[rrd-developers] Re: BUG: attempt to put segment in horiz list twice ??

Ruud H.G. van Tol rvtol at isolution.nl
Wed Jul 27 14:21:02 MEST 2005

Per Jessen:
> Ruud H.G. van Tol:
>> Per:

>>> As the problem was that the PNG ended up being invalid
>>> because of the stderr warnings from libart, I figured I would just
>>> close stderr before I do the system() call.
>> Why not just redirect stderr to a different handle?
>> What programming language do you use?
> I use C - and yes, I did try redirecting stderr to a different handle.

OK, but then I don't understand how the stderr-data could get mixed with
the PNG-data. Or did I understand that wrong?
Does libart maybe send error messages to stdout too?

In PHP, this is handy: ob_start(); passthru("command"); $var =
ob_get_contents(); ob_end_flush(); ob_end_clean().

In a system() call, you can append " 2>$tmpfile" to the commandline.

(my apologies for stating the/your obvious)

Grtz, Ruud

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