Throw an error if the ServerSocket host argument is invalid.

runtime/bin/socket.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_SOCKET_H_
 #define BIN_SOCKET_H_
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
 
@@ skipping 44 matching lines @@
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Socket);
 };
 
 
 class ServerSocket {
  public:
   static const intptr_t kTemporaryFailure = -2;
 
   static intptr_t Accept(intptr_t fd);
+
+  // Returns a positive integer if the call is successful. In case of failure
+  // it returns:
+  //
+  //   -1: system error (errno set)
+  //   -5: invalid bindAddress
   static intptr_t CreateBindListen(const char* bindAddress,
                                    intptr_t port,
                                    intptr_t backlog);
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServerSocket);
 };
 
 #endif  // BIN_SOCKET_H_