = getopt_long(argc, argv, "b:s:", long_options, &option_index);
  49
  50         if (opt == EOF)
  51             break;
  52
  53         switch (opt) {
  54         case 'b':
  55             if ((parsetime_error = parsetime(optarg, &last_up_tv))) {
  56                 rrd_set_error("start time: %s", parsetime_error);
  57                 return (-1);
  58             }
  59             if (last_up_tv.type == RELATIVE_TO_END_TIME ||
  60                 last_up_tv.type == RELATIVE_TO_START_TIME) {
  61                 rrd_set_error("specifying time relative to the 'start' "
  62                               "or 'end' makes no sense here");
  63                 return (-1);
  64             }
  65
  66             last_up = mktime(&last_up_tv.tm) +last_up_tv.offset;
  67
  68             if (last_up < 3600 * 24 * 365 * 10) {
  69                 rrd_set_error
  70                     ("the first entry to the RRD should be after 1980");
  71                 return (-1);
  72             }
  73             break;
  74
  75         case 's':
  76             long_tmp = atol(optarg);
  77             if (long_tmp < 1) {
  78                 rrd_set_error("step size should be no less than one second");
  79                 return (-1);
  80             }
  81             pdp_step = long_tmp;
  82             break;
  83
  84         case '?':
  85             if (optopt != 0)
  86                 rrd_set_error("unknown option '%c'", optopt);
  87             else
  88                 rrd_set_error("unknown option '%s'", argv[optind - 1]);
  89             return (-1);
  90         }
  91     }
  92     if (optind == argc) {
  93         rrd_set_error("need name of an rrd file to create");
  94         return -1;
  95     }
  96     rc = rrd_create_r(argv[optind],
  97                       pdp_step, last_up,
  98                       argc - optind - 1, (const char **) (argv + optind + 1));
  99
 100     return rc;
 101 }
 102
 103 /* #define DEBUG */
 104 int rrd_create_r(
 105     const char *filename,
 106     unsigned long pdp_step,
 107     time_t last_up,
 108     int argc,
 109     const char **argv)
 110 {
 111     rrd_t     rrd;
 112     long      i;
 113     int       offset;
 114     char     *token;
 115     char      dummychar1[2], dummychar2[2];
 116     unsigned short token_idx, error_flag, period = 0;
 117     unsigned long hashed_name;
 118
 119     /* init rrd clean */
 120     rrd_init(&rrd);
 121     /* static header */
 122     if ((rrd.stat_head = calloc(1, sizeof(stat_head_t))) == NULL) {
 123         rrd_set_error("allocating rrd.stat_head");
 124         rrd_free(&rrd);
 125         return (-1);
 126     }
 127
 128     /* live header */
 129     if ((rrd.live_head = calloc(1, sizeof(live_head_t))) == NULL) {
 130         rrd_set_error("allocating rrd.live_head");
 131         rrd_free(&rrd);
 132         return (-1);
 133     }
 134
 135     /* set some defaults */
 136     strcpy(rrd.stat_head->cookie, RRD_COOKIE);
 137     strcpy(rrd.stat_head->version, RRD_VERSION);
 138     rrd.stat_head->float_cookie = FLOAT_COOKIE;
 139     rrd.stat_head->ds_cnt = 0;  /* this will be adjusted later */
 140     rrd.stat_head->rra_cnt = 0; /* ditto */
 141     rrd.stat_head->pdp_step = pdp_step; /* 5 minute default */
 142
 143     /* a default value */
 144     rrd.ds_def = NULL;
 145     rrd.rra_def = NULL;
 146
 147     rrd.live_head->last_up = last_up;
 148
 149     /* optind points to the first non-option command line arg,
 150      * in this case, the file name. */
 151     /* Compute the FNV hash value (used by SEASONAL and DEVSEASONAL
 152      * arrays. */
 153     hashed_name = FnvHash(filename);
 154     for (i = 0; i < argc; i++) {
 155         unsigned int ii;
 156
 157         if (strncmp(argv[i], "DS:", 3) == 0) {
 158             size_t    old_size = sizeof(ds_def_t) * (rrd.stat_head->ds_cnt);
 159
 160             if ((rrd.ds_def = rrd_realloc(rrd.ds_def,
 161                                           old_size + sizeof(ds_def_t))) ==
 162                 NULL) {
 163                 rrd_set_error("allocating rrd.ds_def");
