Filtering through an external process

[Paul Rubin]

Scott David Daniels <Scott.Daniels at Acm.Org> writes:
> > Anyone know if there's code around to filter text through an external
> > process?  Sort of like the Emacs "filter-region" command.  For
> Check out popen2 -- its the piece you need.

No, that doesn't do the job.  If you popen2 a process and send too
much input without reading the output, the subprocess will block and
your application will hang.  That is explained in the docs.  Doing it
right is a little bit complicated.  You need threads or asynchronous
i/o.  That's the functionality that's missing.