Use close (implicitly or explicitly) with open, not waitpid. 
$ perl -E'
   open(my $pipe, "-|", "perl -e'\''sleep 5; exit 3'\''");
   say time;
   close($pipe);
   say time;
   say $?>>8;
'
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1280645569
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In reply to Re^2: open with pipe by ikegami
in thread open with pipe by daverave

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