I haven't worked with it myself, but maybe you can take a look at IO::Scalar.

from the manpage:

           use 5.005;
           use IO::Scalar;
           $data = "My message:\n";

           ### Open a handle on a string, and append to it:
           $SH = new IO::Scalar \$data;
           print $SH "Hello";
           print $SH ", world!\nBye now!\n";
           print "The string is now: ", $data, "\n";

           ### Open a handle on a string, read it line-by-line, then c
+lose it:
           $SH = new IO::Scalar \$data;
           while (<$SH>) {
               print "Got line: $_";
           }
           close $SH;
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So IMHO you should be able to redirect STDOUT and STDERR to an IO::Scalar object, and read the data back when you need it.

Isn't perl nice? :-)

-- 
Joost       downtime n. The period during which a system
            is error-free and immune from user input.
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