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[libvirt] Some questions about virConnectAuthCallbackPtr

Some questions which seem to be left ambigious by the documentation
for virConnectAuthCallbackPtr:


(1) For a single open, can this be called multiple times?  I'm
thinking, some authentication methods might give the user N attempts
at typing the password, which might result in N callbacks here.

(2) The documentation says: "Returns: 0 if all interactions were
filled, or -1 upon error".  However it also says "If an interaction
cannot be filled, fill in NULL and 0".  Does that mean it's OK (not an
error, return 0) if a result field is set to NULL?


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines.  Tiny program with many
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