Re: straight-C DNS lookup with timeout?

FROM : Philip George
DATE : Thu Jan 02 23:17:30 2003

Thanks, Chris.  That's a great idea.  I'd still rather use
non-platform-specific API's though, because this app is going to be
ported to Windows, Linux, and BeOS.  I'd like to have all the
networking backend stuff as portable as possible, so that all I have to
do is change the GUI code (and add a little WinSock code to the Windows
version).

- Philip


On Thursday, January 2, 2003, at 10:12  AM, Chris Hanson wrote:

> At 4:09 AM -0600 12/30/02, Philip George wrote:

>> I'm using gethostbyaddr() right now, but I'm open for any straight-C
>> suggestions.  I must set a quicker timeout on the lookup.  The
>> default timeout is way too long for gethostbyaddr().

>
> Can you use Carbon's OTLookupName?  OTLookupName lets you specify a
> time-out, and can even do asynchronous name lookups.
>
> The big advantage to doing this rather than rolling your own DNS
> lookup library or using someone else's is that you'll still be going
> through the operating system's name-lookup mechanism.  So *everything*
> will be found regardless of whether it's being retrieved from DNS,
> Rendezvous, NetInfo, OpenDirectory, flat files, AppleTalk, some custom
> lookup agent, etc.
>
> To get any real docs on OTLookupName and how to use it, you'll have to
> look at "Inside Macintosh: Networking with Open Transport" in the Mac
> OS 9 documentation on Apple's web site.  There's also probably some
> Mac OS 9 sample code you could look at and Carbonize to play with and
> see if it'll work for your needs on Mac OS X.
>
>  -- Chris
>  -- insert minor rant here about how much more modern
>      and flexible Open Transport is than BSD sockets
>
> --
> Chris Hanson, bDistributed.com, Inc.  |  Email: <email_removed>
> Custom Application Development        |  Phone: +1-847-372-3955
> http://bdistributed.com/              |  Fax:  +1-847-589-3738
> http://bdistributed.com/Articles/    |  Personal Email: <email_removed>
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