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python
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# 使用poll的简单服务器
# 调用poll时,将返回一个轮询对象,可以使用方法register向这个对象注册文件描述符(可使用unregister删除文件描述符)(文件描述符指的是fopen打开文件返回的int类型的文件标号)
# 注册对象后,可调用其方法poll,这将返回一个包含(fd,event)元组的列表,fd为文件描述符,event为发生的事件(位掩码)
# 比如POLLIN事件为文件描述符中有需要读取的数据
# 可以使用这样的方式来检查事件是否发生 if event&select.POLLIN:
import socket,select
s=socket.socket()
host=socket.gethostname()
port =1234
s.bind((host,port))
fdmap={s.fileno():s}
s.listen(5)
p=select.poll()#windows的select没有poll属性
p.register(s)
while True:
events=p.poll()
for fd,event in events:
if fd in fdmap:
c,addr=s.accept()
print('got connection from',addr)
p.register(c)
fdmap[c.fileno()]=c
elif event & select.POLLIN:
data=fdmap[fd].recv(1024)
if not data:
print(fdmap[fd].getpeername(),'disconnected')
p.unregister(fd)
del fdmap
else:
print(data)
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