Another contributory factor might be that you are opening STDIN for output instead of input i.e. more normal would be: 
open STDIN, '/dev/null'  || die "Can't read /dev/null: $!";

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In reply to Re^3: Perl migration hp-ux -> Linux ( perlport, File::Spec->devnull ) by anonymized user 468275
in thread Perl migration hp-ux -> Linux by vccs

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