Re: using rsockets via librspreload: poll() support?

[Andreas Bluemle <andreas.bluemle-jy6uzZffzV0b1SvskN2V4Q@public.gmane.org>]

Hi Sean,

I begin to believe that this may be a more general
problem: it seems to me that errno is not always
initialized to 0 when the librspreload wrapper for
a socket system call or the corresponding r*()
routine from rsocket.c is called.

For the poll() I have cleared the errno explicitly
before polling the socket - and it is still cleared
on return from poll(). Hence: where I used to encounter
an EOPNOTSUPP, I now see errno 0 (i.e. "Success").


Best Regards

Andreas Bluemle


On Thu, 8 Aug 2013 17:46:29 +0200
Andreas Bluemle <andreas.bluemle-jy6uzZffzV0b1SvskN2V4Q@public.gmane.org> wrote:

> Hi Sean,
> 
> I am currently testing rsockets in connection with ceph.
> I am using LD_PRELOAD and the librspreload.so to force
> the application (ceph) to use rsockets instead of regular
> tcp/ip sockets.
> 
> All this works pretty well - until the point where an
> established connection is shut down: this seems to not
> work and never finishes (unless the application is killed...).
> 
> The way ceph uses sockets is in a nonblocking mode.
> When reading from a socket, it polls the socket first
> with an event mask of POLLIN and POLLRDHUP.
> 
> On the return from the poll() I see that
>   - POLLIN and POLLHUP are set in the returned events
>     (POLLRDHUP is *not* set)
>   - errno is 95 (EOPNOTSUPP)
> 
> (The POLLHUP makes me believe that in this case the other
> end has shutdown the socket already.)
> 
> The EOPNOTSUPP confuses ceph quite a bit and prevents it
> from shutting down it's side of the socket connection properly.
> 
> 
> Question: is it possible that the POLLRDHUP causes the
> EOPNOTSUPP to be set by librspreload::poll() or
> rpoll()?
> 
> Best Regards
> 
> Andreas Bluemle
> 
> 
> 
> 



-- 
Andreas Bluemle                     mailto:Andreas.Bluemle-jy6uzZffzV0b1SvskN2V4Q@public.gmane.org
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