| /* |
| * Copyright (C) 2009 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. |
| */ |
| |
| #ifndef SCOPED_FD_H_included |
| #define SCOPED_FD_H_included |
| |
| #include <unistd.h> |
| #include "JNIHelp.h" // for DISALLOW_COPY_AND_ASSIGN. |
| |
| // A smart pointer that closes the given fd on going out of scope. |
| // Use this when the fd is incidental to the purpose of your function, |
| // but needs to be cleaned up on exit. |
| class ScopedFd final { |
| public: |
| explicit ScopedFd(int fd) : fd_(fd) { |
| } |
| ScopedFd() : ScopedFd(-1) {} |
| |
| ~ScopedFd() { |
| reset(); |
| } |
| |
| ScopedFd(ScopedFd&& other) : fd_(other.release()) {} |
| ScopedFd& operator = (ScopedFd&& s) { |
| reset(s.release()); |
| return *this; |
| } |
| |
| int get() const { |
| return fd_; |
| } |
| |
| int release() __attribute__((warn_unused_result)) { |
| int localFd = fd_; |
| fd_ = -1; |
| return localFd; |
| } |
| |
| void reset(int new_fd = -1) { |
| if (fd_ != -1) { |
| // Even if close(2) fails with EINTR, the fd will have been closed. |
| // Using TEMP_FAILURE_RETRY will either lead to EBADF or closing someone else's fd. |
| // http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html |
| close(fd_); |
| } |
| fd_ = new_fd; |
| } |
| |
| private: |
| int fd_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedFd); |
| }; |
| |
| #endif // SCOPED_FD_H_included |