Here's a windows version:

use strict;
use Win32::Process::Info;

my $pihandle = Win32::Process::Info->new();
my @procinfo = $pihandle->GetProcInfo();

my $ParentPID;
my %ProcNames;

foreach my $PIDInfo (@procinfo) {
    $ProcNames{$PIDInfo->{ProcessId}} = $PIDInfo->{Name};

    if ($PIDInfo->{ProcessId} == $$) {
        $ParentPID = $PIDInfo->{ParentProcessId};
    }
}

print "Parent's name is ", $ProcNames{$ParentPID}, "\n";
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