/* * Copyright (C) 2015 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 <string> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <android-base/logging.h> // File descriptor which is automatically closed when this object is destroyed. // Cannot be copied, since that would cause double-closes. class AutoCloseFD { public: AutoCloseFD(const char *path, int flags = O_RDONLY, int mode = 0): fd{TEMP_FAILURE_RETRY(open(path, flags | O_CLOEXEC, mode))} {} AutoCloseFD(const std::string &path, int flags = O_RDONLY, int mode = 0): AutoCloseFD(path.c_str(), flags, mode) {} ~AutoCloseFD() { if (fd != -1) { int preserve_errno = errno; if (close(fd) == -1) { PLOG(ERROR) << "close(2) failed"; }; errno = preserve_errno; } } AutoCloseFD(const AutoCloseFD&) = delete; AutoCloseFD& operator=(const AutoCloseFD&) = delete; explicit operator bool() {return fd != -1;} int get() const {return fd;} private: const int fd; };