Solved

problem with PERL script to lock file - flock()

Posted on 2008-10-04
7
733 Views
Last Modified: 2013-12-25
Hi -
Have PERL script that has the following code to lock the file when executing as follows -

1   #!/usr/bin/perl -w
2   use Fcntl ':flock'; # import LOCK_* constants
3   my $lockfile = join("","/tmp/","$0",".lock");
4   open LOCK,">>$lockfile";
5   flock LOCK,LOCK_EX|LOCK_NB;

When the script runs I get the following error -

test_lock.pl: flock() on closed filehandle LOCK at /var/www/cgi-bin/test_lock.pl line 5.

when I print $lockfile I get the following -

/tmp//var/www/cgi-bin/test_lock.pl.lock

This code ran fine on a previous server -
Any insights really appreciated -
I am stumpped -

Richard
0
Comment
Question by:rwinnick
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
7 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 22641093
#What do you get with
open LOCK,">>$lockfile" or die "$lockfile $!";
0
 

Author Comment

by:rwinnick
ID: 22641146
browser shows -

/tmp//var/www/cgi-bin/test_lock.pl.lock No such file or directory at /var/www/cgi-bin/test_lock.pl line 4.

error_log shows -

test_lock.pl: /tmp//var/www/cgi-bin/test_lock.pl.lock No such file or directory at /var/www/cgi-bin/test_lock.pl line 4.
0
 
LVL 84

Expert Comment

by:ozo
ID: 22641161
Perhaps /tmp//var/www/cgi-bin/ is not the correct directory to use on the other server
0
Get 15 Days FREE Full-Featured Trial

Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users

 

Author Comment

by:rwinnick
ID: 22641180
how would I check this ??
0
 
LVL 84

Accepted Solution

by:
ozo earned 500 total points
ID: 22641204
#maybe you can
use File::Path;
mkpath( '/tmp//var/www/cgi-bin', {verbose => 1} );
0
 

Author Comment

by:rwinnick
ID: 22641213
sorry to be slow but just a beginner at this
where would i put the above -
thanks
0
 

Author Comment

by:rwinnick
ID: 22641307
hi ozo -
figured out where to put it :-)
seems to work ok now -
how can I 'fix' things on the server so that I don't have to use the make path thing in all my code -
we can make this another question if you think appropriate -
thanks -
R
0

Featured Post

How To Reduce Deployment Times With Pre-Baked AMIs

Even if we can't include all the files in the base image, we can sometimes include some of the larger files that we would otherwise have to download, and we can also sometimes remove the most time-consuming steps. This can help a lot with reducing deployment times.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I have been pestered over the years to produce and distribute regular data extracts, and often the request have explicitly requested the data be emailed as an Excel attachement; specifically Excel, as it appears: CSV files confuse (no Red or Green h…
Active Directory replication delay is the cause to many problems.  Here is a super easy script to force Active Directory replication to all sites with by using an elevated PowerShell command prompt, and a tool to verify your changes.
The viewer will learn how to dynamically set the form action using jQuery.
Six Sigma Control Plans

622 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question