Home Original page

Sockets, DNS and timeouts

Martin von Loewis loewis at informatik.hu-berlin.de
Mon Nov 26 05:09:20 EST 2001 
"Grant Beasley" <gbeasley at tsa.ac.za> writes:

> The problem appears to be that there isn't a timeout in the DNS
> module (and sockets in general??).

If it uses TCP, there will be a timeout on the TCP connection. If it
uses UDP, it apparently doesn't timeout, although it would possible to
rewrite it to use a timeout.

> Is there an easy way to wrap something in a timeout that'll exit
> gracefully without actually having to change the code in the DNS
> module?

I don't think there is. It may be possible, but it is not easy.

Instead, I recommend you try to use the DnsAsyncRequest, passing a
"done" handler. It looks like the code hasn't been tested that much,
so you may need to dive into the details even if you take this route.

HTH,
Martin
More information about the Python-list mailing list