Re: Timeout on connect?

[Scott Klement <klemscot@xxxxxxxxxxxx>]

If you REALLY can't use non-blocking through out the app, do it like this:

       1) Set socket to non-blocking
       2) connect()
       3) select() until socket is writable (tells you that connect() is
               done) or a timeout.
       4) Set socket back to blocking.

Changing your code from blocking to non-blocking shouldn't be a big deal,
though.  Here's a quick & dirty way:

       1) Set socket to non-blocking at the start
       2) Create a recvb() (or whatever) subprocedure that uses select()
              on a non-blocking socket so that it works the same as
              recv() would on a blocking socket.
       3) Do a sendb() the same way.
       4) do a global replace of "recv(" to "recvb(" and "send("
              to "sendb("
       5) Now, with the exception of connect(), your non-blocking
              socket behaves the same was as your blocking socket did.

I should add some of these things to my tutorial.   People frequently ask
me how to make things time out.  Clearly, I didn't document that well.


On Mon, 4 Mar 2002, David Gibbs wrote:

> Folks:
>
> Does anyone know if it's possible to set a timeout on a TCP/IP connect?
>
> My research indicates that there is no easy way to do this ... I found
> http://www.developerweb.net/sock-faq/detail.php?id=36 which talks about
> setting the socket into non-blocking mode, which I really don't want to do
> at this point (it would change my applications structure more than I'm
> willing to deal with now).
>
> Thanks!
>
> david
>