Re: Locking *STMFs in the IFS

["Carsten Flensburg" <flensburg@xxxxxxxxxx>]

Hello James,

- I don't know of an IFS equivalent of the QSYS.LIB filesystem *EXCL lock.
There is a CHKOUT (Check Out Object) command however, that enables you to
prevent other users from actually updating the IFS objects while it is
checked out. But they can still read and copy the object. A checked out
object will remain in that state until the CHKIN command removes the check
out flag from the object.

Best regards,
Carsten Flensburg

----- Original Message ----- 
From: "James H H Lampert" <jamesl@xxxxxxxxxxx>
To: <midrange-l@xxxxxxxxxxxx>
Sent: Tuesday, August 03, 2004 11:33 PM
Subject: Locking *STMFs in the IFS


Ladies and Gentlemen:

Can anybody advise me on how to, from an OS/400-native application, get an
exclusive lock on a stream file?

For a while, I was looking at the locking functions of the "fcntl()"
UNIX-type API, but then I noticed that they (1) only produce advisory,
rather than mandatory, locks, and (2) don't persist while the file isn't
open.


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