#!/usr/bin/perl -wT

use strict;

$SIG{'PIPE'} = 'IGNORE';
$| = 1;

my $pid = open CONSUMER, '|-';
if (!defined $pid) {
    die "cannot fork: $!";
}
if (!$pid) {
    open STDOUT, '/dev/null';
    my $msg = <STDIN>;
    exit(0);
}
print CONSUMER "hi there\n" or die "cannot write to pipe: $!";
close CONSUMER
    or die $! ? "error closing pipe: $!" : "child exit status: $?";
print "done, satisfied\n";