 164                 rrd_free(&rrd);
 165                 return (-1);
 166             }
 167             memset(&rrd.ds_def[rrd.stat_head->ds_cnt], 0, sizeof(ds_def_t));
 168             /* extract the name and type */
 169             switch (sscanf(&argv[i][3],
 170                            DS_NAM_FMT "%1[:]" DST_FMT "%1[:]%n",
 171                            rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
 172                            dummychar1,
 173                            rrd.ds_def[rrd.stat_head->ds_cnt].dst,
 174                            dummychar2, &offset)) {
 175             case 0:
 176             case 1:
 177                 rrd_set_error("Invalid DS name");
 178                 break;
 179             case 2:
 180             case 3:
 181                 rrd_set_error("Invalid DS type");
 182                 break;
 183             case 4:    /* (%n may or may not be counted) */
 184             case 5:    /* check for duplicate datasource names */
 185                 for (ii = 0; ii < rrd.stat_head->ds_cnt; ii++)
 186                     if (strcmp(rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
 187                                rrd.ds_def[ii].ds_nam) == 0)
 188                         rrd_set_error("Duplicate DS name: %s",
 189                                       rrd.ds_def[ii].ds_nam);
 190                 /* DS_type may be valid or not. Checked later */
 191                 break;
 192             default:
 193                 rrd_set_error("invalid DS format");
 194             }
 195             if (rrd_test_error()) {
 196                 rrd_free(&rrd);
 197                 return -1;
 198             }
 199
 200             /* parse the remainder of the arguments */
 201             switch (dst_conv(rrd.ds_def[rrd.stat_head->ds_cnt].dst)) {
 202             case DST_COUNTER:
 203             case DST_ABSOLUTE:
 204             case DST_GAUGE:
 205             case DST_DERIVE:
 206                 parseGENERIC_DS(&argv[i][offset + 3], &rrd,
 207                                 rrd.stat_head->ds_cnt);
 208                 break;
 209             case DST_CDEF:
 210                 parseCDEF_DS(&argv[i][offset + 3], &rrd,
 211                              rrd.stat_head->ds_cnt);
 212                 break;
 213             default:
 214                 rrd_set_error("invalid DS type specified");
 215                 break;
 216             }
 217
 218             if (rrd_test_error()) {
 219                 rrd_free(&rrd);
 220                 return -1;
 221             }
 222             rrd.stat_head->ds_cnt++;
 223         } else if (strncmp(argv[i], "RRA:", 4) == 0) {
 224             char     *argvcopy;
 225             char     *tokptr;
 226             size_t    old_size = sizeof(rra_def_t) * (rrd.stat_head->rra_cnt);
 227
 228             if ((rrd.rra_def = rrd_realloc(rrd.rra_def,
 229                                            old_size + sizeof(rra_def_t))) ==
 230                 NULL) {
 231                 rrd_set_error("allocating rrd.rra_def");
 232                 rrd_free(&rrd);
 233                 return (-1);
 234             }
 235             memset(&rrd.rra_def[rrd.stat_head->rra_cnt], 0,
 236                    sizeof(rra_def_t));
 237
 238             argvcopy = strdup(argv[i]);
 239             token = strtok_r(&argvcopy[4], ":", &tokptr);
 240             token_idx = error_flag = 0;
 241             while (token != NULL) {
 242                 switch (token_idx) {
 243                 case 0:
 244                     if (sscanf(token, CF_NAM_FMT,
 245                                rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) !=
 246                         1)
 247                         rrd_set_error("Failed to parse CF name");
 248                     switch (cf_conv
 249                             (rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam)) {
 250                     case CF_HWPREDICT:
 251                     case CF_MHWPREDICT:
 252                         /* initialize some parameters */
 253                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_alpha].
