Subprocess puzzle and two questions
roy at panix.com
Wed Nov 14 15:22:57 CET 2012
In article <mailman.3666.1352873042.27098.python-list at python.org>,
William Ray Wing <wrw at mac.com> wrote:
> On Nov 13, 2012, at 11:41 PM, Roy Smith <roy at panix.com> wrote:
> > In article <mailman.3664.1352867713.27098.python-list at python.org>,
> > wrw at mac.com wrote:
> >> I need to time the operation of a command-line utility (specifically
> >> nslookup) from within a python program I'm writing.
> > Ugh. Why are you doing this? Shelling out to nslookup is an incredibly
> > slow and clumsy way of doing name translation. What you really want to
> > be doing is calling getaddrinfo() directly.
> > See http://docs.python.org/2/library/socket.html#socket.getaddrinfo for
> > details.
> > --
> Because, unless I'm badly mistaken (very possible), getaddrinfo doesn't let
> me specify the server from which the name is returned. I'm really not after
> the name, what I'm REALLY after is the fact that a path exists to the name
> server I specify (and how long it takes to respond). In the "good old days" I
> would just have ping'd it, but these days more and more DNS boxes (and
> servers of all sorts) are shutting off their ping response.
> Thanks, Bill
Oh, my. You're using DNS as a replacement for ping? Fair enough. In
that case, all you really care about is that you can connect to port 53
on the server...
s = socket.socket()
t0 = time.time()
t1 = time.time()
print "it took %f seconds to connect" % (t1 - t0)
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