From: Francis Cianfrocca <garbagecat10@...>
Date: 2006-05-09T10:11:53+09:00
Subject: Re: Considering Ruby For a Networking Application

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One more thing, what happens if you run this program on Windows on a
network? You have an intra-process localhost connection and the kernel may
be behaving differently in this case, particularly as regards the buffer
usage that would interact with nonblocking i/o.

Thanks for correcting me on the wrapper in win32.c. I have to say, it's a
strange design choice. To me it would have made more sense to wrap both
behind a "setnonblocking" method. Also, that source file is interesting, it
looks like the Ruby folks borrowed it.

On 5/8/06, Bill Kelly <billk@cts.com> wrote:
>
>
> From: "Francis Cianfrocca" <garbagecat10@gmail.com>
> >
> > From what you said, this code doesn't do what you think it should do:
> >
> > # hmm, io/nonblock refuses to work on windows because
> > # of missing GETFL :(  Just fake it...
> > if RUBY_PLATFORM =3D~ /mswin32/
> >   class IO
> >     def nonblock=3D(nb)
> >       fcntl(Fcntl::F_SETFL, nb ? Fcntl::O_NONBLOCK : 0)
> >     end
> >   end
> > end
> >
> > That's because on Windows, this isn't the way to set sockets
> nonblocking.
> > Microsoft reinvented a lot of wheels in Windows, and this is one of 'em=
.
> Try
> > this C code instead (I'll leave it to you to turn it into Ruby):
> >
> > unsigned long one =3D 1;
> > ioctlsocket (the_socket_descriptor, FIONBIO, &one);
>
> Right, except that in win32/win32.c, ruby corrects microsoft's
> misfeatures for us, by making fcntl() on win32-ruby shunt to
> ioctlsocket behind the scenes:
>
> int
> fcntl(int fd, int cmd, ...)
> {
> //[...]
>
>     if (arg & O_NONBLOCK) {
>         ioctlArg =3D 1;
>     }
>     else {
>         ioctlArg =3D 0;
>     }
>     RUBY_CRITICAL({
>         ret =3D ioctlsocket(sock, FIONBIO, &ioctlArg);
>         if (ret =3D=3D -1) {
>             errno =3D map_errno(WSAGetLastError());
>         }
>     });
>
>
> Regards,
>
> Bill
>
>
>
>

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