Linux socket 搭建TCP服务器（C语言）

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
 
#define PORT 8080
#define MAX_BUF_SIZE 1024
 
int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int addrlen = sizeof(address);
    char buffer[MAX_BUF_SIZE];
    int bytes_read;
 
    // 创建socket文件描述符
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        fprintf(stderr, "Socket creation failed\n");
        exit(EXIT_FAILURE);
    }
 
    // 定义服务器端地址
    memset(&address, 0, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_port = htons(PORT);
    address.sin_addr.s_addr = INADDR_ANY;
 
    // 绑定socket到地址
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        fprintf(stderr, "Bind failed\n");
        exit(EXIT_FAILURE);
    }
 
    // 监听socket
    if (listen(server_fd, 3) < 0) {
        fprintf(stderr, "Listen failed\n");
        exit(EXIT_FAILURE);
    }
 
    // 接受客户端连接
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
        fprintf(stderr, "Accept failed\n");
        exit(EXIT_FAILURE);
    }
 
    printf("Server established\n");
 
    // 接收客户端消息
    while ((bytes_read = recv(new_socket, buffer, MAX_BUF_SIZE, 0)) > 0) {
        buffer[bytes_read] = '\0';
        printf("Received message: %s\n", buffer);
    }
 
    if (bytes_read == 0) {
        printf("Client closed connection\n");
    } else {
        fprintf(stderr, "Recv failed\n");
    }
 
    // 关闭socket
    close(new_socket);
    close(server_fd);
    return 0;
}

这段代码创建了一个基本的TCP服务器，并展示了如何接收客户端连接、接收消息和关闭连接。它是学习网络编程和了解TCP套接字编程的一个很好的起点。