C语言实现套接字操作的示例代码

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define PORT 8888

int main()
{
    int sockfd;
    struct sockaddr_in server_addr, client_addr;

    // 创建套接字
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) {
        perror("socket creation failed");
        return 1;
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);

    // 绑定套接字到服务器地址
    if (bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind failed");
        return 1;
    }

    // 监听连接
    if (listen(sockfd, 5) < 0) {
        perror("listen failed");
        return 1;
    }

    printf("Server is listening on port %d...\n", PORT);

    // 接受客户端连接
    int client_sockfd, client_addrlen;
    client_addrlen = sizeof(client_addr);

    client_sockfd = accept(sockfd, (struct sockaddr*)&client_addr, &client_addrlen);
    if (client_sockfd < 0) {
        perror("accept failed");
        return 1;
    }

    printf("Client connected!\n");

    // 向客户端发送消息
    char message[100] = "Hello, client!";
    send(client_sockfd, message, sizeof(message), 0);

    // 接收客户端消息
    char buffer[100];
    recv(client_sockfd, buffer, sizeof(buffer), 0);

    printf("Client says: %s\n", buffer);

    // 关闭套接字
    close(client_sockfd);
    close(sockfd);

    return 0;
}