Linux下使用socket实现TCP服务端的示例代码

来源：佚名编辑：佚名

2024-09-13 21:30:02

在Linux系统中，使用socket编程实现TCP服务端是网络开发中的基础知识。本文将通过一个简单的示例代码，展示如何创建一个基本的TCP服务器。

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 BUFFER_SIZE 1024

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[BUFFER_SIZE] = {0};
    
    // 创建socket文件描述符
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // 设置socket选项
    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);
    
    // 绑定socket到指定端口
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    
    // 开始监听连接
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    
    printf("Server listening on port %dn", PORT);
    
    while(1) {
        // 接受新的连接
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
            perror("accept");
            exit(EXIT_FAILURE);
        }
        
        // 读取客户端消息
        int valread = read(new_socket, buffer, BUFFER_SIZE);
        printf("Received message: %sn", buffer);
        
        // 发送响应
        char *response = "Hello from server";
        send(new_socket, response, strlen(response), 0);
        printf("Response sentn");
        
        close(new_socket);
    }
    
    return 0;
}