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Annotation of researchv10no/cmd/odist/ipcidea, revision 1.1

1.1     ! root        1: We can port -lipc to non-v10 systems with unix domain sockets.
        !             2: How it works:
        !             3:        client creates a socket in the unix domain, /tmp/blurfl
        !             4:        client opens a connection to /cs/server in the unix domain
        !             5:        client writes the name /tmp/blurfl to the /cs/server connection
        !             6:        client writes a random magic cookie to the /cs/server connection
        !             7:        server writes a random magic cookie back to the client
        !             8:        client closes the /cs/server connection
        !             9:        server can stat() /tmp/blurfl to find out who the client is
        !            10:        client listens on /tmp/blurfl for the server to call
        !            11:        server open /tmp/blurfl
        !            12:        client and server exchange random magic cookies obtained earlier
        !            13:        if the cookies check out we have an authenticated connection
        !            14: At this point, we've approximately duplicated the v10 business of opening
        !            15: a pipe with conn_ld and identifying ourselves.  Since unix domain sockets
        !            16: support descriptor passing, the rest should be roughly as in v10.

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