Problems with IO.popen in ruby 1.8.2?

ruby-talk
1

I have the following code snippet:

    sleep 0.3
    IO.popen('/usr/bin/xclip -o').readlines {|f| print}

running in a tight loop. If I let it run for a short time (about 25
seconds), I get this error:

    Enter URL: ./dice.rb:89:in `popen': Too many open files - /usr/bin/xclip -o (Errno::EMFILE)
      from ./dice.rb:89:in `read'
      from ./dice.rb:181
      from ./dice.rb:162:in `loop'
      from ./dice.rb:162

I don't understand the nature of the error, since the pipe is implicitly
closed when the block exits, right? Event if I change the line to:

    IO.popen('/usr/bin/xclip -o').readlines {|f| print; f.close}

I still have the same problem. So, what file resource is being consumed,
and how do I fix it?

···

--
"Oh, look: rocks!"
  -- Doctor Who, "Destiny of the Daleks"

2

I have the following code snippet:

    sleep 0.3
    IO.popen('/usr/bin/xclip -o').readlines {|f| print}

running in a tight loop. If I let it run for a short time (about 25
seconds), I get this error:

    Enter URL: ./dice.rb:89:in `popen': Too many open files - /usr/bin/xclip -o (Errno::EMFILE)
      from ./dice.rb:89:in `read'
      from ./dice.rb:181
      from ./dice.rb:162:in `loop'
      from ./dice.rb:162

I don't understand the nature of the error, since the pipe is implicitly
closed when the block exits, right? Event if I change the line to:

    IO.popen('/usr/bin/xclip -o').readlines {|f| print; f.close}

I still have the same problem. So, what file resource is being consumed,
and how do I fix it?

read carefully - you've given the block to readlines - not popen. invert your logic

  IO.popen(cmd) do |pipe|
           pipe.readlines{|line| print line}
         end

--
"Oh, look: rocks!"
  -- Doctor Who, "Destiny of the Daleks"

-a

···

On Jun 5, 2007, at 1:02 PM, Todd A. Jacobs wrote:
--
we can deny everything, except that we have the possibility of being better. simply reflect on that.
h.h. the 14th dalai lama