C++ sokect服务端

以下是一个简单的 C++ socket 服务器端程序：

#include <iostream>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <cstring>

using namespace std;

int main() {
    // 创建 socket
    int server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd == -1) {
        cout << "Failed to create socket." << endl;
        return 1;
    }

    // 绑定地址和端口
    sockaddr_in server_address{};
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = INADDR_ANY;
    server_address.sin_port = htons(8888);
    if (bind(server_fd, (sockaddr *) &server_address, sizeof(server_address)) == -1) {
        cout << "Failed to bind address and port." << endl;
        return 1;
    }

    // 监听连接请求
    if (listen(server_fd, 10) == -1) {
        cout << "Failed to listen for connections." << endl;
        return 1;
    }

    // 接受连接请求
    sockaddr_in client_address{};
    socklen_t client_address_len = sizeof(client_address);
    int client_fd = accept(server_fd, (sockaddr *) &client_address, &client_address_len);
    if (client_fd == -1) {
        cout << "Failed to accept connection." << endl;
        return 1;
    }

    // 读取数据
    char buffer[1024];
    ssize_t num_read = read(client_fd, buffer, sizeof(buffer)-1);
    if (num_read == -1) {
        cout << "Failed to read from client." << endl;
        return 1;
    }
    buffer[num_read] = '\0';
    cout << "Received message: " << buffer << endl;

    // 发送数据
    const char *response = "Hello from server!";
    ssize_t num_sent = send(client_fd, response, strlen(response), 0);
    if (num_sent == -1) {
        cout << "Failed to send response to client." << endl;
        return 1;
    }

    // 关闭连接
    close(client_fd);
    close(server_fd);

    return 0;
}

该程序创建了一个监听在本地 8888 端口的 socket 服务器，可以接受客户端的连接请求，读取客户端发送的数据，并向客户端发送回应。但是该程序还不够完整和健壮，需要根据实际需求进行修改和优化。