(OT) Question on flock

kprasanna_79 has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: (OT) Question on flock by Corion (Patriarch) on Oct 01, 2014 at 18:13 UTC
Whether you're using a cloned version of UNIX or the real thing, file locking does not prevent another process from modifying the file. File locks on UNIXish operating systems are advisory. See flock(2). The documentation also documents that locking over NFS does not work. On Windows, you cannot overwrite a locked file. Maybe that is what you're thinking of?	[reply]
Re^2: (OT) Question on flock by kprasanna_79 (Hermit) on Oct 02, 2014 at 06:34 UTC
Thanks corion But our code was working earlier which all of the sudden after moved to the cloned version of unix it stopped working. When we debugged the code it stops at flock function. Is there any way we can overcome this. Need expert advise here. -Prasanna.K	[reply]
Re^3: (OT) Question on flock by Corion (Patriarch) on Oct 02, 2014 at 06:52 UTC
How does your question relate to Perl? I think communicating with your OS vendor is the more appropriate approach here. This site is for and about Perl, and not about obscure "UNIX clones".	[reply]
Re^3: (OT) Question on flock by Anonymous Monk on Oct 02, 2014 at 06:43 UTC
... cloned version of unix ... Is there any way we can overcome this. Need expert advise here. Contact support :) fireup debugger/strace/...	[reply]
Re: (OT) Question on flock by Anonymous Monk on Oct 01, 2014 at 20:03 UTC
As the documentation says, flocks are merely advisory, meaning they only work when all programs that access the file cooperate and use the same locking mechanism. Also, as Corion already noted, a lot of file locking mechanisms don't work properly over a lot of different network file systems. Why do you want to lock the files - are you trying to coordinate different processes of yours, or are you actually trying to prevent others from accessing the files?	[reply]