 254                             u_val = 0.1;
 255                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_beta].
 256                             u_val = 1.0 / 288;
 257                         rrd.rra_def[rrd.stat_head->rra_cnt].
 258                             par[RRA_dependent_rra_idx].u_cnt =
 259                             rrd.stat_head->rra_cnt;
 260                         break;
 261                     case CF_DEVSEASONAL:
 262                     case CF_SEASONAL:
 263                         /* initialize some parameters */
 264                         rrd.rra_def[rrd.stat_head->rra_cnt].
 265                             par[RRA_seasonal_gamma].u_val = 0.1;
 266                         /* fall through */
 267                     case CF_DEVPREDICT:
 268                         rrd.rra_def[rrd.stat_head->rra_cnt].
 269                             par[RRA_dependent_rra_idx].u_cnt = -1;
 270                         break;
 271                     case CF_FAILURES:
 272                         rrd.rra_def[rrd.stat_head->rra_cnt].
 273                             par[RRA_delta_pos].u_val = 2.0;
 274                         rrd.rra_def[rrd.stat_head->rra_cnt].
 275                             par[RRA_delta_neg].u_val = 2.0;
 276                         rrd.rra_def[rrd.stat_head->rra_cnt].
 277                             par[RRA_window_len].u_cnt = 3;
 278                         rrd.rra_def[rrd.stat_head->rra_cnt].
 279                             par[RRA_failure_threshold].u_cnt = 2;
 280                         rrd.rra_def[rrd.stat_head->rra_cnt].
 281                             par[RRA_dependent_rra_idx].u_cnt = -1;
 282                         break;
 283                         /* invalid consolidation function */
 284                     case -1:
 285                         rrd_set_error
 286                             ("Unrecognized consolidation function %s",
 287                              rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam);
 288                     default:
 289                         break;
 290                     }
 291                     /* default: 1 pdp per cdp */
 292                     rrd.rra_def[rrd.stat_head->rra_cnt].pdp_cnt = 1;
 293                     break;
 294                 case 1:
 295                     switch (cf_conv
 296                             (rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam)) {
 297                     case CF_HWPREDICT:
 298                     case CF_MHWPREDICT:
 299                     case CF_DEVSEASONAL:
 300                     case CF_SEASONAL:
 301                     case CF_DEVPREDICT:
 302                     case CF_FAILURES:
 303                         rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt =
 304                             atoi(token);
 305                         break;
 306                     default:
 307                         rrd.rra_def[rrd.stat_head->rra_cnt].
 308                             par[RRA_cdp_xff_val].u_val = atof(token);
 309                         if (rrd.rra_def[rrd.stat_head->rra_cnt].
 310                             par[RRA_cdp_xff_val].u_val < 0.0
 311                             || rrd.rra_def[rrd.stat_head->rra_cnt].
 312                             par[RRA_cdp_xff_val].u_val >= 1.0)
 313                             rrd_set_error
 314                                 ("Invalid xff: must be between 0 and 1");
 315                         break;
 316                     }
 317                     break;
 318                 case 2:
 319                     switch (cf_conv
 320                             (rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam)) {
 321                     case CF_HWPREDICT:
 322                     case CF_MHWPREDICT:
 323                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_alpha].
 324                             u_val = atof(token);
 325                         if (atof(token) <= 0.0 || atof(token) >= 1.0)
 326                             rrd_set_error
 327                                 ("Invalid alpha: must be between 0 and 1");
 328                         break;
 329                     case CF_DEVSEASONAL:
 330                     case CF_SEASONAL:
 331                         rrd.rra_def[rrd.stat_head->rra_cnt].
 332                             par[RRA_seasonal_gamma].u_val = atof(token);
 333                         if (atof(token) <= 0.0 || atof(token) >= 1.0)
 334                             rrd_set_error
 335                                 ("Invalid gamma: must be between 0 and 1");
 336                         rrd.rra_def[rrd.stat_head->rra_cnt].
