From: dlinsky@... (Dario Linsky)
Date: 2004-04-24T00:14:10+09:00
Subject: Talking with processes

Hi,

I am trying to open an external process that normally reads and writes from 
stdin/to stdout. For opening a pipe to this process I am using IO.popen.

Reading each line from the pipe is no problem until it comes to a point where 
the external process wants to get some data from stdin and it waits for input.

Now when I write something into the IO stream I need to call IO#close_write for 
further reading. But since the pipe is closed now, I cannot write to it any 
more.

For example:
-- snip --
pipe = IO.popen("ruby -r debug script.rb", "w+")
if pipe
  while line = pipe.gets
    line.chomp!
    puts line
    if line =~ /^script\.rb:\d+\:.+$/ # Regexp to find special lines
      # Here I want to tell the debugger what to do and
      # get further output to evaluate.
      pipe.puts "next"
      pipe.close_write
  end
end
-- snap --

Is there any way to reopen the pipe at the position where I close it or is there
any way to avoid using IO#close_write so I can write more commands to the 
debugger?

Greetings, Dario