text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * 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 <folly/io/async/AsyncSignalHandler.h>
  #include <folly/io/async/EventBase.h>
  
  #include <folly/portability/GTest.h>
  
  using namespace folly;
  
  namespace {
  class TestSignalHandler : public AsyncSignalHandler {
   public:
    using AsyncSignalHandler::AsyncSignalHandler;
  
    void signalReceived(int /* signum */) noexcept override {
      called = true;
    }
  
    bool called{false};
  };
  } // namespace
  
  TEST(AsyncSignalHandler, basic) {
    EventBase evb;
    TestSignalHandler handler{&evb};
  
    handler.registerSignalHandler(SIGUSR1);
    kill(getpid(), SIGUSR1);
  
    EXPECT_FALSE(handler.called);
    evb.loopOnce(EVLOOP_NONBLOCK);
    EXPECT_TRUE(handler.called);
  }
  
  TEST(AsyncSignalHandler, attachEventBase) {
    TestSignalHandler handler{nullptr};
    EXPECT_FALSE(handler.getEventBase());
    EventBase evb;
  
    handler.attachEventBase(&evb);
    EXPECT_EQ(&evb, handler.getEventBase());
  
    handler.registerSignalHandler(SIGUSR1);
    kill(getpid(), SIGUSR1);
    EXPECT_FALSE(handler.called);
    evb.loopOnce(EVLOOP_NONBLOCK);
    EXPECT_TRUE(handler.called);
  
    handler.unregisterSignalHandler(SIGUSR1);
    handler.detachEventBase();
    EXPECT_FALSE(handler.getEventBase());
  }
  