[Chicago] capturing output from subprocesses

[Jess Balint]

On 11/14/05, Noel Thomas Taylor <nttaylor at uchicago.edu> wrote:
> You'll find a copy of your latest script, 'child_process_3.py', waiting
> for you in your home directory, along with a couple of 'ticker' programs
> and a copy of "pexpect.py", which has a hack for circumventing this
> problem on Irix (assuming it's the same problem)

The os.openpty() call seems to be working fine on your installation.
Maybe it was added after the 2.2 that I have on my Solaris box? I just
checked and it's there in 2.4 (ActiveState) on Solaris. So now it
seems to work OK on your IRIX box (Python 2.3.5) and the Solaris and
Linux boxes I have tested, both with Python 2.4.

> Unfortunately, I'm not sure myself exactly what's happening, only that the
> parent will wait on the child indefinitely. It will not abort when the
> timeout value passed to the select call is exceeded, nor will it report
> back when the child terminates normally.

It's putting the fd in the exception fd set. I just added a call to
check for it. The timeout was working it just re-entered the loop
because there was no condition to break if nothing was read.

Let me know how it's working for you now.

Jess