It is not possible to use a Conn in ForkExec or Dup or Dup2 #918
Description
File is used in Dup* and ForkExec. Conn is used to create connections, either pipes, UDP connections, TCP connections, and so on. There is a disconnect between these constructs. It should be possible to substitute a Conn in many places where a File is used, e.g. in Dup or ForkExec; it currently is not. I have suggested a simple patch in 1711047, but this change is somewhat unsatisfying because the Pipe type has four fds; which one of these should be used. Also, even should 1711047 be accepted, there is a further problem, detailed in the same patch, with the use of shutdown(): even if the File for a Conn is available via Dup or ForkExec, the shutdown will blow the underlying connection away. What steps will reproduce the problem? 1.Try to user a Conn with ForkExec or Dup or Dup2 I'm not sure the rest of these questions are relevant. It's a design issue not related to any particular version of Go. What is the expected output? What do you see instead? What is your $GOOS? $GOARCH? Which revision are you using? (hg identify) Please provide any additional information below.