python实现的一个简单的udp server

import socket, time, sys, os
s = socket.fromfd(sys.stdin.fileno(), socket.AF_INET, socket.SOCK_DGRAM)
message, address = s.recvfrom(8192)
localaddr = s.getsockname()
s.close()
pid = os.fork()
if pid:
    sys.exit(0)
s2 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s2.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s2.bind(localaddr)
s2.connect(address)
for i in range(10):
    s2.send("Reply %d: %s" % (i + 1, message))#, address)
    time.sleep(2)
s2.send("OK, I'm done sending replies.\n")