From: Oliver Peng <oliver.peng@...>
Date: 2009-05-08T22:55:31+09:00
Subject: Re: how to find and close opened file descriptor

Roger Pack wrote:
>> And now I am assuming the maximum file no is 1023. Is there any way that
>> I can get the maximum file no?
> 
> You could run a loop at the beginning of your script which detects it :)
> 
> count = 0
> all = []
> begin
>  loop { all << File.open('test','w') }
> rescue Exception
>  count = all.length
>  for file in all do; file.close; end
> end
> count
> 
> But getting back to your original question, another way to close 
> descriptors is
> GC.each_object(IO) do |io| io.close; end
> 
> I guess.  Not totally sure what you mean by "doesnt create file 
> descriptors for each inherited object" ?
> Thanks.
> -=r

At first, I also try to find all IO objects and close. Here is the code:

ObjectSpace.each_object(IO) do |io|
    begin
      unless io.closed?
        io.close
      end
    rescue ::Exception
    end
end

But it doesn't work because ruby doesn't create IO object for the open 
file descriptor which are inherited from parent process.
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