mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 14:46:12 -04:00
127 lines
3.4 KiB
C++
127 lines
3.4 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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#include <sys/socket.h>
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#include <unistd.h>
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#include <cerrno>
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#include <cstddef>
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#include <algorithm>
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namespace nearby {
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namespace linux {
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// This method blocks until input data is available, end of file is detected, or an exception is thrown.
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ExceptionOr<ByteArray> BluetoothInputStream::Read(std::int64_t size) {
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// Sanity: avoid negative / zero sizes
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if (size <= 0) return ExceptionOr{ByteArray(std::string())};
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std::vector<char> buffer(size);
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// fd returned from bluez assumed to be stream type always
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pollfd pfds[1];
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pfds[0].fd = fd_raw_->get();
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pfds[0].events = POLLIN;
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ssize_t rcvd = 0;
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while (rcvd < size) {
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int r = poll(pfds, 1, -1);
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if (r < 0) {
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if (errno == EINTR) {
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continue;
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}
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return Exception{Exception::kIo};
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}
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if (pfds[0].revents & POLLIN) {
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while (rcvd < size) {
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auto r = recv(fd_raw_->get(), buffer.data() + rcvd, size - rcvd, 0);
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if (r > 0) {
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rcvd += r;
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continue;
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}
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if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) {continue;}
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LOG(ERROR) << __func__
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<< ": error reading from fd: " << std::strerror(errno);
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return {Exception::kIo};
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}
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}
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}
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return ExceptionOr{ByteArray(std::string(buffer.begin(), buffer.end()))};
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}
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Exception BluetoothInputStream::Close() {
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if (!fd_raw_->isValid()) return {Exception::kSuccess};
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fd_raw_ -> reset();
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return {Exception::kSuccess};
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}
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Exception BluetoothOutputStream::Write(absl::string_view data) {
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pollfd pfds[1];
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pfds[0].fd = fd_raw_->get();
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pfds[0].events = POLLOUT;
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ssize_t sent = 0;
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while (sent < data.size()) {
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int r = poll(pfds, 1, -1);
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if (r < 0) {
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if (errno == EINTR) {
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continue;
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}
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return Exception{Exception::kIo};
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}
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if (pfds[0].revents & POLLOUT) {
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while (sent < data.size()) {
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auto r = send(fd_raw_->get(), data.data() + sent, data.size(), 0);
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if (r > 0) {
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sent += r;
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continue;
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}
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if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) {continue;}
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LOG(ERROR) << __func__
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<< ": error reading from fd: " << std::strerror(errno);
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return {Exception::kIo};
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}
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}
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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_raw_->isValid()) return {Exception::kSuccess};
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fd_raw_ -> 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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