Another option is Glib. Here is a simple example using the Glib eventloop, your telnet filehandle could be watched by an add_watch callback.

You could also use threads and threads:shared to avoid the forks and pipes.

#!/usr/bin/perl
use warnings;
use strict;
use Glib;

my $main_loop = Glib::MainLoop->new;

my @input = ('a'..'z');

my $count = 1;

my $timer  = Glib::Timeout->add (1000, \&timer_callback, undef, 1 );


sub timer_callback{
     $count++;
     print "$count\n";
    return 1;
}


my $timer1  = Glib::Timeout->add (100, \&timer1_callback, undef, 1 );

sub timer1_callback{
     push (@input,shift(@input)); # circular list
     print "\t", $input[0], "\n";
     return 1;
}

Glib::IO->add_watch (fileno 'STDIN', [qw/in/], \&watch_callback, 'STDI
+N');    


$main_loop->run;
####################################################################

sub watch_callback {

    my ($fd, $condition, $fh) = @_;

        if(sysread(STDIN, my $buf, 1024)){ print "$buf\n" }
      
    #always return TRUE to continue the callback
    return 1;
}
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