在Linux中，套接字（socket）是一种用于实现网络通信的基本构建模块

服务器端：

首先，我们需要创建一个套接字，绑定到一个IP地址和端口上，然后监听连接请求。以下是一个简单的TCP服务器示例：

#include <arpa/inet.h>#include <netinet/in.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/socket.h>#include <unistd.h>#define PORT 8080#define BUFFER_SIZE 1024int main() {int server_fd, client_fd, addr_len;struct sockaddr_in server_addr, client_addr;char buffer[BUFFER_SIZE];// 创建套接字if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {perror("socket failed");exit(EXIT_FAILURE);}// 配置服务器地址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if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {perror("bind failed");exit(EXIT_FAILURE);}// 监听连接请求if (listen(server_fd, 3) < 0) {perror("listen");exit(EXIT_FAILURE);}addr_len = sizeof(client_addr);// 接受客户端连接请求if ((client_fd = accept(server_fd, (struct sockaddr *)&client_addr, (socklen_t *)&addr_len)) < 0) {perror("accept");exit(EXIT_FAILURE);}// 接收并处理客户端数据read(client_fd, buffer, BUFFER_SIZE);printf("Received from client: %s\n", buffer);// 向客户端发送数据send(client_fd, "Hello from server!", strlen("Hello from server!"), 0);printf("Message sent to client\n");// 关闭套接字close(client_fd);close(server_fd);return 0;}

客户端：

客户端需要连接到服务器，发送数据，然后接收服务器的响应。以下是一个简单的TCP客户端示例：

#include <arpa/inet.h>#include <netinet/in.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/socket.h>#include <unistd.h>#define PORT 8080#define BUFFER_SIZE 1024#define SERVER_IP "127.0.0.1"int main() {int client_fd;struct sockaddr_in server_addr;char buffer[BUFFER_SIZE] = {0};// 创建套接字if ((client_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {perror("socket failed");exit(EXIT_FAILURE);}// 配置服务器地址server_addr.sin_family = AF_INET;server_addr.sin_port = htons(PORT);if (inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr) <= 0) {perror("inet_pton");exit(EXIT_FAILURE);}// 连接到服务器if (connect(client_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {perror("connect");exit(EXIT_FAILURE);}// 向服务器发送数据send(client_fd, "Hello from client!", strlen("Hello from client!"), 0);printf("Message sent to server\n");// 接收服务器的响应read(client_fd, buffer, BUFFER_SIZE);printf("Received from server: %s\n", buffer);// 关闭套接字close(client_fd);return 0;}

这个示例展示了如何在Linux中使用套接字实现TCP服务器和客户端之间的数据传输。你可以根据需要修改代码以满足你的需求。