Connected process exclusivity

bile <>
Sat Mar 6 19:42:34 CET 2010

git fetch git:// port_owner_exclusivity

This creates a new port option, 'restricted', that may be applied when
opening ports which will not allow any process but the connected one
from sending messages using Port ! Msg, erlang:send or erlang:port_*.
I've added some tests to port_SUITE to make sure it works as expected.

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