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Annotation of researchv10no/cmd/odist/ipcidea, revision 1.1.1.1

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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