01-28-2018
Questions about IPC
Hello and thanks in advance for any help anyone can offer to help me understand this
I'm curious about a 30.000 ft view on how IPC works in Linux between parent-child processes...I understand there's multiple types of IPC's... But I'm currently trying to figure out if parent-child process IPC communications go thru the API on the way to the kernel
For example... if the bash shell forks a ps command process... I'm assuming the ps process uses IPC to communicate the results back the the bash shell... If this is how it works I'm trying to figure out if it goes thru the API... I'm guessing it does but I can't find anything that specifically states that
Once again... thanks for any help anyone can offer me
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LEARN ABOUT CENTOS
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)