spec/ruby/library/socket/*: more FreeBSD fixes

FreeBSD portability notes:

Loopback connections are not instantaneous (unlike Linux), so
non-blocking read-after-write MUST check for readability via
IO.select or IO#wait_readable before attempting non-blocking
recv/read operations.

IPv6 seems favored, so we'll get "::" instead of "0.0.0.0"

Some constants are different or obsolete, so that should be
self-explanatory.

There are still other failures I or somebody else needs to get
to when we have time and feel like dealing with spec DSL:

      http://rubyci.s3.amazonaws.com/freebsd11zfs/ruby-trunk/recent.html

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64239 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/socket/basicsocket/recvmsg_nonblock_spec.rb

@@ -156,6 +156,7 @@ describe 'BasicSocket#recvmsg_nonblock' do
 
           describe 'the returned Array' do
             before do
+              platform_is(:freebsd) { IO.select([@socket]) }
               @array = @socket.recvmsg_nonblock
             end
 

spec/ruby/library/socket/constants/constants_spec.rb

@@ -89,11 +89,22 @@ describe "Socket::Constants" do
 
   platform_is_not :windows do
     it 'defines SCM options' do
+      platform_is :freebsd do
+        Socket::Constants.should have_constant('SCM_CREDS')
+      end
+      platform_is_not :freebsd do
         Socket::Constants.should have_constant('SCM_CREDENTIALS')
       end
+    end
 
     it 'defines error options' do
       consts = ["EAI_ADDRFAMILY", "EAI_NODATA"]
+
+      # FreeBSD (11.1, at least) obsoletes EAI_ADDRFAMILY and EAI_NODATA
+      platform_is :freebsd do
+        consts = %w(EAI_MEMORY)
+      end
+
       consts.each do |c|
         Socket::Constants.should have_constant(c)
       end

spec/ruby/library/socket/socket/accept_nonblock_spec.rb

@@ -86,6 +86,8 @@ describe 'Socket#accept_nonblock' do
             @client = Socket.new(family, :STREAM, 0)
 
             @client.connect(addr)
+
+            platform_is(:freebsd) { IO.select([@server]) }
           end
 
           after do

spec/ruby/library/socket/socket/recvfrom_nonblock_spec.rb

@@ -36,6 +36,8 @@ describe 'Socket#recvfrom_nonblock' do
       describe 'with data available' do
         before do
           @client.write('hello')
+
+          platform_is(:freebsd) { IO.select([@server]) }
         end
 
         platform_is_not :windows do
@@ -52,6 +54,8 @@ describe 'Socket#recvfrom_nonblock' do
             5.times do
               @client.write('hello')
 
+              platform_is(:freebsd) { IO.select([@server]) }
+
               msg, _ = @server.recvfrom_nonblock(5)
 
               msg.should == 'hello'

spec/ruby/library/socket/socket/udp_server_recv_spec.rb

@@ -20,6 +20,12 @@ describe 'Socket.udp_server_recv' do
 
     @client.write('hello')
 
+    # FreeBSD sockets are not instanteous over loopback and
+    # will EAGAIN on recv.
+    platform_is :freebsd do
+      IO.select([@server])
+    end
+
     Socket.udp_server_recv([@server]) do |message, source|
       msg = message
       src = source

spec/ruby/library/socket/tcpserver/initialize_spec.rb

@@ -17,8 +17,9 @@ describe 'TCPServer#initialize' do
     end
 
     platform_is_not :windows do
-      it 'sets the hostname to 0.0.0.0' do
-        @server.local_address.ip_address.should == '0.0.0.0'
+      it 'sets the hostname to 0.0.0.0 or ::' do
+        a = @server.local_address
+        a.ip_address.should == (a.ipv6? ? '::' : '0.0.0.0')
       end
     end
 
@@ -42,8 +43,9 @@ describe 'TCPServer#initialize' do
     end
 
     platform_is_not :windows do
-      it 'sets the hostname to 0.0.0.0' do
-        @server.local_address.ip_address.should == '0.0.0.0'
+      it 'sets the hostname to 0.0.0.0 or ::' do
+        a = @server.local_address
+        a.ip_address.should == (a.ipv6? ? '::' : '0.0.0.0')
       end
     end
   end

spec/ruby/library/socket/udpsocket/recvfrom_nonblock_spec.rb

@@ -40,6 +40,8 @@ describe 'UDPSocket#recvfrom_nonblock' do
         describe 'with data available' do
           before do
             @client.write('hello')
+
+            platform_is(:freebsd) { IO.select([@server]) }
           end
 
           it 'returns an Array containing the data and an Array' do