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Colin Crossbcb4ed32016-01-14 15:35:40 -08001/*
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
Colin Crossa9939e92017-06-21 13:13:00 -070027namespace android {
28
Colin Crossbcb4ed32016-01-14 15:35:40 -080029class 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.
35class PtracerThread {
36 public:
Chih-Hung Hsieh034c4752016-07-12 13:50:44 -070037 explicit PtracerThread(const std::function<int()>& func);
Colin Crossbcb4ed32016-01-14 15:35:40 -080038 ~PtracerThread();
39 bool Start();
40 int Join();
Colin Crossa83881e2017-06-22 10:50:05 -070041
Colin Crossbcb4ed32016-01-14 15:35:40 -080042 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
Colin Crossa9939e92017-06-21 13:13:00 -070053} // namespace android
54
Colin Crossa83881e2017-06-22 10:50:05 -070055#endif // LIBMEMUNREACHABLE_PTRACER_THREAD_H_