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Re: [Qemu-devel] [PATCH v5 2/2] net: add the support for -netdev socket,


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH v5 2/2] net: add the support for -netdev socket, listen
Date: Fri, 8 Jun 2012 16:59:08 +0100

On Fri, Jun 8, 2012 at 3:54 PM, Zhi Yong Wu <address@hidden> wrote:
> On Fri, Jun 8, 2012 at 6:31 PM, Stefan Hajnoczi <address@hidden> wrote:
>> On Thu, Jun 7, 2012 at 3:54 PM,  <address@hidden> wrote:
>>> @@ -86,7 +82,16 @@ static void net_socket_send(void *opaque)
>>>         /* end of connection */
>>>     eoc:
>>>         qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
>>> +        qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
>>
>> What happens when this is not a listen socket?  I suggest setting
>> listen_fd to -1 during creation and not calling qemu_set_fd_handler()
>> when listen_fd is -1 here.  If listen_fd is 0 then we'll register
>> net_socket_accept when standard input becomes ready!
>>
>>>         closesocket(s->fd);
>>> +
>>> +        s->fd = 0;
>>
>> -1 should be used since 0 is a valid file descriptor (standard input).
> I think that s->fd = 0 doesn't cause every issue. When it is zero,
> this fd hasn't been registered with every handler. You can see that
> "qemu_set_fd_handler(s->fd, NULL, NULL, NULL);" before "s->fd = 0".

If s->fd = 0 because we are still listening and net_socket_cleanup()
is called we will close() standard input.

Stefan



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