代码语言：javascript复制
1 for (int port=begin; port <= end; port ){
2 /*定义socket*/
3 int server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
4
5 /*定义sockaddr_in 的变量*/
6 struct sockaddr_in server_sockaddr;
7 server_sockaddr.sin_family = AF_INET;
8 server_sockaddr.sin_addr.s_addr=htonl(INADDR_ANY);
9 server_sockaddr.sin_port = htons(port);
10 //server_sockaddr.sin_port = 0; /*端口范围是0～65535 1~1023为保留端口号*/
11
12 /*检查端口占用情况，列出占用端口号*/
13 if (bind (server_sockfd, (struct sockaddr *) &server_sockaddr, sizeof(
14 server_sockaddr)) == -1){
15 printf ("%dn", port);
16 alread_port_cnt ;
17 //break;
18 } else {
20 idle_port_cnt ;
21 }
22 close (server_sockfd);
23 }/*循环结束*/用bind()函数就可以，成功返回0, 占用返回-1.
