blob: f9d7c861b9f9313710789148dd2877969a7e534c [file] [log] [blame]
/*
* 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>
// 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) {
SLOGE("close(2) failed: %s", strerror(errno));
};
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;
};