Unable to write file with Apache CGI scripts

Question

I want to add some logs to my CGI scripts with Perl code like this:

open(LOG, ">/path/to/my.log") or die;
print LOG "Some content...\n";
close(LOG);

However, logs are never written to my log file, while the scripts are still correctly handling requests.

I'm not very familiar with Apache, CGI and Perl, so gurus please shine a light.

Alan Haggai Alavi · Accepted Answer · 2012-08-31 08:06:31Z

1

It is probably a permission problem. The script's runner (probably user: apache, httpd or nobody) has no permission to write to the file. However, to be sure, you need to check what $! contains. Also try checking Apache's ErrorLog file when the script is run.

I would rewrite your code as:

use CGI::Carp qw( croak );

open my $log, '>', '/path/to/my.log' or croak "Error opening file: $!";
print $log "Some content...\n";
close $log;

edited Aug 31, 2012 at 8:06

answered Aug 31, 2012 at 7:58

Alan Haggai Alavi

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1 Comment

Zhao Yi Over a year ago

You code looks good but it doesn't work either... and I can't find out any useful information from error_log. I suspect opening file has failed, but where and how to check the content of $!?

Zhao Yi · Accepted Answer · 2012-09-03 02:25:33Z

0

The problem has been solved: changes to my Perl script take effect only after restarting Apache. Not sure why it behaves like this because I am thinking Perl is an interpreted language and it can be modified on the fly...

answered Sep 3, 2012 at 2:25

Zhao Yi

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