Actually Terry is wrong here :-) Sorry Terry. The portal filesystem
is not really a filesystem. All it can do is intercept open()s and
return descriptors. It isn't like NULLFS. The portal filesystem
does not do any layering at all. open() does not return a portalfs
descriptor.
What portalfs does is connect to a unix domain socket (aka a userland
process) and then it expects a control message to sent to it with
a descriptor (like to a normal file or a TCP socket or whatever). It
then returns the descriptor directly.
-Matt
Matthew Dillon
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