 337                             par[RRA_seasonal_smooth_idx].u_cnt =
 338                             hashed_name %
 339                             rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt;
 340                         break;
 341                     case CF_FAILURES:
 342                         /* specifies the # of violations that constitutes the failure threshold */
 343                         rrd.rra_def[rrd.stat_head->rra_cnt].
 344                             par[RRA_failure_threshold].u_cnt = atoi(token);
 345                         if (atoi(token) < 1
 346                             || atoi(token) > MAX_FAILURES_WINDOW_LEN)
 347                             rrd_set_error
 348                                 ("Failure threshold is out of range %d, %d",
 349                                  1, MAX_FAILURES_WINDOW_LEN);
 350                         break;
 351                     case CF_DEVPREDICT:
 352                         /* specifies the index (1-based) of CF_DEVSEASONAL array
 353                          * associated with this CF_DEVPREDICT array. */
 354                         rrd.rra_def[rrd.stat_head->rra_cnt].
 355                             par[RRA_dependent_rra_idx].u_cnt =
 356                             atoi(token) - 1;
 357                         break;
 358                     default:
 359                         rrd.rra_def[rrd.stat_head->rra_cnt].pdp_cnt =
 360                             atoi(token);
 361                         break;
 362                     }
 363                     break;
 364                 case 3:
 365                     switch (cf_conv
 366                             (rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam)) {
 367                     case CF_HWPREDICT:
 368                     case CF_MHWPREDICT:
 369                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_beta].
 370                             u_val = atof(token);
 371                         if (atof(token) < 0.0 || atof(token) > 1.0)
 372                             rrd_set_error
 373                                 ("Invalid beta: must be between 0 and 1");
 374                         break;
 375                     case CF_DEVSEASONAL:
 376                     case CF_SEASONAL:
 377                         /* specifies the index (1-based) of CF_HWPREDICT array
 378                          * associated with this CF_DEVSEASONAL or CF_SEASONAL array.
 379                          * */
 380                         rrd.rra_def[rrd.stat_head->rra_cnt].
 381                             par[RRA_dependent_rra_idx].u_cnt =
 382                             atoi(token) - 1;
 383                         break;
 384                     case CF_FAILURES:
 385                         /* specifies the window length */
 386                         rrd.rra_def[rrd.stat_head->rra_cnt].
 387                             par[RRA_window_len].u_cnt = atoi(token);
 388                         if (atoi(token) < 1
 389                             || atoi(token) > MAX_FAILURES_WINDOW_LEN)
 390                             rrd_set_error
 391                                 ("Window length is out of range %d, %d", 1,
 392                                  MAX_FAILURES_WINDOW_LEN);
 393                         /* verify that window length exceeds the failure threshold */
 394                         if (rrd.rra_def[rrd.stat_head->rra_cnt].
 395                             par[RRA_window_len].u_cnt <
 396                             rrd.rra_def[rrd.stat_head->rra_cnt].
 397                             par[RRA_failure_threshold].u_cnt)
 398                             rrd_set_error
 399                                 ("Window length is shorter than the failure threshold");
 400                         break;
 401                     case CF_DEVPREDICT:
 402                         /* shouldn't be any more arguments */
 403                         rrd_set_error
 404                             ("Unexpected extra argument for consolidation function DEVPREDICT");
 405                         break;
 406                     default:
 407                         rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt =
 408                             atoi(token);
 409                         break;
 410                     }
 411                     break;
 412                 case 4:
 413                     switch (cf_conv
 414                             (rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam)) {
 415                     case CF_FAILURES:
 416                         /* specifies the index (1-based) of CF_DEVSEASONAL array
 417                          * associated with this CF_DEVFAILURES array. */
 418                         rrd.rra_def[rrd.stat_head->rra_cnt].
