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apache_mod_perl-108~358::mod_perl-2.0.7::docs::api::ModPerl::Util(3)tionl-2.0.7::docs::api::ModPerl::Util(3)



NAME
       ModPerl::Util - Helper mod_perl Functions

Synopsis
         use ModPerl::Util;

         # e.g. PerlResponseHandler
         $callback = ModPerl::Util::current_callback;

         # exit w/o killing the interpreter
         ModPerl::Util::exit();

         # untaint a string (do not use it! see the doc)
         ModPerl::Util::untaint($string);

         # removes a stash (.so, %INC{$stash}, etc.) as best as it can
         ModPerl::Util::unload_package($stash);

         # current perl's address (0x92ac760 or 0x0 under non-threaded perl)
         ModPerl::Util::current_perl_id();

Description
       "ModPerl::Util" provides mod_perl utilities API.

API
       "ModPerl::Util" provides the following functions and/or methods:

   "current_callback"
       Returns the currently running callback name, e.g. 'PerlResponseHandler'.

         $callback = ModPerl::Util::current_callback();

       ret: $callback ( string )
       since: 2.0.00

   "current_perl_id"
       Return the memory address of the perl interpreter

         $perl_id = ModPerl::Util::current_perl_id();

       ret: $perl_id ( string )
           Under threaded perl returns something like: 0x92ac760

           Under non-thread perl returns 0x0

       since: 2.0.00

       Mainly useful for debugging applications running under threaded-perl.

   "exit"
       Terminate the request, but not the current process (or not the current Perl interpreter with threaded
       mpms).

         ModPerl::Util::exit($status);

       opt arg1: $status ( integer )
           The exit status, which as of this writing is ignored. (it's accepted to be compatible with the
           core "exit" function.)

       ret: no return value
       since: 2.0.00

       Normally you will use the plain "exit()" in your code. You don't need to use "ModPerl::Util::exit"
       explicitly, since mod_perl overrides "exit()" by setting "CORE::GLOBAL::exit" to
       "ModPerl::Util::exit". Only if you redefine "CORE::GLOBAL::exit" once mod_perl is running, you may
       want to use this function.

       The original "exit()" is still available via "CORE::exit()".

       "ModPerl::Util::exit" is implemented as a special "die()" call, therefore if you call it inside "eval
       BLOCK" or "eval "STRING"", while an exception is being thrown, it is caught by "eval". For example:

         exit;
         print "Still running";

       will not print anything. But:

         eval {
            exit;
         }
         print "Still running";

       will print Still running. So you either need to check whether the exception is specific to "exit" and
       call "exit()" again:

         use ModPerl::Const -compile => 'EXIT';
         eval {
            exit;
         }
         exit if $@ && ref $@ eq 'APR::Error' && $@ == ModPerl::EXIT;
         print "Still running";

       or use "CORE::exit()":

         eval {
            CORE::exit;
         }
         print "Still running";

       and nothing will be printed. The problem with the latter is the current process (or a Perl
       Interpreter) will be killed; something that you really want to avoid under mod_perl.

   "unload_package"
       Unloads a stash from the current Perl interpreter in the safest way possible.

         ModPerl::Util::unload_package($stash);

       arg1: $stash ( string )
           The Perl stash to unload. e.g. "MyApache2::MyData".

       ret: no return value
       since: 2.0.00

       Unloading a Perl stash (package) is a complicated business. This function tries very hard to do the
       right thing. After calling this function, it should be safe to "use()" a new version of the module
       that loads the wiped package.

       References to stash elements (functions, variables, etc.) taken from outside the unloaded package
       will still be valid.

       This function may wipe off things loaded by other modules, if the latter have inserted things into
       the $stash it was told to unload.

       If a stash had a corresponding XS shared object (.so) loaded it will be unloaded as well.

       If the stash had a corresponding entry in %INC, it will be removed from there.

       "unload_package()" takes care to leave sub-stashes intact while deleting the requested stash. So for
       example if "CGI" and "CGI::Carp" are loaded, calling "unload_package('CGI')" won't affect
       "CGI::Carp".

   "untaint"
       Untaint the variable, by turning its tainted SV flag off (used internally).

         ModPerl::Util::untaint($tainted_var);

       arg1: $tainted_var (scalar)
       ret: no return value
           $tainted_var is untainted.

       since: 2.0.00

       Do not use this function unless you know what you are doing. To learn how to properly untaint
       variables refer to the perlsec manpage.

See Also
       mod_perl 2.0 documentation.

Copyright
       mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.

Authors
       The mod_perl development team and numerous contributors.



perl v5.16.2                            apache_mo2011-02-07~358::mod_perl-2.0.7::docs::api::ModPerl::Util(3)