On 8/22/2011 7:39 AM, Tomas Lidén wrote:
On 22 Aug, 13:26, Roy Smith<r...@panix.com> wrote:
In article
<356978ef-e9c1-48fd-bb87-849fe8e27...@p5g2000vbl.googlegroups.com>,
Tomas Lidén<to...@liden-privat.net> wrote:
In what order are the addresses returned by socket.gethostbyname_ex()?
We know that gethostbyname() is indeterministic but hope that
gethostbyname_ex() has a specified order.
Why would you hope that? Or maybe a better question is, why would you
expect that? In general, all name resolution calls return results in
arbitrary order. In some cases, results are intentionally changed on
every call (i.e. round-robin) in an attempt at load sharing.
What kind of ordering were you hoping for?
See previous posts.
Basically I was asking about the contract for this method..
The doc "Return a triple (hostname, aliaslist, ipaddrlist) where
hostname is the primary host name responding to the given ip_address,
aliaslist is a (possibly empty) list of alternative host names for the
same address, and ipaddrlist is a list of IPv4/v6 addresses for the same
interface on the same host (most likely containing only a single address)."
hoping that it is deterministic.
As far as I can see, that is not in the contract.
Our testing indicated that the interfaces are returned in a specific
order, but we want to know if this is really the case (on all
platforms).
Even if it were so now, a patch could change things.
--
Terry Jan Reedy
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