From: Dan Janowski <danj@3skel.com>
Date: 2004-04-30T03:33:39+09:00
Subject: Re: popen issues

I think putting the process in a pty will give you better control.

Dan

On Apr 27, 2004, at 17:06, Hal Fulton wrote:

> Here's something I've never figured out.
>
> Suppose I want real two-way communication with a process via popen.
> This seems doable.
>
> But apparently the read hangs until I do a close_write; and if I
> do that, I can't write again. A flush doesn't work.
>
> Here's what I was thinking (simplified):
>
>   io = IO.popen("/bin/bash","r+") do |f|
>     f.puts "ls"
>     puts f.readlines
>     f.puts "date"
>     puts f.readlines
>   end
>
> I even tried this (following) abomination, to no avail:
>
>   io = IO.popen("/bin/bash","r+") do |f|
>     writer = f.dup
>     f.puts "ls\n"
>     f.close_write
>     puts f.readlines
>     w = writer.dup
>     w.puts "date\n"
>     w.close_write
>     puts f.readlines
>   end
>
>
> Can someone advise?
>
>
> Hal
>
>
>