2 * Copyright 2013 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 #include "folly/File.h"
18 #include "folly/ScopeGuard.h"
20 #include <system_error>
22 #include <glog/logging.h>
31 File::File(int fd, bool ownsFd)
36 File::File(const char* name, int flags, mode_t mode)
37 : fd_(::open(name, flags, mode))
41 throw std::system_error(errno, std::system_category(), "open() failed");
46 File::File(File&& other)
48 , ownsFd_(other.ownsFd_) {
53 File& File::operator=(File&& other) {
60 closeNoThrow(); // ignore error
63 /* static */ File File::temporary() {
64 // make a temp file with tmpfile(), dup the fd, then return it in a File.
65 FILE* tmpFile = tmpfile();
67 throw std::system_error(errno, std::system_category(), "tmpfile() failed");
69 SCOPE_EXIT { fclose(tmpFile); };
71 int fd = dup(fileno(tmpFile));
73 throw std::system_error(errno, std::system_category(), "dup() failed");
76 return File(fd, true);
79 void File::release() {
84 void File::swap(File& other) {
87 swap(ownsFd_, other.ownsFd_);
90 void swap(File& a, File& b) {
95 if (!closeNoThrow()) {
96 throw std::system_error(errno, std::system_category(), "close() failed");
100 bool File::closeNoThrow() {
101 int r = ownsFd_ ? ::close(fd_) : 0;