src/rrd_create.c

   1 /*****************************************************************************
   2  * RRDtool 1.0.33  Copyright Tobias Oetiker, 1997 - 2000
   3  *****************************************************************************
   4  * rrd_create.c  creates new rrds
   5  *****************************************************************************/
   6
   7 #include "rrd_tool.h"
   8 #include "rrd_rpncalc.h"
   9
  10 unsigned long FnvHash(char *str);
  11 int create_hw_contingent_rras(rrd_t *rrd, unsigned short period, unsigned long hashed_name);
  12 void parseGENERIC_DS(char *def,rrd_t *rrd, int ds_idx);
  13
  14 /* #define DEBUG */
  15 int
  16 rrd_create(int argc, char **argv)
  17 {
  18     rrd_t             rrd;
  19     long              i,long_tmp;
  20         int               offset;
  21     time_t            last_up;
  22     struct time_value last_up_tv;
  23     char *parsetime_error = NULL;
  24     char *token;
  25     unsigned short token_idx, error_flag, period=0;
  26         unsigned long hashed_name;
  27     /* init last_up */
  28     last_up = time(NULL)-10;
  29     /* init rrd clean */
  30     rrd_init(&rrd);
  31     /* static header */
  32     if((rrd.stat_head = calloc(1,sizeof(stat_head_t)))==NULL){
  33         rrd_set_error("allocating rrd.stat_head");
  34         return(-1);
  35     }
  36
  37     /* live header */
  38     if((rrd.live_head = calloc(1,sizeof(live_head_t)))==NULL){
  39         rrd_set_error("allocating rrd.live_head");
  40         return(-1);
  41     }
  42
  43     /* set some defaults */
  44     strcpy(rrd.stat_head->cookie,RRD_COOKIE);
  45         /* assume the will be version 1 compatible */
  46     strcpy(rrd.stat_head->version,"0001");
  47     rrd.stat_head->float_cookie = FLOAT_COOKIE;
  48     rrd.stat_head->ds_cnt = 0; /* this will be adjusted later */
  49     rrd.stat_head->rra_cnt = 0; /* ditto */
  50     rrd.stat_head->pdp_step = 300; /* 5 minute default */
  51
  52     /* a default value */
  53     rrd.ds_def = NULL;
  54     rrd.rra_def = NULL;
  55
  56     while (1){
  57         static struct option long_options[] =
  58         {
  59             {"start",      required_argument, 0, 'b'},
  60             {"step",        required_argument,0,'s'},
  61             {0,0,0,0}
  62         };
  63         int option_index = 0;
  64         int opt;
  65         opt = getopt_long(argc, argv, "b:s:",
  66                           long_options, &option_index);
  67
  68         if (opt == EOF)
  69           break;
  70
  71         switch(opt) {
  72         case 'b':
  73             if ((parsetime_error = parsetime(optarg, &last_up_tv))) {
  74                 rrd_set_error("start time: %s", parsetime_error );
  75                 rrd_free(&rrd);
  76                 return(-1);
  77             }
  78             if (last_up_tv.type == RELATIVE_TO_END_TIME ||
  79                 last_up_tv.type == RELATIVE_TO_START_TIME) {
  80                 rrd_set_error("specifying time relative to the 'start' "
  81                               "or 'end' makes no sense here");
  82                 rrd_free(&rrd);
  83                 return(-1);
  84             }
  85
  86             last_up = mktime(&last_up_tv.tm) + last_up_tv.offset;
  87
  88             if (last_up < 3600*24*365*10){
  89                 rrd_set_error("the first entry to the RRD should be after 1980");
  90                 rrd_free(&rrd);
  91                 return(-1);
  92             }
  93             break;
  94
  95         case 's':
  96             long_tmp = atol(optarg);
  97             if (long_tmp < 1){
  98                 rrd_set_error("step size should be no less than one second");
  99                 rrd_free(&rrd);
 100                 return(-1);
 101             }
 102             rrd.stat_head->pdp_step = long_tmp;
 103             break;
 104
 105         case '?':
 106             if (optopt != 0)
 107                 rrd_set_error("unknown option '%c'", optopt);
 108             else
 109                 rrd_set_error("unknown option '%s'",argv[optind-1]);
 110             rrd_free(&rrd);
 111             return(-1);
 112         }
 113     }
 114     rrd.live_head->last_up = last_up;
 115
 116         /* optind points to the first non-option command line arg,
 117          * in this case, the file name. */
 118         /* Compute the FNV hash value (used by SEASONAL and DEVSEASONAL
 119          * arrays. */
 120     hashed_name = FnvHash(argv[optind]);
 121     for(i=optind+1;i<argc;i++){
 122         int ii;
 123         if (strncmp(argv[i],"DS:",3)==0){
 124             size_t old_size = sizeof(ds_def_t)*(rrd.stat_head->ds_cnt);
