src/proc_uptime.c

   1 #include "common.h"
   2
   3 int do_proc_uptime(int update_every, usec_t dt) {
   4     (void)dt;
   5
   6     static RRDSET *st = NULL;
   7     collected_number uptime = 0;
   8
   9 #ifdef CLOCK_BOOTTIME_IS_AVAILABLE
  10     uptime = now_boottime_usec() / 1000;
  11 #else
  12     static procfile *ff = NULL;
  13
  14     if(unlikely(!ff)) {
  15         char filename[FILENAME_MAX + 1];
  16         snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/uptime");
  17
  18         ff = procfile_open(config_get("plugin:proc:/proc/uptime", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
  19         if(unlikely(!ff))
  20             return 1;
  21     }
  22
  23     ff = procfile_readall(ff);
  24     if(unlikely(!ff))
  25         return 0; // we return 0, so that we will retry to open it next time
  26
  27     if(unlikely(procfile_lines(ff) < 1)) {
  28         error("/proc/uptime has no lines.");
  29         return 1;
  30     }
  31     if(unlikely(procfile_linewords(ff, 0) < 1)) {
  32         error("/proc/uptime has less than 1 word in it.");
  33         return 1;
  34     }
  35
  36     uptime = (collected_number)(strtold(procfile_lineword(ff, 0, 0), NULL) * 1000.0);
  37 #endif
  38
  39     // --------------------------------------------------------------------
  40
  41     if(unlikely(!st))
  42         st = rrdset_find_localhost("system.uptime");
  43
  44     if(unlikely(!st)) {
  45         st = rrdset_create_localhost("system", "uptime", NULL, "uptime", NULL, "System Uptime", "seconds", 1000
  46                                      , update_every, RRDSET_TYPE_LINE);
  47         rrddim_add(st, "uptime", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
  48     }
  49     else rrdset_next(st);
  50
  51     rrddim_set(st, "uptime", uptime);
  52     rrdset_done(st);
  53
  54     return 0;
  55 }