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=head1 NAME
Apache::Resource - Limit resources used by httpd children
=head1 Synopsis
  PerlModule Apache::Resource
  # set child memory limit in megabytes
  # default is 64 Meg
  PerlSetEnv PERL_RLIMIT_DATA 32:48
   
  # linux does not honor RLIMIT_DATA
  # RLIMIT_AS (address space) will work to limit the size of a process
  PerlSetEnv PERL_RLIMIT_AS 32:48
   
  # set child cpu limit in seconds
  # default is 360 seconds
  PerlSetEnv PERL_RLIMIT_CPU 120
   
  PerlChildInitHandler Apache::Resource
=head1 Description
C<Apache::Resource> uses the C<BSD::Resource> module, which uses the C
function C<setrlimit> to set limits on system resources such as memory
and cpu usage.
Any C<RLIMIT> operation available to limit on your system can be set
by defining that operation as an environment variable with a C<PERL_>
prefix.  See your system C<setrlimit> manpage for available resources
which can be limited.
The following limit values are in megabytes: C<DATA>, C<RSS>,
C<STACK>, C<FSIZE>, C<CORE>, C<MEMLOCK>; all others are treated as
their natural unit.
If the value of the variable is of the form C<S:H>, C<S> is treated as
the soft limit, and C<H> is the hard limit.  If it is just a single
number, it is used for both soft and hard limits.
=head1 Defaults
To set reasonable defaults for all RLIMITs, add this to your httpd.conf:
  PerlSetEnv PERL_RLIMIT_DEFAULTS On
  PerlModule Apache::Resource
=head1 See Also
BSD::Resource(3), setrlimit(2)
=head1 Copyright
mod_perl 2.0 and its core modules are copyrighted under
The Apache Software License, Version 2.0.
=head1 Author
Doug MacEachern
=cut