1IPC::Run::Debug(3)    User Contributed Perl Documentation   IPC::Run::Debug(3)
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NAME

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

9          ##
10          ## Environment variable usage
11          ##
12          ## To force debugging off and shave a bit of CPU and memory
13          ## by compile-time optimizing away all debugging code in IPC::Run
14          ## (debug => ...) options to IPC::Run will be ignored.
15          export IPCRUNDEBUG=none
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17          ## To force debugging on (levels are from 0..10)
18          export IPCRUNDEBUG=basic
19
20          ## Leave unset or set to "" to compile in debugging support and
21          ## allow runtime control of it using the debug option.
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DESCRIPTION

24       Controls IPC::Run debugging.  Debugging levels are now set by using
25       words, but the numbers shown are still supported for backwards
26       compatability:
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28          0  none         disabled (special, see below)
29          1  basic        what's running
30          2  data         what's being sent/recieved
31          3  details      what's going on in more detail
32          4  gory         way too much detail for most uses
33          10 all          use this when submitting bug reports
34             noopts       optimizations forbidden due to inherited STDIN
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36       The "none" level is special when the environment variable IPCRUNDEBUG
37       is set to this the first time IPC::Run::Debug is loaded: it prevents
38       the debugging code from being compiled in to the remaining IPC::Run
39       modules, saving a bit of cpu.
40
41       To do this in a script, here's a way that allows it to be overridden:
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43          BEGIN {
44             unless ( defined $ENV{IPCRUNDEBUG} ) {
45                eval 'local $ENV{IPCRUNDEBUG} = "none"; require IPC::Run::Debug"'
46                   or die $@;
47             }
48          }
49
50       This should force IPC::Run to not be debuggable unless somebody sets
51       the IPCRUNDEBUG flag; modify this formula to grep @ARGV if need be:
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53          BEGIN {
54             unless ( grep /^--debug/, @ARGV ) {
55                eval 'local $ENV{IPCRUNDEBUG} = "none"; require IPC::Run::Debug"'
56                or die $@;
57          }
58
59       Both of those are untested.
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AUTHOR

62       Barrie Slaymaker <barries@slaysys.com>, with numerous suggestions by
63       p5p.
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67perl v5.10.1                      2009-07-13                IPC::Run::Debug(3)
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