src/rrd_create.c

   1 /*****************************************************************************
   2  * RRDtool 1.1.x  Copyright Tobias Oetiker, 1997 - 2002
   3  *****************************************************************************
   4  * rrd_create.c  creates new rrds
   5  *****************************************************************************/
   6
   7 #include "rrd_tool.h"
   8 #include "rrd_rpncalc.h"
   9 #include "rrd_hw.h"
  10
  11 #include "rrd_is_thread_safe.h"
  12
  13 unsigned long FnvHash(char *str);
  14 int create_hw_contingent_rras(rrd_t *rrd, unsigned short period, unsigned long hashed_name);
  15 void parseGENERIC_DS(char *def,rrd_t *rrd, int ds_idx);
  16
  17 int
  18 rrd_create(int argc, char **argv)
  19 {
  20     time_t            last_up = time(NULL)-10;
  21     unsigned long     pdp_step = 300;
  22     struct rrd_time_value last_up_tv;
  23     char *parsetime_error = NULL;
  24     long              long_tmp;
  25     int               rc;
  26
  27     while (1){
  28         static struct option long_options[] =
  29         {
  30             {"start",      required_argument, 0, 'b'},
  31             {"step",        required_argument,0,'s'},
  32             {0,0,0,0}
  33         };
  34         int option_index = 0;
  35         int opt;
  36         opt = getopt_long(argc, argv, "b:s:",
  37                           long_options, &option_index);
  38
  39         if (opt == EOF)
  40             break;
  41
  42         switch(opt) {
  43         case 'b':
  44             if ((parsetime_error = parsetime(optarg, &last_up_tv))) {
  45                 rrd_set_error("start time: %s", parsetime_error );
  46                 return(-1);
  47             }
  48             if (last_up_tv.type == RELATIVE_TO_END_TIME ||
  49                 last_up_tv.type == RELATIVE_TO_START_TIME) {
  50                 rrd_set_error("specifying time relative to the 'start' "
  51                               "or 'end' makes no sense here");
  52                 return(-1);
  53             }
  54
  55             last_up = mktime(&last_up_tv.tm) + last_up_tv.offset;
  56
  57             if (last_up < 3600*24*365*10){
  58                 rrd_set_error("the first entry to the RRD should be after 1980");
  59                 return(-1);
  60             }
  61             break;
  62
  63         case 's':
  64             long_tmp = atol(optarg);
  65             if (long_tmp < 1){
  66                 rrd_set_error("step size should be no less than one second");
  67                 return(-1);
  68             }
  69             pdp_step = long_tmp;
  70             break;
  71
  72         case '?':
  73             if (optopt != 0)
  74                 rrd_set_error("unknown option '%c'", optopt);
  75             else
  76                 rrd_set_error("unknown option '%s'",argv[optind-1]);
  77             return(-1);
  78         }
  79     }
  80
  81     rc = rrd_create_r(argv[optind],
  82                       pdp_step, last_up,
  83                       argc - optind - 1, argv + optind + 1);
  84
  85     return rc;
  86 }
  87
  88 /* #define DEBUG */
  89 int
  90 rrd_create_r(char *filename,
  91              unsigned long pdp_step, time_t last_up,
  92              int argc, char **argv)
  93 {
  94     rrd_t             rrd;
  95     long              i;
  96     int               offset;
  97     char *token;
  98     unsigned short token_idx, error_flag, period=0;
  99     unsigned long hashed_name;
 100
 101     /* init rrd clean */
 102     rrd_init(&rrd);
 103     /* static header */
 104     if((rrd.stat_head = calloc(1,sizeof(stat_head_t)))==NULL){
 105         rrd_set_error("allocating rrd.stat_head");
 106         return(-1);
 107     }
 108
 109     /* live header */
 110     if((rrd.live_head = calloc(1,sizeof(live_head_t)))==NULL){
 111         rrd_set_error("allocating rrd.live_head");
 112         return(-1);
 113     }
 114
 115     /* set some defaults */
 116     strcpy(rrd.stat_head->cookie,RRD_COOKIE);
 117     strcpy(rrd.stat_head->version,RRD_VERSION);
 118     rrd.stat_head->float_cookie = FLOAT_COOKIE;
 119     rrd.stat_head->ds_cnt = 0; /* this will be adjusted later */
 120     rrd.stat_head->rra_cnt = 0; /* ditto */
 121     rrd.stat_head->pdp_step = pdp_step; /* 5 minute default */
 122
 123     /* a default value */
 124     rrd.ds_def = NULL;
 125     rrd.rra_def = NULL;
 126
 127     rrd.live_head->last_up = last_up;
 128
 129         /* optind points to the first non-option command line arg,
 130          * in this case, the file name. */
 131         /* Compute the FNV hash value (used by SEASONAL and DEVSEASONAL
 132          * arrays. */
 133     hashed_name = FnvHash(filename);
