Re: [Libguestfs] Connecting to existing guests / guestfsd

Thinking about the way we deal with "sessions" between the host and the daemon in the guest over virtio-serial. The current way this works is as follows: Host Guest ---- ----- create socket start qemu start daemon open virtio device <-------------- accept(2) ... operations ... close(2) --------------> read returns 0 exit For the case where guestfsd is running free as a daemon in a guest, then we don't want it to just exit after the first connection. virtio-serial and guestfsd only allow one connection on a channel at a time (see: http://www.linux-kvm.org/page/Virtio-serial_API). So we change this to: Host Guest ---- ----- start daemon open virtio device <-----+ (blocks until | accepted on host) | <-------------- | accept(2) | | ... operations ... | | close(2) | --------------> | read returns 0 | close | partial reset of | internal state | | | +-----------------+ This is assuming my understanding of virtio-serial is correct. I've not tried it yet. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/