 125             if((rrd.ds_def = rrd_realloc(rrd.ds_def,
 126                                          old_size+sizeof(ds_def_t)))==NULL){
 127                 rrd_set_error("allocating rrd.ds_def");
 128                 rrd_free(&rrd);
 129                 return(-1);
 130             }
 131             memset(&rrd.ds_def[rrd.stat_head->ds_cnt], 0, sizeof(ds_def_t));
 132             /* extract the name and type */
 133             if (sscanf(&argv[i][3],
 134                        DS_NAM_FMT ":" DST_FMT ":%n",
 135                        rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
 136                        rrd.ds_def[rrd.stat_head->ds_cnt].dst,&offset) == 2)
 137             {
 138                 /* check for duplicate datasource names */
 139                 for(ii=0;ii<rrd.stat_head->ds_cnt;ii++)
 140                     if(strcmp(rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
 141                               rrd.ds_def[ii].ds_nam) == 0){
 142                         rrd_set_error("Duplicate DS name: %s",rrd.ds_def[ii].ds_nam);
 143                     }
 144             } else {
 145                 rrd_set_error("invalid DS format");
 146             }
 147
 148             /* parse the remainder of the arguments */
 149             switch(dst_conv(rrd.ds_def[rrd.stat_head->ds_cnt].dst))
 150             {
 151             case DST_COUNTER:
 152             case DST_ABSOLUTE:
 153             case DST_GAUGE:
 154             case DST_DERIVE:
 155                 parseGENERIC_DS(&argv[i][offset+3],&rrd, rrd.stat_head->ds_cnt);
 156                 break;
 157             case DST_CDEF:
 158                 parseCDEF_DS(&argv[i][offset+3],&rrd, rrd.stat_head->ds_cnt);
 159                 break;
 160             default:
 161                 rrd_set_error("invalid DS type specified");
 162                 break;
 163             }
 164
 165             if (rrd_test_error()) {
 166                 rrd_free(&rrd);
 167                 return -1;
 168             }
 169             rrd.stat_head -> ds_cnt++;
 170         } else if (strncmp(argv[i],"RRA:",3)==0){
 171             size_t old_size = sizeof(rra_def_t)*(rrd.stat_head->rra_cnt);
 172             if((rrd.rra_def = rrd_realloc(rrd.rra_def,
 173                                           old_size+sizeof(rra_def_t)))==NULL)
 174             {
 175                 rrd_set_error("allocating rrd.rra_def");
 176                 rrd_free(&rrd);
 177                 return(-1);
 178             }
 179             memset(&rrd.rra_def[rrd.stat_head->rra_cnt], 0, sizeof(rra_def_t));
 180
 181             token = strtok(&argv[i][4],":");
 182             token_idx = error_flag = 0;
 183             while (token != NULL)
 184             {
 185                 switch(token_idx)
 186                 {
 187                 case 0:
 188                     if (sscanf(token,CF_NAM_FMT,
 189                                rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) != 1)
 190                         rrd_set_error("Failed to parse CF name");
 191                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 192                     {
 193                     case CF_HWPREDICT:
 194                         /* initialize some parameters */
 195                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_alpha].u_val = 0.1;
 196                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_beta].u_val = 1.0/288;
 197                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 198                             rrd.stat_head -> rra_cnt;
 199                         /* need to mark the file version */
 200                         strcpy(rrd.stat_head->version,RRD_VERSION);
 201                         break;
 202                     case CF_DEVSEASONAL:
 203                     case CF_SEASONAL:
 204                         /* initialize some parameters */
 205                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_seasonal_gamma].u_val = 0.1;
 206                         /* fall through */
 207                     case CF_DEVPREDICT:
 208                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt = -1;
 209                         break;
 210                     case CF_FAILURES:
 211                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_delta_pos].u_val = 2.0;
 212                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_delta_neg].u_val = 2.0;
 213                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_window_len].u_cnt = 3;
 214                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_failure_threshold].u_cnt = 2;
