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Date: Wed, 05 Nov 2008 15:03:30 +0200
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [Qemu-devel] Live migration - exec: support to be reintroduced?
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To: "Daniel P. Berrange" <berrange@redhat.com>, qemu-devel@nongnu.org

Daniel P. Berrange wrote:
> We used it to implement save-to-file, exec'ing 'dd'. I'd rather prefer
> that we had a more explicit 'migrate to a file' capability rather than
> the hack of execing dd.
>   

(qemu) acceptfd blah
receives an file descriptor from the monitor using SCM_RIGHTS and 
assigns it to the tag 'blah'
(qemu) migrate fd:blah
migrates to the fd denominated by the tag 'blah'
(qemu) closefd blah

You can use literal numbers instead of tags to refer to file descriptors 
inherited from the environment:

(qemu) migrate fd:17

-- 
error compiling committee.c: too many arguments to function