src/rrd_first.c

   1 /*****************************************************************************
   2  * RRDtool 1.2.9  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     optind = 0; opterr = 0;  /* initialize getopt */
  18
  19     while (1){
  20         static struct option long_options[] =
  21         {
  22             {"rraindex", required_argument, 0, 129},
  23             {0,0,0,0}
  24         };
  25         int option_index = 0;
  26         int opt;
  27         optind = 0; opterr = 0;  /* initialize getopt */
  28         opt = getopt_long(argc, argv, "", long_options, &option_index);
  29
  30         if(opt == EOF)
  31             break;
  32
  33         switch(opt) {
  34           case 129:
  35             target_rraindex=strtol(optarg,&endptr,0);
  36             if(target_rraindex < 0) {
  37                 rrd_set_error("invalid rraindex number");
  38                 return(-1);
  39             }
  40             break;
  41           default:
  42             rrd_set_error("usage rrdtool %s [--rraindex number] file.rrd", argv[0]);
  43             return(-1);
  44         }
  45     }
  46
  47     if(optind >= argc){
  48         rrd_set_error("not enough arguments");
  49         return -1;
  50     }
  51
  52     return(rrd_first_r(argv[optind], target_rraindex));
  53 }
  54
  55
  56 time_t
  57 rrd_first_r(const char *filename, const int rraindex)
  58 {
  59     long rra_start,
  60          timer;
  61     time_t then;
  62     FILE *in_file;
  63     rrd_t rrd;
  64
  65     if(rrd_open(filename,&in_file,&rrd, RRD_READONLY)==-1){
  66         rrd_set_error("could not open RRD");
  67         return(-1);
  68     }
  69
  70     if((rraindex < 0) || (rraindex >= (int)rrd.stat_head->rra_cnt)) {
  71         rrd_set_error("invalid rraindex number");
  72         return(-1);
  73     }
  74
  75     rra_start = ftell(in_file);
  76     fseek(in_file,
  77           (rra_start +
  78            (rrd.rra_ptr[rraindex].cur_row+1) *
  79            rrd.stat_head->ds_cnt *
  80            sizeof(rrd_value_t)),
  81           SEEK_SET);
  82     timer = - (rrd.rra_def[rraindex].row_cnt-1);
  83     if (rrd.rra_ptr[rraindex].cur_row + 1 > rrd.rra_def[rraindex].row_cnt) {
  84       fseek(in_file,rra_start,SEEK_SET);
  85     }
  86     then = (rrd.live_head->last_up -
  87             rrd.live_head->last_up %
  88             (rrd.rra_def[rraindex].pdp_cnt*rrd.stat_head->pdp_step)) +
  89            (timer *
  90             rrd.rra_def[rraindex].pdp_cnt*rrd.stat_head->pdp_step);
  91
  92     rrd_free(&rrd);
  93     fclose(in_file);
  94     return(then);
  95 }
  96
  97
  98
  99