open2 does not work in mod perl

[<suppressed>]

Hi all

I am able to execute the below program in perl but NOT in mod_perl

$pid = open2(*Reader,*Writer,$test_cmd);
Writer->autoflush();
Reader->autoflush();

print Writer "mypwd\n";
while (<Reader>) {
$output .= $_;
}

In mod perl , whatever I write to Writer using "print Writer " does not get reached to my program defined in $test_cmd. This works perfectly fine with only perl but not with mod perl,what might be the reason and any workaround

Any help would be greatly appreciated

Thanks
Sajid

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