launch perldb

Start Apache in single user mode with debugging flag

        matt@vrip ~ 108> ./ad-talk/apache/bin/httpd -X -D PERLDB
        [notice] Apache::DB initialized in child 1707
        

Debugger prompt will appear when request occurs

        Loading DB routines from perl5db.pl version 1.19
        Editor support available.

        Enter h or `h h' for help, or `man perldebug' for more help.

        Apache::Status::handler(/home/matt/ad-talk/perl/lib/site_perl/5.8.0/i686-linux/Apache/Status.pm:57):
        57:	    my($r) = @_;
        DB<1> 
        

Debug just like you would ordinary perl

          DB<1> n
        Apache::Status::handler(/home/matt/ad-talk/perl/lib/site_perl/5.8.0/i686-linux/Apache/Status.pm:58):
        58:	    Apache->request($r); #for Apache::CGI
          DB<1> n
        Apache::Status::handler(/home/matt/ad-talk/perl/lib/site_perl/5.8.0/i686-linux/Apache/Status.pm:59):
        59:	    my $qs = $r->args || "";
          DB<1> n
        Apache::Status::handler(/home/matt/ad-talk/perl/lib/site_perl/5.8.0/i686-linux/Apache/Status.pm:60):
        60:	    my $sub = "status_$qs";
        [ etc etc ]
        

Notice that:

• content prints to screen as print statements are stepped through
• debugger hangs until next request, when prompt will re-appear and cycle repeats

To kill debugger:

• ^Z
• kill %1

Or if that doesn't work:

• ^Z
• fg
• q