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    pythonÖеÄÌõ¼þ±äÁ¿½ÏÖ®CÓïÑÔÖеÄÀ´Ëµ¸üÈÝÒ×ʹÓ㬶ÔÓÚµÚÒ»²ã´ÎµÄÌõ¼þ±äÁ¿À´Ëµ£¬¿ÉÒÔʹÓÃÀàthreading.Condition,ËüÄܹ»ÔÚ´ó¶àÊýµÄÏß³ÌϵͳÖÐÁ¼ºÃµÄ¹¤×÷£¬µ«ÊÇʹÓÃÕâÖÖÌõ¼þ±äÁ¿ÐèÒª½øÐжîÍâµÄ½âËøºÍ±ÕËø²Ù×÷¡£
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1 # portscanner.py: checks for active ports on a given machine; would be
2 # more realistic if checked several hosts at once; different threads
3 # check different ports; there is a self-imposed limit on the number of
4 # threads, and the event mechanism is used to wait if that limit is
5 # reached
6
7 # usage: python portscanner.py host maxthreads
8
9 import sys, threading, socket
10
11 class scanner(threading.Thread):
12     tlist = [] # list of all current scanner threads
13     maxthreads = int(sys.argv[2]) # max number of threads we’re allowing
14     evnt = threading.Event() # e


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