pty difficulties

[Justin Dubs]

Josiah Carlson <jcarlson at nospam.uci.edu> wrote in message news:<butccm$2un$1 at news.service.uci.edu>...
> >         while True:
> >             readable = select(connections.keys(), [], [])[0]
> >             for f in readable:
> >                 data = read(f.fileno(), 1024)
> >                 connections[f].write(data)
> >                 connections[f].flush()
> 
> I believe your problem exists in the write and flush.  All you seem to 
> be doing is checking to see if your reading file handles are capable of 
> reading, you never check to see if you can write to anything.  Your lisp 
> interpreter showcases the fact that it is not ready to get a write while 
> it is interpreting, by failing.  I believe the following should fix you up:
> 
>          while True:
>              readable = select(connections.keys(), [], [])[0]
>              for f in readable:
>                  if select([], [connections[f]], [], 0)[1]:
>                      data = read(f.fileno(), 1024)
>                      connections[f].write(data)
>                      connections[f].flush()

Thanks for the suggestions, but this didn't help.  I should have
mentioned that I had tried this before.  Here's the code I had used:

while True:
    readable, writeable, ignore = select(connections.keys(),
connections.values(), [])
    for f in readable:
        if connections[f] in writeable:
            data = read(f.fileno(), 1024)
            connections[f].write(data)
            connections[f].flush()

I don't think checking for writeable status /should/ help because the
write call I am using blocks.  So, if the stream isn't writeable, it
should just block until it is.  I think.

Justin Dubs