Made the fix apply to all unices and added a unit test.

std/socket.d

@@ -73,14 +73,10 @@ version(Windows)
 else version(Posix)
 {
     version(linux)
-    {
         import std.c.linux.socket : AF_IPX, AF_APPLETALK, SOCK_RDM,
                IPPROTO_IGMP, IPPROTO_GGP, IPPROTO_PUP, IPPROTO_IDP,
                SD_RECEIVE, SD_SEND, SD_BOTH, MSG_NOSIGNAL, INADDR_NONE,
                TCP_KEEPIDLE, TCP_KEEPINTVL;
-
-        import core.sys.posix.sys.un : sockaddr_un;
-    }
     else version(OSX)
         import std.c.osx.socket : AF_IPX, AF_APPLETALK, SOCK_RDM,
                IPPROTO_IGMP, IPPROTO_GGP, IPPROTO_PUP, IPPROTO_IDP,
@@ -98,6 +94,7 @@ else version(Posix)
         static assert(false);
 
     import core.sys.posix.netdb;
+    import core.sys.posix.sys.un : sockaddr_un;
     private import core.sys.posix.fcntl;
     private import core.sys.posix.unistd;
     private import core.sys.posix.arpa.inet;
@@ -1914,6 +1911,40 @@ static if (is(sockaddr_un))
             return path;
         }
     }
+
+    unittest
+    {
+        import core.stdc.stdio : remove;
+
+        immutable ubyte[] data = [1, 2, 3, 4];
+        Socket[2] pair;
+
+        auto name = "unix-address-family-unittest-socket-name";
+        auto address = new UnixAddress(name);
+
+        auto listener = new Socket(AddressFamily.UNIX, SocketType.STREAM);
+        scope(exit) listener.close();
+
+        listener.bind(address);
+        scope(exit) remove(toStringz(name));
+
+        listener.listen(1);
+
+        pair[0] = new Socket(AddressFamily.UNIX, SocketType.STREAM);
+        scope(exit) listener.close();
+
+        pair[0].connect(address);
+        scope(exit) pair[0].close();
+
+        pair[1] = listener.accept();
+        scope(exit) pair[1].close();
+
+        pair[0].send(data);
+
+        auto buf = new ubyte[data.length];
+        pair[1].receive(buf);
+        assert(buf == data);
+    }
 }