DPL: check for bind result as well. (#5432)

Apparently due to different OS / kernel behaviors, there might be cases in
which bind can fail as well.

Author: ktf

Framework/Core/src/runDataProcessing.cxx

@@ -1152,15 +1152,20 @@ int runStateMachine(DataProcessorSpecs const& workflow,
       if (serverAddr) {
         free(serverAddr);
       }
+      if (driverInfo.port > 64000) {
+        throw runtime_error_f("Unable to find a free port for the driver. Last attempt returned %d", result);
+      }
       serverAddr = (sockaddr_in*)malloc(sizeof(sockaddr_in));
       uv_ip4_addr("0.0.0.0", driverInfo.port, serverAddr);
-      uv_tcp_bind(&serverHandle, (const struct sockaddr*)serverAddr, 0);
+      auto bindResult = uv_tcp_bind(&serverHandle, (const struct sockaddr*)serverAddr, 0);
+      if (bindResult != 0) {
+        driverInfo.port++;
+        continue;
+      }
       result = uv_listen((uv_stream_t*)&serverHandle, 100, ws_connect_callback);
       if (result != 0) {
         driverInfo.port++;
-      }
-      if (driverInfo.port > 64000) {
-        throw runtime_error_f("Unable to find a free port for the driver. Last attempt returned %d", result);
+        continue;
       }
     } while (result != 0);
   }