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open("/tmp/PerlIO_Ol6dlF", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
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Use of uninitialized value in open at ./799021.pl line 32.
open("", O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 ENOENT (No such file or 
+directory)
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    As a special case the 3-arg form with a read/write mode and the
    third argument being "undef":
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        open(TMP, "+>", undef) or die ...

    opens a filehandle to an anonymous temporary file.