Re: Can't get exclusive file lock when safely renaming a file

[Jeffrey Straszheim]

Steven D'Aprano wrote:
I'm trying to safely rename a file without over-writing any existing 
files, and I've run into a problem with file locks. Here's a naive way of 
renaming without over-writing
By default on a Linux filesystem, flock() gives you an _advisory_ lock.  
Other processes can touch the file unless they explicitly check the lock.

Try

 man mount  (see under the -o mand)

and

 man fcntl (see under file locking)

Jeffrey Straszheim

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