/* ** Copyright 2019, 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. */ #include "otapreopt_utils.h" #include #include #include #include #include #include using android::base::Join; using android::base::StringPrintf; namespace android { namespace installd { bool Exec(const std::vector& arg_vector, std::string* error_msg) { const std::string command_line = Join(arg_vector, ' '); CHECK_GE(arg_vector.size(), 1U) << command_line; // Convert the args to char pointers. const char* program = arg_vector[0].c_str(); std::vector args; for (size_t i = 0; i < arg_vector.size(); ++i) { const std::string& arg = arg_vector[i]; char* arg_str = const_cast(arg.c_str()); CHECK(arg_str != nullptr) << i; args.push_back(arg_str); } args.push_back(nullptr); // Fork and exec. pid_t pid = fork(); if (pid == 0) { // No allocation allowed between fork and exec. // Change process groups, so we don't get reaped by ProcessManager. setpgid(0, 0); execv(program, &args[0]); PLOG(ERROR) << "Failed to execv(" << command_line << ")"; // _exit to avoid atexit handlers in child. _exit(1); } else { if (pid == -1) { *error_msg = StringPrintf("Failed to execv(%s) because fork failed: %s", command_line.c_str(), strerror(errno)); return false; } // wait for subprocess to finish int status; pid_t got_pid = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0)); if (got_pid != pid) { *error_msg = StringPrintf("Failed after fork for execv(%s) because waitpid failed: " "wanted %d, got %d: %s", command_line.c_str(), pid, got_pid, strerror(errno)); return false; } if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { *error_msg = StringPrintf("Failed execv(%s) because non-0 exit status", command_line.c_str()); return false; } } return true; } } // namespace installd } // namespace android