ptyio / ptyspawn interface

 Hi,
 Forget about my last question, I finally figured out a way to do
what I wanted without openpty().

 This mail raises another question : I've studied the ptyget package
rather deeply, and I'm still confused by ptyio and ptyspawn. There is
an elaborated communication mechanism between ptyio and ptyspawn, which
adds much complexity to ptyio's code, and forces ptyspawn to handle
signals. Is all this really necessary, and if so, why ?

 The interface that comes naturally to my mind is something like :
  ptyget ptycopy program
where ptycopy just makes the connection between stdin and the
terminal's input, and between the terminal's output and stdout,
a la ioconnect.
 (http://www.skarnet.org/software/conn-tools/ioconnect.html)
 But since Dan didn't make it that simple, there's probably a
reason. What is it ?

-- 
 Ska