[rrd-users] Re: C documentation?

Jason Fesler jfesler at gigo.com
Tue Jun 24 17:20:27 MEST 2003

> I noticed some declarations in rrd.h and I was able to link some code to
> try out calling rrd_create(), but I couldn't find any documentation on
> this (or any of the other rrd_ functions).

the rrd* man pages for the "rrdtool" commands is your best guide;

> My guess is that the first argument is the number of string arguments,
> and the second is an array of character strings.  Can someone confirm
> this?

This is true.  You specifically generate ascii strings, and build up an
argc/argv pair.  The first string in argv would be "create" or "update"

I snarfed CountArgs and CreateArgs from rrd_tool.c , and used them roughly
like this:

argc = CountArgs (buffer);
      if ((myargv = (char **) malloc ((argc + 1) * sizeof (char *))) == NULL)
          perror ("malloc");
          exit (1);

      if ((argc = CreateArgs ("portstats", buffer, argc, myargv)) < 0)
          fprintf (stderr, "ERROR: creating arguments\n");
          exit (1);
      result = rrd_create (argc - 1, &myargv[1]);
      free (myargv);

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