Linux 网络编程——TCP编程示例代码

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> int main(int argc, char *argv[]) { unsigned short port = 8080; // 本地端口 if(argc > 1) { port = atoi(argv[1]); } int sockfd = socket(AF_INET, SOCK_STREAM, 0); // 创建通信端点：套接字 if(sockfd < 0) { perror("socket"); exit(-1); } // 设置本地地址结构体 struct sockaddr_in my_addr; bzero(&my_addr, sizeof(my_addr)); // 清空 my_addr.sin_family = AF_INET; // ipv4 my_addr.sin_port = htons(port); // 端口 my_addr.sin_addr.s_addr = htonl(INADDR_ANY); // ip // 绑定 int err_log = bind(sockfd, (struct sockaddr*)&my_addr, sizeof(my_addr)); if( err_log != 0) { perror("binding"); close(sockfd); exit(-1); } err_log = listen(sockfd, 10); // 监听，监听套接字改为被动 if(err_log != 0) { perror("listen"); close(sockfd); exit(-1); } printf("listen client @port=%d...\n",port); while(1) { struct sockaddr_in client_addr; char cli_ip[INET_ADDRSTRLEN] = ""; socklen_t cliaddr_len = sizeof(client_addr); int connfd; // 等待连接 connfd = accept(sockfd, (struct sockaddr*)&client_addr, &cliaddr_len); if(connfd < 0) { perror("accept"); continue; } inet_ntop(AF_INET, &client_addr.sin_addr, cli_ip, INET_ADDRSTRLEN); printf("----------------------------------------------\n"); printf("client ip=%s,port=%d\n", cli_ip,ntohs(client_addr.sin_port)); char recv_buf[512] = ""; while( recv(connfd, recv_buf, sizeof(recv_buf), 0) > 0 ) // 接收数据 { printf("\nrecv data:\n"); printf("%s\n",recv_buf); } close(connfd); //关闭已连接套接字 printf("client closed!\n"); } close(sockfd); //关闭监听套接字 return 0; }