[Libguestfs] Libnbd asynchronous API with epoll

[Tage Johansson]

On 7/6/2023 7:06 PM, Nir Soffer wrote:
>
> - After calling for example aio_notify_read(3), can I know that the 
> next reading from the file descriptor would block?
>
> No, you have to call again aio_get_direction() and poll again until 
> the event happens.
>
Well, what I mean is:

After calling aio_notify_read, if aio_get_direction returns 
AIO_DIRECTION_READ or AIO_DIRECTION_BOTH, can I know that the reading on 
the file descriptor actually blocked? Or might there be cases when 
aio_notify_read returns and the next direction includes a read and there 
is still more data to read on the file descriptor?


I guess this is the case, but I must know or the client may hang 
unexpectedly.


Best regards,

Tage

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