帮我写一个TCP服务端的C语言代码

好的，这是一个简单的 TCP 服务端代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 8080
#define MAX_CLIENTS 5
#define BUFFER_SIZE 1024

int main(int argc, char *argv[]) {
    int server_socket, client_socket;
    struct sockaddr_in server_address;
    int opt = 1;
    int addrlen = sizeof(server_address);
    char buffer[BUFFER_SIZE] = {0};
    
    // 创建 socket
    if ((server_socket = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // 设置 socket 选项，使服务端可以重新绑定端口
    if (setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    
    // 填充服务端地址信息
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = INADDR_ANY;
    server_address.sin_port = htons(PORT);
    
    // 绑定 socket 到服务端地址
    if (bind(server_socket, (struct sockaddr *) &server_address, sizeof(server_address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    
    // 监听客户端连接请求
    if (listen(server_socket, MAX_CLIENTS) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    
    printf("TCP server listening on port %d\n", PORT);
    
    // 接收客户端连接请求
    if ((client_socket = accept(server_socket, (struct sockaddr *) &server_address, (socklen_t *) &addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }
    
    printf("Accepted connection from client\n");
    
    // 接收客户端发送的数据
    int valread = read(client_socket, buffer, BUFFER_SIZE);
    printf("Received message from client