 215                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt = -1;
 216                         break;
 217                         /* invalid consolidation function */
 218                     case -1:
 219                         rrd_set_error("Unrecognized consolidation function %s",
 220                                       rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam);
 221                     default:
 222                         break;
 223                     }
 224                     /* default: 1 pdp per cdp */
 225                     rrd.rra_def[rrd.stat_head->rra_cnt].pdp_cnt = 1;
 226                     break;
 227                 case 1:
 228                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 229                     {
 230                     case CF_HWPREDICT:
 231                     case CF_DEVSEASONAL:
 232                     case CF_SEASONAL:
 233                     case CF_DEVPREDICT:
 234                     case CF_FAILURES:
 235                         rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt = atoi(token);
 236                         break;
 237                     default:
 238                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_cdp_xff_val].u_val = atof(token);
 239                         if (rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_cdp_xff_val].u_val<0.0 ||
 240                             rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_cdp_xff_val].u_val>=1.0)
 241                             rrd_set_error("Invalid xff: must be between 0 and 1");
 242                         break;
 243                     }
 244                     break;
 245                 case 2:
 246                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 247                     {
 248                     case CF_HWPREDICT:
 249                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_alpha].u_val = atof(token);
 250                         if (atof(token) <= 0.0 || atof(token) >= 1.0)
 251                             rrd_set_error("Invalid alpha: must be between 0 and 1");
 252                         break;
 253                     case CF_DEVSEASONAL:
 254                     case CF_SEASONAL:
 255                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_seasonal_gamma].u_val =
 256                             atof(token);
 257                         if (atof(token) <= 0.0 || atof(token) >= 1.0)
 258                             rrd_set_error("Invalid gamma: must be between 0 and 1");
 259                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_seasonal_smooth_idx].u_cnt
 260                             = hashed_name % rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt;
 261                         break;
 262                     case CF_FAILURES:
 263                         /* specifies the # of violations that constitutes the failure threshold */
 264                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_failure_threshold].u_cnt =
 265                             atoi(token);
 266                         if (atoi(token) < 1 || atoi(token) > MAX_FAILURES_WINDOW_LEN)
 267                             rrd_set_error("Failure threshold is out of range %d, %d",1,
 268                                           MAX_FAILURES_WINDOW_LEN);
 269                         break;
 270                     case CF_DEVPREDICT:
 271                         /* specifies the index (1-based) of CF_DEVSEASONAL array
 272                          * associated with this CF_DEVPREDICT array. */
 273                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 274                             atoi(token) - 1;
 275                         break;
 276                     default:
 277                         rrd.rra_def[rrd.stat_head->rra_cnt].pdp_cnt = atoi(token);
 278                         break;
 279                     }
 280                     break;
 281                 case 3:
 282                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 283                     {
 284                     case CF_HWPREDICT:
 285                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_beta].u_val = atof(token);
 286                         if (atof(token) < 0.0 || atof(token) > 1.0)
 287                             rrd_set_error("Invalid beta: must be between 0 and 1");
 288                         break;
 289                     case CF_DEVSEASONAL:
 290                     case CF_SEASONAL:
 291                         /* specifies the index (1-based) of CF_HWPREDICT array
 292                          * associated with this CF_DEVSEASONAL or CF_SEASONAL array.
