1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBMEMUNREACHABLE_PTRACER_THREAD_H_ 18 #define LIBMEMUNREACHABLE_PTRACER_THREAD_H_ 19 20 #include <functional> 21 #include <mutex> 22 23 #include "android-base/macros.h" 24 25 #include "Allocator.h" 26 27 namespace android { 28 29 class Stack; 30 31 // PtracerThread is similar to std::thread, except that it creates a "thread" 32 // that can ptrace the other threads. The thread is actually a separate 33 // process, with its own thread group, but shares address space and fds with 34 // the parent. 35 class PtracerThread { 36 public: 37 explicit PtracerThread(const std::function<int()>& func); 38 ~PtracerThread(); 39 bool Start(); 40 int Join(); 41 42 private: 43 void SetTracer(pid_t); 44 void ClearTracer(); 45 void Kill(); 46 DISALLOW_COPY_AND_ASSIGN(PtracerThread); 47 std::unique_ptr<Stack> stack_; 48 std::function<int()> func_; 49 std::mutex m_; 50 pid_t child_pid_; 51 }; 52 53 } // namespace android 54 55 #endif // LIBMEMUNREACHABLE_PTRACER_THREAD_H_ 56