C 服务器 代码

在C语言中，编写服务器代码通常涉及使用socket编程，以下是一个简单的示例，展示了如何使用C语言编写一个基本的TCP服务器，这个服务器会监听一个端口，等待客户端的连接请求，并在接收到客户端消息后回复一条消息。

服务器端代码示例

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define PORT 8080
#define BACKLOG 5
#define BUFFER_SIZE 1024
int main() {
    int server_fd, client_fd;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_len = sizeof(client_addr);
    char buffer[BUFFER_SIZE];
    // 创建套接字
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }
    // 设置套接字选项，允许地址重用
    int opt = 1;
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) {
        perror("Setsockopt failed");
        close(server_fd);
        exit(EXIT_FAILURE);
    }
    // 绑定套接字到指定端口
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = INADDR_ANY;
    memset(&(server_addr.sin_zero), 0, 8);
    if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("Bind failed");
        close(server_fd);
        exit(EXIT_FAILURE);
    }
    // 监听套接字
    if (listen(server_fd, BACKLOG) < 0) {
        perror("Listen failed");
        close(server_fd);
        exit(EXIT_FAILURE);
    }
    printf("Server is listening on port %d...
", PORT);
    // 接受客户端连接
    while (1) {
        if ((client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &client_len)) < 0) {
            perror("Accept failed");
            continue;
        }
        printf("Connection accepted from %s:%d
", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
        // 读取客户端发送的数据
        int bytes_received = recv(client_fd, buffer, BUFFER_SIZE, 0);
        if (bytes_received < 0) {
            perror("Receive failed");
            close(client_fd);
            continue;
        }
        buffer[bytes_received] = '