 293                          * */
 294                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 295                             atoi(token) - 1;
 296                         break;
 297                     case CF_FAILURES:
 298                         /* specifies the window length */
 299                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_window_len].u_cnt =
 300                             atoi(token);
 301                         if (atoi(token) < 1 || atoi(token) > MAX_FAILURES_WINDOW_LEN)
 302                             rrd_set_error("Window length is out of range %d, %d",1,
 303                                           MAX_FAILURES_WINDOW_LEN);
 304                         /* verify that window length exceeds the failure threshold */
 305                         if (rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_window_len].u_cnt <
 306                             rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_failure_threshold].u_cnt)
 307                             rrd_set_error("Window length is shorter than the failure threshold");
 308                         break;
 309                     case CF_DEVPREDICT:
 310                         /* shouldn't be any more arguments */
 311                         rrd_set_error("Unexpected extra argument for consolidation function DEVPREDICT");
 312                         break;
 313                     default:
 314                         rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt = atoi(token);
 315                         break;
 316                     }
 317                     break;
 318                 case 4:
 319                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 320                     {
 321                     case CF_FAILURES:
 322                         /* specifies the index (1-based) of CF_DEVSEASONAL array
 323                          * associated with this CF_DEVFAILURES array. */
 324                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 325                             atoi(token) - 1;
 326                         break;
 327                     case CF_HWPREDICT:
 328                         /* length of the associated CF_SEASONAL and CF_DEVSEASONAL arrays. */
 329                         period = atoi(token);
 330                         if (period > rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt)
 331                             rrd_set_error("Length of seasonal cycle exceeds length of HW prediction array");
 332                         break;
 333                     default:
 334                         /* shouldn't be any more arguments */
 335                         rrd_set_error("Unexpected extra argument for consolidation function %s",
 336                                       rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam);
 337                         break;
 338                     }
 339                     break;
 340                 case 5:
 341                     /* If we are here, this must be a CF_HWPREDICT RRA.
 342                      * Specifies the index (1-based) of CF_SEASONAL array
 343                      * associated with this CF_HWPREDICT array. If this argument
 344                      * is missing, then the CF_SEASONAL, CF_DEVSEASONAL, CF_DEVPREDICT,
 345                      * CF_FAILURES.
 346                      * arrays are created automatically. */
 347                     rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 348                         atoi(token) - 1;
 349                     break;
 350                 default:
 351                     /* should never get here */
 352                     rrd_set_error("Unknown error");
 353                     break;
 354                 } /* end switch */
 355                 if (rrd_test_error())
 356                 {
 357                     /* all errors are unrecoverable */
 358                     rrd_free(&rrd);
