| /* |
| * Copyright 2021 Google, 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. |
| */ |
| |
| #pragma once |
| |
| #include <condition_variable> |
| #include <mutex> |
| #include <vector> |
| |
| class Reaper { |
| public: |
| struct target_proc { |
| int pidfd; |
| int pid; |
| uid_t uid; |
| }; |
| private: |
| // mutex_ and cond_ are used to wakeup the reaper thread. |
| std::mutex mutex_; |
| std::condition_variable cond_; |
| // mutex_ protects queue_ and active_requests_ access. |
| std::vector<struct target_proc> queue_; |
| int active_requests_; |
| // write side of the pipe to communicate kill failures with the main thread |
| int comm_fd_; |
| int thread_cnt_; |
| pthread_t* thread_pool_; |
| bool debug_enabled_; |
| |
| bool async_kill(const struct target_proc& target); |
| public: |
| Reaper() : active_requests_(0), thread_cnt_(0), debug_enabled_(false) {} |
| |
| static bool is_reaping_supported(); |
| |
| bool init(int comm_fd); |
| int thread_cnt() const { return thread_cnt_; } |
| void enable_debug(bool enable) { debug_enabled_ = enable; } |
| bool debug_enabled() const { return debug_enabled_; } |
| |
| // return 0 on success or error code returned by the syscall |
| int kill(const struct target_proc& target, bool synchronous); |
| // below members are used only by reaper_main |
| target_proc dequeue_request(); |
| void request_complete(); |
| void notify_kill_failure(int pid); |
| }; |