pty issues (when it changes)

[Shaya Potter <spotter at cs dot columbia dot edu>]

We are working on a system to be able to checkpoint and restart
basically any app (or set of) on linux (with kernel level support
helping us along).  

We are able to checkpoint/restart most apps (albiet with some bugs). 
The main issue we are having with is ptys, as for example, we can
checkpoint, but if we restart later, the previously used pty might not
be available, so we try to attach it to another pty, which we can do,
but it doesn't seem to work right (i.e. one can only execute one
application (if at a shell), then we get some sort of crash, which seems
to be because of the pty change, and we aren't sure why, but seems to be
somewhat libc related.

Is there anywhere I can read up on this, does anyone have any ideas on
why this would be?  I've been spending a lot of time reading kernel
level code related to this, and the solution doesnt seem to be there,
but maybe i missed it.

thanks,

shaya potter