 134     for(i=0;i<argc;i++){
 135         unsigned int ii;
 136         if (strncmp(argv[i],"DS:",3)==0){
 137             size_t old_size = sizeof(ds_def_t)*(rrd.stat_head->ds_cnt);
 138             if((rrd.ds_def = rrd_realloc(rrd.ds_def,
 139                                          old_size+sizeof(ds_def_t)))==NULL){
 140                 rrd_set_error("allocating rrd.ds_def");
 141                 rrd_free(&rrd);
 142                 return(-1);
 143             }
 144             memset(&rrd.ds_def[rrd.stat_head->ds_cnt], 0, sizeof(ds_def_t));
 145             /* extract the name and type */
 146             if (sscanf(&argv[i][3],
 147                        DS_NAM_FMT ":" DST_FMT ":%n",
 148                        rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
 149                        rrd.ds_def[rrd.stat_head->ds_cnt].dst,&offset) == 2)
 150             {
 151                 /* check for duplicate datasource names */
 152                 for(ii=0;ii<rrd.stat_head->ds_cnt;ii++)
 153                     if(strcmp(rrd.ds_def[rrd.stat_head->ds_cnt].ds_nam,
 154                               rrd.ds_def[ii].ds_nam) == 0){
 155                         rrd_set_error("Duplicate DS name: %s",rrd.ds_def[ii].ds_nam);
 156                     }
 157             } else {
 158                 rrd_set_error("invalid DS format");
 159             }
 160
 161             /* parse the remainder of the arguments */
 162             switch(dst_conv(rrd.ds_def[rrd.stat_head->ds_cnt].dst))
 163             {
 164             case DST_COUNTER:
 165             case DST_ABSOLUTE:
 166             case DST_GAUGE:
 167             case DST_DERIVE:
 168                 parseGENERIC_DS(&argv[i][offset+3],&rrd, rrd.stat_head->ds_cnt);
 169                 break;
 170             case DST_CDEF:
 171                 parseCDEF_DS(&argv[i][offset+3],&rrd, rrd.stat_head->ds_cnt);
 172                 break;
 173             default:
 174                 rrd_set_error("invalid DS type specified");
 175                 break;
 176             }
 177
 178             if (rrd_test_error()) {
 179                 rrd_free(&rrd);
 180                 return -1;
 181             }
 182             rrd.stat_head -> ds_cnt++;
 183         } else if (strncmp(argv[i],"RRA:",3)==0){
 184             char *tokptr;
 185             size_t old_size = sizeof(rra_def_t)*(rrd.stat_head->rra_cnt);
 186             if((rrd.rra_def = rrd_realloc(rrd.rra_def,
 187                                           old_size+sizeof(rra_def_t)))==NULL)
 188             {
 189                 rrd_set_error("allocating rrd.rra_def");
 190                 rrd_free(&rrd);
 191                 return(-1);
 192             }
 193             memset(&rrd.rra_def[rrd.stat_head->rra_cnt], 0, sizeof(rra_def_t));
 194
 195             token = strtok_r(&argv[i][4],":", &tokptr);
 196             token_idx = error_flag = 0;
 197             while (token != NULL)
 198             {
 199                 switch(token_idx)
 200                 {
 201                 case 0:
 202                     if (sscanf(token,CF_NAM_FMT,
 203                                rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) != 1)
 204                         rrd_set_error("Failed to parse CF name");
 205                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 206                     {
 207                     case CF_HWPREDICT:
 208                         /* initialize some parameters */
 209                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_alpha].u_val = 0.1;
 210                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_beta].u_val = 1.0/288;
 211                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 212                             rrd.stat_head -> rra_cnt;
 213                         break;
 214                     case CF_DEVSEASONAL:
 215                     case CF_SEASONAL:
 216                         /* initialize some parameters */
 217                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_seasonal_gamma].u_val = 0.1;
 218                         /* fall through */
 219                     case CF_DEVPREDICT:
 220                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt = -1;
 221                         break;
 222                     case CF_FAILURES:
 223                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_delta_pos].u_val = 2.0;
 224                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_delta_neg].u_val = 2.0;
 225                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_window_len].u_cnt = 3;
 226                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_failure_threshold].u_cnt = 2;
