IOError: [Errno 4] Interrupted system call

[chadrik at gmail.com]

i'm getting the same error when trying to read results from popen2
within a pyQt window.  is this a threading issue? is my pyQt window
responsible for interrupting the read?  i'm fairly new to python so
i'm struggling to figure this out. can you recommend any possible
methods of preventing this? for instance, could acquiring a thread
lock before calling popen solve the problem?

thanks,
chad