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Old 02-25-2004, 12:58 AM   #1
D M Mehta
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Question How to get System UpTime using C program ?

How do we get the system up time using C programming in Linux ??
i.e how to get the time when the system started using C Program.??
Old 02-25-2004, 01:47 AM   #2
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This is how GNU's coreutils
uptime does it

  fp = fopen ("/proc/uptime", "r");
  if (fp != NULL)
      char buf[BUFSIZ];
      int res;
      char *b = fgets (buf, BUFSIZ, fp);
      if (b == buf)
          /* The following sscanf must use the C locale.  */
          setlocale (LC_NUMERIC, "C");
          res = sscanf (buf, "%lf", &upsecs);
          setlocale (LC_NUMERIC, "");
          if (res == 1)
            uptime = (time_t) upsecs;

      fclose (fp);



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