Start accepting incoming sockets earlier on Windows, to associate a at AcceptEx error to 'ServerSoc…

runtime/bin/socket_linux.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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 #include <stdio.h>  // NOLINT
 #include <stdlib.h>  // NOLINT
@@ skipping 388 matching lines @@
 
   if (NO_RETRY_EXPECTED(listen(fd, backlog > 0 ? backlog : SOMAXCONN)) != 0) {
     VOID_TEMP_FAILURE_RETRY(close(fd));
     return -1;
   }
 
   return fd;
 }
 
 
+bool ServerSocket::StartAccept(intptr_t fd) {
+  USE(fd);
+  return true;
+}
+
+
 static bool IsTemporaryAcceptError(int error) {
   // On Linux a number of protocol errors should be treated as EAGAIN.
   // These are the ones for TCP/IP.
   return (error == EAGAIN) || (error == ENETDOWN) || (error == EPROTO) ||
       (error == ENOPROTOOPT) || (error == EHOSTDOWN) || (error == ENONET) ||
       (error == EHOSTUNREACH) || (error == EOPNOTSUPP) ||
       (error == ENETUNREACH);
 }
 
 
@@ skipping 141 matching lines @@
   mreq.gr_interface = interfaceIndex;
   memmove(&mreq.gr_group, &addr->ss, SocketAddress::GetAddrLength(addr));
   return NO_RETRY_EXPECTED(
       setsockopt(fd, proto, MCAST_LEAVE_GROUP, &mreq, sizeof(mreq))) == 0;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)