use IPC::Open2;

local(*HIS_OUT, *HIS_IN);  # Create local handles if needed.

$childpid = open2(*HIS_OUT, *HIS_IN, $program, @args)
    or die "can't open pipe to $program: $!";
print HIS_IN "here's your input\n";
$his_output = <HIS_IN>;
close(HIS_OUT);
close(README);
waitpid($childpid, 0);