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Re: [libvirt] [RFC: PATCHv4 00/15] outgoing migration via fd: rather than exec:

On 03/11/2011 05:15 AM, Paolo Bonzini wrote:
On 03/11/2011 05:30 AM, Wen Congyang wrote:
>  Yep, makes sense.  I'm double checking whether I reliably closed the
> write end of the socket in all paths, and it may boil down to changing > the child to_always_ sendmsg even if there is no fd to send. I'm still
>  thinking about it.

Using SOCK_STREAM instead of SOCK_DGRAM to create socketpair can resolve this
problem. But I don't know why.

At least with AF_INET that would be obvious: with SOCK_STRAM exiting the child will close the connection. With a datagram socket, the parent can still wait for other messages to the same UDP port.

I have no idea whether things work the same for AF_UNIX, but apparently they do. :)

Not only does this fix the problem, the other uses of socketpair() in libvirt also use SOCKET_STREAM instead of SOCKET_DGRAM.

So I'd say this is an acceptable fix.

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