 359                     return (-1);
 360                 }
 361                 token = strtok(NULL,":");
 362                 token_idx++;
 363             } /* end while */
 364 #ifdef DEBUG
 365             fprintf(stderr,"Creating RRA CF: %s, dep idx %lu, current idx %lu\n",
 366                     rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam,
 367                     rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt,
 368                     rrd.stat_head -> rra_cnt);
 369 #endif
 370             /* should we create CF_SEASONAL, CF_DEVSEASONAL, and CF_DEVPREDICT? */
 371             if (cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) == CF_HWPREDICT
 372                 && rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt
 373                 == rrd.stat_head -> rra_cnt)
 374             {
 375 #ifdef DEBUG
 376                 fprintf(stderr,"Creating HW contingent RRAs\n");
 377 #endif
 378                 if (create_hw_contingent_rras(&rrd,period,hashed_name) == -1) {
 379                     rrd_free(&rrd);
 380                     return -1;
 381                 }
 382             }
 383             rrd.stat_head->rra_cnt++;
 384         } else {
 385             rrd_set_error("can't parse argument '%s'",argv[i]);
 386             rrd_free(&rrd);
 387             return -1;
 388         }
 389     }
 390
 391
 392     if (rrd.stat_head->rra_cnt < 1){
 393         rrd_set_error("you must define at least one Round Robin Archive");
 394         rrd_free(&rrd);
 395         return(-1);
 396     }
 397
 398     if (rrd.stat_head->ds_cnt < 1){
 399         rrd_set_error("you must define at least one Data Source");
 400         rrd_free(&rrd);
 401         return(-1);
 402     }
 403     return rrd_create_fn(argv[optind],&rrd);
 404 }
 405
 406 void parseGENERIC_DS(char *def,rrd_t *rrd, int ds_idx)
 407 {
 408     char minstr[DS_NAM_SIZE], maxstr[DS_NAM_SIZE];
 409     /*
 410       int temp;
 411
 412       temp = sscanf(def,"%lu:%18[^:]:%18[^:]",
 413       &(rrd -> ds_def[ds_idx].par[DS_mrhb_cnt].u_cnt),
 414       minstr,maxstr);
 415     */
 416     if (sscanf(def,"%lu:%18[^:]:%18[^:]",
 417                &(rrd -> ds_def[ds_idx].par[DS_mrhb_cnt].u_cnt),
 418                minstr,maxstr) == 3)
 419     {
 420         if (minstr[0] == 'U' && minstr[1] == 0)
 421             rrd -> ds_def[ds_idx].par[DS_min_val].u_val = DNAN;
 422         else
 423             rrd -> ds_def[ds_idx].par[DS_min_val].u_val = atof(minstr);
 424
 425         if (maxstr[0] == 'U' && maxstr[1] == 0)
 426             rrd -> ds_def[ds_idx].par[DS_max_val].u_val = DNAN;
 427         else
 428             rrd -> ds_def[ds_idx].par[DS_max_val].u_val  = atof(maxstr);
 429
 430         if (! isnan(rrd -> ds_def[ds_idx].par[DS_min_val].u_val) &&
 431             ! isnan(rrd -> ds_def[ds_idx].par[DS_max_val].u_val) &&
 432             rrd -> ds_def[ds_idx].par[DS_min_val].u_val
 433             >= rrd -> ds_def[ds_idx].par[DS_max_val].u_val ) {
 434             rrd_set_error("min must be less than max in DS definition");
 435             return;
 436         }
 437     } else {
 438         rrd_set_error("failed to parse data source %s", def);
 439     }
 440 }
 441
 442 /* Create the CF_DEVPREDICT, CF_DEVSEASONAL, CF_SEASONAL, and CF_FAILURES RRAs
 443  * associated with a CF_HWPREDICT RRA. */
 444 int
 445 create_hw_contingent_rras(rrd_t *rrd, unsigned short period, unsigned long hashed_name)
 446 {
 447     size_t old_size;
 448     rra_def_t* current_rra;
 449
 450     /* save index to CF_HWPREDICT */
 451     unsigned long hw_index = rrd -> stat_head -> rra_cnt;
 452     /* advance the pointer */
 453     (rrd -> stat_head -> rra_cnt)++;
 454     /* allocate the memory for the 4 contingent RRAs */
 455     old_size = sizeof(rra_def_t)*(rrd -> stat_head->rra_cnt);
 456     if ((rrd -> rra_def = rrd_realloc(rrd -> rra_def,
 457                                       old_size+4*sizeof(rra_def_t)))==NULL)
