Problems with IO.popen in ruby 1.8.2?


#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:inloop’
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?


#2

On Jun 5, 2007, at 1:02 PM, Todd A. Jacobs wrote:

  from ./dice.rb:89:in `read'

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


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– Doctor Who, “Destiny of the Daleks”

-a