#include<sys/types.h>#include<sys/socket.h>#include<stdio.h>intmain(intargc,char*argv[]){intsockfd;//定义套接口描述符if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)//建立一个socket{printf("创建套接字失败.\n");return1;}else//socket创建成功{printf("套接字的ID是:%d\n",sockfd);}return0;}