 458     {
 459         rrd_set_error("allocating rrd.rra_def");
 460         return(-1);
 461     }
 462     /* clear memory */
 463     memset(&(rrd -> rra_def[rrd -> stat_head->rra_cnt]), 0, 4*sizeof(rra_def_t));
 464
 465     /* create the CF_SEASONAL RRA */
 466     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 467     strcpy(current_rra -> cf_nam,"SEASONAL");
 468     current_rra -> row_cnt = period;
 469     current_rra -> par[RRA_seasonal_smooth_idx].u_cnt = hashed_name % period;
 470     current_rra -> pdp_cnt = 1;
 471     current_rra -> par[RRA_seasonal_gamma].u_val =
 472         rrd -> rra_def[hw_index].par[RRA_hw_alpha].u_val;
 473     current_rra -> par[RRA_dependent_rra_idx].u_cnt = hw_index;
 474     rrd -> rra_def[hw_index].par[RRA_dependent_rra_idx].u_cnt = rrd -> stat_head -> rra_cnt;
 475
 476     /* create the CF_DEVSEASONAL RRA */
 477     (rrd -> stat_head -> rra_cnt)++;
 478     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 479     strcpy(current_rra -> cf_nam,"DEVSEASONAL");
 480     current_rra -> row_cnt = period;
 481     current_rra -> par[RRA_seasonal_smooth_idx].u_cnt = hashed_name % period;
 482     current_rra -> pdp_cnt = 1;
 483     current_rra -> par[RRA_seasonal_gamma].u_val =
 484         rrd -> rra_def[hw_index].par[RRA_hw_alpha].u_val;
 485     current_rra -> par[RRA_dependent_rra_idx].u_cnt = hw_index;
 486
 487     /* create the CF_DEVPREDICT RRA */
 488     (rrd -> stat_head -> rra_cnt)++;
 489     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 490     strcpy(current_rra -> cf_nam,"DEVPREDICT");
 491     current_rra -> row_cnt = (rrd -> rra_def[hw_index]).row_cnt;
 492     current_rra -> pdp_cnt = 1;
 493     current_rra -> par[RRA_dependent_rra_idx].u_cnt
 494         = hw_index + 2; /* DEVSEASONAL */
 495
 496     /* create the CF_FAILURES RRA */
 497     (rrd -> stat_head -> rra_cnt)++;
 498     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 499     strcpy(current_rra -> cf_nam,"FAILURES");
 500     current_rra -> row_cnt = period;
 501     current_rra -> pdp_cnt = 1;
 502     current_rra -> par[RRA_delta_pos].u_val = 2.0;
 503     current_rra -> par[RRA_delta_neg].u_val = 2.0;
 504     current_rra -> par[RRA_failure_threshold].u_cnt = 7;
 505     current_rra -> par[RRA_window_len].u_cnt = 9;
 506     current_rra -> par[RRA_dependent_rra_idx].u_cnt =
 507         hw_index + 2; /* DEVSEASONAL */
 508     return 0;
 509 }
 510
 511 /* create and empty rrd file according to the specs given */
 512
 513 int
 514 rrd_create_fn(char *file_name, rrd_t *rrd)
 515 {
 516     unsigned long    i,ii;
 517     FILE             *rrd_file;
 518     rrd_value_t       unknown = DNAN ;
 519
 520     if ((rrd_file = fopen(file_name,"wb")) == NULL ) {
 521         rrd_set_error("creating '%s': %s",file_name,strerror(errno));
 522         free(rrd->stat_head);
 523         free(rrd->ds_def);
 524         free(rrd->rra_def);
 525         return(-1);
 526     }
 527
 528     fwrite(rrd->stat_head,
 529            sizeof(stat_head_t), 1, rrd_file);
 530
 531     fwrite(rrd->ds_def,
 532            sizeof(ds_def_t), rrd->stat_head->ds_cnt, rrd_file);
 533
 534     fwrite(rrd->rra_def,
 535            sizeof(rra_def_t), rrd->stat_head->rra_cnt, rrd_file);
 536
 537     fwrite(rrd->live_head,
 538            sizeof(live_head_t),1, rrd_file);
 539
 540     if((rrd->pdp_prep = calloc(1,sizeof(pdp_prep_t))) == NULL){
 541         rrd_set_error("allocating pdp_prep");
 542         rrd_free(rrd);
 543         fclose(rrd_file);
 544         return(-1);
 545     }
 546
 547     strcpy(rrd->pdp_prep->last_ds,"UNKN");
 548
 549     rrd->pdp_prep->scratch[PDP_val].u_val = 0.0;
 550     rrd->pdp_prep->scratch[PDP_unkn_sec_cnt].u_cnt =
 551         rrd->live_head->last_up % rrd->stat_head->pdp_step;
 552
 553     for(i=0; i < rrd->stat_head->ds_cnt; i++)
 554         fwrite( rrd->pdp_prep,sizeof(pdp_prep_t),1,rrd_file);
 555
