diff --git a/common/terminator.cc b/common/terminator.cc
new file mode 100644
index 0000000..62adafd
--- /dev/null
+++ b/common/terminator.cc
@@ -0,0 +1,56 @@
+//
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "update_engine/common/terminator.h"
+
+#include <cstdlib>
+
+namespace chromeos_update_engine {
+
+volatile sig_atomic_t Terminator::exit_status_ = 1;  // default exit status
+volatile sig_atomic_t Terminator::exit_blocked_ = 0;
+volatile sig_atomic_t Terminator::exit_requested_ = 0;
+
+void Terminator::Init() {
+  exit_blocked_ = 0;
+  exit_requested_ = 0;
+  signal(SIGTERM, HandleSignal);
+}
+
+void Terminator::Init(int exit_status) {
+  exit_status_ = exit_status;
+  Init();
+}
+
+void Terminator::Exit() {
+  exit(exit_status_);
+}
+
+void Terminator::HandleSignal(int signum) {
+  if (exit_blocked_ == 0) {
+    Exit();
+  }
+  exit_requested_ = 1;
+}
+
+ScopedTerminatorExitUnblocker::~ScopedTerminatorExitUnblocker() {
+  Terminator::set_exit_blocked(false);
+  if (Terminator::exit_requested()) {
+    Terminator::Exit();
+  }
+}
+
+}  // namespace chromeos_update_engine