getpeername() on stdin?

[Roy Smith]

I want to do getpeername() on stdin.  I know I can do this by wrapping a socket object around stdin, with

s = socket.fromfd(sys.stdin.fileno(), family, type)

but that requires that I know what the family and type are.   What I want to do is discover the family and type by looking at what getpeername() and/or getsockname() return.  Can this be done with the standard library?

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Roy Smith
roy at panix.com