/usr/include/android/nativehelper/ScopedFd.h is in android-libnativehelper-dev 7.0.0+r33-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | /*
* 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
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