From: Brian Candler <b.candler@...>
Date: 2010-03-10T21:12:11+09:00
Subject: Re: how to test if a file is open ?

Giampiero Zanchi wrote:
> You could use exceptions

I thought the OP was interested in whether *another* process had the 
same file open.

If you just want to test whether a Ruby File object is closed, there is 
a 'closed?' method.

irb(main):002:0> f = File.open("/etc/passwd")
=> #<File:/etc/passwd>
irb(main):003:0> f.closed?
=> false
irb(main):004:0> f.close
=> nil
irb(main):005:0> f.closed?
=> true
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