 227                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt = -1;
 228                         break;
 229                         /* invalid consolidation function */
 230                     case -1:
 231                         rrd_set_error("Unrecognized consolidation function %s",
 232                                       rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam);
 233                     default:
 234                         break;
 235                     }
 236                     /* default: 1 pdp per cdp */
 237                     rrd.rra_def[rrd.stat_head->rra_cnt].pdp_cnt = 1;
 238                     break;
 239                 case 1:
 240                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 241                     {
 242                     case CF_HWPREDICT:
 243                     case CF_DEVSEASONAL:
 244                     case CF_SEASONAL:
 245                     case CF_DEVPREDICT:
 246                     case CF_FAILURES:
 247                         rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt = atoi(token);
 248                         break;
 249                     default:
 250                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_cdp_xff_val].u_val = atof(token);
 251                         if (rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_cdp_xff_val].u_val<0.0 ||
 252                             rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_cdp_xff_val].u_val>=1.0)
 253                             rrd_set_error("Invalid xff: must be between 0 and 1");
 254                         break;
 255                     }
 256                     break;
 257                 case 2:
 258                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 259                     {
 260                     case CF_HWPREDICT:
 261                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_alpha].u_val = atof(token);
 262                         if (atof(token) <= 0.0 || atof(token) >= 1.0)
 263                             rrd_set_error("Invalid alpha: must be between 0 and 1");
 264                         break;
 265                     case CF_DEVSEASONAL:
 266                     case CF_SEASONAL:
 267                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_seasonal_gamma].u_val =
 268                             atof(token);
 269                         if (atof(token) <= 0.0 || atof(token) >= 1.0)
 270                             rrd_set_error("Invalid gamma: must be between 0 and 1");
 271                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_seasonal_smooth_idx].u_cnt
 272                             = hashed_name % rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt;
 273                         break;
 274                     case CF_FAILURES:
 275                         /* specifies the # of violations that constitutes the failure threshold */
 276                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_failure_threshold].u_cnt =
 277                             atoi(token);
 278                         if (atoi(token) < 1 || atoi(token) > MAX_FAILURES_WINDOW_LEN)
 279                             rrd_set_error("Failure threshold is out of range %d, %d",1,
 280                                           MAX_FAILURES_WINDOW_LEN);
 281                         break;
 282                     case CF_DEVPREDICT:
 283                         /* specifies the index (1-based) of CF_DEVSEASONAL array
 284                          * associated with this CF_DEVPREDICT array. */
 285                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 286                             atoi(token) - 1;
 287                         break;
 288                     default:
 289                         rrd.rra_def[rrd.stat_head->rra_cnt].pdp_cnt = atoi(token);
 290                         break;
 291                     }
 292                     break;
 293                 case 3:
 294                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 295                     {
 296                     case CF_HWPREDICT:
 297                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_hw_beta].u_val = atof(token);
 298                         if (atof(token) < 0.0 || atof(token) > 1.0)
 299                             rrd_set_error("Invalid beta: must be between 0 and 1");
 300                         break;
 301                     case CF_DEVSEASONAL:
 302                     case CF_SEASONAL:
 303                         /* specifies the index (1-based) of CF_HWPREDICT array
 304                          * associated with this CF_DEVSEASONAL or CF_SEASONAL array.
