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Previously discussed here: https://www.redhat.com/archives/libguestfs/2019-July/msg00213.html It turns out that deferring callbacks is a PITA. (It would be a bit easier if C has closures.) However by rewriting the example we can avoid the need to use the cookie at all and make it run a bit more efficiently, so let's do that instead. Rich.

...let's do that instead. I was going to say also: The callbacks pass the command cookie back to the caller, and are thus all potentially racy. There seem to be two possibilities here: (1) Drop the cookie parameter entirely. (2) Document the possible race so that users don't use the cookie inappropritely. I think I favour option (1). Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html