Socket.pair is not implemented

[ojab]

require 'socket'
foo, bar = Socket.pair(:UNIX, :STREAM, 0)

leads to

NoMethodError: undefined method `pair' for Socket:Class
  method_missing at org/jruby/RubyBasicObject.java:1598
           <top> at /tmp/socket.rb:3

on jruby 9.0.0.0-SNAPSHOT (2.2.2) 2015-05-22 ac104e7 Java HotSpot(TM) 64-Bit Server VM 25.45-b02 on 1.8.0_45-b14 +jit [darwin-x86_64]

[headius]

We do have UnixSocket.pair...are there any other socket types for which Socket.pair works?

[headius]

I think we can implement this simply enough for UNIX, but the other socket types will be a bit more difficult (we don't use native calls for them and the JDK socket classes don't have "pair" capability).

[ojab]

MRI also supports pair only for UNIX sockets (other fails with Errno::EOPNOTSUPP), but it can be called not only using UNIXSocket.pair, but also using Socket.pair(:UNIX, :type, :protocol).
So there is only Socket.pair/Socket.socketpair methods missing.

[headius]

@ojab thanks for looking into that. I also noticed that BSD socketpair(2) only supports UNIX as well. So we'll implement it to just call UNIXSocket.pair and error for other types.