 419                             par[RRA_dependent_rra_idx].u_cnt =
 420                             atoi(token) - 1;
 421                         break;
 422                     case CF_HWPREDICT:
 423                     case CF_MHWPREDICT:
 424                         /* length of the associated CF_SEASONAL and CF_DEVSEASONAL arrays. */
 425                         period = atoi(token);
 426                         if (period >
 427                             rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt)
 428                             rrd_set_error
 429                                 ("Length of seasonal cycle exceeds length of HW prediction array");
 430                         break;
 431                     default:
 432                         /* shouldn't be any more arguments */
 433                         rrd_set_error
 434                             ("Unexpected extra argument for consolidation function %s",
 435                              rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam);
 436                         break;
 437                     }
 438                     break;
 439                 case 5:
 440                     /* If we are here, this must be a CF_HWPREDICT RRA.
 441                      * Specifies the index (1-based) of CF_SEASONAL array
 442                      * associated with this CF_HWPREDICT array. If this argument
 443                      * is missing, then the CF_SEASONAL, CF_DEVSEASONAL, CF_DEVPREDICT,
 444                      * CF_FAILURES.
 445                      * arrays are created automatically. */
 446                     rrd.rra_def[rrd.stat_head->rra_cnt].
 447                         par[RRA_dependent_rra_idx].u_cnt = atoi(token) - 1;
 448                     break;
 449                 default:
 450                     /* should never get here */
 451                     rrd_set_error("Unknown error");
 452                     break;
 453                 }       /* end switch */
 454                 if (rrd_test_error()) {
 455                     /* all errors are unrecoverable */
 456                     free(argvcopy);
 457                     rrd_free(&rrd);
 458                     return (-1);
 459                 }
 460                 token = strtok_r(NULL, ":", &tokptr);
 461                 token_idx++;
 462             }           /* end while */
 463             free(argvcopy);
 464 #ifdef DEBUG
 465             fprintf(stderr,
 466                     "Creating RRA CF: %s, dep idx %lu, current idx %lu\n",
 467                     rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam,
 468                     rrd.rra_def[rrd.stat_head->rra_cnt].
 469                     par[RRA_dependent_rra_idx].u_cnt, rrd.stat_head->rra_cnt);
 470 #endif
 471             /* should we create CF_SEASONAL, CF_DEVSEASONAL, and CF_DEVPREDICT? */
 472             if ((cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) ==
 473                  CF_HWPREDICT
 474                  || cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) ==
 475                  CF_MHWPREDICT)
 476                 && rrd.rra_def[rrd.stat_head->rra_cnt].
 477                 par[RRA_dependent_rra_idx].u_cnt == rrd.stat_head->rra_cnt) {
 478 #ifdef DEBUG
 479                 fprintf(stderr, "Creating HW contingent RRAs\n");
 480 #endif
 481                 if (create_hw_contingent_rras(&rrd, period, hashed_name) ==
 482                     -1) {
 483                     rrd_set_error("creating contingent RRA");
 484                     rrd_free(&rrd);
