Commits on Feb 25, 2016

1. Tcpv{4,6}_socket: transform EPIPE into Eof …

   The V1.mli describes the result of `FLOW.write`:
   
   > The result [`Ok ()] indicates success, [`Eof] indicates
   > that the connection is now closed and [`Error]
   > indicates some other error.
   
   In Unix if a peer closes its socket then `write` will fail with
   `Unix_error(Unix.EPIPE, _, _)`, not a return value of 0 (unlike
   `read`). Before this patch if a peer closes its connection then
   the failure bubbles up to the consumer of the `FLOW` interface
   who knows nothing about Unix and will typically fail outright
   with an error like:
   
   ```
   Fatal error: exception Unix.Unix_error(Unix.EPIPE, "write", "")
   Raised by primitive operation at file "src/unix/lwt_bytes.ml", line 144, characters 43-86
   Called from file "src/unix/lwt_unix.ml", line 549, characters 17-28
   ```
   
   After this patch the consumer of the `FLOW` interface will
   receive an `Eof` indicating that the connection is now closed.
   
   Signed-off-by: David Scott <dave.scott@docker.com>

   

   djs55 committed Feb 25, 2016
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