 305                          * */
 306                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 307                             atoi(token) - 1;
 308                         break;
 309                     case CF_FAILURES:
 310                         /* specifies the window length */
 311                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_window_len].u_cnt =
 312                             atoi(token);
 313                         if (atoi(token) < 1 || atoi(token) > MAX_FAILURES_WINDOW_LEN)
 314                             rrd_set_error("Window length is out of range %d, %d",1,
 315                                           MAX_FAILURES_WINDOW_LEN);
 316                         /* verify that window length exceeds the failure threshold */
 317                         if (rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_window_len].u_cnt <
 318                             rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_failure_threshold].u_cnt)
 319                             rrd_set_error("Window length is shorter than the failure threshold");
 320                         break;
 321                     case CF_DEVPREDICT:
 322                         /* shouldn't be any more arguments */
 323                         rrd_set_error("Unexpected extra argument for consolidation function DEVPREDICT");
 324                         break;
 325                     default:
 326                         rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt = atoi(token);
 327                         break;
 328                     }
 329                     break;
 330                 case 4:
 331                     switch(cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam))
 332                     {
 333                     case CF_FAILURES:
 334                         /* specifies the index (1-based) of CF_DEVSEASONAL array
 335                          * associated with this CF_DEVFAILURES array. */
 336                         rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 337                             atoi(token) - 1;
 338                         break;
 339                     case CF_HWPREDICT:
 340                         /* length of the associated CF_SEASONAL and CF_DEVSEASONAL arrays. */
 341                         period = atoi(token);
 342                         if (period > rrd.rra_def[rrd.stat_head->rra_cnt].row_cnt)
 343                             rrd_set_error("Length of seasonal cycle exceeds length of HW prediction array");
 344                         break;
 345                     default:
 346                         /* shouldn't be any more arguments */
 347                         rrd_set_error("Unexpected extra argument for consolidation function %s",
 348                                       rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam);
 349                         break;
 350                     }
 351                     break;
 352                 case 5:
 353                     /* If we are here, this must be a CF_HWPREDICT RRA.
 354                      * Specifies the index (1-based) of CF_SEASONAL array
 355                      * associated with this CF_HWPREDICT array. If this argument
 356                      * is missing, then the CF_SEASONAL, CF_DEVSEASONAL, CF_DEVPREDICT,
 357                      * CF_FAILURES.
 358                      * arrays are created automatically. */
 359                     rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt =
 360                         atoi(token) - 1;
 361                     break;
 362                 default:
 363                     /* should never get here */
 364                     rrd_set_error("Unknown error");
 365                     break;
 366                 } /* end switch */
 367                 if (rrd_test_error())