 485                     return -1;
 486                 }
 487             }
 488             rrd.stat_head->rra_cnt++;
 489         } else {
 490             rrd_set_error("can't parse argument '%s'", argv[i]);
 491             rrd_free(&rrd);
 492             return -1;
 493         }
 494     }
 495
 496
 497     if (rrd.stat_head->rra_cnt < 1) {
 498         rrd_set_error("you must define at least one Round Robin Archive");
 499         rrd_free(&rrd);
 500         return (-1);
 501     }
 502
 503     if (rrd.stat_head->ds_cnt < 1) {
 504         rrd_set_error("you must define at least one Data Source");
 505         rrd_free(&rrd);
 506         return (-1);
 507     }
 508     return rrd_create_fn(filename, &rrd);
 509 }
 510
 511 void parseGENERIC_DS(
 512     const char *def,
 513     rrd_t *rrd,
 514     int ds_idx)
 515 {
 516     char      minstr[DS_NAM_SIZE], maxstr[DS_NAM_SIZE];
 517     char *old_locale;
 518     /*
 519        int temp;
 520
 521        temp = sscanf(def,"%lu:%18[^:]:%18[^:]",
 522        &(rrd -> ds_def[ds_idx].par[DS_mrhb_cnt].u_cnt),
 523        minstr,maxstr);
 524      */
 525     old_locale = setlocale(LC_NUMERIC,"C");
 526     if (sscanf(def, "%lu:%18[^:]:%18[^:]",
 527                &(rrd->ds_def[ds_idx].par[DS_mrhb_cnt].u_cnt),
 528                minstr, maxstr) == 3) {
 529         if (minstr[0] == 'U' && minstr[1] == 0)
 530             rrd->ds_def[ds_idx].par[DS_min_val].u_val = DNAN;
 531         else
 532             rrd->ds_def[ds_idx].par[DS_min_val].u_val = atof(minstr);
 533
 534         if (maxstr[0] == 'U' && maxstr[1] == 0)
 535             rrd->ds_def[ds_idx].par[DS_max_val].u_val = DNAN;
 536         else
 537             rrd->ds_def[ds_idx].par[DS_max_val].u_val = atof(maxstr);
 538
 539         if (!isnan(rrd->ds_def[ds_idx].par[DS_min_val].u_val) &&
 540             !isnan(rrd->ds_def[ds_idx].par[DS_max_val].u_val) &&
 541             rrd->ds_def[ds_idx].par[DS_min_val].u_val
 542             >= rrd->ds_def[ds_idx].par[DS_max_val].u_val) {
 543             rrd_set_error("min must be less than max in DS definition");
 544             setlocale(LC_NUMERIC,old_locale);
 545             return;
 546         }
 547     } else {
 548         rrd_set_error("failed to parse data source %s", def);
 549     }
 550     setlocale(LC_NUMERIC,old_locale);
 551 }
 552
 553 /* Create the CF_DEVPREDICT, CF_DEVSEASONAL, CF_SEASONAL, and CF_FAILURES RRAs
 554  * associated with a CF_HWPREDICT RRA. */
 555 int create_hw_contingent_rras(
 556     rrd_t *rrd,
 557     unsigned short period,
 558     unsigned long hashed_name)
 559 {
 560     size_t    old_size;
 561     rra_def_t *current_rra;
 562
 563     /* save index to CF_HWPREDICT */
 564     unsigned long hw_index = rrd->stat_head->rra_cnt;
 565
 566     /* advance the pointer */
 567     (rrd->stat_head->rra_cnt)++;
 568     /* allocate the memory for the 4 contingent RRAs */
 569     old_size = sizeof(rra_def_t) * (rrd->stat_head->rra_cnt);
 570     if ((rrd->rra_def = rrd_realloc(rrd->rra_def,
 571                                     old_size + 4 * sizeof(rra_def_t))) ==
 572         NULL) {
 573         rrd_set_error("allocating rrd.rra_def");
 574         return (-1);
 575     }
 576     /* clear memory */
 577     memset(&(rrd->rra_def[rrd->stat_head->rra_cnt]), 0,
 578            4 * sizeof(rra_def_t));
 579
 580     /* create the CF_SEASONAL RRA */
 581     current_rra = &(rrd->rra_def[rrd->stat_head->rra_cnt]);
 582     strcpy(current_rra->cf_nam, "SEASONAL");
 583     current_rra->row_cnt = period;
