disabling the line buffer somehow

[Can Burak Cilingir]

Hi,

I'm trying to proxy all keys typed by the user to a process spawned via
popen2. Unfortunately, I figured out that I can't control really
interactive applications such as mc or aptitude.

All user input seems to be line buffered.
http://pexpect.sourceforge.net/ has some words about the situation: Q:
Why not just use a pipe (popen())?

So, I understand that I cannot write a simple python code to
transperantly proxy everything between any process and user typing from
stdin without handling the raw terminal.

Would it work if I read from the controlling tty of the python
interpreter and write to the controlling tty of spawned process byte by
byte (or /dev/stdin & /dev/stdout)

Thanks..