 368                 {
 369                     /* all errors are unrecoverable */
 370                     rrd_free(&rrd);
 371                     return (-1);
 372                 }
 373                 token = strtok_r(NULL,":", &tokptr);
 374                 token_idx++;
 375             } /* end while */
 376 #ifdef DEBUG
 377             fprintf(stderr,"Creating RRA CF: %s, dep idx %lu, current idx %lu\n",
 378                     rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam,
 379                     rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt,
 380                     rrd.stat_head -> rra_cnt);
 381 #endif
 382             /* should we create CF_SEASONAL, CF_DEVSEASONAL, and CF_DEVPREDICT? */
 383             if (cf_conv(rrd.rra_def[rrd.stat_head->rra_cnt].cf_nam) == CF_HWPREDICT
 384                 && rrd.rra_def[rrd.stat_head->rra_cnt].par[RRA_dependent_rra_idx].u_cnt
 385                 == rrd.stat_head -> rra_cnt)
 386             {
 387 #ifdef DEBUG
 388                 fprintf(stderr,"Creating HW contingent RRAs\n");
 389 #endif
 390                 if (create_hw_contingent_rras(&rrd,period,hashed_name) == -1) {
 391                     rrd_free(&rrd);
 392                     return -1;
 393                 }
 394             }
 395             rrd.stat_head->rra_cnt++;
 396         } else {
 397             rrd_set_error("can't parse argument '%s'",argv[i]);
 398             rrd_free(&rrd);
 399             return -1;
 400         }
 401     }
 402
 403
 404     if (rrd.stat_head->rra_cnt < 1){
 405         rrd_set_error("you must define at least one Round Robin Archive");
 406         rrd_free(&rrd);
 407         return(-1);
 408     }
 409
 410     if (rrd.stat_head->ds_cnt < 1){
 411         rrd_set_error("you must define at least one Data Source");
 412         rrd_free(&rrd);
 413         return(-1);
 414     }
 415     return rrd_create_fn(filename, &rrd);
 416 }
 417
 418 void parseGENERIC_DS(char *def,rrd_t *rrd, int ds_idx)
 419 {
 420     char minstr[DS_NAM_SIZE], maxstr[DS_NAM_SIZE];
 421     /*
 422       int temp;
 423
 424       temp = sscanf(def,"%lu:%18[^:]:%18[^:]",
 425       &(rrd -> ds_def[ds_idx].par[DS_mrhb_cnt].u_cnt),
 426       minstr,maxstr);
 427     */
 428     if (sscanf(def,"%lu:%18[^:]:%18[^:]",
 429                &(rrd -> ds_def[ds_idx].par[DS_mrhb_cnt].u_cnt),
 430                minstr,maxstr) == 3)
 431     {
 432         if (minstr[0] == 'U' && minstr[1] == 0)
 433             rrd -> ds_def[ds_idx].par[DS_min_val].u_val = DNAN;
 434         else
 435             rrd -> ds_def[ds_idx].par[DS_min_val].u_val = atof(minstr);
 436
 437         if (maxstr[0] == 'U' && maxstr[1] == 0)
 438             rrd -> ds_def[ds_idx].par[DS_max_val].u_val = DNAN;
 439         else
 440             rrd -> ds_def[ds_idx].par[DS_max_val].u_val  = atof(maxstr);
 441
 442         if (! isnan(rrd -> ds_def[ds_idx].par[DS_min_val].u_val) &&
 443             ! isnan(rrd -> ds_def[ds_idx].par[DS_max_val].u_val) &&
 444             rrd -> ds_def[ds_idx].par[DS_min_val].u_val
 445             >= rrd -> ds_def[ds_idx].par[DS_max_val].u_val ) {
 446             rrd_set_error("min must be less than max in DS definition");
 447             return;
 448         }
 449     } else {
 450         rrd_set_error("failed to parse data source %s", def);
 451     }
 452 }
 453
 454 /* Create the CF_DEVPREDICT, CF_DEVSEASONAL, CF_SEASONAL, and CF_FAILURES RRAs
 455  * associated with a CF_HWPREDICT RRA. */
 456 int
 457 create_hw_contingent_rras(rrd_t *rrd, unsigned short period, unsigned long hashed_name)
 458 {
 459     size_t old_size;
 460     rra_def_t* current_rra;
 461
 462     /* save index to CF_HWPREDICT */
 463     unsigned long hw_index = rrd -> stat_head -> rra_cnt;
 464     /* advance the pointer */
