Better error-message when bind fails.

runtime/bin/socket.cc

 // Copyright (c) 2013, 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.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "bin/socket.h"
 
 #include "bin/dartutils.h"
 #include "bin/io_buffer.h"
@@ skipping 216 matching lines @@
   intptr_t socket = Socket::CreateBindConnect(addr, sourceAddr);
   OSError error;
   if (socket >= 0) {
     Socket::SetSocketIdNativeField(Dart_GetNativeArgument(args, 0), socket);
     Dart_SetReturnValue(args, Dart_True());
   } else {
     Dart_SetReturnValue(args, DartUtils::NewDartOSError(&error));
   }
 }
 
+void FUNCTION_NAME(Socket_IsBindError)(Dart_NativeArguments args) {
+  intptr_t error_number =
+      DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));
+  bool is_bind_error = Socket::IsBindError(error_number);
+  Dart_SetReturnValue(args, is_bind_error ? Dart_True() : Dart_False());
+}
 
 void FUNCTION_NAME(Socket_CreateBindDatagram)(Dart_NativeArguments args) {
   RawAddr addr;
   SocketAddress::GetSockAddr(Dart_GetNativeArgument(args, 1), &addr);
   Dart_Handle port_arg = Dart_GetNativeArgument(args, 2);
   int64_t port = DartUtils::GetInt64ValueCheckRange(port_arg, 0, 65535);
   SocketAddress::SetAddrPort(&addr, port);
   bool reuse_addr = DartUtils::GetBooleanValue(Dart_GetNativeArgument(args, 3));
   intptr_t socket = Socket::CreateBindDatagram(addr, reuse_addr);
   if (socket >= 0) {
@@ skipping 630 matching lines @@
   if (Dart_IsError(err)) {
     Dart_PropagateError(err);
   }
   return socket;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // !defined(DART_IO_DISABLED)