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dc03c7b130
In posix, test0 makes inter-space ipc for testing extended ipc. This correctly fails when only the cap to ipc to pager is given to all tasks in the container. In order to overcome this problem, the tasks who fork for doing ipc to each other make a request to the pager to get capabilities to do so. Pager finds its own widened ipc capability over the container, replicates it, validates and reduces it to desired boundaries (i.e. just ipc betw. two spaces) and grants it as IMMUTABLE to requesting tasks. This protocol may be useful in implementing a client/server capability request relationship. Code builds but untested.