这个例子没有考虑多客户端并发，一次只能处理一个客...

在Linux下创建一个简单的TCP服务器，我们可以使用C语言和基本的socket编程。 以下是一个简单的TCP服务器程序，它监听指定端口，接受客户端连接，然后接收客户端发来的数据并原样发回（echo server）。 步骤： 1. 创建socket 2. 绑定socket到地址和端口 3. 监听连接 4. 接受连接 5. 读写数据 6. 关闭连接 注意：这个例子没有考虑多客户端并发，一次只能处理一个客户端。 我们将编写一个回显服务器，它会在8888端口上监听。 代码示例： */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #define PORT 8888 #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}; // 1. 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，允许地址和端口重用 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; // 接受任意IP的连接 address.sin_port = htons(PORT); // 端口转换为网络字节序 // 2. 绑定socket到地址和端口 if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) { perror("bind failed"); exit(EXIT_FAILURE); } // 3. 监听连接，设置最大等待连接数为3 if (listen(server_fd, 3) < 0) { perror("listen"); exit(EXIT_FAILURE); } printf("Server is listening on port %d...\n", PORT); // 4. 接受连接 if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) { perror("accept"); exit(EXIT_FAILURE); } // 打印客户端IP地址 char client_ip[INET_ADDRSTRLEN]; inet_ntop(AF_INET, &address.sin_addr, client_ip, INET_ADDRSTRLEN); printf("Connection accepted from %s:%d\n", client_ip, ntohs(address.sin_port)); // 5. 读写数据 while (1) { memset(buffer, 0, BUFFER_SIZE); // 清空缓冲区 ssize_t bytes_read = read(new_socket, buffer, BUFFER_SIZE - 1); // 读取数据 if (bytes_read <= 0) { // 客户端断开连接或出错 perror("read error or client disconnected"); break; } printf("Received: %s", buffer); // 将收到的数据原样发回 send(new_socket, buffer, strlen(buffer), 0); printf("Echoed back: %s", buffer); } // 6. 关闭连接 close(new_socket); close(server_fd); return 0; } /* 编译：gcc server.c -o server 运行：./server 注意： - 这个服务器是单线程的，一次只能处理一个客户端连接。要处理多个客户端，可以使用多进程、多线程或I/O多路复用（如select, poll, epoll）。 - 实际应用中需要更完善的错误处理和资源管理。 测试： 可以使用telnet或nc（netcat）工具来测试这个服务器。 例如：在另一个终端执行 `nc localhost 8888`，然后输入一些文本，服务器会将文本回显。 */ [size=16.002px] [size=16.002px]在Linux下创建一个简单的TCP服务器，可以使用C语言和标准Socket API实现。以下是一个基础示例，该服务器监听指定端口，接收客户端连接，并将收到的消息原样返回（回显服务器）： [size=16.002px]代码示例：tcp_echo_server.c[size=12.573px][size=12.573px]c [td]http://my.tv.sohu.com/us/439633867/668987950.shtml

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