 556     if((rrd->cdp_prep = calloc(1,sizeof(cdp_prep_t))) == NULL){
 557         rrd_set_error("allocating cdp_prep");
 558         rrd_free(rrd);
 559         fclose(rrd_file);
 560         return(-1);
 561     }
 562
 563
 564     for(i=0; i < rrd->stat_head->rra_cnt; i++) {
 565        switch (cf_conv(rrd->rra_def[i].cf_nam))
 566            {
 567            case CF_HWPREDICT:
 568                rrd->cdp_prep->scratch[CDP_hw_intercept].u_val = DNAN;
 569                rrd->cdp_prep->scratch[CDP_hw_last_intercept].u_val = DNAN;
 570                rrd->cdp_prep->scratch[CDP_hw_slope].u_val = DNAN;
 571                rrd->cdp_prep->scratch[CDP_hw_last_slope].u_val = DNAN;
 572                rrd->cdp_prep->scratch[CDP_null_count].u_cnt = 1;
 573                rrd->cdp_prep->scratch[CDP_last_null_count].u_cnt = 1;
 574                break;
 575            case CF_SEASONAL:
 576            case CF_DEVSEASONAL:
 577                rrd->cdp_prep->scratch[CDP_hw_seasonal].u_val = DNAN;
 578                rrd->cdp_prep->scratch[CDP_hw_last_seasonal].u_val = DNAN;
 579                rrd->cdp_prep->scratch[CDP_init_seasonal].u_cnt = 1;
 580                break;
 581            case CF_FAILURES:
 582                /* initialize violation history to 0 */
 583                for (ii = 0; ii < MAX_CDP_PAR_EN; ii++)
 584                {
 585                                 /* We can zero everything out, by setting u_val to the
 586                                  * NULL address. Each array entry in scratch is 8 bytes
 587                                  * (a double), but u_cnt only accessed 4 bytes (long) */
 588                    rrd->cdp_prep->scratch[ii].u_val = 0.0;
 589                }
 590                break;
 591            default:
 592                /* can not be zero because we don't know anything ... */
 593                rrd->cdp_prep->scratch[CDP_val].u_val = DNAN;
 594                /* startup missing pdp count */
 595                rrd->cdp_prep->scratch[CDP_unkn_pdp_cnt].u_cnt =
 596                    ((rrd->live_head->last_up -
 597                  rrd->pdp_prep->scratch[PDP_unkn_sec_cnt].u_cnt)
 598                     % (rrd->stat_head->pdp_step
 599                        * rrd->rra_def[i].pdp_cnt)) / rrd->stat_head->pdp_step;
 600                break;
 601            }
 602
 603        for(ii=0; ii < rrd->stat_head->ds_cnt; ii++)
 604        {
 605            fwrite( rrd->cdp_prep,sizeof(cdp_prep_t),1,rrd_file);
 606        }
 607     }
 608
 609     /* now, we must make sure that the rest of the rrd
 610        struct is properly initialized */
 611
 612     if((rrd->rra_ptr = calloc(1,sizeof(rra_ptr_t))) == NULL) {
 613         rrd_set_error("allocating rra_ptr");
 614         rrd_free(rrd);
 615         fclose(rrd_file);
 616         return(-1);
 617     }
 618
 619     /* changed this initialization to be consistent with
 620      * rrd_restore. With the old value (0), the first update
 621      * would occur for cur_row = 1 because rrd_update increments
 622      * the pointer a priori. */
 623     for (i=0; i < rrd->stat_head->rra_cnt; i++)
 624     {
 625         rrd->rra_ptr->cur_row = rrd->rra_def[i].row_cnt - 1;
 626         fwrite( rrd->rra_ptr, sizeof(rra_ptr_t),1,rrd_file);
 627     }
 628
 629     /* write the empty data area */
 630     for(i=0;
 631         i <  rrd->stat_head->rra_cnt;
 632         i++)
 633     {
 634         for(ii=0;
 635             ii <  rrd->rra_def[i].row_cnt
 636                 * rrd->stat_head->ds_cnt;
 637             ii++){
 638             fwrite(&unknown,sizeof(rrd_value_t),1,rrd_file);
 639         }
 640     }
 641
 642     /* lets see if we had an error */
 643     if(ferror(rrd_file)){
 644         rrd_set_error("a file error occurred while creating '%s'",file_name);
 645         fclose(rrd_file);
 646         rrd_free(rrd);
 647         return(-1);
 648     }
 649
 650     fclose(rrd_file);
 651     rrd_free(rrd);
 652     return (0);
 653 }