 584     current_rra->par[RRA_seasonal_smooth_idx].u_cnt = hashed_name % period;
 585     current_rra->pdp_cnt = 1;
 586     current_rra->par[RRA_seasonal_gamma].u_val =
 587         rrd->rra_def[hw_index].par[RRA_hw_alpha].u_val;
 588     current_rra->par[RRA_dependent_rra_idx].u_cnt = hw_index;
 589     rrd->rra_def[hw_index].par[RRA_dependent_rra_idx].u_cnt =
 590         rrd->stat_head->rra_cnt;
 591
 592     /* create the CF_DEVSEASONAL RRA */
 593     (rrd->stat_head->rra_cnt)++;
 594     current_rra = &(rrd->rra_def[rrd->stat_head->rra_cnt]);
 595     strcpy(current_rra->cf_nam, "DEVSEASONAL");
 596     current_rra->row_cnt = period;
 597     current_rra->par[RRA_seasonal_smooth_idx].u_cnt = hashed_name % period;
 598     current_rra->pdp_cnt = 1;
 599     current_rra->par[RRA_seasonal_gamma].u_val =
 600         rrd->rra_def[hw_index].par[RRA_hw_alpha].u_val;
 601     current_rra->par[RRA_dependent_rra_idx].u_cnt = hw_index;
 602
 603     /* create the CF_DEVPREDICT RRA */
 604     (rrd->stat_head->rra_cnt)++;
 605     current_rra = &(rrd->rra_def[rrd->stat_head->rra_cnt]);
 606     strcpy(current_rra->cf_nam, "DEVPREDICT");
 607     current_rra->row_cnt = (rrd->rra_def[hw_index]).row_cnt;
 608     current_rra->pdp_cnt = 1;
 609     current_rra->par[RRA_dependent_rra_idx].u_cnt = hw_index + 2;   /* DEVSEASONAL */
 610
 611     /* create the CF_FAILURES RRA */
 612     (rrd->stat_head->rra_cnt)++;
 613     current_rra = &(rrd->rra_def[rrd->stat_head->rra_cnt]);
 614     strcpy(current_rra->cf_nam, "FAILURES");
 615     current_rra->row_cnt = period;
 616     current_rra->pdp_cnt = 1;
 617     current_rra->par[RRA_delta_pos].u_val = 2.0;
 618     current_rra->par[RRA_delta_neg].u_val = 2.0;
 619     current_rra->par[RRA_failure_threshold].u_cnt = 7;
 620     current_rra->par[RRA_window_len].u_cnt = 9;
 621     current_rra->par[RRA_dependent_rra_idx].u_cnt = hw_index + 2;   /* DEVSEASONAL */
 622     return 0;
 623 }
 624
 625 /* create and empty rrd file according to the specs given */
 626
 627 int rrd_create_fn(
 628     const char *file_name,
 629     rrd_t *rrd)
 630 {
 631     unsigned long i, ii;
 632     int    rrd_file;
 633     rrd_value_t *unknown;
 634     int       unkn_cnt;
 635     rrd_file_t *rrd_file_dn;
 636     rrd_t      rrd_dn;
 637
 638     if ((rrd_file = open(file_name, O_WRONLY|O_CREAT|O_TRUNC,0666)) == NULL) {
 639         rrd_set_error("creating '%s': %s", file_name, rrd_strerror(errno));
 640         rrd_free(rrd);
 641         return (-1);
 642     }
 643
 644     write(rrd_file,rrd->stat_head, sizeof(stat_head_t));
 645
 646     write(rrd_file,rrd->ds_def, sizeof(ds_def_t)*rrd->stat_head->ds_cnt);
 647
 648     write(rrd_file,rrd->rra_def,
 649            sizeof(rra_def_t)* rrd->stat_head->rra_cnt);
 650
 651     write(rrd_file,rrd->live_head, sizeof(live_head_t));
 652
 653     if ((rrd->pdp_prep = calloc(1, sizeof(pdp_prep_t))) == NULL) {
 654         rrd_set_error("allocating pdp_prep");
 655         rrd_free(rrd);
 656         close(rrd_file);
 657         return (-1);
 658     }
 659
 660     strcpy(rrd->pdp_prep->last_ds, "UNKN");
 661
 662     rrd->pdp_prep->scratch[PDP_val].u_val = 0.0;
 663     rrd->pdp_prep->scratch[PDP_unkn_sec_cnt].u_cnt =
 664         rrd->live_head->last_up % rrd->stat_head->pdp_step;
 665
 666     for (i = 0; i < rrd->stat_head->ds_cnt; i++)
 667         write(rrd_file,rrd->pdp_prep, sizeof(pdp_prep_t));
 668
 669     if ((rrd->cdp_prep = calloc(1, sizeof(cdp_prep_t))) == NULL) {
 670         rrd_set_error("allocating cdp_prep");