 465     (rrd -> stat_head -> rra_cnt)++;
 466     /* allocate the memory for the 4 contingent RRAs */
 467     old_size = sizeof(rra_def_t)*(rrd -> stat_head->rra_cnt);
 468     if ((rrd -> rra_def = rrd_realloc(rrd -> rra_def,
 469                                       old_size+4*sizeof(rra_def_t)))==NULL)
 470     {
 471         rrd_set_error("allocating rrd.rra_def");
 472         return(-1);
 473     }
 474     /* clear memory */
 475     memset(&(rrd -> rra_def[rrd -> stat_head->rra_cnt]), 0, 4*sizeof(rra_def_t));
 476
 477     /* create the CF_SEASONAL RRA */
 478     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 479     strcpy(current_rra -> cf_nam,"SEASONAL");
 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     rrd -> rra_def[hw_index].par[RRA_dependent_rra_idx].u_cnt = rrd -> stat_head -> rra_cnt;
 487
 488     /* create the CF_DEVSEASONAL RRA */
 489     (rrd -> stat_head -> rra_cnt)++;
 490     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 491     strcpy(current_rra -> cf_nam,"DEVSEASONAL");
 492     current_rra -> row_cnt = period;
 493     current_rra -> par[RRA_seasonal_smooth_idx].u_cnt = hashed_name % period;
 494     current_rra -> pdp_cnt = 1;
 495     current_rra -> par[RRA_seasonal_gamma].u_val =
 496         rrd -> rra_def[hw_index].par[RRA_hw_alpha].u_val;
 497     current_rra -> par[RRA_dependent_rra_idx].u_cnt = hw_index;
 498
 499     /* create the CF_DEVPREDICT RRA */
 500     (rrd -> stat_head -> rra_cnt)++;
 501     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 502     strcpy(current_rra -> cf_nam,"DEVPREDICT");
 503     current_rra -> row_cnt = (rrd -> rra_def[hw_index]).row_cnt;
 504     current_rra -> pdp_cnt = 1;
 505     current_rra -> par[RRA_dependent_rra_idx].u_cnt
 506         = hw_index + 2; /* DEVSEASONAL */
 507
 508     /* create the CF_FAILURES RRA */
 509     (rrd -> stat_head -> rra_cnt)++;
 510     current_rra = &(rrd -> rra_def[rrd -> stat_head -> rra_cnt]);
 511     strcpy(current_rra -> cf_nam,"FAILURES");
 512     current_rra -> row_cnt = period;
 513     current_rra -> pdp_cnt = 1;
 514     current_rra -> par[RRA_delta_pos].u_val = 2.0;
 515     current_rra -> par[RRA_delta_neg].u_val = 2.0;
 516     current_rra -> par[RRA_failure_threshold].u_cnt = 7;
 517     current_rra -> par[RRA_window_len].u_cnt = 9;
 518     current_rra -> par[RRA_dependent_rra_idx].u_cnt =
 519         hw_index + 2; /* DEVSEASONAL */
 520     return 0;
 521 }
 522
 523 /* create and empty rrd file according to the specs given */
 524
 525 int
 526 rrd_create_fn(char *file_name, rrd_t *rrd)
 527 {
 528     unsigned long    i,ii;
 529     FILE             *rrd_file;
 530     rrd_value_t      *unknown;
 531     int unkn_cnt;
 532
 533     if ((rrd_file = fopen(file_name,"wb")) == NULL ) {
 534         rrd_set_error("creating '%s': %s",file_name, rrd_strerror(errno));
 535         free(rrd->stat_head);
 536         free(rrd->ds_def);
 537         free(rrd->rra_def);
 538         return(-1);
 539     }
 540
 541     fwrite(rrd->stat_head,
 542            sizeof(stat_head_t), 1, rrd_file);
 543
 544     fwrite(rrd->ds_def,
 545            sizeof(ds_def_t), rrd->stat_head->ds_cnt, rrd_file);
 546
 547     fwrite(rrd->rra_def,
 548            sizeof(rra_def_t), rrd->stat_head->rra_cnt, rrd_file);
 549
 550     fwrite(rrd->live_head,
 551            sizeof(live_head_t),1, rrd_file);
 552
 553     if((rrd->pdp_prep = calloc(1,sizeof(pdp_prep_t))) == NULL){
 554         rrd_set_error("allocating pdp_prep");
 555         rrd_free(rrd);
 556         fclose(rrd_file);
 557         return(-1);
 558     }
 559
 560     strcpy(rrd->pdp_prep->last_ds,"UNKN");
 561
 562     rrd->pdp_prep->scratch[PDP_val].u_val = 0.0;
 563     rrd->pdp_prep->scratch[PDP_unkn_sec_cnt].u_cnt =
 564         rrd->live_head->last_up % rrd->stat_head->pdp_step;
 565
