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Killing File Control Connections.
Date: Sat, 15 Apr 89 17:00 CDT
From: email@example.com (David Gadbois)
Date: Fri, 14 Apr 89 17:04 EDT
From: barmar@Think.COM (Barry Margolin)
Date: Fri, 14 Apr 89 11:13:58 MDT
From: firstname.lastname@example.org (Stephen Nicoud)
Is there anyway to tell the Symbolics to close the file control
connection as soon as the request I've made is completed? I found the
variable FS:*DEFAULT-FILE-CONTROL-CONNECTION-LIFETIME* which is set to
30 minutes (in 60ths of a second). I did set it low (30 seconds), but
I'm concerned that if I happen to be doing a large file transfer, that a
low value might cut the connection before it was through.
The timer starts running whenever the connection becomes idle. If a
file transfer is in process, it won't time out.
You can also set this on a per-host basis, by filling in the File
Control Lifetime field in the server's namespace entry. The above
variable is only used for hosts that don't have this filled in.
I'd set the timer to somewhere between 1 and 5 minutes. Every time you
have to reestablish the control connection you're going to be asked for
a password (unless you set FS:*REMEMBER-PASSWORDS* to T, usually asking
for trouble). If you set the timeout too low you'll be asked for a
password for just about every file operation.
This is getting off the subject a bit, but: I set
FS:*REMEMBER-PASSWORDS* to t (wrapped in a LOGIN-FORMS) in my lispm-init
file, mainly because I often deal with file connections to Unix boxes
that want passwords a lot. I had assumed that the remembered password
goes away when the file connection goes away, and that if I was
concerned about leaving them around, I could always manually close the
connection or do a :Reset Network to clobber them all. Is this a safe
assumption, or are the passwords cached somewhere other than in the file
connection? I'm mainly concerned about a novice or careless user
accidentally messing up files rather than any malicious acts.
You have a correct understanding of the situation. When
FS:*REMEMBER-PASSWORDS* is non-NIL, passwords are stored as instance variables
in file-access-paths. Resetting the file connection from peek, sending the
host a :file-reset t message, doing a :Reset Network command will cause the
file access path to be forgotten, causing the password to be forgotten too.
I set FS:*REMEMBER-PASSWORDS* to T in my init file too. I don't consider it
asking for trouble.