Fix extraction of error messages on Windows from getaddrinfo.

runtime/bin/socket_win.cc

 // 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.
 
 #include "bin/builtin.h"
 #include "bin/eventhandler.h"
 #include "bin/log.h"
 #include "bin/socket.h"
 
 bool Socket::Initialize() {
@@ skipping 166 matching lines @@
   // Perform a name lookup for an IPv4 address.
   struct addrinfo hints;
   memset(&hints, 0, sizeof(hints));
   hints.ai_family = AF_INET;
   hints.ai_socktype = SOCK_STREAM;
   hints.ai_protocol = IPPROTO_TCP;
   struct addrinfo* info = NULL;
   int status = getaddrinfo(host, 0, &hints, &info);
   if (status != 0) {
     ASSERT(*os_error == NULL);
-    *os_error = new OSError(status,
-                            gai_strerror(status),
-                            OSError::kGetAddressInfo);
+    DWORD error_code = WSAGetLastError();
+    SetLastError(error_code);
+    *os_error = new OSError();
     return NULL;
   }
   // Convert the address into IPv4 dotted decimal notation.
   char* buffer = reinterpret_cast<char*>(malloc(INET_ADDRSTRLEN));
   sockaddr_in *sockaddr = reinterpret_cast<sockaddr_in *>(info->ai_addr);
 
   // Clear the port before calling WSAAddressToString as WSAAddressToString
   // includes the port in the formatted string.
   DWORD len = INET_ADDRSTRLEN;
   int err = WSAAddressToString(reinterpret_cast<LPSOCKADDR>(sockaddr),
@@ skipping 54 matching lines @@
   if (status == SOCKET_ERROR) {
     DWORD rc = WSAGetLastError();
     closesocket(s);
     SetLastError(rc);
     return -1;
   }
 
   ListenSocket* listen_socket = new ListenSocket(s);
   return reinterpret_cast<intptr_t>(listen_socket);
 }