 566     for(i=0; i < rrd->stat_head->ds_cnt; i++)
 567         fwrite( rrd->pdp_prep,sizeof(pdp_prep_t),1,rrd_file);
 568
 569     if((rrd->cdp_prep = calloc(1,sizeof(cdp_prep_t))) == NULL){
 570         rrd_set_error("allocating cdp_prep");
 571         rrd_free(rrd);
 572         fclose(rrd_file);
 573         return(-1);
 574     }
 575
 576
 577     for(i=0; i < rrd->stat_head->rra_cnt; i++) {
 578        switch (cf_conv(rrd->rra_def[i].cf_nam))
 579            {
 580            case CF_HWPREDICT:
 581                init_hwpredict_cdp(rrd->cdp_prep);
 582                break;
 583            case CF_SEASONAL:
 584            case CF_DEVSEASONAL:
 585                init_seasonal_cdp(rrd->cdp_prep);
 586                break;
 587            case CF_FAILURES:
 588                /* initialize violation history to 0 */
 589                for (ii = 0; ii < MAX_CDP_PAR_EN; ii++)
 590                {
 591                                 /* We can zero everything out, by setting u_val to the
 592                                  * NULL address. Each array entry in scratch is 8 bytes
 593                                  * (a double), but u_cnt only accessed 4 bytes (long) */
 594                    rrd->cdp_prep->scratch[ii].u_val = 0.0;
 595                }
 596                break;
 597            default:
 598                /* can not be zero because we don't know anything ... */
 599                rrd->cdp_prep->scratch[CDP_val].u_val = DNAN;
 600                /* startup missing pdp count */
 601                rrd->cdp_prep->scratch[CDP_unkn_pdp_cnt].u_cnt =
 602                    ((rrd->live_head->last_up -
 603                  rrd->pdp_prep->scratch[PDP_unkn_sec_cnt].u_cnt)
 604                     % (rrd->stat_head->pdp_step
 605                        * rrd->rra_def[i].pdp_cnt)) / rrd->stat_head->pdp_step;
 606                break;
 607            }
 608
 609        for(ii=0; ii < rrd->stat_head->ds_cnt; ii++)
 610        {
 611            fwrite( rrd->cdp_prep,sizeof(cdp_prep_t),1,rrd_file);
 612        }
 613     }
 614
 615     /* now, we must make sure that the rest of the rrd
 616        struct is properly initialized */
 617
 618     if((rrd->rra_ptr = calloc(1,sizeof(rra_ptr_t))) == NULL) {
 619         rrd_set_error("allocating rra_ptr");
 620         rrd_free(rrd);
 621         fclose(rrd_file);
 622         return(-1);
 623     }
 624
 625     /* changed this initialization to be consistent with
 626      * rrd_restore. With the old value (0), the first update
 627      * would occur for cur_row = 1 because rrd_update increments
 628      * the pointer a priori. */
 629     for (i=0; i < rrd->stat_head->rra_cnt; i++)
 630     {
 631         rrd->rra_ptr->cur_row = rrd->rra_def[i].row_cnt - 1;
 632         fwrite( rrd->rra_ptr, sizeof(rra_ptr_t),1,rrd_file);
 633     }
 634
 635     /* write the empty data area */
 636     if ((unknown = (rrd_value_t *)malloc(512 * sizeof(rrd_value_t))) == NULL) {
 637         rrd_set_error("allocating unknown");
 638         rrd_free(rrd);
 639         fclose(rrd_file);
 640         return(-1);
 641     }
 642     for (i = 0; i < 512; ++i)
 643         unknown[i] = DNAN;
 644
 645     unkn_cnt = 0;
 646     for (i = 0; i < rrd->stat_head->rra_cnt; i++)
 647         unkn_cnt += rrd->stat_head->ds_cnt * rrd->rra_def[i].row_cnt;
 648
 649     while (unkn_cnt > 0) {
 650         fwrite(unknown, sizeof(rrd_value_t), min(unkn_cnt, 512), rrd_file);
 651         unkn_cnt -= 512;
 652      }
 653     free(unknown);
 654
 655     /* lets see if we had an error */
 656     if(ferror(rrd_file)){
 657         rrd_set_error("a file error occurred while creating '%s'",file_name);
 658         fclose(rrd_file);
 659         rrd_free(rrd);
 660         return(-1);
 661     }
 662
 663     fclose(rrd_file);
 664     rrd_free(rrd);
 665     return (0);
 666 }