在c中进行TCP socket编程，其中服务器在cloud9上运行，客户端在本地机器上运行。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

int main() {
    int serverSocket, clientSocket;
    struct sockaddr_in serverAddr, clientAddr;
    char buffer[1024];

    // 创建socket
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1) {
        perror("Error: socket creation failed");
        exit(1);
    }

    // 设置服务器地址
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(8080);
    serverAddr.sin_addr.s_addr = INADDR_ANY;

    // 绑定socket到服务器地址
    if (bind(serverSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == -1) {
        perror("Error: socket binding failed");
        exit(1);
    }

    // 监听连接请求
    if (listen(serverSocket, 5) == -1) {
        perror("Error: socket listening failed");
        exit(1);
    }

    printf("Server listening on port 8080...\n");

    // 接受客户端连接
    socklen_t clientAddrLen = sizeof(clientAddr);
    clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddr, &clientAddrLen);
    if (clientSocket == -1) {
        perror("Error: failed to accept client connection");
        exit(1);
    }

    printf("Client connected\n");

    // 接收客户端消息
    memset(buffer, 0, sizeof(buffer));
    if (recv(clientSocket, buffer, sizeof(buffer), 0) == -1) {
        perror("Error: failed to receive message from client");
        exit(1);
    }

    printf("Received message from client: %s\n", buffer);

    // 发送响应给客户端
    char response[] = "Hello from server";
    if (send(clientSocket, response, strlen(response), 0) == -1) {
        perror("Error: failed to send response to client");
        exit(1);
    }

    printf("Response sent to client\n");

    // 关闭连接
    close(clientSocket);
    close(serverSocket);

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

int main() {
    int clientSocket;
    struct sockaddr_in serverAddr;
    char buffer[1024];

    // 创建socket
    clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == -1) {
        perror("Error: socket creation failed");
        exit(1);
    }

    // 设置服务器地址
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(8080);
    serverAddr.sin_addr.s_addr = inet_addr("服务器IP地址");

    // 连接服务器
    if (connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == -1) {
        perror("Error: failed to connect to server");
        exit(1);
    }

    printf("Connected to server\n");

    // 发送消息给服务器
    char message[] = "Hello from client";
    if (send(clientSocket, message, strlen(message), 0) == -1) {
        perror("Error: failed to send message to server");
        exit(1);
    }

    printf("Message sent to server\n");

    // 接收服务器响应
    memset(buffer, 0, sizeof(buffer));
    if (recv(clientSocket, buffer, sizeof(buffer), 0) == -1) {
        perror("Error: failed to receive response from server");
        exit(1);
    }

    printf("Received response from server: %s\n", buffer);

    // 关闭连接
    close(clientSocket);

    return 0;
}