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000144_news@columbia.edu _Tue Jan 25 21:27:50 2000.msg
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From: Mark Sapiro <msapiro@value.net>
Subject: Re: Case Study #10: Atomic File Movement
Date: 26 Jan 2000 02:18:18 GMT
Organization: Not Very Much
Message-ID: <86llha$40u$1@news.value.net>
To: kermit.misc@columbia.edu
Frank posted a tutorial on the features in C-Kermit for "atomic"
file movement.
I won't quote it here as it is readily available at
http://www.columbia.edu/kermit/case10.html
It seems to me however, that there must still be a window, albeit
a small one during which a connection can be lost and the sender
will believe the file has been successfully sent and the receiver
will not or vice versa.
I don't know the details of the protocol well enough to know exactly
what scenario can occur, but I assume the sender sends a "file complete"
packet of some kind. Perhaps this packet gets lost when the connection
goes down. The sender may assume the file is successfully sent, but
the receiver doesn't know it.
Or perhaps the sender needs an ACK to this packet which the receiver
sends and this is the packet that is lost. Then the receiver knows
it has received the whole file, but the sender doesn't.
Am I missing something here, or is this a problem?
--
Mark Sapiro <msapiro@value.net> The highway is for gamblers,
San Francisco Bay Area, California better use your sense - B. Dylan