From: Michal Suchanek <hramrach@...>
Date: 2008-08-21T16:50:51+09:00
Subject: [ruby-core:18361] Ruby popen bug #1, isolated

Hello

It looks like the problems with IO.popen I see have multiple causes,
and the fact that repeatedly calling popen fails is not in itself
enough to isolate a particular problem.

However, I was trying to put my code into a shape that would work on
JRuby at least, and found a test that reproducibly fails on ~100
iterations for me.

With this test I get EBADF on ruby 1.8.5 after 107 iterations and on
1.8.7 anfter 104 iterations, always.

Since I got a version of the code that hopefully works for me I guess
I won't look into the other problems any time soon.

Thanks

Michal

ruby 1.8.5 (2006-08-25) [x86_64-linux]

ruby 1.8.7 (2008-06-20 patchlevel 22) [x86_64-linux]


def try_analyze *words
 analyzer = IO.popen( 'cat', IO::RDWR )
 res = []

 t = Thread.new(  (IO::for_fd analyzer.fileno),res){|fd,ary|
   while l = fd.gets do
     STDERR.putc 8
     ary.push l
   end
   fd.close rescue nil # hopefully prevents zombie hordes
 }

 words.each{|w|
   STDERR.putc '.'[0]
   analyzer.puts w
 }

 analyzer.close_write rescue nil
 t.join
end

1.upto(10000){|_|
 try_analyze *%w(a b c d e f g h i)
 STDERR.puts _
}