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126 .IX Title "IPC::Run::Debug 3"
127 .TH IPC::Run::Debug 3 "2009-07-13" "perl v5.8.7" "User Contributed Perl Documentation"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 IPC::Run::Debug \- debugging routines for IPC::Run
135 .IX Header "SYNOPSIS"
138 \& ## Environment variable usage
140 \& ## To force debugging off and shave a bit of CPU and memory
141 \& ## by compile\-time optimizing away all debugging code in IPC::Run
142 \& ## (debug => ...) options to IPC::Run will be ignored.
143 \& export IPCRUNDEBUG=none
145 \& ## To force debugging on (levels are from 0..10)
146 \& export IPCRUNDEBUG=basic
148 \& ## Leave unset or set to "" to compile in debugging support and
149 \& ## allow runtime control of it using the debug option.
152 .IX Header "DESCRIPTION"
153 Controls IPC::Run debugging. Debugging levels are now set by using words,
154 but the numbers shown are still supported for backwards compatability:
157 \& 0 none disabled (special, see below)
158 \& 1 basic what\*(Aqs running
159 \& 2 data what\*(Aqs being sent/recieved
160 \& 3 details what\*(Aqs going on in more detail
161 \& 4 gory way too much detail for most uses
162 \& 10 all use this when submitting bug reports
163 \& noopts optimizations forbidden due to inherited STDIN
166 The \f(CW\*(C`none\*(C'\fR level is special when the environment variable \s-1IPCRUNDEBUG\s0
167 is set to this the first time IPC::Run::Debug is loaded: it prevents
168 the debugging code from being compiled in to the remaining IPC::Run modules,
171 To do this in a script, here's a way that allows it to be overridden:
175 \& unless ( defined $ENV{IPCRUNDEBUG} ) {
176 \& eval \*(Aqlocal $ENV{IPCRUNDEBUG} = "none"; require IPC::Run::Debug"\*(Aq
182 This should force IPC::Run to not be debuggable unless somebody sets
183 the \s-1IPCRUNDEBUG\s0 flag; modify this formula to grep \f(CW@ARGV\fR if need be:
187 \& unless ( grep /^\-\-debug/, @ARGV ) {
188 \& eval \*(Aqlocal $ENV{IPCRUNDEBUG} = "none"; require IPC::Run::Debug"\*(Aq
193 Both of those are untested.
196 Barrie Slaymaker <barries@slaysys.com>, with numerous suggestions by p5p.