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/Format.h"
19 #include "folly/ScopeGuard.h"
21 #include <system_error>
23 #include <glog/logging.h>
32 File::File(int fd, bool ownsFd)
37 File::File(const char* name, int flags, mode_t mode)
38 : fd_(::open(name, flags, mode))
42 throw std::system_error(errno, std::system_category(),
43 folly::format("open(\"{}\", {:#o}, 0{:#o}) failed",
44 name, flags, mode).str());
49 File::File(File&& other)
51 , ownsFd_(other.ownsFd_) {
56 File& File::operator=(File&& other) {
63 closeNoThrow(); // ignore error
66 /* static */ File File::temporary() {
67 // make a temp file with tmpfile(), dup the fd, then return it in a File.
68 FILE* tmpFile = tmpfile();
70 throw std::system_error(errno, std::system_category(), "tmpfile() failed");
72 SCOPE_EXIT { fclose(tmpFile); };
74 int fd = dup(fileno(tmpFile));
76 throw std::system_error(errno, std::system_category(), "dup() failed");
79 return File(fd, true);
82 void File::release() {
87 void File::swap(File& other) {
90 swap(ownsFd_, other.ownsFd_);
93 void swap(File& a, File& b) {
98 if (!closeNoThrow()) {
99 throw std::system_error(errno, std::system_category(), "close() failed");
103 bool File::closeNoThrow() {
104 int r = ownsFd_ ? ::close(fd_) : 0;