AsyncSignalHandlerTest.cpp

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/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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());
}