Re: [Qemu-devel] [PATCH 3/6] qtest: add C version of test infrastructure

[Paolo Bonzini]

On 01/17/2012 12:33 PM, Stefan Hajnoczi wrote:
> I was wondering about a qemu-side solution where a closed qtest socket
> means we need to shut down, but am not sure if the chardev code lets
> us do that.  (Really we want POLLHUP but we only seem to have
> POLLIN/POLLOUT handlers.)

For poll, both POLLIN and POLLOUT are always reported together with 
POLLHUP.  I think the same happens with select().  If you get a 
zero-read in the qtest chardev handler you can shut down.

Paolo