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Full Discussion: How to get the return code of subroutines executed as standalone as command line in Perl ?
Top Forums Shell Programming and Scripting How to get the return code of subroutines executed as standalone as command line in Perl ? Post 302420216 by ennstate on Tuesday 11th of May 2010 03:40:28 AM
Old 05-11-2010
How to get the return code of subroutines executed as standalone as command line in Perl ?
How to do I get the return code of a subroutine in a perl module if invoke the subroutine as standalone,

I have an module say TestExit.pm and in that i have a subroutine say myTest() which is returns 12, if i were to call the subroutine from
command line like

CASE:1 ( Without an explict exit in END routine )
Code:
perl -I/tmp/ -MTestExit -e 'myTest()'
echo $?
0

The above statement doesnot give me the return value of the subroutine ( which is 12 ) I get exit code as 0


Where as if I explicity do an exit in the END routine I am able to get the return code properly

Case2: ( With an explict an exit in END )
Code:
perl -I/tmp/ -MTestExit -e 'myTest()'
echo $?
12

Is there a way to pass an argument to the module or Is there a trick to get the exit code without modifying the END routing to an explict exit,


END routine exit is commented to get to match the case 1
TestExit.pm
Code:
package TestExit;

use strict;
use warnings;

our $status;

BEGIN
{
   $status = 0;
}

require Exporter;
our @ISA = qw(Exporter);

our %EXPORT_TAGS = (
                        'basic'    => [qw( myTest
                                       )],
                   );

Exporter::export_tags('basic');

sub myTest {
   print "Called myTest routine, Setting return code as 12\n";
   $status = 12;
}

1;

END {
  print "RETURN VAL:$status \n";
  #exit $status;
}

__END__

 

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LEARN ABOUT CENTOS

ppi::statement::sub

PPI::Statement::Sub(3)					User Contributed Perl Documentation				    PPI::Statement::Sub(3)

NAME

       PPI::Statement::Sub - Subroutine declaration

INHERITANCE

	 PPI::Statement::Sub
	 isa PPI::Statement
	     isa PPI::Node
		 isa PPI::Element

DESCRIPTION

       Except for the special BEGIN, CHECK, UNITCHECK, INIT, and END subroutines (which are part of PPI::Statement::Scheduled) all subroutine
       declarations are lexed as a PPI::Statement::Sub object.

       Primarily, this means all of the various "sub foo {}" statements, but also forward declarations such as "sub foo;" or "sub foo($);". It
       does not include anonymous subroutines, as these are merely part of a normal statement.

METHODS

       "PPI::Statement::Sub" has a number of methods in addition to the standard PPI::Statement, PPI::Node and PPI::Element methods.

   name
       The "name" method returns the name of the subroutine being declared.

       In some rare cases such as a naked "sub" at the end of the file, this may return false.

   prototype
       If it has one, the "prototype" method returns the subroutine's prototype.  It is returned in the same format as "prototype" in
       PPI::Token::Prototype, cleaned and removed from its brackets.

       Returns false if the subroutine does not define a prototype

   block
       With its name and implementation shared with PPI::Statement::Scheduled, the "block" method finds and returns the actual Structure object of
       the code block for this subroutine.

       Returns false if this is a forward declaration, or otherwise does not have a code block.

   forward
       The "forward" method returns true if the subroutine declaration is a forward declaration.

       That is, it returns false if the subroutine has a code block, or true if it does not.

   reserved
       The "reserved" method provides a convenience method for checking to see if this is a special reserved subroutine. It does not check against
       any particular list of reserved sub names, but just returns true if the name is all uppercase, as defined in perlsub.

       Note that in the case of BEGIN, CHECK, UNITCHECK, INIT and END, these will be defined as PPI::Statement::Scheduled objects, not
       subroutines.

       Returns true if it is a special reserved subroutine, or false if not.

TO DO

       - Write unit tests for this package

SUPPORT

       See the support section in the main module.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2001 - 2011 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.16.3							    2011-02-26						    PPI::Statement::Sub(3)
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