[Python-Dev] Adding poll() system call
Guido van Rossum
Tue, 11 Jul 2000 11:09:16 -0500
> >> I'd suggest adding poll() to 2.0, and will submit a patch if given the
> >> go-ahead. But where should it go? A whole module for it seems
> >> excessive; should it go in posixmodule, or maybe select?
> I've completed a patch, SF#100852, to add os.poll() based on Sam
> Rushing's code with various modifications; I'd like a reviewer to look
> it over, after which I'll check it in.
> I'm not happy with the interface -- you pass in a list of (file
> descriptor, event mask) 2-tuples -- but it seems the only way to
> expose all of poll()'s functionality. I thought about allowing a lone
> file descriptor as well as a tuple, in which you'd assume an event
> mask of POLLIN | POLLPRI | POLLOUT (all the common events), but it
> seemed like too much magic.
I haven't read the patch in detail, but this approach seems
Somehow I don't understand why we need poll() when we have select(),
however. Select() is portable, poll() is Unix specific, but it seems
to provide the same functionality. What am I missing?
> Also, is there a C utility function to handle the "pass an integer or
> an object with a fileno() method" protocol for me? Should there be
This is a nice refactoring opportunity. The code probably exists in
many places, e.g. selectmodule.c. It should be a function in
fileobject.c, I suppose.
--Guido van Rossum (home page: http://dinsdale.python.org/~guido/)