1 /* 2 * Copyright (C) 2024 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 #ifndef ANDROID_DEVICE_GOOGLE_CUTTLEFISH_HOST_COMMANDS_SANDBOX_PROCESS_PIDFD_H 17 #define ANDROID_DEVICE_GOOGLE_CUTTLEFISH_HOST_COMMANDS_SANDBOX_PROCESS_PIDFD_H 18 19 #include <sys/types.h> 20 21 #include <utility> 22 #include <vector> 23 24 #include <absl/status/statusor.h> 25 #include <absl/types/span.h> 26 27 #include "host/commands/process_sandboxer/unique_fd.h" 28 29 namespace cuttlefish { 30 namespace process_sandboxer { 31 32 class PidFd { 33 public: 34 /** Returns a managed pidfd tracking a previously started process with `pid`. 35 * 36 * Only reliably refers to the process `pid` if the caller can guarantee it 37 * was not reaped while this is executing, otherwise it may refer to an 38 * unknown process. */ 39 static absl::StatusOr<PidFd> FromRunningProcess(pid_t pid); 40 41 /** Launches a subprocess and returns a pidfd tracking the newly launched 42 * process. */ 43 static absl::StatusOr<PidFd> LaunchSubprocess( 44 absl::Span<const std::string> argv, 45 std::vector<std::pair<UniqueFd, int>> fds, 46 absl::Span<const std::string> env); 47 48 int Get() const; 49 50 /** Copies file descriptors from the target process, mapping them into the 51 * current process. 52 * 53 * Keys are file descriptor numbers in the target process, values are open 54 * file descriptors in the current process. 55 */ 56 absl::StatusOr<std::vector<std::pair<UniqueFd, int>>> AllFds(); 57 absl::StatusOr<std::vector<std::string>> Argv(); 58 absl::StatusOr<std::vector<std::string>> Env(); 59 60 /** Halt the process and all its descendants. */ 61 absl::Status HaltHierarchy(); 62 /** Halt all descendants of the process. Only safe to use if the caller 63 * guarantees the process doesn't spawn or reap any children while running. */ 64 absl::Status HaltChildHierarchy(); 65 66 private: 67 PidFd(UniqueFd, pid_t); 68 absl::Status SendSignal(int signal); 69 70 UniqueFd fd_; 71 pid_t pid_; 72 }; 73 74 } // namespace process_sandboxer 75 } // namespace cuttlefish 76 #endif 77