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DB(3) User Contributed Perl Documentation DB(3)
 

Apache::DB - Run the interactive Perl debugger under mod_perl

 <Location /perl>
  PerlFixupHandler +Apache::DB
  SetHandler perl-script
  PerlHandler +Apache::Registry
  Options +ExecCGI
 </Location>

Perl ships with a very useful interactive debugger, however, it does not run "out-of-the-box" in the Apache/mod_perl environment. Apache::DB makes a few adjustments so the two will cooperate.

init
This function initializes the Perl debugger hooks without actually starting the interactive debugger. In order to debug a certain piece of code, this function must be called before the code you wish debug is compiled. For example, if you want to insert debugging symbols into code that is compiled at server startup, but do not care to debug until request time, call this function from a PerlRequire'd file:
 #where db.pl is simply:
 # use Apache::DB ();
 # Apache::DB->init;
 PerlRequire conf/db.pl
 #where modules are loaded
 PerlRequire conf/init.pl
    
If you are using mod_perl 2.0 you will need to use the following as your db.pl:
  use APR::Pool (); 
  use Apache::DB (); 
  Apache::DB->init();
    
handler
This function will start the interactive debugger. It will invoke Apache::DB::init if needed. Example configuration:
 <Location /my-handler>
  PerlFixupHandler Apache::DB
  SetHandler perl-script
  PerlHandler My::handler
 </Location>
    

Security-enhanced Linux (SELinux) is a mandatory access control system many linux distrobutions are implementing. This new security scheme can assist you with protecting a server, but it doesn't come without its own set of issues. Debugging applications running on a box with SELinux on it takes a couple of extra steps and unfortunately the instructions that follow have only been tested on RedHat/Fedora.
1) You need to edit/create the file "local.te" and add the following:
if (httpd_tty_comm) {
allow { httpd_t } admin_tty_type:chr_file { ioctl getattr }; }
2) Reload your security policy.
3) Run the command "setsebool httpd_tty_comm true".
You should be aware as you debug applications on a system with SELinux your code may very well be correct, but the system policy is denying your actions.

-X
The server must be started with the "-X" to use Apache::DB.
filename/line info
The filename of Apache::Registry scripts is not displayed.

perldebug(1)

Originally written by Doug MacEachern
Currently maintained by Frank Wiles <frank@wiles.org>

This module is distributed under the same terms as Perl itself.
2008-04-27 perl v5.28.1

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