libunwindstack/tests/TestUtils.h

/*
 * Copyright (C) 2017 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.
 */

#ifndef _LIBUNWINDSTACK_TESTS_TEST_UTILS_H
#define _LIBUNWINDSTACK_TESTS_TEST_UTILS_H

#include <signal.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>

namespace unwindstack {

class TestScopedPidReaper {
 public:
  TestScopedPidReaper(pid_t pid) : pid_(pid) {}
  ~TestScopedPidReaper() {
    kill(pid_, SIGKILL);
    waitpid(pid_, nullptr, 0);
  }

 private:
  pid_t pid_;
};

inline bool TestQuiescePid(pid_t pid) {
  siginfo_t si;
  bool ready = false;
  // Wait for up to 5 seconds.
  for (size_t i = 0; i < 5000; i++) {
    if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si) == 0) {
      ready = true;
      break;
    }
    usleep(1000);
  }
  return ready;
}

}  // namespace unwindstack

#endif  // _LIBUNWINDSTACK_TESTS_TEST_UTILS_H