Monitoring applications may read event data from deleted monitor files while the file descriptor for the monitor file is still open but may not block for further event occurrences.
On returning to the tcp_usrreq function, the socket descriptor is made to point to the socket's TCP control block.
在返回到tcp_usrreq函数时，创建套接字描述符，以指向套接字的tcp控制块。
3
Experiments demonstrated that the color block co-occurrence matrix descriptor considerably improves the retrieval performance and can combine the feature of color and texture effectively.