Question

how to check for lock file

Asked by: matgold

I ran into a problem, when trying to move file to different folder, and script failed.
the error doesn't show why. when I try to move it manually, that's when I found out it was lock by another user.

How do I check,  if the file is lock.
I was looking at the file handle (flock), but not sure if that would do it.

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Asked On
2005-10-29 at 16:34:34ID21612806
Tags

another

,

error

,

file

,

lock

Topic

Perl Programming Language

Participating Experts
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Comments
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Answers

 

by: ozoPosted on 2005-10-29 at 17:22:07ID: 15186582

WHat operating system, and how did you try to move it?

 

by: ravenplPosted on 2005-10-30 at 01:33:22ID: 15187520

   open(F_LOCK, $fname);    #for lockeing, file has to be opened
    $ret = flock(F_LOCK, 2);    #use 2|4 for non blocking lock
    #ret is false, if file was already locked

   $ret = flock(F_LOCK, 8);    #use 8|4 for non blocking lock

if You load: "use Fcntl ’:flock’;" You can use symbolic values too
LOCK_SH, LOCK_EX,  LOCK_UN, LOCK_NB

 

by: ozoPosted on 2005-10-31 at 03:38:19ID: 15191862

But flock should not affect trying to move a file.
How did you find out it was lock by another user when you tried to move it manually,
and what was the error from the script?

 

by: matgoldPosted on 2005-11-01 at 16:42:39ID: 15205168

I try moving by cut/paste, it said file is being used by another user.
I didn't get any error from the script, because I did the following.

move("$fname", "$arch\\")  or die "can't move";

 

by: ravenplPosted on 2005-11-01 at 23:12:54ID: 15206320

In fact I'm not familiar with the function move() (You mean rename() ???)
Just note, that it will not work between separates partitions, if it's the case.

> I didn't get any error from the script, because I did the following.
You mean it failed in silence?

 

by: kanduraPosted on 2005-11-02 at 02:51:22ID: 15206970

Hi matgold,
> move("$fname", "$arch\\")  or die "can't move";

At the very least, add $! to your die() output:

    move("$fname", "$arch\\")  or die "can't move $fname to $arch: $!";

Cheers!

 

by: matgoldPosted on 2005-11-03 at 12:56:27ID: 15220356

now I can't get the file to lock, so I  can run a test.

 

by: kanduraPosted on 2005-11-03 at 13:13:28ID: 15220521

Open it in Excel or some application like that. Most microsoft apps like to keep an exclusive lock on files, just for the heck of it.

 

by: kanduraPosted on 2005-11-03 at 13:13:58ID: 15220528

If you have textpad, open the file in binary mode (hex view). That'll lock it too.

 

by: kanduraPosted on 2005-11-03 at 13:15:44ID: 15220541

argh, sorry about the run of posts...

Anyway, I'd just like to mention that windows locks are of a completely different nature than normal flock locks. Maybe there is a Win32:: module somewhere that can tell you more about who's locking your file, but I don't really know (threw it out the window last year, and haven't missed it sofar ;)

20120131-EE-VQP-002

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