63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
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/*
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* Copyright (C) 2019 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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*/
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#pragma once
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#include <sys/socket.h>
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#include <unistd.h>
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#include <string>
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#include "result.h"
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namespace android {
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namespace init {
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constexpr size_t kBufferSize = 4096;
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inline Result<std::string> ReadMessage(int socket) {
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char buffer[kBufferSize] = {};
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auto result = TEMP_FAILURE_RETRY(recv(socket, buffer, sizeof(buffer), 0));
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if (result == 0) {
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return Error();
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} else if (result < 0) {
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return ErrnoError();
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}
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return std::string(buffer, result);
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}
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template <typename T>
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Result<void> SendMessage(int socket, const T& message) {
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std::string message_string;
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if (!message.SerializeToString(&message_string)) {
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return Error() << "Unable to serialize message";
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}
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if (message_string.size() > kBufferSize) {
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return Error() << "Serialized message too long to send";
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}
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if (auto result =
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TEMP_FAILURE_RETRY(send(socket, message_string.c_str(), message_string.size(), 0));
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result != static_cast<long>(message_string.size())) {
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return ErrnoError() << "send() failed to send message contents";
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}
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return {};
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}
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} // namespace init
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} // namespace android
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