Re: [Qemu-devel] [PATCH 2/3] move vm stop/start to migrate_set_state

[Anthony Liguori]

Jamie Lokier wrote:
> If you get an error during the last write(), I wouldn't trust that to
> mean the recipient will definitely not see the data you wrote.  (Enjoy
> the double negative).  It's another variation of the handshake
> uncertainty, this time reflected in what write() should report when
> it's uncertain about a network transmission.  If it reports an error
> when it's uncertain, then you can't trust that a write() error means
> the data was not written, only that a problem was detected.
>   

I think you're stretching here.  If it really were the case that write() 
could actually result in data being sent out the wire and yet still 
returning an error, it would make all error handling in Unix 
unmanagable.  I can't believe this is possible in Linux and without an 
actual counter-example, I'm inclined to believe the same is true for 
every other OS out there.

Regards,

Anthony Liguori