?
Solved

flock() on closed filehandle ?

Posted on 2002-07-27
7
Medium Priority
?
1,512 Views
Last Modified: 2013-12-25
Hello,
I'm having trouble with a perl script. I do not understand what the error means. This is what it says in my error log:
flock() on closed filehandle GetNews::TITLEFILE at /home2/blah/public_html/cgi-bin/GetNews/GetNews.pm line 105.

here's the trouble section in the script:
sub print_title
{
  shift;
  my $site_name=shift;
  my $file_desc=shift;
  my $site_url=shift;
 
  my $title_file=$html_template_path."/title.template";
  my $title="";
  open (TITLEFILE,"<$title_file") ||die "Cannot find title template file";
  flock(TITLEFILE,2);
  while(<TITLEFILE>)
  {
    $title=$title.$_;
  }
  flock(TITLEFILE,8);
  close(TITLEFILE);
  $title =~ s/SITEURL/$site_url/g;
  $title =~ s/SITENAME/$site_name/g;
  $title =~ s/FILEDESC/$file_desc/g;
  print $title;
  flock(TITLEFILE,8); << line 105
  close(TITLEFILE);
}

Any explainations/suggestions appreciated.
0
Comment
Question by:sayhi
[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
  • 3
  • 2
  • 2
7 Comments
 
LVL 1

Author Comment

by:sayhi
ID: 7181700
side thing (i don't know if it has to do with the error), Readme file said something like "you may need to 'chmod o+rx' the two .pm files and the directory".
can anyone explain what o+rx translates to? (all i know what to with chmod is with numbers like 777, 775, 644, etc)
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 7181814
your script closes the file on line 100
0
 
LVL 5

Expert Comment

by:Peewee
ID: 7184841
sayhi,
here's an explanation of whats going in your script:

the code below basically opens a filehandle 'TITLEFILE', provides it with exclusive access, stores the contents of the file into a variable, unlocks the file and closes the file handle 'TITLEFILE'.

============
open (TITLEFILE,"<$title_file") ||die "Cannot find title template file";
 flock(TITLEFILE,2);
 while(<TITLEFILE>)
 {
   $title=$title.$_;
 }
 flock(TITLEFILE,8);
 close(TITLEFILE);
==================

the code below basically performs regular expressions on the contents of the file now stores in the variabale and prints the variable out, this is more than likely a template with html content and attempts to unlock and close the filehandle 'TITLEFILE'.  This will not be successful as 'TITLEFILE' no longer exists at this point, and therefore is unable to complete and file locking process.

===========================
$title =~ s/SITEURL/$site_url/g;
 $title =~ s/SITENAME/$site_name/g;
 $title =~ s/FILEDESC/$file_desc/g;
 print $title;
 flock(TITLEFILE,8); << line 105
 close(TITLEFILE);


solution:
the code below is redundant in your script, either take it out or check that you have not missed some other code that should be present and accompanies this code.

let me know how it goes

regards Peewee
flock(TITLEFILE,8); << line 105
 close(TITLEFILE);
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

 
LVL 1

Author Comment

by:sayhi
ID: 7186399
"...attempts to unlock and close the filehandle 'TITLEFILE'.  This will not be successful as 'TITLEFILE' no longer exists at this point, and therefore is unable to complete and file locking process."

okay, I understand that. thanks for explaining.

Though could you explain what is this error telling me?:
flock() on closed filehandle GetNews::TITLEFILE at /home2/blah/public_html/cgi-bin/GetNews/GetNews.pm line 105

Is it saying that where flock() is on line 105, there is nothing to close? or I have to do what you did, go look at the code and see what the problem is. Just wondering, since I want to understand what it means if I ever come across this error again.

"solution:
the code below is redundant in your script, either take it out or check that you have not missed some other code that should be present and accompanies this code.

let me know how it goes

regards Peewee
flock(TITLEFILE,8); << line 105
close(TITLEFILE);"

I took it out. It worked! =)
0
 
LVL 51

Expert Comment

by:ahoffmann
ID: 7186466
.. this all ends up in short words (see my very first comment :-)
0
 
LVL 5

Accepted Solution

by:
Peewee earned 200 total points
ID: 7187468
sayhi,

flock() on closed filehandle GetNews::TITLEFILE at /home2/blah/public_html/cgi-bin/GetNews/GetNews.pm line 105

what does this tell you?


'TITLEFILE' no longer exists at this point, and therefore is unable to complete and file locking process - hence the error.


your problem:
short solution take the offending code:
flock(TITLEFILE,8); << line 105
close(TITLEFILE);"

extra:
take a look at your code, and ask your yourself why you have a filehandle open when it has already benn closed, ie is this extra processing that has been deleted by mistake or is it because code was duplicated elsewhere by accident.

let me know if you need more help.

regards
Peewee
0
 
LVL 5

Expert Comment

by:Peewee
ID: 7190048
sayhi,

glad to be of help..

Peewee
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

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

In this tutorial I will show you how to provide a dynamic RTF document on your website generated with data from your database. For this tutorial you will need Microsoft Word or WordPad, WhizBase and Microsoft Access. In this tutorial I will show …
This article is meant to give a basic understanding of how to use R Sweave as a way to merge LaTeX and R code seamlessly into one presentable document.
Learn the basics of lists in Python. Lists, as their name suggests, are a means for ordering and storing values. : Lists are declared using brackets; for example: t = [1, 2, 3]: Lists may contain a mix of data types; for example: t = ['string', 1, T…
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
Suggested Courses

777 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