[Twisted-Python] finger tutorial: server slow to shutdown
free.as.in.speech at gmail.com
Thu Oct 19 04:32:37 EDT 2006
I was working my way through the tutorial, running each version of the
server and testing it out with "telnet localhost 1079". When I got to
this ( http://twistedmatrix.com/projects/core/documentation/howto/tutorial/intro.html#auto11)
version of the server, I noticed that the server was not shutting down
immediately when I pressed ctrl-c. The script I'm running is a
verbatim copy of the tutorial code.
I see the following behavior:
1. If immediately after receiving a response from a "finger" query I
press ctrl-c to stop the server, the server shuts down:
a) after about 20 seconds, if there is no activity on port 1079, or
b) as soon as a connection is attempted on port 1079 (e.g. "telnet
2. If after having waited some time (e.g. 30 seconds) after the last
query I press ctrl-c to stop the server, it shuts down only after the
next connection attempt on port 1079.
3. If no connections have been made to the server, ctrl-c shuts it
For the case 1) above:
Running "netstat -tn" after having pressed ctrl-c and before the
server shuts down gives the following output:
Active Internet connections
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 0 0 127.0.0.1.1079 127.0.0.1.57791 TIME_WAIT
(nothing indicating an open connection to the queried web server)
For the case 2) above, there is no mention of port 1079 in the output
from "netstat -tn".
I've spent some time trying to understand why it doesn't shut down
immediately in cases 1 and 2, but haven't figured it out. Can anybody
shed some light on what is going on? What would I have to do to get
it to shutdown quickly?
freebsd 6.1 release
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