I don't know how proc operates, or what $pingcmd is, but heres what I get 
#!/usr/bin/perl --
use strict;
use warnings;

use autodie;

Main( @ARGV );
exit( 0 );

sub Main {
    Tango();
    Tango();
    Tango();
}

sub Tango {
    my $lsof = qq!pslist $$ 2>NUL!;
    print qx!$lsof!;
    open my($fh), q!-|!, q!ping localhost!;
    print qx!$lsof!;
    close $fh; 
    print qx!$lsof!;
    print qq!#################################^^^<< HANDLES\n!;
    print qq!                                 |||\n!;
}

__END__

[download]
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   23   2960     0:00:00.218     0:00:0
+0.328
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   25   2968     0:00:00.234     0:00:0
+0.406
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   23   2968     0:00:00.234     0:00:0
+3.484
#################################^^^<< HANDLES
                                 |||
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   23   2968     0:00:00.234     0:00:0
+3.562
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   25   2968     0:00:00.234     0:00:0
+3.656
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   23   2968     0:00:00.234     0:00:0
+6.718
#################################^^^<< HANDLES
                                 |||
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   23   2968     0:00:00.234     0:00:0
+6.828
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   25   2968     0:00:00.250     0:00:0
+6.921
Process information for NAME:

Name                Pid Pri Thd  Hnd   Priv        CPU Time    Elapsed
+ Time
perl                712   8   1   23   2968     0:00:00.250     0:00:0
+9.984
#################################^^^<< HANDLES
                                 |||

[download]

In reply to Re^6: old file descriptors not being cleaned up by Anonymous Monk
in thread old file descriptors not being cleaned up by wagnerc

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.