1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 #include <unistd.h> 32 33 #include "platform/bionic/macros.h" 34 #include "private/ErrnoRestorer.h" 35 36 class ScopedFd final { 37 public: ScopedFd(int fd)38 explicit ScopedFd(int fd) : fd_(fd) { 39 } 40 ScopedFd()41 ScopedFd() : fd_(-1) { 42 } 43 ~ScopedFd()44 ~ScopedFd() { 45 reset(-1); 46 } 47 48 void reset(int fd = -1) { 49 if (fd_ != -1) { 50 ErrnoRestorer e; 51 close(fd_); 52 } 53 fd_ = fd; 54 } 55 get()56 int get() const { 57 return fd_; 58 } 59 60 private: 61 int fd_; 62 63 BIONIC_DISALLOW_COPY_AND_ASSIGN(ScopedFd); 64 }; 65