服务器 linux socket c++ 编程代码

以下是一个简单的 Linux Socket 编程的 C++ 代码示例：

#include <iostream>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <thread>

#define PORT 8080

void handle_client(int socket_fd) {
    char buffer[1024] = {0};
    int valread = read(socket_fd, buffer, 1024);
    std::cout << "Received message: " << buffer << std::endl;
    send(socket_fd, "Server received your message!", strlen("Server received your message!"), 0);
    close(socket_fd);
}

int main(int argc, char const *argv[]) {
    int server_fd;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    
    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    
    // Binding socket to the specified address and port
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // Listening for incoming connections
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    std::cout << "Server is running on port " << PORT << std::endl;

    while (true) {
        // Accepting incoming connections
        int socket_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
        if (socket_fd < 0) {
            perror("accept");
            exit(EXIT_FAILURE);
        }

        std::thread t(handle_client, socket_fd);
        t.detach();
    }

    return 0;
}

以上代码创建了一个简单的服务器，它监听 8080 端口，并在收到客户端的连接请求后处理客户端发送的消息，并向客户端发送回复消息。可以通过编译并运行该代码，然后使用 telnet 或其他客户端工具连接到该服务器进行测试。