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  1. or download this
           lockfile can be used  to  create  one  or  more  semaphore
       files.   If  lockfile can't create all the specified files
...
       is  returned.   If  the  number of retries is -1 (default,
       i.e., -r-1) lockfile will retry forever.
  2. or download this
    sysopen($fh, "$dir/$name", O_CREAT | O_EXCL | O_RDWR, 0600);