Allow the debugger agent to reuse ports stuck in TIME_WAIT for listening

src/debug-agent.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 26 matching lines @@
 void DebuggerAgentMessageHandler(const uint16_t* message, int length,
                                  void *data) {
   reinterpret_cast<DebuggerAgent*>(data)->DebuggerMessage(message, length);
 }
 
 
 // Debugger agent main thread.
 void DebuggerAgent::Run() {
   const int kOneSecondInMicros = 1000000;
 
+  // Allow this socket to reuse port even if still in TIME_WAIT.
+  server_->SetReuseAddress(true);
+
   // First bind the socket to the requested port.
   bool bound = false;
   while (!bound && !terminate_) {
     bound = server_->Bind(port_);
 
     // If an error occoured wait a bit before retrying. The most common error
     // would be that the port is already in use so this avoids a busy loop and
     // make the agent take over the port when it becomes free.
     if (!bound) {
       terminate_now_->Wait(kOneSecondInMicros);
@@ skipping 290 matching lines @@
     if (received <= 0) {
       return total_received;
     }
     total_received += received;
   }
   return total_received;
 }
 
 
 } }  // namespace v8::internal