From: "Ara.T.Howard" <ahoward@...>
Date: 2004-04-30T04:14:02+09:00
Subject: Re: popen issues

On Fri, 30 Apr 2004, Dan Janowski wrote:

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

dan-

have you seen my session package?  do you think i should re-vamp this to run
all processes in a pty?  i can't think of a good reason NOT to at this point,
but aren't currently...

-a

> 
> 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
> >
> >
> >
> 
> 
> 
> 

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