From: Matt <matt@...>
Date: 2007-07-16T04:30:05+09:00
Subject: Check Flock Status on File

I have a daemon that is checking files as they are uploaded by FTP and
processing them accordingly.
I noticed that occasionally the files are truncated, and have put this
down to the file currently being written by the FTP server as im
reading it.
I would like to check the lock status on the file, so I will only
process the file if it is not write-locked.
How can I check the lock status on a given filename?