From: Giampiero Zanchi <cidza@...>
Date: 2010-03-10T20:50:49+09:00
Subject: Re: how to test if a file is open ?

You could use exceptions
try to read from file; if it is closed, then an exception will be 
raised; then you can do something, for instance set a boolean and return 
it...

def is_open(a_file)
  begin
    ...read from file...
  rescue
    ...if file is not open then do something...
  end
end
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