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Click here to download plain text source code.

# subroutine name: cgidie_and_log
#
# 1. Displays error message
# 2. Logs error to "logs/error.log".
# 3. Exits from script immediately
# Calls stack is logged to "logs/error.log", but NOT displayed to visitors.
#
# Global variables used:
#  $last_die_calls_stack - filled by &catch_die_call_stack() subroutine
#  $admin_email - e-mail address of admin
#
# No operations should be performed after calling this subroutine
sub cgidie {
    my($my_mesg, $sys_mesg) = @_;
    print qq~Content-type: text/html

    <html>
    <head>
    <title>$my_mesg</title>
    </head>
    <body bgcolor="#FFFFFF">
    <font face="Arial,Helvetica,sans-serif" size="5"><b>SCRIPT ERROR!!!</b></font>
    <hr>
    <font face="Arial,Helvetica,sans-serif" size="3">
    <b>
    There was an error in processing your request.<br>
    Following is the error message:
    <ul>
    <li>Script Message: $my_mesg
    <li>System Message: $sys_mesg
    </ul>
    <hr>
    Please contact the <a href="mailto:$admin_email">administrator</a> of this site.
    <p>
    Thank you.
    <p>
    We sincerely apologize for the inconvenience.
    </b>
    </font>
    </body>
    </html>
    ~;
    
    # Log fatal error
    LOG("errors", "Script fatal error. Script message: $my_mesg; System message: $sys_mesg; Calls stack: $last_die_calls_stack");
    
    exit;            
}

$SIG{__DIE__} = \&DB::catch_die_call_stack;

package DB;
# If subroutine is in package DB, we can also trace passed parameters
sub    catch_die_call_stack {
    my ($error) = @_;
    # Record calls stack of last die
    my $sub_way;
    my ($p,$f,$l,$s,$h,$a,@a,$w);
    for (my $i = 1; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) {
        @a = ();
        foreach my $arg (@DB::args) {
            $_ = "$arg";
            s/'/\\'/g;
            s/([^\0]*)/'$1'/
            unless /^(?: -?[\d.]+ | \*[\w:]* )$/x;
            s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
            s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
            push(@a, $_);
        }
        $w = $w ? '@ = ' : '$ = ';
        $a = $h ? '(' . join(', ', @a) . ')' : '';
        $sub_way .= "$w$s$a from file $f line $l\n";
    }
    $main::last_die_calls_stack = $sub_way;
    # confirm die
    die $error;
};
package main;
 
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