I'm making a mini module for my own use, and although I'm getting it to work, I'm wondering if this is the best way to do this. What I'm try to do is load a module and have it fork and exec some code. It's very easy when the code is a separate script like: 
package MeM;
use warnings;
use strict;

use vars qw(@ISA @EXPORT_OK);
@ISA = qw(Exporter);
# inherit the import() from Exporter.pm 
@EXPORT_OK = qw(init);
# list of things to export if asked to 

my $pid = $$;

if(fork() == 0){exec '/home/zentara/perl5lib/memmonitor',$pid }

1;

[download]

That's working good, but requires the script to be a separate file. So after alot of hacking( and failures), I finally got the following to work. But is it any good? I had to use the weird perl shebang because exec wanted shell syntax. 

package MeMz;
use warnings;
use strict;

use vars qw(@ISA @EXPORT_OK);
@ISA = qw(Exporter);
# inherit the import() from Exporter.pm 
@EXPORT_OK = qw();
# list of things to export if asked to 

################################################# 
my $pid = $$;

my $perl=<<'EOP';
eval 'exec perl -S $0 "$@"' if 0;
use Tk;
my $mw = new MainWindow;
$mw->overrideredirect(1);
my $t = $mw->Label(-text=>'', -bg=>'black', -fg=>'yellow')->pack;

my $id = Tk::After->new($mw,1000,'repeat',[\&refresh,$pid]);

MainLoop;

sub refresh{
      my $pid = shift;
      my @size = split "\n", `cat /proc/$pid/status`;
      (my $vmsize) = grep {/VmSize/} @size;
      my (undef,$size) = split '   ',$vmsize;
      $t->configure(-text=>"PID: $pid ->  $size");
      if($size eq ''){Tk::exit}
}

EOP

if(fork() == 0){ exec (eval $perl )  }

1;

[download]
I'm not really a human, but I play one on earth. flash japh

In reply to fork and exec a codeblock by zentara

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.