请问epoll不触发hup是什么问题，请问epoll触发hup,一个简单的例子，当我te

请问epoll不触发hup是什么问题，请问epoll触发hup,一个简单的例子，当我te

一个简单的例子，当我telnet 127.0.0.1 1234后，我关掉打开telnet的那个终端窗口，为什么不会触发event & select.EPOLLHUP。求解。

import socketimport selectserver=socket.socket(socket.AF_INET,socket.SOCK_STREAM)server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)server.bind(('0.0.0.0',1234))server.listen(10)server.setblocking(0)epoll=select.epoll()epoll.register(server.fileno(),select.EPOLLIN)print 'server filno:',server.fileno()try:    connections={};requests={};responses={}    while True:        events=epoll.poll(1)        for fileno,event in events:            print 'event', event            if fileno == server.fileno():                connection,addr=server.accept()                connFd=connection.fileno()                connection.setblocking(0)                epoll.register(connFd,select.EPOLLIN)                connections[connFd]=connection            elif event & select.EPOLLIN:                requests[fileno]=connections[fileno].recv(1024).strip()                epoll.modify(fileno,select.EPOLLOUT)            elif event & select.EPOLLOUT:                connections[fileno].send(requests[fileno]+'\n')                epoll.modify(fileno,select.EPOLLIN)            elif event & select.EPOLLHUP:                print('close')                epoll.unregister(fileno)                connections[fileno].close()                del connections[fileno]finally:    pass            

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