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/*
* Copyright (C) 2022 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 "interprocess_fifo.h"
#include <android-base/logging.h>
#include <unistd.h>
using ::android::base::ErrnoError;
using ::android::base::Error;
using ::android::base::Result;
namespace android {
namespace init {
InterprocessFifo::InterprocessFifo() noexcept : fds_({-1, -1}) {}
InterprocessFifo::InterprocessFifo(InterprocessFifo&& orig) noexcept : fds_({-1, -1}) {
std::swap(fds_, orig.fds_);
}
InterprocessFifo::~InterprocessFifo() noexcept {
Close();
}
void InterprocessFifo::CloseFd(int& fd) noexcept {
if (fd >= 0) {
close(fd);
fd = -1;
}
}
void InterprocessFifo::CloseReadFd() noexcept {
CloseFd(fds_[0]);
}
void InterprocessFifo::CloseWriteFd() noexcept {
CloseFd(fds_[1]);
}
void InterprocessFifo::Close() noexcept {
CloseReadFd();
CloseWriteFd();
}
Result<void> InterprocessFifo::Initialize() noexcept {
if (fds_[0] >= 0) {
return Error() << "already initialized";
}
if (pipe(fds_.data()) < 0) { // NOLINT(android-cloexec-pipe)
return ErrnoError() << "pipe()";
}
return {};
}
Result<uint8_t> InterprocessFifo::Read() noexcept {
uint8_t byte;
ssize_t count = read(fds_[0], &byte, 1);
if (count < 0) {
return ErrnoError() << "read()";
}
if (count == 0) {
return Error() << "read() EOF";
}
DCHECK_EQ(count, 1);
return byte;
}
Result<void> InterprocessFifo::Write(uint8_t byte) noexcept {
ssize_t written = write(fds_[1], &byte, 1);
if (written < 0) {
return ErrnoError() << "write()";
}
if (written == 0) {
return Error() << "write() EOF";
}
DCHECK_EQ(written, 1);
return {};
}
} // namespace init
} // namespace android
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