src/rrd_first.c

   1 /*****************************************************************************
   2  * RRDtool 1.2rc3  Copyright by Tobi Oetiker, 1997-2005
   3  *****************************************************************************
   4  * rrd_first Return
   5  *****************************************************************************
   6  * Initial version by Burton Strauss, ntopSupport.com - 3/2005
   7  *****************************************************************************/
   8
   9 #include "rrd_tool.h"
  10
  11
  12 time_t
  13 rrd_first(int argc, char **argv)
  14 {
  15     int target_rraindex=0;
  16     char *endptr;
  17
  18     while (1){
  19         static struct option long_options[] =
  20         {
  21             {"rraindex", required_argument, 0, 129},
  22             {0,0,0,0}
  23         };
  24         int option_index = 0;
  25         int opt;
  26         opt = getopt_long(argc, argv, "", long_options, &option_index);
  27
  28         if(opt == EOF)
  29             break;
  30
  31         switch(opt) {
  32           case 129:
  33             target_rraindex=strtol(optarg,&endptr,0);
  34             if(target_rraindex < 0) {
  35                 rrd_set_error("invalid rraindex number");
  36                 return(-1);
  37             }
  38             break;
  39           default:
  40             rrd_set_error("usage rrdtool %s [--rraindex number] file.rrd", argv[0]);
  41             return(-1);
  42         }
  43     }
  44
  45     if(optind >= argc){
  46         rrd_set_error("not enough arguments");
  47         return -1;
  48     }
  49
  50     return(rrd_first_r(argv[optind], target_rraindex));
  51 }
  52
  53
  54 time_t
  55 rrd_first_r(const char *filename, const int rraindex)
  56 {
  57     long rra_start,
  58          timer;
  59     time_t then;
  60     FILE *in_file;
  61     rrd_t rrd;
  62
  63     if(rrd_open(filename,&in_file,&rrd, RRD_READONLY)==-1){
  64         rrd_set_error("could not open RRD");
  65         return(-1);
  66     }
  67
  68     if((rraindex < 0) || (rraindex >= (int)rrd.stat_head->rra_cnt)) {
  69         rrd_set_error("invalid rraindex number");
  70         return(-1);
  71     }
  72
  73     rra_start = ftell(in_file);
  74     fseek(in_file,
  75           (rra_start +
  76            (rrd.rra_ptr[rraindex].cur_row+1) *
  77            rrd.stat_head->ds_cnt *
  78            sizeof(rrd_value_t)),
  79           SEEK_SET);
  80     timer = - (rrd.rra_def[rraindex].row_cnt-1);
  81     if (rrd.rra_ptr[rraindex].cur_row + 1 > rrd.rra_def[rraindex].row_cnt) {
  82       fseek(in_file,rra_start,SEEK_SET);
  83     }
  84     then = (rrd.live_head->last_up -
  85             rrd.live_head->last_up %
  86             (rrd.rra_def[rraindex].pdp_cnt*rrd.stat_head->pdp_step)) +
  87            (timer *
  88             rrd.rra_def[rraindex].pdp_cnt*rrd.stat_head->pdp_step);
  89
  90     rrd_free(&rrd);
  91     fclose(in_file);
  92     return(then);
  93 }
  94
  95
  96
  97