perl: array matching Post: 302554028

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ipc::run::debug

IPC::Run::Debug(3)					User Contributed Perl Documentation					IPC::Run::Debug(3)

NAME

       IPC::Run::Debug - debugging routines for IPC::Run

SYNOPSIS

	  ##
	  ## Environment variable usage
	  ##
	  ## To force debugging off and shave a bit of CPU and memory
	  ## by compile-time optimizing away all debugging code in IPC::Run
	  ## (debug => ...) options to IPC::Run will be ignored.
	  export IPCRUNDEBUG=none

	  ## To force debugging on (levels are from 0..10)
	  export IPCRUNDEBUG=basic

	  ## Leave unset or set to "" to compile in debugging support and
	  ## allow runtime control of it using the debug option.

DESCRIPTION

       Controls IPC::Run debugging.  Debugging levels are now set by using words, but the numbers shown are still supported for backwards
       compatibility:

	  0  none	  disabled (special, see below)
	  1  basic	  what's running
	  2  data	  what's being sent/recieved
	  3  details	  what's going on in more detail
	  4  gory	  way too much detail for most uses
	  10 all	  use this when submitting bug reports
	     noopts	  optimizations forbidden due to inherited STDIN

       The "none" level is special when the environment variable IPCRUNDEBUG is set to this the first time IPC::Run::Debug is loaded: it prevents
       the debugging code from being compiled in to the remaining IPC::Run modules, saving a bit of cpu.

       To do this in a script, here's a way that allows it to be overridden:

	  BEGIN {
	     unless ( defined $ENV{IPCRUNDEBUG} ) {
		eval 'local $ENV{IPCRUNDEBUG} = "none"; require IPC::Run::Debug"'
		   or die $@;
	     }
	  }

       This should force IPC::Run to not be debuggable unless somebody sets the IPCRUNDEBUG flag; modify this formula to grep @ARGV if need be:

	  BEGIN {
	     unless ( grep /^--debug/, @ARGV ) {
		eval 'local $ENV{IPCRUNDEBUG} = "none"; require IPC::Run::Debug"'
		or die $@;
	  }

       Both of those are untested.

AUTHOR

       Barrie Slaymaker <barries@slaysys.com>, with numerous suggestions by p5p.

perl v5.16.3							    2012-01-16							IPC::Run::Debug(3)