IPC::Open2 ought to work for this, but in case it doesn't, you could try saving the output of "function()" to a file, and running the backtick command with redirection of stdin, something like this: 
open( CONF, ">function.conf" ) or die $!;
print CONF function();
close CONF;

$result = `program < function.conf`;

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In reply to Re: piping a function into a backtick shell by graff
in thread piping a function into a backtick shell by drawde83

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