Mucky Monks,

It's the darndest thing - my script uses the DBI to retrieve some data from a MYSQL database then output it into a Template::Toolkit template. Among other things, these lines are included at the top of the script to give me useful debugging info: 

use warnings;

# load modules
use CGI;
use CGI::Carp qw(fatalsToBrowser);
use DBI;
use Template;
use HTML::Entities;

# error output
BEGIN {
      use CGI::Carp qw(carpout);
      carpout(STDOUT);
}

[download]
And everything runs hunky-dory. Script runs to completion just fine, no error messages output to the browser. So I'm done developing, time to turn off the error messages, so I comment out: 
# BEGIN {
#       use CGI::Carp qw(carpout);
#       carpout(STDOUT);
# }

[download]
And it hangs. Just sits there 'til the browser times out. Comment back in, runs just fine again.

What the hey?




Forget that fear of gravity,
Get a little savagery in your life.



UPDATE: Problem Solved

Many thanks to philcrow and ikegami - using their various suggestions, the script now runs just fine with carpout commented out. Here's how I applied their info:

Via telnet, used the "Script" unix command to start script logging into a text file 

script debug.txt;

[download]
Then ran the perl script successfully by passing all the parameters needed 
REMOTE_USER=username perl myscript.pl param_1=x param_2=y param_3=z;

[download]
Stop the script logger 
exit;

[download]
This has the excellent result of outptting everything - error messages and html output - to the debug.txt file for review.

I found a few things, including a sub-routine that was present in two separate places (this script "includes" several others), and a whole whack of lines using undeclared variables in if-statements. Cleaning it all up magically made it run.

In reply to Commenting out carpout causes script to hang by punch_card_don

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.