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91 lines
2.2 KiB
91 lines
2.2 KiB
// Copyright 2020 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "base/Compiler.h"
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#include <errno.h>
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#ifdef _MSC_VER
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#include "msvc-posix.h"
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#else
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#include <unistd.h>
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#endif
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namespace android {
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namespace base {
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// Helper class to hold an integer file descriptor, and have the 'close'
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// function called automatically on scope exit, unless the 'release'
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// method was called previously.
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class ScopedFd {
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public:
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// Default constructor will hold an invalid descriptor.
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ScopedFd() : fd_(-1) {}
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// Constructor takes ownership of |fd|.
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explicit ScopedFd(int fd) : fd_(fd) {}
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// Make it movable.
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ScopedFd(ScopedFd&& other) : fd_(other.fd_) {
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other.fd_ = -1;
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}
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ScopedFd& operator=(ScopedFd&& other) {
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swap(&other);
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return *this;
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}
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// Destructor calls close().
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~ScopedFd() { close(); }
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// Return the file descriptor value, does _not_ transfer ownership.
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int get() const { return fd_; }
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// Return the file descriptor value, transfers ownership to the caller.
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int release() {
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int fd = fd_;
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fd_ = -1;
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return fd;
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}
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// Return true iff the file descriptor is valid.
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bool valid() const { return fd_ >= 0; }
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// Close the file descriptor (and make the wrapped value invalid).
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void close() {
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if (fd_ != -1) {
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int save_errno = errno;
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::close(fd_);
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fd_ = -1;
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errno = save_errno;
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}
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}
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// Swap two ScopedFd instances.
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void swap(ScopedFd* other) {
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int fd = fd_;
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fd_ = other->fd_;
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other->fd_ = fd;
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(ScopedFd);
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int fd_;
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};
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} // namespace base
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} // namespace android
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