 671         rrd_free(rrd);
 672         close(rrd_file);
 673         return (-1);
 674     }
 675
 676
 677     for (i = 0; i < rrd->stat_head->rra_cnt; i++) {
 678         switch (cf_conv(rrd->rra_def[i].cf_nam)) {
 679         case CF_HWPREDICT:
 680         case CF_MHWPREDICT:
 681             init_hwpredict_cdp(rrd->cdp_prep);
 682             break;
 683         case CF_SEASONAL:
 684         case CF_DEVSEASONAL:
 685             init_seasonal_cdp(rrd->cdp_prep);
 686             break;
 687         case CF_FAILURES:
 688             /* initialize violation history to 0 */
 689             for (ii = 0; ii < MAX_CDP_PAR_EN; ii++) {
 690                 /* We can zero everything out, by setting u_val to the
 691                  * NULL address. Each array entry in scratch is 8 bytes
 692                  * (a double), but u_cnt only accessed 4 bytes (long) */
 693                 rrd->cdp_prep->scratch[ii].u_val = 0.0;
 694             }
 695             break;
 696         default:
 697             /* can not be zero because we don't know anything ... */
 698             rrd->cdp_prep->scratch[CDP_val].u_val = DNAN;
 699             /* startup missing pdp count */
 700             rrd->cdp_prep->scratch[CDP_unkn_pdp_cnt].u_cnt =
 701                 ((rrd->live_head->last_up -
 702                   rrd->pdp_prep->scratch[PDP_unkn_sec_cnt].u_cnt)
 703                  % (rrd->stat_head->pdp_step
 704                     * rrd->rra_def[i].pdp_cnt)) / rrd->stat_head->pdp_step;
 705             break;
 706         }
 707
 708         for (ii = 0; ii < rrd->stat_head->ds_cnt; ii++) {
 709             write(rrd_file,rrd->cdp_prep, sizeof(cdp_prep_t));
 710         }
 711     }
 712
 713     /* now, we must make sure that the rest of the rrd
 714        struct is properly initialized */
 715
 716     if ((rrd->rra_ptr = calloc(1, sizeof(rra_ptr_t))) == NULL) {
 717         rrd_set_error("allocating rra_ptr");
 718         rrd_free(rrd);
 719         close(rrd_file);
 720         return (-1);
 721     }
 722
 723     /* changed this initialization to be consistent with
 724      * rrd_restore. With the old value (0), the first update
 725      * would occur for cur_row = 1 because rrd_update increments
 726      * the pointer a priori. */
 727     for (i = 0; i < rrd->stat_head->rra_cnt; i++) {
 728         rrd->rra_ptr->cur_row = rrd->rra_def[i].row_cnt - 1;
 729         write(rrd_file,rrd->rra_ptr, sizeof(rra_ptr_t));
 730     }
 731
 732     /* write the empty data area */
 733     if ((unknown = (rrd_value_t *) malloc(512 * sizeof(rrd_value_t))) == NULL) {
 734         rrd_set_error("allocating unknown");
 735         rrd_free(rrd);
 736         close(rrd_file);
 737         return (-1);
 738     }
 739     for (i = 0; i < 512; ++i)
 740         unknown[i] = DNAN;
 741
 742     unkn_cnt = 0;
 743     for (i = 0; i < rrd->stat_head->rra_cnt; i++)
 744         unkn_cnt += rrd->stat_head->ds_cnt * rrd->rra_def[i].row_cnt;
 745
 746     while (unkn_cnt > 0) {
 747         write(rrd_file,unknown, sizeof(rrd_value_t) * min(unkn_cnt, 512));
 748
 749         unkn_cnt -= 512;
 750     }
 751     free(unknown);
 752     fdatasync(rrd_file);
 753     rrd_free(rrd);
 754     if ( close(rrd_file) == -1 ) {
 755         rrd_set_error("creating rrd: %s", rrd_strerror(errno));
 756         return -1;
 757     }
 758     /* flush all we don't need out of the cache */
 759     rrd_file_dn = rrd_open(file_name, &rrd_dn, RRD_READONLY);
 760     rrd_dontneed(rrd_file_dn,&rrd_dn);
 761     rrd_close(rrd_file_dn);
 762     return (0);
 763 }