mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 14:46:12 -04:00
124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
// Copyright 2023 Google LLC
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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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// https://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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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <array>
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#include <cerrno>
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#include <cstdint>
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#include <cstring>
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#include "internal/platform/byte_array.h"
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#include "internal/platform/exception.h"
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#include "internal/platform/implementation/linux/bluetooth_classic_socket.h"
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#include "internal/platform/logging.h"
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namespace nearby {
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namespace linux {
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Exception Poller::Ready() {
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while (true) {
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auto ret = poll(fds_, 1, -1);
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if (ret < 0) {
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if (errno == EAGAIN) continue;
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LOG(ERROR) << __func__ << ": error polling socket for I/O: "
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<< std::strerror(errno);
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return {Exception::kIo};
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}
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if ((fds_[0].revents & poll_event_) != 0) {
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return {Exception::kSuccess};
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}
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if ((fds_[0].revents & POLLHUP) != 0) {
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LOG(ERROR) << __func__ << ": socket disconnected";
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return {Exception::kIo};
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}
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if ((fds_[0].revents & (POLLERR | POLLNVAL)) != 0) {
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LOG(ERROR) << __func__ << ": an error occured on the socket";
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return {Exception::kIo};
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}
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}
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}
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ExceptionOr<ByteArray> BluetoothInputStream::Read(std::int64_t size) {
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if (!fd_.isValid()) return Exception{Exception::kIo};
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auto poller = Poller::CreateInputPoller(fd_);
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std::string buffer;
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buffer.resize(size);
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char *data = buffer.data();
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size_t total_read = 0;
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while (total_read < size) {
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auto result = poller.Ready();
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if (result.Raised()) return result;
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auto bytes_read = read(fd_.get(), &data[total_read], (size - total_read));
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if (bytes_read < 0) {
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if (errno == EAGAIN || errno == EWOULDBLOCK) continue;
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LOG(ERROR) << __func__
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<< ": error reading data on bluetooth socket: "
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<< std::strerror(errno);
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return {Exception::kIo};
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}
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total_read += bytes_read;
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}
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return ExceptionOr{ByteArray(std::move(buffer))};
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}
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Exception BluetoothInputStream::Close() {
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if (!fd_.isValid()) return {Exception::kIo};
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fd_.reset();
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return {Exception::kSuccess};
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}
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Exception BluetoothOutputStream::Write(const ByteArray &data) {
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if (!fd_.isValid()) return Exception{Exception::kIo};
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auto poller = Poller::CreateOutputPoller(fd_);
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size_t total_wrote = 0;
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while (total_wrote < data.size()) {
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auto result = poller.Ready();
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if (result.Raised()) return result;
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const char *buf = data.data();
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auto wrote =
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write(fd_.get(), &buf[total_wrote], (data.size() - total_wrote));
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if (wrote < 0) {
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if (errno == EAGAIN || errno == EWOULDBLOCK) continue;
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LOG(ERROR) << __func__
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<< ": error writing data on bluetooth socket: "
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<< std::strerror(errno);
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return {Exception::kIo};
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}
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total_wrote += wrote;
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}
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return {Exception::kSuccess};
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}
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Exception BluetoothOutputStream::Close() {
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if (!fd_.isValid()) return {Exception::kIo};
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fd_.reset();
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return {Exception::kSuccess};
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}
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} // namespace linux
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} // namespace nearby
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