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000091_news@watsun.cc.columbia.edu _Tue May 25 14:22:42 1999.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Subject: Re: kermit process hangs around after terminal disconnect
Date: 25 May 1999 18:10:33 GMT
Organization: Columbia University
Message-ID: <7iep2p$cr7$1@newsmaster.cc.columbia.edu>
To: kermit.misc@watsun.cc.columbia.edu
In article <7iemha$5ea$1@nnrp1.deja.com>,
Mr. Scott <scott_davis@my-dejanews.com> wrote:
: It appears that this case isn't as cut and dry as I thought. I closed
: my telnet session on purpose (while using kermit connected remotely)
: and all processes died. I think what happens is that (for some unknown
: reason) the terminal stops responding (when connected to the remote
: site) and the standard escape keys don't come back to either a local
: kermit or UNIX prompt, so out of desperation we shut down our entire
: session. It is then when we log back in that kermit is still running.
:
I'm having trouble understanding exactly what you mean here. If you mean
your telnet session to AIX (from what?) is hung, so you shut down your
local session, then it's what I said yesterday -- AIX has no way of knowing
the connection is down, because neither side closed it, and so it leaves
the processes running.
: I'm not sure whether the shell that was it's parent still exists or
: not. I'll keep a close eye on that. I just have to wait for another
: unexpected lockup (which, thank goodness, happens infrequently).
:
: For the record, I am already using C-Kermit 7.0 Beta, on AIX 4.2.
:
Earlier versions of Kermit ran in two forks, and so under certain conditions
could leave zombies behind. C-Kermit 7.0 on most UNIX versions (including
AIX) now runs in a single process, so no more zombies left behind by Kermit.
If Kermit itself is left behind, it is either because the shell from which
it was invoked never tried to kill it (e.g. because it does not know the
connection has gone away), or because it tried and failed. The latter
might occur on certain OS's when Kermit is stuck in a system call that is
not returning, and system calls can't be interrupted. I don't know for
sure if there are any such platforms, and if so, whether AIX is one of them.
- Frank